JPH03250443A - Auto reverse recording/playback device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a recording/reproducing apparatus using a recording medium having two types of running directions, such as a 5-DAT (Fixed/IJ) digital audio tape recorder. This relates to verse recording and playback methods.

2. Description of the Related Art] An auto-reverse function is very important in fixed head type recording and reproducing apparatuses having two running directions, such as compact cassettes and 5-DATs.

Conventional fixed-head recording/playback devices, such as compact cassettes, can record in two directions by changing the running direction when the user presses a reversing switch, or reversing when a leader tape is detected at the end of the tape. It allows playback.

Regarding 5-DAT, please refer to pages 159 to 16 of the "Digital Audio Dictionary" published by the Japan Audio Association.
It is explained on page 6.

However, the fixed head type recording/reproducing apparatus as described above has the following problems.

1. Since I don't know where the running direction was reversed when recording, I don't know where to reverse it the next time I play it back to reproduce the song order or the musical connections in the song at the time of recording.

2. When reversing the running direction during recording, recording will be interrupted for the period required for reversal, and the information input at that time will be lost, so silent sections or discontinuous points may occur during playback. Occurs.

In order to solve the above-mentioned conventional problems, the present applicant proposed in Japanese Patent Application No. 1-300486 a continuous record that indicates that a continuation is recorded on the reverse side when the running direction is reversed during audio data recording. A flag is recorded on the tape, and the next time it is played back, by detecting the continuous recording flag, it knows the point at which it should be reversed, and automatically reverses it, so that the tape, which has two running directions, runs in only one direction. In addition to being able to handle it as if it were playing a tape that is not
By using a memory, when a reversal occurs during recording, the audio data during the interruption of the recording operation can be stored, recorded after the reversal is completed, and the reproduced audio data can be sequentially stored in the memory during playback. , when a reversal occurs, the control data recording method and playback can be performed without interruption by reading out the audio data already stored in the memory instead of the data being played back from the tape. proposed a control method.

Problems to be Solved by the Invention However, the fixed head type recording and reproducing apparatus as described above has the following problems.

1. When reversing the running direction during recording, recording will be interrupted for the period required for reversing, so the audio data input at that time will be stored in memory, and after resuming recording, the stored audio data will be saved. is read out from memory, so if an inversion occurs, there will be a delay between the input audio data and the audio data read out from memory, and recording will occur after audio data input stops. There is a delay between when the tape finishes and when the tape stops.

2. If the running direction is reversed during playback, the playback operation will be interrupted during the period required for the reversal, so it is necessary to store the audio data to be output at that time in the memory in advance. Therefore, audio data cannot be output until the amount of audio data necessary for inversion is stored in the memory after playback is started. That is, it takes time from when a playback instruction is issued until the audio data is actually output.

The present invention solves the above conventional problems, and by increasing the tape speed and recording transfer rate, it reduces the memory delay that occurs when the running direction is reversed during recording. If the running direction of the tape is to be reversed during playback, the tape speed is increased immediately after the start of playback, and the recording transfer rate is increased so that the running direction of the tape can be immediately stopped. An object of the present invention is to provide an auto-reverse recording device and an auto-reverse playback device that can immediately output audio data at the start of playback by storing the same amount of audio data in a memory.

Furthermore, by recording the absolute position information of the reversal point, if the reversal point is close, playback will begin after sufficient input audio data has been stored, and if the reversal point is far, the tape speed will be increased immediately after playback starts and recording will begin. To provide an auto-reverse playback device that does not cause sound breakage during playback even when a reversal point is near by increasing the transfer rate and storing output audio data necessary for reversal. With the goal.

Means for Solving the Problems In order to achieve the above object, the IJ verse recording device of the present invention has a memory section for storing input data, an absolute address of each frame, and a recording end point where the main data is continuous with the back side. an auxiliary data generation unit that generates an absolute address of the frame, the data stored in the memory unit, the absolute address of each frame generated by the auxiliary data generation unit, and a recording end point where the main data is continuous with the back side. a recording unit that generates a recording signal based on the absolute address and records it on a recording medium;
A mechanism control unit that controls the running direction and tape speed of the tape, and a system control unit that controls the recording unit and the mechanism control unit, the system control unit comprising:
When reversing the running direction of the tape, reading of the input data from the memory section is stopped, and during recording, the tape speed and the memory of the recording section are adjusted based on the delay time of the input data by the memory section. The reading rate of input data from the unit is controlled.

Further, the auto-reverse playback device of the present invention includes a playback unit that reads a signal from a recording medium and plays back main data and auxiliary data, a memory unit that stores playback main data output from the playback unit, and a playback unit that stores the playback main data output from the playback unit. Extract the absolute address of the current position and the absolute address of the recording end point where the main data is continuous with the back side from the playback auxiliary data output from the The system control unit includes an address difference calculation unit that calculates a difference between absolute addresses, a mechanism control unit that controls a tape running direction and a tape speed, a system control unit that controls the playback unit, and the mechanism control unit. At the start of playback, the control unit controls the time between the start of playback of the playback section and the mechanism control section and the start of reading out the playback data from the memory section based on the difference in the addresses, and at the time of playback, the delay of the playback main data by the memory section. The tape speed and the output rate of the playback main data of the playback unit are controlled based on the time, and when the running direction of the tape is reversed, the writing of the playback main data to the memory unit is stopped. This is what I did.

Operation The auto-reverse recording device and the auto-reverse playback device of the present invention use the above-described method to store input data in the memory unit during the recording signal interruption period during reversal of the running direction during recording, and to adjust the tape speed and recording after the reversal is completed. By increasing the signal rate, the delay of the input data by the memory section is gradually reduced, allowing the tape speed to stop running immediately at the end of recording, and during playback, the tape speed and recording signal rate are increased. By doing so, the delay of the playback data caused by the memory section is gradually increased, and by making it possible to read the playback data from the memory section during the playback data interruption period during the reversal of the running direction, there is no interruption even during the reversal period. It is possible to output playback data without any need.

Furthermore, by recording the absolute position information of the reversal, if the reversal point is close, playback will begin after sufficient input audio data has been stored, and if the reversal point is far, the tape speed will be increased immediately after playback starts and the recording transfer rate will be increased. By increasing the amount of output audio data necessary for reversal, it is possible to prevent sound interruptions during playback even when the reversal point is close.

Embodiments Hereinafter, embodiments of an auto-reverse recording and reproducing apparatus having the functions of both an auto-reverse recording apparatus and an auto-reverse reproducing apparatus of the present invention will be described with reference to the drawings.

FIG. 4 is a control data layout diagram showing the recording results of control data and main data on the tape of the auto-reverse recording/reproducing apparatus according to the embodiment of the present invention.

In FIG. 4, a lead-in area is recorded for a certain period of time from the beginning of side A. The lead-in area is provided as a preliminary period from when the tape starts running until the running becomes stable, and a lead-in area ID (LI)=1 is recorded therein. Since the audio data at the start point of the program area on side A is not recorded consecutively to the audio data at the end point of the program area on side B, the continuous recording flag CF for the lead-in area on side A is set to "0". do.

Continuous recording flag CF is a flag indicating the continuity of audio data recorded in the lead-in area or lead-out area. If the audio data is continuous with the back side, "1 part is recorded, and the audio data is continuous with the back side. If not, “Opa” will be recorded. Thereafter, a program area for recording audio data is formed. Next, the lead-out area is recorded.

The lead-out area is an area indicating the end point of recording, and is recorded for a period long enough to be read even during high-speed search. Each area is a lead-in area I included in the auxiliary data.
It is identified by an area ID such as D (Ll) and lead-out area ID (LO). Note that since the audio data at the end point of side A is recorded so as to be continuous with the audio data at the start point of side B, the continuous recording flag OF in the lead-out area of side A is set to u I N. Immediately after recording the lead-out area, the running direction is reversed and the lead-in area is recorded. Note that the audio data at the start point of the program area on side B is recorded consecutively to the audio data at the end point of the program area on side A, so the continuous recording flag CF of the lead-in area on side B is recorded.
is "1".

The program area is then recorded. Next, form the lead-out area. Note that since the end point of side B is not recorded consecutively to the start point of side A, the continuous recording flag CF in the lead-out area of side B is set to "01".

Lead-in area B The relationship between the lead-in area ID (LI) and lead-out area ID (LO) in the program area and lead-out area is as follows.

Lead-in area: LI=1. LO=O, Program area: LI=O, LO=0° Lead-out area: LI=O, LO=1, Main data is valid audio data recorded only in the program area, and the lead-in area and lead-out area “0” is recorded in .

FIG. 1 is a block diagram showing the configuration of an auto-reverse recording/reproducing apparatus in an embodiment of the present invention.

In FIG. 1, 101 is a cassette that stores a magnetic tape, and 102 controls the running mode and running speed of the magnetic tape according to commands from the system control unit 105, and provides information on whether the magnetic tape has reached the end. A mechanism control unit 103 is a mechanism control unit that sends certain termination information END to a system control unit 105, and a recording/reproduction head that performs recording and reproduction on a magnetic tape.

The recording head is composed of nine heads, one head records auxiliary data including control data used for reproduction control, and the remaining eight heads record main data such as audio data. In addition, the playback head consists of nine heads,
One head reproduces auxiliary data including control data used for reproduction control, and the remaining eight heads reproduce main data such as audio data. In this embodiment, the magnetic tape is divided into two areas, upper and lower, one of which is used for recording in the forward direction and the other for recording in the reverse direction. To reverse the running direction, rotate the head 180 degrees.

FIG. 2 is a diagram showing a recording track pattern on a tape recorded by a recording head of an auto-reverse recording/reproducing apparatus according to an embodiment of the present invention.

Reference numeral 104 adds an error correction code to the main recording data RCDT supplied from the memory section 107 and the auxiliary data used for driving control etc. given from the system control section 105 and the auxiliary data generation section 108, modulates the data, and records/reproduces it as a recording signal. In addition to outputting to the head 103, the recording/reproducing head 1
This is a recording/reproducing unit that demodulates the reproduced signal reproduced from 03, performs error correction, outputs reproduced main data PBDT, extracts auxiliary data AUX, and sends it to the system control unit 105 and address difference calculation unit 109.

The transfer rate of the recording signal of the recording/reproducing section 104 is controlled by the system control section 105 . Control of the transfer rate of the recording signal can be easily achieved by increasing or decreasing the frequency of the master clock of the recording/reproducing section. Note that the auxiliary data includes control information such as a time code, program number, and area ID used for high-speed search, auto-reverse control, and the like.

105 instructs the mechanism control unit 102 about the running direction using a running direction control signal RDIR, and sends a recording/playback mode control signal RMODE to the recording/playback unit 104.
Indicates the operation mode such as recording mode and playback mode, and the recording transfer rate control data RATE
Controls the rate of the recording signal and sends the data to the memory unit 107.
Memory mode data MMO that specifies the memory operation mode
This is a system control unit that sends out DE. Reference numeral 106 denotes a recording/reproduction mode setting unit for the user to give commands to the system control unit 105. Recording/playback mode 1' settingg
106 sends mode information to the system control unit using system mode 5M0DE.

The user uses a recording/reproducing mode setting section 106, which is composed of a switch or the like, to instruct a general operation mode such as recording, reproduction, or repeated reproduction.

In this embodiment, the input/output of the auto-reverse recording/reproducing apparatus is audio data, but other data such as image data may be used, so auxiliary data used for control is generally referred to as main data.

Reference numeral 107 is a memory unit that stores input audio data IADT and reproduction main data PBDT.

Input audio data IADT is read out as recording main data RCDT, and reproduction main data PBDT is read out as output audio data 0ADT.

The memory 107 functions as a first-in, first-out ◆memory for each of input audio data and reproduction main data. That is, even if the transfer rate of audio data changes due to a stoppage of tape running, etc., as long as it is within the storage capacity of the memory, the audio data can be input and output without excess or deficiency. Further, the memory 107 sends delay information DELAY of memory input/output data to the system control unit 105.

108 is an auxiliary data generation unit that generates an absolute time code and an absolute time code at the recording end point.

Absolute time code is information that represents an absolute address on the tape.

Absolute time code is continuous time information from the beginning of the tape, and is recorded once per frame. Table 1 is a format diagram showing the recording format of auxiliary data.

In Figure 7, addresses O to 3 indicate absolute time codes, A-HOUR is the unit of time for the absolute time code, A-MINUTE is the minute unit for the absolute time code, and A-8ECOND is the unit for the absolute time code. The unit of second, A-FRAME, indicates the unit of frame of absolute time code.

Absolute time code is information that indicates the elapsed time from the beginning of the tape. A-HOUR takes a value from 0 to 99 in BCD, A-MINUTE takes a value from 0 to 59 in BCD, and A-8ECOND takes a value from 0 to 59 in BCD. A-FRAME takes values from 0 to 99 when 10 frames are generated per second, that is, when the frame frequency is 10 Hz. Absolute time code is recorded every frame, and A-FRAME is incremented by 1 every frame. Also, 5IDE of BIT7 of address 3 is A-HOU
R, A-MINUTE, A-8E COND, A-FRA
This is side identification data of the absolute time code represented by ME.

When S I DE = O, it shows the time code of side A, and 5
When IDE=1, it shows the time code of side B.

The data from address 4 to address 8 is information indicating the address of a program, etc., and plays the role of a table of contents for searching programs, etc., so it is called TQC (Table
of contents). Address 4 is data T that identifies which time code the following absolute time codes from address 5 to address 8 indicate.
It is OCID.

Program number 00 when TOCID=OO to 99
Indicates the absolute tights code at the beginning of the program from to 99, and when TOCID=AA (hexadecimal), CF=1
indicates the absolute address of the frame immediately after the lead-in area of , and indicates the absolute address of the frame immediately after the lead-in area of CF=O when TOCID=BB (hexadecimal),
When TOCID=CC (hexadecimal), it indicates the absolute address of the frame immediately before the lead-out area with CF=1, and T
When OCID=DD (hexadecimal), it indicates the absolute address of the frame immediately before the lead-out area with CF=0.

Addresses 5 to 8 indicate the absolute time code of the point indicated by address 4, TOC-HOUR is the time unit of the absolute time code, and TOC-M I NUTE
is the minute unit of absolute time code, TOC-8ECOND
TOC-FRAME indicates the absolute time code unit of seconds, and TOC-FRAME indicates the absolute time code frame unit. Also, 5IDE of BIT7 of address 8 is A-HOUR, A-M
This is side identification data of the absolute time code represented by INUTE, A-8ECOND, and A-FRAME.

When 5IDE=O, it shows the time code of side A, and 5I
When DE=1, time code on side B is ignored.

When the audio data is continuous from side A to side B, that is, when the continuous recording flag CF in the lead-out area of side A is "1," the absolute time code is from the start of side A to the end of recording on side B. When the continuous recording flag CF in the lead-out area of side A is “0” when the audio data is not continuous from side A to side B and the audio data is recorded continuously, from the start of side A to the recording end point of side A. , or recorded continuously from the start end of the B side to the recording end point of the B side.

The 9-byte auxiliary data mentioned above is recorded once per frame.

The auxiliary data generation unit 108 increments the frame number one frame at a time based on the absolute time code set from the system control 105, stores the TOC information set from the system control 105, and increments one type of TOC information for each frame. Output repeatedly.

109 calculates the difference DT between the absolute time code at the recording end point of the side currently being played and the absolute time code of the current frame based on the auxiliary data played back by the recording/playback unit 104, and the system control unit 105 This is an address difference calculation unit that sends out data to To determine whether the recording end point of the side currently being played is continuous with the back side, use the TOC of TOCI D=CC.
It can be determined by whether or not it exists. If there is a TOC with TOCI D=CC, it means that the recording end point of the side currently being played is continuous with the back side, and conversely, TOCI D=
If the TOC of the DD exists, it means that the recording end point of the side currently being played back is not continuous with the back side.

FIG. 3 is a block diagram showing an example of the configuration of the memory section 107.

In FIG. 3, the signal %IMODE is MMODE=O in the play mode and MMOD in the record mode.
E=1. 301 is memory mode data MMO
An input data selector 302 selects playback main data PBDT when DE=O and selects input audio data IADT when memory mode data MMODE=1, and 302 stores playback main data PBD T1 or input audio data IADT. RAM (random access memory).

Playback main data PBDT1 stored in memory 107
Alternatively, input audio data IADT is read out as output audio data OADT and recording main data RCDT, respectively. Reading and writing are performed alternately in the order of writing and reading. 3O3 is output audio data 0A when memory mode data MMODE=1
This is a mute circuit that mutes the DT. 304 is an address selector that alternately selects a write address and a read address. A subtracter 305 subtracts the write address from the read address and outputs delay information DELAY, which is data indicating a delay from writing to reading. When the delay information DELAY is O, the write address and read address are the same and the delay time is '
It is O゛. When the delay information DELAY is T, the difference between the write address and the read address is T, and the delay time is T.
becomes. 306 is a write address counter that generates a write address, and 307 is a read address counter that generates a read address. The write address counter 306 and the read address counter 307 are cleared by a memory reset signal MR8T supplied from the system control unit 105. 308 is a reproduction main data clock P BDT CK when memory mode data MMODE=O, that is, in reproduction mode.
, When memory mode data MMODE=1,
In other words, when in recording mode, the input audio clock IADTC
This is a write clock selector that selects K and supplies it to the write address counter 306.

309 is the output audio clock OA when memory mode data MMOD E = 0, that is, in the playback mode.
D T CK, memory mode fist data MMOD
This is a read clock selector that selects the recording main data clock RCDTCK and supplies it to the read address counter 307 when E=1, that is, in the recording mode. Note that the input audio clock IADTCK is a clock synchronized with the input audio data I ADT, the output audio clock 0ADTCK is a clock synchronized with the output audio data 0ADT, and the reproduced main data clock PBDTCK is a clock synchronized with the reproduced main data PBDT. , the recording main clock RCDTCK is the recording main data RC.
This is a clock synchronized with DT.

The operation of the memory section configured as above will be explained below.

The write address counter 306 and the read address counter 307 receive a memory reset signal M supplied from the system control unit 105 before starting a playback or recording operation.
It is cleared by R3T and becomes "0". When the memory mode data MMODE=O and the playback operation is started, the playback main data PBDT is written to the RAM 302 and at the same time, the output audio data 0ADT is read out. Reading and writing are performed alternately in the order of writing and reading. At this time, if the rates of the playback main data PBDT and the output audio data 0ADT are the same, the subtracter 305 outputs "0PA" and
If the rate of T is greater than the output audio data 0ADT, a positive value is output.

On the other hand, memory mode fist data MMODE=1,
When the recording operation is started after the write address counter 306 and read address counter 307 are cleared by the memory reset signal MR8T supplied from the system control unit 105, the input audio data IADT is
Record main data RC at the same time as being written to M302.
DT is read. Reading and writing are writing.

They are performed alternately in the order of reading. At this time, the subtractor 30
5 is input audio data IADT and recording main data RCD
If the rates of T are the same, "0" is output, and if the rate of input audio data IADT is thicker than the rate of recording main data RCDT, a positive value is output.

310 is a protection circuit that masks the read clock when the output of the subtracter 305 becomes "-1". The protection circuit 310 is provided to prevent the read address from overtaking the write address.

Next, the operation of the auto-reverse recording/reproducing apparatus according to the embodiment of the present invention configured as described above will be explained.

The characteristics of the IJ verse recording and reproducing apparatus according to the embodiment of the present invention are as follows.

(1) During recording, the input audio data that is input during the recording interruption period that occurs when reversing the running direction of the tape is stored in the memory unit 107, and the recording signal rate and tape speed are increased after the reversal is completed. The delay caused by the memory unit 107 is gradually reduced, and when the delay disappears, the tape speed is returned to a steady state.

If a command to stop recording is issued before the delay is over, the recording operation is stopped after all data stored in the memory unit 107 is read out.

(2) At the time of playback, as soon as playback starts, the tape speed is increased and playback main data is gradually stored in the memory section 107, so that the amount of data is sufficient to be output during the playback interruption period when the tape running direction is reversed. Once stored, the tape speed is returned to steady state. When reversing the running direction, data stored in the memory section 107 is read out.

Furthermore, by recording the absolute position information of the reversal, if the reversal point is close, playback will begin after sufficient input audio data has been stored, and if the reversal point is far, the tape speed will be increased immediately after playback starts, and the recording will be transferred. By increasing the rate, output audio data necessary for reversal is stored, thereby preventing sound breakage during playback even when the reversal point is close.

Next, the operation of the auto-reverse recording process of the auto-reverse recording/reproducing apparatus in the embodiment of the present invention will be explained.

FIG. 5 is a flowchart showing the operation of the auto-reverse recording/reproducing apparatus in the embodiment of the present invention. The auto-reverse recording and reproducing apparatus in the embodiment of the present invention is controlled by a system control section 105. Further, in this embodiment, it is assumed that the times of the audio data to be recorded on sides A and B are determined in advance, and the system control unit 105 has this information.

In FIG. 5, 500 indicates a memory reset process for resetting the address counter for the memory unit 107. The write address and read address become the same due to memory reset processing, and the delay information DELAY
becomes “O”.

501 indicates processing for instructing the recording/reproducing unit 104 to record four frames in the red-in area from the beginning of side A. Note that a frame represents the smallest unit that can be recorded independently on a tape. 502 indicates a process of setting an absolute time code of O hours, O minutes, O seconds, and 0 frames to the auxiliary data generation unit 108, and setting the following four types of TOC.

(1) TOCID=BB, 5IDE = 0°0 hours 0 minutes 0 seconds 0 frames (2) TOCID=CC, 5IDE = 0°0 hours 40 minutes 59 seconds 9 frames (3) TOCID=AA, 5IDE = 1°0 Hours 41 minutes O seconds O frame (4) TOCID = DD, 5IDE = 1° 0:70 minutes 59 seconds 9 frames 503 writes input audio data to the memory section 107, reads out the recording main data, and writes the audio data. The process of instructing the start of recording is shown. If the absolute time code of the frame currently being played is the last frame TAEND of the program area on side A, the process branches to step 504, and if the absolute time code of the frame currently being played is the last frame TAEND of the program area on side A, the absolute time code of the frame currently being played is the last frame TAEND of the program area on side A. If the frame TAEND is not the frame TAEND, the process branches to process 503. The absolute time of the last frame TAEND of the program area on side A is 0:40:59.9 from the TOC of TOCID=CG.
It becomes a frame. The absolute time code of the currently playing frame is the last frame TAE of the program area on side A.
The processes from 505 to 509 that are executed in the case of ND are processes for reversing the running direction.During this time, writing of the input audio data IADT to the memory unit 107 continues; The reading of the recording main data RCDT from the recording main data RCDT is stopped, and the output of the recording signal is also stopped. In other words, input audio data IADT is stored in memory section 1.
It is stored in 07. 505 outputs a recording signal to the recording/reproducing section 104 and outputs recording main data RC from the memory section 107.
The process of instructing to stop reading DT is shown. 506 indicates processing for instructing the recording/reproducing unit 104 to record four frames in the lead-out area with continuous recording flag CF=1.

507 indicates processing for instructing the mechanism control unit 102 to reverse the tape running direction. 508 indicates processing for instructing the recording/reproducing unit 104 to record four frames in the lead-in area where the continuous recording flag CF=1. 509 instructs the recording/reproducing unit 104 to increase the recording signal rate by 1%, and the mechanism control unit to increase the tape speed by 1%.
This shows the process of instructing to increase the percentage. Note that when the recording signal rate increases by 1%, the reading rate of the recording main data RCDT from the memory unit 107 also increases by 1%. 518
shows the process of setting 0:41900 seconds 0 frame, which is one frame added to the absolute time of the last frame TABND of the program area on side A, as the initial value of the absolute time code.

Furthermore, in step 518, the same data as the TOC set in step 502 is set again. That is, the same TOC data is repeatedly recorded on side A and side B. 510 causes the recording/reproducing unit 104 to start recording audio data and the memory unit 107
This shows the process of instructing the start of reading data from. 5
11, if the absolute time code of the frame currently being played is the last frame TBEND of the program area of side B, the process branches to process 512, and if the absolute time code of the frame currently being played is the last frame TBEND of the program area of side B If the frame TBEND is not the frame TBEND, the process branches to process 516. Absolute time of the last frame TBEND of the program area on side B, ToCID = TO of DD
It becomes 0:70:59.9 frames from C. 512 indicates processing for instructing the memory unit 107 to stop writing the input audio data IADT. When the delay information 513 sent from the memory unit 107 is DELAY=0, that is, when all the written input audio data has been read out, the process branches to process 514 to write the lead-out area and end the recording.

When the memory delay information DELAY is a positive value, that is,
This shows the process of repeating process 513 when the written input audio data still remains. During this time, although writing of input audio data has already been completed, reading of recorded data continues.

514 indicates processing for instructing the recording/reproducing unit 104 to record four frames in the lead-out area. 51
5 shows a process of instructing the recording/reproducing unit 104 to stop recording and instructing the mechanism control unit 102 to stop tape running. That is, in process 513, when the delay of the memory unit 107 becomes 0, the lead-out area is recorded and then the recording is ended. On the other hand, a process 516 that is executed when an instruction to stop recording is not received from the recording/playback mode setting unit 106 in the process 511 executes the process 511 again when the delay information DELAY sent from the memory unit 107 is positive. When the delay information DELAY is “O”, that is, input audio data I ADT and recording main data RC
The process branches to process 517 when the DT delay is no longer present. 517 indicates processing for instructing the recording/reproducing unit 104 to return the recording signal rate to the standard value, and instructing the mechanism control unit 102 to return the tape speed to the standard value. - Once the process branches to process 517, the delay information DELAY remains at "0" and does not change, so recording of audio data continues until a stop instruction is received in process 511.

Next, the operation of the IJ verse reproduction process of the auto-reverse recording and reproduction apparatus in the embodiment of the present invention will be described.

In the auto-reverse playback process of the auto-reverse recording/playback device according to the embodiment of the present invention, extra playback main data is stored in the memory unit 107 in advance in order to avoid the interruption of output audio data that occurs during the playback interruption period when the running direction is reversed. Try to save it. However, if you try to store playback main data equivalent to the playback interruption period at the start of playback, it will not be possible to output the output audio data immediately after playback starts, so if the time until the reversal point is long enough, the tape speed By increasing the value by 1%, the playback main data is gradually accumulated. On the other hand, if the time up to the reversal point is short, even if the tape speed is increased by 1%, it will not be possible to store the main playback data equivalent to the playback interruption period until the reversal point, so a certain amount of data will be stored at the start of playback. is stored before outputting the output audio data.

The maximum value of the amount of playback main data corresponding to the playback interruption period is DMAX bytes, the transfer rate of the playback main data at standard tape speed is PTR (7 seconds bytes), and the address difference calculated by the address difference calculation unit 109, i.e. Assuming that the time from the playback start point to the reversal point is DT (seconds), when equation (1) holds, there is no need to store playback main data at the start of playback.

DT*PTR*0.01≧DMAX...(1)
Conversely, if equation (1) does not hold, SD satisfies equation (2).
It is necessary to store bytes of playback main data at the start of playback.

SD=DMAX-DT*TR*0.01-(2)SD/
When ST is the value of f times converted into tape running time, ST is expressed by equation (3).

ST=DMAX/PTR-DT*0.01...
(3) In other words, it is necessary to start reading out the output audio data 81 seconds after starting playback and writing the playback main data into the memory unit 107.

FIG. 6 is a flowchart showing the operation of the auto-reverse playback process of the auto-reverse recording/playback apparatus in the embodiment of the present invention. The auto-reverse recording and reproducing apparatus in the embodiment of the present invention is controlled by a system control section 105.

In FIG. 6, reference numeral 601 indicates memory reset processing for resetting the address counter for the memory unit 107. The write address and read address become the same due to memory reset processing, and the delay information DELAY
becomes “O”. 602 indicates processing for instructing the mechanism control unit 102 to start the playback mode. In this example,
Let's start by playing side A. 603 is processing 6 if the frame currently being played is the lead-in area.
03 is executed again, and if the frame currently being played is not in the lead-in area, the process branches to process 604. 604 indicates a process that branches to process 615 if the frame currently being played is in the program area of side A, and branches to process 617 if the frame currently being played is not in the program area of side A. 617 indicates a process that branches to process 607 if the frame currently being reproduced is an 8-sided program area, and branches to process 609 if the frame currently being reproduced is not an 8-sided program area. That is, by processing 603, 604, and 617, if the frame currently being played is in the lead-in area, processing 603 is repeated and the frame currently being played is A.
If the frame is the program area for side 8, the process branches to process 615. If the frame currently being played is the program area for side 8, the process branches to process 607. If the frame currently being played is the lead-out area, the process branches to process 607. The process branches to process 609. Note that the area currently being reproduced is determined by looking at the area ID in the auxiliary data reproduced by the recording/reproducing section 104. Also, the determination of the A side and the 8th side is made by the mechanism control unit 102.
Judgment is made based on the direction of travel indicated.

615 indicates a process that branches to process 605 when the above-mentioned formula (1) is satisfied, and branches to process 616 when the above-mentioned formula (1) is not satisfied.

When formula (1) is transformed, it becomes formula (4).

DT≧DMAX/ (PTR*0.01) ...(
4) Here, if we set LT=DMAX/ (PTR*0.01), (
5) Equation is derived.

DT≧LT...(5
) (1) and (5) are equivalent.

605 is a memory delay time predetermined value D
When DMAX is reached, the process branches to process 608, and when the memory delay is less than DMAX, the process branches to process 606. The delay time DMAX is the maximum value of the time during which the regeneration process is interrupted when the traveling direction is reversed. In addition, the delay time D
The value of MAX needs to be smaller than the capacity of RAM 302. 606 indicates processing for instructing the mechanism control unit 102 to increase the tape speed by 1% from the standard value. 607 indicates processing for instructing the recording/reproducing unit 104 to write the reproduction main data PBDT and read the output audio data 0ADT.

To summarize processes 605 to 607, after starting playback in the program area of side A, the memory unit 107 takes in extra playback main data for DMAX seconds, that is, the delay time of playback main data by the memory is DM
Until AX seconds are reached, the tape speed is set 1% higher than the standard value, the write rate of the playback main data is set higher than the read rate of the output audio data, and the delay is gradually increased. This is to store DMAX seconds worth of audio data until the reversal occurs in order to continue outputting the output audio data 0ADT even during the non-reproducible period when the tape running direction is reversed.

608 indicates processing for instructing the mechanism control unit 102 to return the tape speed to the standard value. That is, when a sufficient amount of playback main data to be read during inversion is stored, the tape speed is returned to the standard value to make the write and read rates to the memory the same.

Reference numeral 609 indicates processing for instructing the recording/reproducing unit 104 to stop writing reproduction main data to the memory. Process 609 is executed when the frame currently being played is neither the lead-in area nor the program area, that is, when it is the lead-out area. Process 610 indicates a process that branches to process 611 when the continuous recording flag CF=1 reproduced by the recording/reproducing unit 104, and branches to process 612 when the continuous recording flag CF=0.

612 is delay information DEL sent from the memory unit 107
When AY=O, it branches to process 613 and stores memory delay information D.
The process of repeating process 612 when ELAY is a positive value is shown. Process 613 indicates processing for instructing the memory unit 107 to prohibit reading of the output audio data 0ADT. 614 indicates processing for instructing the mechanism control unit 102 to stop tape running.

Processes 612 to 614 are executed when the lead-out area with continuous recording flag CF=0 is reproduced. Processing 61
To summarize the steps 2 to 614, playback ends after all data stored in the memory unit 107 is read out.

On the other hand, eii indicates processing for instructing the mechanism control unit 102 to reverse the tape running direction. Thereafter, the process branches to process 603, and after reproducing the lead-in area, the program area is reproduced. From processing 609 to processing 606, the output of the playback main data is stopped, so the memory section 1
Output the playback main data stored in 07 as audio data 0
Output as ADT.

Through the procedure described above, the auto-reverse recording/reproducing apparatus according to the embodiment of the present invention increases the tape speed and increases the delay until the delay in the memory unit 107 becomes DMAX or more, and the continuous recording flag CF= When the lead-out area 1 is detected, it is immediately reversed, and the output audio data during that time is continued to be output based on the playback main data stored in the memory section 107 in advance, thereby preventing sound breakage during reversal.

Furthermore, if the running time from the playback start point to the tape running direction reversal point is short, enough data is stored in the memory after playback starts to be output during the playback interruption period during which the tape running direction is reversed. By not outputting the output audio data until the reversal is performed, it is possible to prevent sound interruptions during reversal.

Effects of the Invention As is clear from the above explanation, the auto-reverse recording device of the present invention has a memory section for storing input data, an absolute address of each frame, and an absolute address of the recording end point where the main data is continuous with the back side. an auxiliary data generation unit that generates;
Generating a recording signal based on the data stored in the memory unit, the absolute address of each frame generated by the auxiliary data generation unit, and the absolute address of a recording end point where the main data is continuous with the back side, A recording unit that records on a recording medium, a mechanism control unit that controls the running direction and tape speed of the tape, and a system control unit that controls the recording unit and the mechanism control unit, and the system control unit controls the running direction of the tape and the mechanism control unit. When reversing the direction, reading of the input data from the memory section is stopped, and when recording, the tape speed and the input from the memory section of the recording section are adjusted based on the delay time of the input data by the memory section. By controlling the data read rate, the input data during the recording signal interruption period during the reversal of the running direction is stored in a memory section, and the tape speed and the recording signal rate are increased after the reversal is completed. By gradually reducing the delay of input data caused by the memory section, tape speed running can be stopped immediately upon completion of recording.

The auto-reverse playback device of the present invention also includes a playback unit that reads a signal from a recording medium and plays back main data and auxiliary data, a memory unit that stores the playback main data output from the playback unit, and a memory unit that stores the playback main data. The absolute address of the current position and the absolute address of the recording end point where the main data is continuous with the back side are extracted from the playback auxiliary data output from the unit, and the absolute address of the current position and the end of recording where the main data is continuous with the back side are extracted. The system comprises: an address difference calculation unit that calculates a difference between absolute addresses of points; a mechanism control unit that controls a tape running direction and tape speed; a system control unit that controls the playback unit and the mechanism control unit; The control section controls the time between the start of playback of the playback section and the mechanism control section and the start of reading out the playback data from the memory section based on the difference in the addresses at the time of playback, and controls the time between the start of playback of the playback section and the mechanism control section and the start of reading out the playback data from the memory section. The tape speed and the output rate of the playback main data of the playback unit are controlled based on the delay time of the playback main data, and when the tape running direction is reversed, writing of the playback main data to the memory unit is stopped. By increasing the tape speed and recording signal rate, the delay of the playback data caused by the memory section is gradually increased, and the delay during the playback data interruption period during the reversal of the running direction is controlled. By allowing the reproduced data to be read from the memory section, the reproduced data can be output without interruption even during the inversion period.

Furthermore, the absolute address, which is the absolute position information of the reversal,
By reproducing the absolute address of the reversal point,
Calculate the time from the current position to the reversal point, and if the reversal point is close, playback will begin after enough input audio data has been stored, and if the reversal point is far, the tape speed will be increased immediately after playback starts, and the recording will start. By increasing the transfer rate and storing output audio data necessary for reversal, it is possible to prevent sound interruptions during playback even when the reversal point is close.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a recording and reproducing device for realizing an auto-reverse recording and reproducing device in an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of an autoreverse recording and reproducing device in an embodiment of the present invention.
FIG. 3 is a block diagram showing an example of the configuration of the memory section 107, and FIG. 4 is a diagram showing the recording track pattern on the tape recorded by the recording head of the birth recording/reproducing device. A control data layout diagram showing the control data on the tape and the recording result of main data when continuous recording on both sides is performed in the berth recording/reproducing device;
FIG. 5 is a flowchart showing the operation of the auto-reverse recording process of the auto-reverse recording and reproducing apparatus in the embodiment of the present invention, and FIG. Flowchart shown: 101...Cassette, 102.
... Mechanism control section, 103... Recording/playback head, 104... Recording/playback section, 105... System control section, 106... Recording/playback mode setting section, 107... Memory section, 108... - Auxiliary data generation section, 109...address difference calculation section.

Claims (4)

[Claims] (1) An auxiliary data generation unit that generates the absolute address of each frame and the absolute address of the recording end point where the main data is continuous with the back side, input data, and the absolute address of each frame generated by the auxiliary data generation unit. Based on the absolute address of the recording end point where the main data is continuous with the back side,
An auto-reverse recording device comprising: a recording section that generates a recording signal and records it on a recording medium. (2) A memory section that stores input data, an auxiliary data generation section that generates the absolute address of each frame and the absolute address of the recording end point where the main data is continuous with the back side, and the data stored in the memory section. , a recording unit that generates a recording signal and records it on a recording medium based on the absolute address of each frame generated by the auxiliary data generation unit and the absolute address of a recording end point where the main data is continuous with the back side; , a mechanism control unit that controls the running direction of the tape and the tape speed, and a system control unit that controls the recording unit and the mechanism control unit, and the system control unit, when reversing the running direction of the tape, The reading of the input data from the memory section is stopped, and during recording, the tape speed and the reading rate of the input data from the memory section of the recording section are adjusted based on the delay time of the input data by the memory section. An auto-reverse recording device characterized by controlling. (3) a playback unit that reads signals from a recording medium and plays back main data and auxiliary data; a memory unit that stores playback main data output from the playback unit; and a playback auxiliary data output from the playback unit. Address difference that extracts the absolute address of the current position and the absolute address of the recording end point where the main data is continuous with the back side, and calculates the difference between the absolute address of the current position and the absolute address of the recording end point where the main data is continuous with the back side. a calculation section; a mechanism control section that controls the running direction and tape speed of the tape; a system control section that controls the playback section and the mechanism control section; Based on the difference, the time from the start of playback of the playback unit and mechanism control unit to the start of reading out the playback data from the memory unit is controlled, and during playback, the time is controlled based on the delay time of the playback main data by the memory unit. , the tape speed and the output rate of the reproduction main data of the reproduction section are controlled, and when the running direction of the tape is reversed, the writing of the reproduction main data to the memory section is controlled to be stopped. Auto reverse playback device. (4) An auto-reverse recording and reproducing apparatus characterized in that the memory section in the auto-reverse recording apparatus according to claim 2 and the memory section in the auto-reverse reproducing apparatus according to claim 3 are constituted by the same memory section.