JPH056635Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Prior Art Field] The present invention is an apparatus for recording an audio PCM signal on a magnetic tape using a rotating head on one diagonal track for each unit time, and for reproducing the same. In particular, the present invention relates to a magnetic recording and reproducing apparatus that is capable of reading subcode data recorded on a magnetic tape during tape loading or during a reproducing operation performed continuously.

[Technical background of the invention and its problems]

A helical scan type rotating head records audio signals on a magnetic tape by forming one diagonal track for each unit of time, and when reproducing this, the audio signals are converted into PCM and recorded. R-DAT (rotary head digital audio tape recorder) is used as a playback device.
The development of a magnetic recording and reproducing device called .

In this R-DAT, for example, two rotating heads are provided as shown in FIG.
Two rotating heads 1A and 1B are arranged on the rotating drum 3 with an angular spacing of 180°. On the other hand, the magnetic tape 2 is wound along the circumferential surface of the rotary drum 3 in an angular range of, for example, 90°. Then, the rotary drum 3 on which the rotary heads 1A and 1B are mounted is rotated at, for example, 2000 revolutions per minute, and the magnetic tape 2 is transported at a predetermined running speed.
A and 1B form one diagonal track on the magnetic tape 2 as shown in FIG. 3b, and a signal is recorded thereon.

In order to improve the recording density, the width directions of the gaps of the rotary heads 1A and 1B are arranged in different directions with respect to the direction orthogonal to the scanning direction. That is, the azimuth angles are different, and the rotary head 1
A and 1B are each provided with an azimuth angle of ±20°.

As shown in Figure 3b, the track format in this R-DAT is centered around PCM data, with ATF signal areas for tracking on both sides, and AUX data is recorded on both sides of the center. subcode area (SUB
-1, SUB-2) are provided. In addition, each signal has a PLL area for synchronization, and there is a gap between each signal so that each signal can be recorded independently. .

In the above-mentioned R-DAT, since the wrapping angle of the magnetic tape around the rotating drum is as small as 90°, the FF,
Search operation in the REW direction is possible, and the A-time recorded on the magnetic tape during this search
(Absolute-time) or R-time (Running-time)
By reading subcode data such as , high-speed access to any location is possible.

As a conventional device of this type, there is a structure shown in FIG.

In the figure, 4 is a mechanism block equipped with a rotating drum 3 on which heads 1A and 1B are mounted;
Reference numeral 5 indicates an operation unit for the user to select and operate the operation mode, 6 indicates a system control unit that controls the operation of the entire system, and 7 indicates PCM data from the reproduction signal from the RF amplifier 8 based on the control of the system control unit 6. A signal processing unit reads the PCM data and decodes the subcode data in the PCM data, and 9 is a display unit that displays the contents of the read subcode data.

Next, the data reading operation in the apparatus configured as described above will be explained based on the flowchart shown in FIG.

Based on the key input from the operating section 5, the system control section 6 controls the mechanism block 4 in step _S1 to start tape loading, and at the same time starts this tape loading, in step _S2. The drum motor is driven to rotate the rotary drum 3 on which the heads 1A and 1B are mounted. Thereafter, until the tape loading is completed, the signal processing unit 7, under the control of the system control unit 6, reproduces the data recorded on the magnetic tape 2 in step _S3 during tape loading. RF playback signal
Captured from amplifier 8, PCM from this playback signal
The data is read, the subcode data contained therein is decoded, and the content of the decoded subcode data is displayed on the display section 9.

Next, in step S4, the system control section 6 determines whether or not the tape loading in the mechanism block ₄ is completed, and if it is not completed, the operation in step _S3 described above is continued.
Further, when it is confirmed in step _S4 that tape loading is completed and a regular tape path is formed, the system control section 6 controls the mechanism block 4 to rotate the rotary drum 3 in step _S5 . The drum motor is stopped,
At step _S6 , the tape loading operation ends.

As mentioned above, conventional devices are configured to read the subcode data recorded on the magnetic tape during the period from the start of tape loading to the completion of tape loading. If the position of the rotating head after starting is near the boundary between two recording tracks formed on the magnetic tape, or if the surface of the magnetic tape in contact with the rotating head after tape loading starts is affected by dust, scratches, dropouts, etc. If the data on the magnetic tape cannot be read, the subcode data recorded on the magnetic tape cannot be read during tape loading, and the position on the magnetic tape cannot be known. A number of problems arose.

[Purpose of invention]

The present invention was developed to eliminate the above-mentioned conventional problems, and it is possible to correctly read subcode data recorded on a magnetic tape during the period from the start to the end of tape loading. If this is not possible, a magnetic recording/reproducing device is provided that can shift to a playback operation continuously with the tape loading operation and read the correct subcode data recorded on the magnetic tape during this playback operation. is intended to provide.

[Summary of the idea]

This invention consists of a signal processing section that reads data recorded on a magnetic tape under control from a system control section, extracts subcode data from it, and decodes its contents; an error detection unit that detects whether or not there is an error in the data read by the signal processing unit; and a system control unit that stores the data that is determined to be free of errors based on the output of the error detection unit. A memory and a display section for displaying the contents of the subcode data stored in the memory by a system control section are provided, and the subcode data recorded on the magnetic tape is correctly read by the end of the tape loading operation. If this is not possible, the correct subcode data recorded on the magnetic tape can be read by performing a reproducing operation in succession with the tape loading operation.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a block configuration diagram showing an embodiment of a magnetic recording/reproducing apparatus according to the present invention. Parts equivalent to those in the configuration shown in FIG. 4 are given the same reference numerals, and detailed explanation thereof will be omitted. . In addition to the configuration shown in FIG. 4, the present invention includes a timer 6A built into the system control section 6, an error detection section 7A that detects errors in data read by the signal processing section 7, A memory 10 is provided for storing stored data.

Next, the data reading operation according to the present invention will be explained based on the flowchart shown in FIG.

Based on the key input from the operating section 5, the system control section 6 controls the mechanism block 4 in step _S11 to start tape loading, and at the same time starts this tape loading, in step _S12. The drum motor is driven to rotate the rotary drum 3 on which the heads 1A and 1B are mounted. Thereafter, the signal processing unit 7
is controlled by the system control unit 6.
In S ₁₃ , the playback signal obtained by playing back the data recorded on the magnetic tape 2 during tape loading is read from the RF amplifier 8, and from this playback signal
Reads the PCM data and decodes the subcode data contained within it. Next, in step _S14 , the system control unit 6 determines whether tape loading in the mechanism block 4 is completed, and if it is not completed, the system control unit 6 executes the above-mentioned step S14.
The operation at _S13 continues. Also, step
If it is confirmed in _S14 that tape loading has been completed and a normal tape path has been formed, the system control unit 6 reads the output from the error detection unit 7A, and performs signal processing immediately before that in step _S15 . It is determined whether or not there is an error in the data on the magnetic tape read by the unit 7.

Then, in step _S15 , when it is determined that there is no error in the read data based on the output of the error detection section 7A, the system control section ₆ transfers the read data from the signal processing section 7 to the memory 10 in step S16. After the mechanism block 4 is stored, the process moves to step _S23 and the mechanism block 4 is brought into a stopped state.

If it is determined in step _S15 that there is an error in the data based on the output of the error detection section 7A, the system control section 6 proceeds to step _S17.
At this point, the mechanism block 4 is controlled so as to shift to the playback operation state successively with the tape loading operation. In this reproduction operation state, the signal processing section 7 transfers data recorded on the magnetic tape to the RF amplifier 8 under the control of the system control section 6.
Loading will start again via . Further, at the same time as the transition to the playback operation state in step _S17 , the system control unit 6 is activated in step _S18 .
The timer 6A provided at the timer 6A is cleared, and counting of a predetermined set time is started.

Then, in step _S19 , the signal processing section 7 reads the data recorded on the magnetic tape again. Every time data in this playback operation state is read by the signal processing unit 7, the system control unit 6 reads the output from the error detection unit 7A, and determines whether there is an error in the data on the read magnetic tape in step _S20 . It is determined whether or not.

In the above step _S20 , if it is determined that there is no error in the data based on the output of the error detection unit 7A read into the system control unit 6, the system control unit 6 stores the read data in the memory 10 in step _S16 . After the mechanism block 4 is stored, the process moves to step _S23 and the mechanism block 4 is brought into a stopped state.

Further, if the system control section 6 determines in step _S20 that there is an error in the data based only on the output of the error detection section 7A, then in step _S21 the system control section 6 starts the timer 6 provided in the system control section 6.
According to step A, it is determined in step _S17 whether or not the elapsed time since the start of the reproduction operation has exceeded a predetermined set time. If the above-mentioned set time has not yet been exceeded, the process returns to step _S19 and continues reading the data recorded on the magnetic tape repeatedly within the above-mentioned set time.

If it is determined in the above step _S21 that the above set time has been exceeded, the system control unit 6 proceeds to step _S22 in order to memorize that there is an error in the data read as a result. After setting an error flag in the area in memory 10,
In step _S23 , the mechanism block 4 is brought to a stopped state.

Even after the mechanism block 4 is in a stopped state, the subcode data stored in the memory 10 is read by the system control unit 6 and its contents are displayed on the display unit 9. You can know the location above.
It goes without saying that the reproducing operation that is performed continuously with the tape loading operation may be continued until correct data on the magnetic tape is read, without depending on the timer 6A.

〔effect〕

According to the present invention described above, at the end of a tape loading operation, it is determined whether or not there is an error in the data on the magnetic tape that was read immediately before,
If it is determined that there is an error, the playback operation is started in succession with the tape loading operation, and the data on the magnetic tape is read again.
The position on the magnetic tape after tape loading is finished without being affected by the position of the head and magnetic tape after tape loading has started, or the surface condition of the magnetic tape surface in contact with the head (dust, scratches, dropouts, etc.). You can read subcode data to know.

As a result, when sending data to display the position on the magnetic tape after tape loading is completed, or when searching for Absolute-time, Running-time, etc. immediately after tape loading is completed, the search The direction (high-speed running direction) can be determined instantly.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a magnetic recording and reproducing apparatus which is an embodiment of the present invention, FIG. 2 is a flowchart showing an example of the operating procedure of the present invention, and FIG. 3 is a R-
FIG. 4 is a block diagram showing a conventional example, and FIG. 5 is a flowchart showing the operation procedure of the conventional example. 1A, 1B... Rotating head, 2... Magnetic tape, 3... Rotating drum, 6... System control unit,
6A...Timer, 7...Signal processing unit, 7A...
Error detection unit, 9...Display unit, 10...Memory.

Claims (1)

[Claims for Utility Model Registration] (1) A rotary drum equipped with a head is driven to rotate at the same time as tape loading starts, and subcode data recorded on a magnetic tape is read during tape loading. In a magnetic recording/reproducing device, a signal processing section reads data recorded on a magnetic tape under the control of a system control section, extracts subcode data from the data, and decodes the contents; In some cases, an error detection section detects whether or not there is an error in the data read by the signal processing section immediately before, and the system control section detects whether or not there is an error in the data read by the signal processing section. The apparatus includes a memory for storing sub-code data, and a display section for displaying the contents of the sub-code data stored in the memory under the control of a system control section, and is capable of displaying the sub-code data by the end of the tape loading operation. If the tape cannot be read correctly, perform the playback operation in succession with the tape loading operation described above.
A magnetic recording/reproducing device characterized by being able to read correct subcode data. (2) The magnetic recording and reproducing apparatus according to claim 1, wherein the above-mentioned reproducing operation is performed within a predetermined time by a timer.