JPH06333371A - Magnetic recording and reproducing device - Google Patents

Abstract

(57) [Abstract] [Purpose] The optimum REC standby tape position to wait until the start of the next recording is determined by the last frame address information at the end of recording, and the time from the tape running to the start of recording. The aim is to minimize. A cylinder motor driving means for driving a rotary magnetic head, a capstan motor driving circuit 522 for starting and stopping a capstan motor 525, which is a tape driving motor, and each frame address included in an information signal during reproduction. A magnetic recording / reproducing apparatus comprising: a reproduction frame number detecting means for detecting a recording position; and an arithmetic processing means for determining a tape position to wait until the next recording is started based on the final frame address information at the end of recording.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to recording such as joint photographing and insert.

[0002]

2. Description of the Related Art A servo mechanism of a conventional magnetic recording / reproducing apparatus (hereinafter referred to as VTR) will be described. Figure 5 shows the conventional V
FIG. 6 is a block diagram showing the configuration of a servo mechanism during TR reproduction. A cylinder motor 502 that drives the rotary head 503, a first frequency generator 505 that detects the rotation speed of the cylinder motor 502, and a cylinder motor 502.
Cylinder FG signal 52 which is the output signal of the phase detector 504 for detecting the rotational phase of the first frequency generator 505
8, a first frequency discriminator 507 for detecting an error with respect to a reference cycle, a reference signal generator 511, and a phase detector 50.
4 and the output signal 528 of the first frequency generator 505, the head switching signal 527 (H
SW signal) and a reproduction reference signal 536 obtained by the reference signal generator 511, a first phase comparator 510 for detecting a phase error, a phase error output 529 of the first phase comparator 510, and a first frequency. Speed error output 5 of the discriminator 507
30, a first adder 509 which mixes with 30, a first drive circuit 506 which drives the first amplifier 508 and the cylinder motor 502, a capstan motor 525 which runs the magnetic tape 501 at a constant speed, and its capstan. Motor 525
Second frequency generator 524 that detects the rotational speed of the second frequency generator, and a second frequency detector that detects an error of the output signal of the second frequency generator 524 from the capstan FG signal 531 with respect to the reference period.
Frequency discriminator 523, a circuit 513 for creating a tracking error signal 534 used for tracking control of the capstan motor from the pilot signal recorded on the magnetic tape 501, the tracking error signal and the terminal 5
The second phase detector 519 for detecting the rotational phase of the capstan motor by comparing 1/2 Vcc obtained from 18 and the phase error output 532 of the second phase comparator 519 and the second
Second adder 520 that mixes with the speed error output 533 of the frequency discriminator 523, and the second drive circuit 522 that drives the second amplifier 521 and the capstan motor 525.
And signal 5 to start or stop the capstan motor
35 (CAP_ON signal) and a signal 537 (CAP_R / F signal) for determining the rotation direction of the capstan motor,
It is composed of arithmetic processing means (hereinafter referred to as a microcomputer) that outputs the signals 535 and 537 from the information from the terminal 516.

Next, a conventional VTR joint photographing method will be described with reference to FIGS. 4 and 5. The horizontal axis of FIG. 4 represents the running direction of the tape, and the vertical axis represents the time direction. During recording, information indicating the address of each frame is output from the microcomputer 517 to the modulation circuit 539, and is recorded on the tape 501 from the rotary magnetic head 503 through the REC amplifier 538. REC STOP KEY is pressed during recording and terminal 5
When a SHORT REW MODE command is input to the microcomputer 517 from 16, the recording is stopped, and the information indicating the address of the frame at that time is stored in the RAM of the microcomputer 517. Next, reverse the capstan motor, run the tape in the opposite direction to some extent,
Stop the capstan motor and start the next REC STA
RTKEY is pressed and SHORT PLA from terminal 516
It is in a standby state until the Y MODE command is input to the microcomputer 517. Then REC START
KEY is pressed and SHORT PLAY from terminal 516
When the MODE command is input to the microcomputer 517, the tape is reproduced and the tracking error signal is used to control the phase of the capstan. When the phase pull-in is completed, information indicating the address of each frame is sent from the rotary magnetic head 503 to the demodulation circuit 5 through the head amplifier 514.
It is extracted at 15 and input to the microcomputer 517. When the information indicating the address of the currently running frame input to the microcomputer 517 and the information indicating the address of the frame stored at the end of the previous recording match, an information signal is recorded on the tape to complete the joint photographing. To do.

[0004]

However, in the above-mentioned conventional method, the time required from the pressing of the REC START KEY until the completion of the servo phase pull-in varies greatly depending on the type and variation of the motor and mechanism. The tape return amount was determined with a margin so that it would not exceed the tape position at which recording was stopped. Therefore, there is a drawback that it takes a long time from when the REC START KEY is pressed until recording is started.

[0005]

In order to solve the above problems, in a magnetic recording / reproducing apparatus of the present invention, a cylinder motor driving means for driving a rotary magnetic head and a capstan motor as a tape driving motor are provided. Capstan motor start / stop means for starting / stopping, playback frame number detection means for detecting a frame address included in the information signal at the time of playback, and tape waiting for the next recording start by the last frame address information at the end of recording It is provided with arithmetic processing means for determining the position.

[0006]

According to the present invention, the capstan motor can be stopped at the optimum recording standby tape position by the above-mentioned configuration, and the time from the tape running at the start of recording to the start of recording can be reduced. Can be the shortest.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a specific embodiment of the present invention. In the figure, the block denoted by 101 has the same function as the configuration of the servo mechanism of the conventional VTR.

Next, the basic concept of the joint photographing method of the present invention will be described with reference to FIG. The horizontal axis of FIG. 3 represents the running direction of the tape, and the vertical axis represents the time direction. During recording, information indicating the address of each frame is output from the microcomputer 517 to the modulation circuit 539, and the REC
Recording is performed on the tape 501 from the rotary magnetic head 503 through the amplifier 538. REC STOP KE during recording
Y is pressed and SHORT REW MOD from terminal 516
When E is input to the microcomputer, recording is interrupted, and information indicating the address of the frame at that time is sent to the microcomputer 5
It is stored in the RAM of 17 and placed. Next, the capstan motor 525 is rotated in the reverse direction, the tape is run in the reverse direction to some extent, and the capstan motor 525 is stopped. Next, the capstan 525 is rotated in the normal direction, the tape is reproduced, and the phase of the capstan is controlled using the tracking error signal. When the phase pull-in is completed, the information indicating the address of each frame is transferred from the rotary magnetic head 503 to the head amplifier 5.
It is extracted by the demodulation circuit 515 through 14 and input to the microcomputer 517. When the information indicating the frame number several frames before the frame address stored at the end of the previous recording is input to the microcomputer 517, the capstan motor 525 is stopped and the next REC is performed.
It is in a standby state until START KEY is pressed.
Next, when REC START KEY is pressed and SHORT PLAY MODE is input to the microcomputer from the terminal 516, the tape is reproduced and the phase of the capstan is controlled using the tracking error signal. When the phase pull-in is completed, the information indicating the address of each frame is extracted from the rotary magnetic head 503 through the head amplifier 514 by the demodulation circuit 515 and input to the microcomputer 517. When the information indicating the address of the currently running frame input to the microcomputer 517 and the information indicating the address of the frame stored at the end of the previous recording match, the information signal is started to be recorded on the tape and the joint recording is performed. Is completed.

Next, the software processing of the microcomputer 517 will be described with reference to FIG. After the power is turned on, the main process shown in FIG. 2 is performed. A process 201 is a process for performing initial setting, and includes RAM RATC, RAT
This is a process of clearing CF. Process 20 after process 201
Go to 2. The process 202 is a determination process, and the terminal 561
Is a process for determining whether or not the information from is in the mode of SHORT REW MODE. SHORT RE
If it is the W MODE mode, the process proceeds to step 203, and if not, the process proceeds to step 204. The process 203 is performed by the demodulation circuit 515.
This is a process of storing in the RAM RATC the information indicating the address of the frame extracted in step S4 and input to the microcomputer 517. In FIG. 2, the information indicating the address of the frame is represented by α. The process 204 is a determination process, and the terminal 516
Is a process for determining whether or not the information from is a SHORT FF MODE. If it is SHORT FF MODE, the process proceeds to step 205, and otherwise proceeds to process 202. Process 205 is a process for causing the drive circuit 522 of the capstan motor to display information in the forward direction. In step 206, the information indicating the address of the frame extracted by the demodulation circuit 515 and input to the microcomputer 517 is stored in the RAM RATCF.
Is a process of storing in. In FIG. 2, information indicating the address of the frame is represented by β. Process 207 is a determination process,
This is a process for determining whether or not the value obtained by subtracting the contents of RAM RATCF from the contents of RAM RATC is γ.
If γ, the process proceeds to step 208, and otherwise proceeds to process 209. Process 208 is the drive circuit 52 of the capstan motor.
This is a process of informing 2 of the capstan stop command. Process 209 is a process of notifying the drive circuit 522 of the capstan motor of the capstan activation command.

The above is the software processing performed by the microcomputer 517. In this example,
Although we explained the joint shot, it is obvious that it can be applied to the insert. Further, α and β in FIG. 2 are values that change for each frame number indicating each frame number of the tape. Also, it is obvious that γ may be changed to an optimum value depending on the mechanism and the type of motor.

[0011]

According to the present invention, with the above configuration, the capstan motor can be stopped at the optimum recording standby tape position, and the time from the tape running at the start of recording to the start of recording. Can be the shortest.

[Brief description of drawings]

FIG. 1 is a block diagram of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart of a main processing program of a microcomputer applied to the present invention.

FIG. 3 is a schematic diagram showing the state of tape transfer during joint shooting used in the present invention.

FIG. 4 is a schematic diagram showing a state of tape transfer during conventional joint shooting.

FIG. 5 is a block diagram of a main part of a servo mechanism during reproduction of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 501 magnetic tape 502 cylinder motor 503 magnetic head 504 rotation phase detector 505 frequency generator 506 cylinder motor drive circuit 507 frequency discriminator 508 amplification circuit 509 adder 510 phase comparator 511 reference signal generator 512 HSW signal generator 513 tracking error Signal generator 514 Head amplifier 515 Demodulation circuit 517 Microcomputer 519 Phase comparator 520 Adder 521 Amplification circuit 522 Capstan motor drive circuit 523 Frequency discriminator 524 Frequency generator 525 Capstan motor 538 REC amplifier 539 Modulation circuit

Claims (1)

[Claims] 1. A recording means for recording the information signal, which is information signal of one or a plurality of frames recorded on a plurality of tracks, and which includes information indicating an address of each frame, with a rotary magnetic head obliquely recording the tape. Reproducing means for reproducing the information signal recorded on the tape, tape driving means for moving the tape in its longitudinal direction, driving means for a cylinder motor equipped with the rotary magnetic head, and tape driving means. The capstan motor start / stop means for starting / stopping the capstan motor which is the motor, the reproduction frame number detection means for detecting each frame address included in the information signal at the time of reproduction, and the address of the last frame at the end of recording. A magnetic recording device characterized by including arithmetic processing means for determining the tape position to wait until the start of the next recording according to the information. Recording / playback device.