JP2671536B2 - Digital data recording / reproducing device - Google Patents

Description

The present invention relates to a digital data recording / reproducing apparatus, and more particularly to a digital audio tape recorder and a PCM audio V recorder.
The present invention relates to a digital data recording / reproducing device most suitable for TR.

[Prior Art] A conventional normal VTR is not designed to record a program number. Therefore, the search by the program number cannot be performed.

In addition, in the conventional PCM audio VTR, TOC (Table Of Co
ntents) data is to be recorded from the tape start point to the tape end point. Therefore, like a commercially available soft tape, the program to be recorded and its recording position are predetermined, and it is convenient when the program is once recorded and hardly changed thereafter, but it is convenient for general users to use. As in the case of tapes, it is unknown what program is recorded at which position until the actual recording is started.
When a new program is sequentially recorded, it becomes practically impossible to record the same TOC data over the entire magnetic tape.

Moreover, even if the absolute time of the program at the starting point is known, the magnetic tape is transferred at a high speed during the search, so the ID code cannot be read, and the absolute time cannot be detected.

In this respect, the conventional digital audio tape recorder can read the ID code even during the search, so it is possible to detect the absolute time.
Since the data is recorded only at the tape start point, TOC
In order to record or reproduce data, it is necessary to rewind to the tape starting point.

[Problems to be Solved by the Invention] As described above, in the conventional apparatus, it was substantially difficult or extremely inconvenient for the general user to record the TOC data. Therefore, it was almost impossible to reproduce the TOC data and search for a desired program at high speed.

The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to easily record TOC data with a consumer VTR and use the TOC data during reproduction.

[Means for Solving the Problem] In order to achieve this object, a digital data recording / reproducing apparatus of the present invention includes an absolute time indicating an absolute time from a start point of a recording medium, a program number corresponding to each program, When an instruction to record the latest digital data is given to a digital data recording / reproducing apparatus that records / reproduces an ID code including at least TOC data indicating information of each program in absolute time and predetermined digital data on a recording medium. , First means for reading the absolute time and program number already recorded on the recording medium before starting the recording,
The second means for calculating a new absolute time and a new program number so as to be continuous with the absolute time and the program number read by the first means, and the absolute time and the program number calculated by the second means for the TOC Absolute time, program number, and TOC, the third means of recording on the recording medium together with the data and the latest digital data
An ID code including at least data is set from a recording medium sequentially recorded together with digital data of the latest program, when a command to search for a program having a predetermined program number is issued, a reproduction mode is set for a predetermined period, A fourth means for reproducing the absolute time, the program number and the TOC data from the reproduction signal of the recording medium, and the recording medium when the program number to be searched is larger than the program number read by the fourth means. Is repeated for a predetermined period of time to repeat the operation of causing the fourth means to read at least the program number. When the program number to be searched is smaller than the program number read by the fourth means, the recording medium is rewound, When rewinding, the recording medium is During rewinding by subtracting the absolute time read by the fourth means by the fifth means for detecting the recorded control pulse and the value corresponding to the number of control pulses detected by the fifth means. And a sixth means for calculating the absolute time of the recording medium, and a seventh means for detecting the recording position of the program to be searched based on the absolute time calculated by the sixth means. To do.

[Operation] In the digital data recording / reproducing apparatus having the above configuration,
Before recording the latest digital data, the TOC data that has already been recorded is played back to read the absolute time and program number, and the new absolute time and program number are recorded. It is possible to automatically record the absolute time and program number continuously when recording data, and as described above, the TOC data containing at least the absolute time and the program number is the digital data of the latest program. When program search is specified from the media that are sequentially recorded with, the absolute time and program number included in the TOC data can be read by simply playing for a predetermined short time, and rewinding during search. In advance on the recording medium Reproducing the control signal being recorded, so that so as to calculate the absolute time in the search by the control pulse, it is possible to search for the absolute position at high speed.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. The embodiment will describe a case where the present invention is applied to a PCM audio VTR.

FIG. 2 (a) schematically shows a track pattern on a magnetic tape in an embodiment of the digital data recording / reproducing apparatus according to the present invention.

In the PCM audio VTR, as shown in Fig. 2 (a),
PCM audio data and ID on the track of magnetic tape 1
The code and is recorded. 5 for each track (field)
It is divided into one block and each block constitutes one sub-frame. As shown in FIG. 2B, one subframe is further divided into 30 blocks of addresses 0 to 29.

FIG. 3 shows a format in which an ID code is recorded in each block.

As shown in FIG. 3, among the data of addresses 0 to 29, “1, 9, 17, 25”, “3, 11, 19, 27”, “5,
The addresses "13, 21, 29" and "7, 15, 23" are used as optional codes (8 bits each).

Data can be recorded in these optional codes as shown in FIGS. 4 to 6.

In FIG. 4 (a), 4-bit item (ITEM) and program number 1 (PNO-1) are recorded at addresses 1 and 17, respectively. Similarly, program numbers 2 (PNO-
2) and program number 3 (PNO-3) are recorded by 4 bits each, and index numbers (8 bits) are recorded at addresses 5 and 21.

Items (4 bits) are AC1 to AC when "0100"
It is indicated that 4 is a program number and an index number. The program number 1, the program number 2 and the program number 3 are three and represent a program number in a 3-digit decimal number.

The blank area in FIG. 4 (a) is an unused area.

The data at these addresses 1, 3, 5, 7 (17, 19, 21, 23) form data AC1 to AC4.

As shown in FIG. 5, the program numbers (8 bits) are recorded in the addresses 9 and 25, and the index numbers (4 bits) and the program start flag PSF (1 bit) are recorded in the addresses 11 and 27. It is recorded. The program number here represents the program number in binary. The index number (4 bits) represents the index number in binary, and the program start flag PSF (1 bit)
Makes it possible to identify the program start by setting it to "1" for 300 frames at the program start.

Further, the lower 3 bits of the addresses 11 and 27 represent the absolute time “time” in binary number, and the upper 2 bits of the addresses 13 and 29 represent the lower 2 bits of the binary absolute time “time” again. There is. Similarly, the lower 6 bits of addresses 13 and 29 are 2
It represents the "minute" of the absolute time by a decimal number, and the upper 2 bits of the address 15 again represent the lower 2 bits of the "minute" of the absolute time by a binary number.

The data at these addresses 9, 11, 13, 15 (25, 27, 29) form data SC1 to SC4.

The data of AC1 to AC4 and the data of SC1 to SC4 are combined and recorded at least once in each field.

FIG. 4 (b) shows a format for recording an absolute time as an ID code in an embodiment of the digital data recording / reproducing apparatus according to the present invention.

As shown in FIG. 4 (b), 4-bit item (ITEM) and absolute time (HOUR) are recorded at addresses 1 and 17, respectively. At addresses 3 and 19, the absolute time (MI
NUTE) is recorded in 8 bits, and at addresses 5 and 21,
The absolute time seconds (SECOND) are recorded in 8 bits. Further, in the 8 bits of the addresses 7 and 23, data representing the mode is set in the upper 2 bits thereof, and in the subsequent 6 bits, a frame number (FRAME) representing the frame position in the absolute time is recorded.

The item (4 bits) indicates that the optional code is an absolute time when it is "0001". Absolute time represents "hour" by HOUR (4 bits), 2 minutes decimal "minute" by MINUTE (8 bits), 2 digits decimal "second" by SECOND (8 bits), FRAME (6 bits)
Represents a 2-digit decimal frame number.

Further, when the second bit of the high-order 2 bits of the addresses 7 and 23 is 1, it represents the DROP FRAME MODE. In this mode, there is a state in which the frame numbers become discontinuous at regular time intervals, and the deviation between the real time and the absolute time is corrected.

The lower 6 bits of the addresses 7 and 23 represent a 2-digit decimal number "frame number".

Each data of AC1 to AC4 in FIG. 4 (b) is also
It is combined with the data of SC1 to SC4 in FIG. 5 and recorded at least once in each field.

FIG. 6 shows the format of TOC data in the ID code recorded / reproduced in the digital data recording / reproducing apparatus according to the present invention.

TOC data is available at addresses 1,3,5,7 (or 17,19,21,2
3) TOC-1 consisting of data AC1 to AC4 and address 1
It consists of TOC-2 consisting of 7,19,21,23 (or 1,3,5,7) data AC1 to AC4. TOC-1 and TOC-2
Are recorded continuously and at least 2 per field.
The data is repeatedly recorded on the entire tape by changing the data for each frame.

TOC-1 addresses 1 and 17 have 4-bit item (ITEM) and program number 1 (PNO-
1) is recorded. In addition, at addresses 3 and 19, a 4-bit program number 2 (PNO-
2) and program number 3 (PNO-3) are recorded,
An 8-bit point (POIN
T) is recorded.

The item (4 bits) indicates TOC-1 when "1000". Program number 1, program number 2, and program number 3 are 3
Represents the program number in 3-digit decimal number.

Furthermore, TOC-2 addresses 1 and 17 have an item (4 bits) and an absolute time HOUR (4 bits).
Is recorded. Absolute time MINUTE (8 bits) is recorded at addresses 3 and 19, and absolute time SECOND is recorded at addresses 5 and 21.
(8 bits) is recorded. Further, in the 8 bits of the addresses 7 and 23, data indicating the mode is set in the upper 2 bits, and when the second bit is 1, DROP
Indicates FRAME MODE, and the lower 6 bits are frame number F
RAME is recorded.

The item (4 bits) indicates TOC-2 when it is "1001". Absolute time is "time" by absolute time HOUR (4 bits)
Absolute time MINUTE (8 bits) represents a 2-digit decimal "minute", bus time SECOND (8 bits) represents a 2-digit decimal "second", and FRAME (6 bits) represents 2 digits Represents a decimal frame number.

The meanings displayed by the program number and absolute time differ depending on the point, and the corresponding relationship between the point and the program number and absolute time is as shown in FIG.

That is, if the point is B0, A0, A1, C0 or C1,
Program numbers 1, 2, and 3 represent the number of TOC data, the first program number, the last program number, the first skip area number, or the last skip area number, respectively. When the point is an index number from 00 to 99, the program number 1,
2 and 3 represent program numbers.

Similarly, if the point is B0, A0, A1, C0 or C1, then HOU
R, MINUTE, SECOND, FRAME is the first absolute time of the TOC information, the absolute time at the beginning of the first program, the absolute time at the end of the last program, the absolute time at the beginning of the skip area, and the absolute time at the end of the skip area. Represent. Points 00
HOUR, MINUT when the index number is from 99 to 99
E, SECOND, FRAME represent the absolute time at the beginning of the program represented by the program number and the index number.

Next, the operation of the digital data recording / reproducing apparatus according to the embodiment of the present invention for recording TOC data will be described with reference to FIGS.

As shown in Fig. 8, the program number is m, the index number is n, and the absolute time is 0 hours.
A case where recording is newly started from the position of 58 minutes, 31 seconds, and 18 frames will be described. The TOC data at this time is assumed to be recorded as shown in FIG. 9, for example. Since this is a new recording, the TOC data after this absolute time (data indicated by * in FIG. 9) will be deleted and new TOC data will be added and recorded. In the newly recorded TOC data, as shown in Fig. 10, the program number corresponding to point B0
The number of TOC data shown in 1,2,3 is changed. Further, the program number indicated by the program numbers 1, 2, and 3 corresponding to the point 01 is set to m + 1, and the current absolute time is set to HOUR, MINUTE, SECOND, and FRAME corresponding to it.

The method of generating TOC data during this time will be further described with reference to FIGS. 11 to 16.

Record button (not shown) at time t1 shown in FIG.
When is pressed and an instruction is given to the mechanical control CPU circuit 6 shown in FIG. 1, the mechanical control CPU circuit 6 notifies the CPU circuit 5 that the record button has been pressed,
The drive of the magnetic tape 1 is started (step S10 in FIG. 12).
reference). At this point, it is assumed that the TOC data has already been reproduced and input from the magnetic tape 1.

From the time t1 to the period T2, the CPU circuit 5 sets the audio data circuit 3 of the PCM circuit 2 in the recording mode and the ID code circuit 4 in the reproduction mode. At this time, the audio data circuit 3 inputs and outputs audio in a so-called EE (electrical-electrical) system, and the ID code circuit 4 (first means) inputs the ID code data from the magnetic tape 1. . As a result, the absolute time and program number are reproduced and input from the magnetic tape 1 (steps S11 and S1).
2).

Data to be recorded and data to be deleted are discriminated from the absolute time that has been reproduced and input (step S13). The data to be recorded is indicated by a circle in FIG. 13, and the data to be deleted is indicated by a cross in the same figure. Data with an absolute time greater than the current absolute time will be deleted.

When the number of data to be recorded is known, the data of PNO-1, PNO-2, and PNO-3 (FIGS. 6 and 7) at the point B0 is recorded target number + 1, that is, the number of recording target. And the total number of data to be added (step S1
Four). At this time, when the point C0 and the point C1 are not paired but only C0, 2 is added to the number of recording targets (steps S15 and S16).

During a predetermined period T3 (Fig. 11) following the period T2,
As shown in FIG. 14, the ID code circuit 4 is set to the recording mode, the CPU circuit 5 (second means) increments the program number from the reproduced and input data, and each time the control pulse is input, Absolute time is counted (step S17 to step S2
0). Except for the data at point A1, each time the absolute time is counted, it is compared with the data to be deleted (step S21).

In this comparison, when the counted absolute time becomes longer than the absolute time of the deletion target data, the deletion target data is changed from the deletion target to the recording target (step S22). Point C0
When the data of becomes the data to be changed,
The frame before starting recording becomes the data at point C1 and is added to the recording target. Also, the PNO of point B0−
1, PNO-2, and PNO-3 are also changed accordingly (step S23 to step S26).

Period T4 after the absolute time to start recording
As shown in Fig. 15, the mechanical control
The CPU circuit 6 outputs a recording start signal (REC START) to the PCM circuit 2, and the PCM circuit 2 (third means) receives the recording start signal to record data on the magnetic tape 1 (steps S27 to S32). ).

At this time, the data of the recording start point is added to the TOC data (step S28). Also, point C0 and point C1
If there is no pair of data and only the data at the point C0 exists, the data one frame before the recording start point is added to the TOC data as the data at the point C1 and recorded (step S
29, S30).

The data obtained by the above operation is as shown in FIG.

Next, with reference to FIG. 17 to FIG. 22, the operation when one embodiment of the digital data recording / reproducing apparatus according to the present invention performs a search using TOC data will be described.

The circuit for the search operation is constructed as shown in FIG. 17, and the ID code recorded on the magnetic tape 1 is read out by the PCM circuit 2 (fourth means) in the reproducing state, and the program number, It is supplied to the mechanical control CPU circuit 6 as absolute time and other TOC data. The control pulse recorded on the magnetic tape 1 is detected by the servo circuit 7 (fifth means) and supplied to the mechanical control CPU circuit 6 (sixth means).

The search operation is started by the user inputting the program number to be searched (see step S40 in FIG. 18). If the program number at the current tape position is not known, the reproduction mode is once entered and the program number is reproduced and input from the magnetic tape 1 (steps S41 to S43). Further, even when the absolute time at the current tape position is not known, the reproduction mode is once set and the absolute time is reproduced and input from the magnetic tape 1 (steps S44 to S46).

The user compares the program number to be searched with the program number at the current tape position (step S47), and when the program number at the current tape position is equal to or larger than the program number to be searched, the TOC data is confirmed ( Step S6
Four). Magnetic tape 1 when TOC data is not known
Since the TOC data of the program to be searched is recorded above, it is reproduced and input from the magnetic tape 1 (steps S65 and S66).

When the program number that the user wants to search is larger than the current program number, the TOC data of the program to be searched is not recorded on the magnetic tape 1 at the current position, so the program is temporarily stopped and then fast-forwarded (step S48). , S49). At this time, the fast-forwarding time is counted while confirming that there is no non-recorded portion by the control pulse, that is, the recording is continuous (steps S50, S51).

After fast-forwarding for a predetermined time, for example, 10 seconds, the playback mode is set, and the program number and absolute time are played back and input from the magnetic tape 1 (step S52).
Through step S55), the operation of comparing the program number reproduced and input again with the program number to be searched is repeated (step S47).

When a non-recorded portion is detected in step S50, it is rewound to a position slightly before the last recorded portion (steps S56 to S59), the reproduction mode is set, and the program number and absolute time are reproduced and input from the magnetic tape 1. (Step S60 to Step S6
2).

Compare the program number you want to search with the program number at the current tape position (step S6
3) When the program number at the current tape position is smaller than the program number to be searched, the program to be searched is not recorded, so the operation is stopped and the search is finished (steps S74, S75).

If the program number at the current tape position is the same as or greater than the program number you want to search for, the TO of the program you want to search on magnetic tape 1
Since the C data is recorded, the TOC data is reproduced and input from the magnetic tape 1 and the TOC data is stopped when the TOC data is found (steps S65 to S67).

The mechanical control CPU circuit 6 (sixth means) knows the beginning of the program to be searched from the obtained TOC data by the absolute time, so every time a control pulse is reproduced and input from the magnetic tape 1 while rewinding. Decrement the current absolute time,
The absolute time of the magnetic tape 1 being searched is used as the absolute time and compared with the absolute time of the program to be searched (steps S68 to S71).

When the decremented absolute time becomes shorter than the absolute time of the program you want to search, enter the playback mode (steps S68 to S72,
When the program number of the program to be searched is read, the program is stopped and the search is completed (steps S73 to S75).

The above operation is schematically illustrated for four cases in which the magnitude relationship between the program number at the current tape position and the program number to be searched is different.
As shown in FIGS. 19 to 22.

In addition, the method of using TOC data in the above-mentioned embodiment,
The same application is possible not only when recording from the top of a magnetic tape that has already been recorded, but also when performing joint recording in which recording, stopping, and recording are repeated.

As described above, the present invention has been described with reference to the embodiments. However, various modifications are possible according to the technical concept of the present invention. For example,
In the above-described embodiment, the absolute time and the program number are read after the magnetic tape has started running by pressing the record button, but other TOC data can be read at the same time. However, since it is preferable that the time until recording is started is short (about 2 seconds as shown in FIG. 11), it may not be possible to read when the amount of TOC data is large in this short time.

Also, the program number to be searched is compared with the program number at the current tape position, and if the program number at the current tape position is larger than the program number to be searched, a blank search is immediately performed to search for the recording end point, and the last There is also a method of entering the search after reproducing and inputting the TOC data corresponding to the program.

According to the embodiment described above, the following effects can be obtained.

Since it can be realized by microcomputer software, it does not cost much.

It is difficult to record TOC data with a consumer VTR, but it becomes possible to record it, and at the time of playback, the program information before that portion can be obtained, and if the last recorded program is played, the program information of the entire tape can be read. Is obtained.

Even with a device without VISS or VASS, you can search any program at high speed without rewinding to the tape start point.

By counting the absolute time and the program number, it is possible to search by absolute time from the tape start point without returning to the tape start point.

[Effects of the Invention] As described above, according to the digital data recording / reproducing apparatus of the present invention, the TOC data already recorded before the recording of the latest digital data is reproduced to obtain the absolute time. Since the program number is read out and the new absolute time and program number are recorded, it is possible to automatically record the absolute time and program number continuously when overwriting or joining recording. With
From the medium in which the TOC data including at least the absolute time and the program number as described above are sequentially recorded together with the digital data of the latest program,
When a program search is specified, the absolute time and program number contained in the TOC data can be read by simply playing for a short period of time, and is recorded in advance on the recording medium during rewinding during search. Since the control signal is reproduced and the absolute time during the search is calculated by this control pulse, the absolute position can be searched at high speed.

[Brief description of the drawings]

1, FIG. 14, FIG. 15 and FIG. 17 are block diagrams showing the configuration of an embodiment of a digital data recording / reproducing apparatus according to the present invention, and FIG. 2 (a) is a digital data recording according to the present invention. A front view of the magnetic tape for explaining the track pattern of the magnetic tape in the embodiment of the reproducing apparatus, FIG. 2 (b) is a view for explaining the format in the sub-frame in FIG. 2 (a), and FIG. An explanatory diagram of an ID code format in one embodiment of the digital data recording / reproducing apparatus according to the present invention, and FIGS. 4 (a) and 4 (b) are program numbers or absolute values in one embodiment of the digital data recording / reproducing apparatus according to the present invention. FIG. 5 is an explanatory diagram of a time format, and FIG. 5 is a program number and absolute value in one embodiment of the digital data recording / reproducing apparatus according to the present invention. FIG. 6 is an explanatory diagram of a time format, FIG. 6 is an explanatory diagram of a TOC data format in an embodiment of the digital data recording / reproducing apparatus according to the present invention, and FIG. 7 is an explanatory diagram of a data format in the embodiment of FIG. , FIG. 19 to FIG. 22 are views for explaining a search operation of the digital data recording / reproducing apparatus according to the present invention, FIG. 8, FIG. 9, FIG. 10, FIG. FIG. 12 is a diagram for explaining the format of TOC data change in one embodiment of the digital data recording / reproducing apparatus according to the present invention, and FIGS. 12 and 18 explain the operation of one embodiment of the digital data recording / reproducing apparatus according to the present invention. It is a flowchart. 1 ... Magnetic tape, 2 ... PCM circuit, 3 ... Voice data circuit, 4 ... ID code circuit, 5 ... CPU circuit, 6 ... Mechanical control CPU circuit, 7 ... Servo circuit.

Claims (1)

(57) [Claims] 1. An ID code including at least an absolute time indicating an absolute time from a starting point of a recording medium, a program number corresponding to each program, and TOC data indicating information of each program in absolute time.
In a digital data recording / reproducing apparatus for recording / reproducing predetermined digital data on / from the recording medium, when recording of the latest digital data is instructed, it is already recorded on the recording medium before starting the recording. A first means for reading the absolute time and the program number; and a second means for calculating a new absolute time and a new program number so as to be continuous with the absolute time and the program number read by the first means. Means, third means for recording the absolute time and the program number calculated by the second means on the recording medium together with the TOC data and the latest digital data, the absolute time, the program number, and ID containing at least TOC data When a command for searching for the program having the predetermined program number is issued from the recording medium on which the program is sequentially recorded together with the digital data of the latest program, the reproduction mode is set for the predetermined period and the recording is performed. Fourth means for reproducing the medium and reading the absolute time, program number and TOC data from the reproduction signal, and when the program number to be searched is larger than the program number read by the fourth means , Fast-forwarding the recording medium for a predetermined period, and
When the program number to be searched is smaller than the program number read by the fourth means, the recording medium is rewound, and the rewinding operation is performed at the time of rewinding. A fifth means for detecting a control pulse previously recorded on the recording medium, and the absolute value read by the fourth means by a value corresponding to the number of the control pulses detected by the fifth means. Sixth means for calculating the absolute time of the recording medium being rewound by subtracting the time, and the recording of the program to be searched based on the absolute time calculated by the sixth means. And a seventh means for detecting the position. Digital data recording and reproducing apparatus.