JPH0696558A - Digital signal recording/reproduction device - Google Patents

Abstract

PURPOSE:To reduce time from initiation of reproduction to the display of a total program number. CONSTITUTION:The title device generates a set of a program number and an absolute time code for detecting the position of the program 301 when recording TOC and then generates the TOC data 302. Further, a first program number and a last program number are selected 303 from all program numbers. Further, the starting and ending edges of the TOC area are indicated, a TOC partition including the above first program number and the last program number is recorded 307, and then a TOC which is a set of the program number and the absolute time code indicating the top of the program number is recorded 305.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TOC recording / reproducing method in a digital signal recording / reproducing apparatus such as an S-DAT (fixed head type digital audio tape recorder).

[0002]

2. Description of the Related Art In recent years, digital technology has been applied to many fields such as sound and images, and technologies such as a CD player, R-DAT, and rotary head type digital VTR have been established. Among them, in addition to the basic PCM signal recording / reproducing technology, technology for pursuing ease of use such as high-speed search and display of recorded data contents has become important.

In realizing the above technique, there is a method of recording the contents of recording data and the like using an auxiliary data area of a recording medium.

Among the techniques using the auxiliary data area, T
The first program number, the program number of the registered program, and the last program number are read in this order using a table of the start address of the song called OC (Table Of Contents), and then the first program number and the last program are read from the program number. A technique for selecting a number, calculating a total program number, and displaying the number is used in DAT.

A conventional display method will be described below by taking DAT as an example. FIG. 8 shows an example of the TOC recording format.

The absolute time and the TOC format of DAT (Digital Audio Tape Recorder) are 198.
"DIGITAL" issued by the DAT round-table conference in June 7
AUDIO TAPE RECORDER SYSTEM
M ″, P76 to P77.

The DAT sub data area is recorded in the auxiliary data area in a format called a pack.

In FIG. 8, the upper 4 bits of byte 0 are a pack item indicating the contents of the pack, and "0100" is recorded when the following data contents are TOC data. The lower 3 bits of byte 0 and byte 1 are the program number of each program (see program numbers 1, 2, and 3 in FIG. 7). Byte 2 is point data that classifies the data content of the TOC pack. Byte 3 indicates the digit of the absolute time of the program number B
CD code, byte 4 is a BCD code indicating the digit of the absolute time of the program number, byte 5 is a BCD code indicating the digit of the absolute time of the program number, and byte 6 is a BCD indicating the frame of the program number. Is the code.

Details of the contents of each TOC data will be described below. FIG. 7 is a diagram showing the relationship between the points and TOC data contents. In FIG. 7, the point = AA of the TOC pack indicates the TOC area start flag, and the point = BB indicates the start of the TOC area (TO
C start point flag), 66 ± 6 frames are recorded (70
1), point = B0 indicates the starting point indicating the beginning of the TOC (702), point = A0 indicates the program number of the first program on the tape and the absolute time indicating the program (703), point =
00 to 99 indicate the program recorded below and the absolute time indicating the start position of the program (704), and point = A0 indicates the program number of the final program of the tape and the absolute time indicating the ending point of the program. (705), point = BB is TO
The end of the C area is indicated and the end flag is recorded for 33 ± 3 frames (706).

When recording the TOC, the start flag and end flag of the TOC must be recorded. The point of the start flag is BB and the point of the end flag is EE. Even if there is no program number to register, TOC data is recorded.

FIG. 2 shows an example of tape recording for implementing the conventional data display method. At the beginning of the tape, there is a TOC recording area called a TOC area that can be recorded by the user. Audio data is recorded after the TOC area, and this is divided into units called programs. Usually, one music piece corresponds to one program. Each program has a number called a program number. Also, an absolute time indicating an absolute address on the tape is recorded on the tape. In the TOC area, a TOC area start flag indicating the start of the TOC, a TOC start point flag, absolute time data indicating the program number of the music piece and the recording position of the program, and a TOC end flag indicating the end of the TOC are recorded.

Next, the display of the total program number and the like using the TOC will be described. When the cassette is inserted into the playback device, first the search for the beginning of the TOC area at the beginning of the tape is started, and the TOC area start flag, TOC
The start point flag, the first program number, the program number of the registered program, the last program number, and the end flag of the TOC are read in this order, and then after selecting the first program number and the last program number, the total program number is calculated. , Display.

[0013]

However, in the above conventional configuration, when the TOC is used to display the total program number, the reading of the first program number and the last program number of the TOC area at the beginning of the tape is completed, and the total program number is completed. Since the program number is calculated and displayed, there is a problem in that it takes time to display the total program number.

The present invention solves the above-mentioned conventional problems. By recording the first program number and the last program number in advance in the TOC partition in which the TOC area is marked and searching and reading the TOC partition, It is an object of the present invention to provide a digital signal recording / reproducing apparatus capable of displaying a first program number, a last program number, calculating a total program number from the program number, and shortening the time required for display.

[0015]

In order to achieve the above object, the present invention provides a digital signal recording / reproducing apparatus with a TOC data generating means for generating a set of a program number and an absolute time code indicating the program number. A program number selecting means for selecting a first program number and a last program number from all the program numbers; and a recording means for recording a TOC partition indicating the start and end of the TOC and including the first program number and the last program number.
A TOC recording unit for recording a set of a program number and an absolute time code indicating the beginning of the program number, and a recording unit for recording the same TOC partition as the TOC partition are provided.

[0016]

Therefore, according to the present invention, by reproducing the TOC partition indicating the start and end of the TOC area and including the first program number and the last program number, the TOC partition is immediately read after the TOC partition is read. Since the program number can be calculated, the time required for displaying the information of the total program number can be shortened.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

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

In FIG. 1, 100 is a magnetic tape and 10 is a magnetic tape.
Reference numeral 1 is a cassette that stores a magnetic tape, and 102 is a mechanism control unit that controls the running of the magnetic tape in accordance with an instruction from the system control unit 105. Reference numeral 103 is a recording / reproducing head for recording / reproducing on / from a magnetic tape. The recording head is composed of nine heads, one head records auxiliary data such as control data used for reproduction control, and the remaining eight heads record main data such as audio data. The reproducing head is composed of nine heads, one head outputs an auxiliary channel reproduction signal including control data used for reproduction control, and the other eight heads output a main channel reproduction signal including audio data. Output. The magnetic tape is divided into upper and lower areas, one of which is used for recording in the forward direction.
The other is used for recording in the reverse direction. When reversing the running direction, the head is rotated 180 degrees. The recording pattern is shown in FIG.

The recording / reproducing unit 104 adds an error correction code to the input audio data, modulates it by 8-10 and outputs it as a main channel recording signal to the recording / reproducing heads 103 of the eight recording channels for recording main channels. At the same time, an error correction code is added to auxiliary data used by the system control unit 105 for use in traveling control and the like, and the modulated data is supplied to the envelope modulation unit 107 as auxiliary channel recording data. The reproduction signal reproduced by the reproduction heads for reproduction of the eight main channels is demodulated, error correction is performed, and output audio data is output, and at the same time, the reproduction head for reproduction of one auxiliary channel in the recording and reproduction head 103. The demodulated auxiliary channel playback data is demodulated, error correction is performed, and the auxiliary data is output. It is sent to the control unit 105. The auxiliary data recorded by the recording / reproducing unit 104 includes a TOC and a TOC partition. Display data from the TOC and TOC partitions is displayed on the display unit 111 under the control of the system control unit 105.

The system control unit 105 instructs the mechanism control unit 102 a running mode, and the recording / reproducing unit 104.
To the recording / playback mode, and receives the TOC, absolute time, etc. from the recording / playback unit 104.
Generate data. The system control unit 105 sends data used for search control such as absolute time, TOC, and TOC partition to the recording / reproducing unit 104. The system control unit 105 provides the envelope modulation unit 107 with search mark information used as a mark when searching for a start ID, a lead-out area ID, and the like. The system control unit 105 receives the run length information of the demodulated auxiliary data from the envelope demodulation unit 108 and detects the search mark information. The system control unit 105 can be realized by a microprocessor or the like. Reference numeral 106 denotes a recording / playback mode setting unit for the user to give a command to the system control unit 105. The user uses the recording / reproducing mode setting unit 106 composed of a switch or the like to instruct a general operation mode such as recording, reproducing, or searching.

Although the input / output of the recording / reproducing apparatus is audio data in this embodiment, it may be other data such as image data, so that it is generally called main data for auxiliary data used for control. Reference numeral 107 modulates the auxiliary channel recording data output from the recording / reproducing unit 104 on the basis of search mark information such as a start ID flag and a lead-out area ID flag supplied from the system control unit 105, and the recording / reproducing head 103 outputs the modulated data. It is an envelope modulation unit that outputs to one of the recording heads for recording auxiliary channels.

Reference numeral 108 denotes a digital signal recording / reproducing head 1.
03 demodulates the auxiliary data output from the recording / reproducing unit 1
Output of auxiliary channel data to 04, system control unit 1
Reference numeral 05 denotes an envelope demodulation unit that outputs run length information. A reel rotation speed detection unit 109 detects the rotation speed of the reel and sends the reel rotation speed data to the system control unit 105.

Next, an example of TOC recording will be described. Figure 6
FIG. 4 is a diagram of an example of TOC signal recording. As shown in FIG. 6, the first frame of the auxiliary track has a TOC partition and a second frame.
Program number 1 and its absolute time in the frame,
In the third frame, the program number 2 and its absolute time are recorded subsequently, and finally the TOC partition which is the same data as the already recorded TOC partition is registered.

Next, an example of TOC partition recording format is shown. FIG. 9 shows an example of the TOC partition recording format. Byte address 5N + 1 as shown in Figure 9
0 (N = 1, 2, 3, ...) Indicates the content of TOC
In the case of an OC item and a TOC partition, the data content is 0A: H. Byte address 5N + 11
Is the first program number, byte address 5N
+12 is the last program number, byte address 5
N + 13, byte address 5N + 14 is the number of programs,
A TOC item indicating the number of TOC data such as the number of indexes is registered.

Next, the recording operation of the TOC and TOC partition will be described. FIG. 3 is a flowchart showing the operation of the system control unit 105 when recording the TOC and TOC partition. In FIG. 3, reference numeral 301 denotes an operating means for instructing the mechanism control section 102 to rewind the tape and search the program, and to read the program number and the absolute time of the program. At this time, the system control unit 105 instructs the recording / reproducing unit 104 to read the program number in the auxiliary data recorded on the magnetic tape 100 stored in the cassette 101 and the absolute time of the program. Figure 10
9 is a flowchart showing a detailed operation of processing 301.

In FIG. 10, 1001 is a process for instructing the mechanism control unit 102 to rewind the tape to the beginning end, and 1002 is a process for searching the program toward the tape end direction and stopping it when the beginning of the program is detected. , 1003 is a process for reading the program number of the detected program and the absolute time of the start position of the program, and 1004 is the reel rotation speed detection unit 107.
The process 301 is terminated when the reel rotation speed data sent from the device becomes 0, and otherwise the process branches to the process 1002. 302 generates a set of a program number and an absolute time code of the program number,
TOC data generating means showing TOC data generating processing arranged in order of program number, 303 is a first program number from all program numbers, and program number generating means showing program number selecting processing to select the last program number. 304 is a first program. TOC partition generation means for generating the TOC partition data described in FIG. 9 based on the number and the last program number, 3
Reference numeral 07 denotes the TOC partition data recording / reproducing unit 10.
4 and TOC partition recording means for instructing the processing of recording on the magnetic tape 100 from the digital signal recording head 103, 305 is the above-mentioned TOC format which is a set of a program number and an absolute time code indicating the beginning of the program number. The digital signal recording head 1
03 to specify the recording process on the magnetic tape 100
OC data recording means, 306 indicates TOC data recording means for instructing a process of re-recording the same TOC partition as the previously recorded TOC partition. 305,
The units 307 and 306 are collectively called a recording unit.

Next, the operation of reproducing the TOC and displaying the total program number will be described. FIG. 4 is a flowchart showing the operation of the system control unit 105 when generating the TOC and displaying the total program number. Four
Reference numeral 01 indicates an operation of controlling the mechanism control unit 102 to detect the TOC partition and rewinding the tape. After that, the system control unit 102 and the recording / reproducing unit 1
The tape reproduction operation is performed on 04. The operation 402 is performed after the reproduction is started, and the TOC partition data recorded on the magnetic tape 101 is recorded / reproduced by the recording / reproducing unit 104.
The operation of demodulating with, reading of the demodulated data, and TOC partition detection operation are shown. Reference numeral 403 represents an operation of reproducing the first program number and the last program number included in the TOC partition and storing them in the memory. Reference numeral 404 represents an operation of transmitting the reproduced first program number and last reproduced program number to the display unit 111 and displaying them. Reference numeral 405 represents an operation of calculating a total program number based on the first program number and the last program number. Reference numeral 406 denotes an operation of transmitting the total program number to the display unit 111 and displaying it. After that, the TOC data is read from the magnetic tape 100, and when the TOC partition is detected, the TOC reproduction is ended. Four
Reference numeral 07 indicates an operation of reading the TOC data recorded later. 408 is the TO after the end of the next TOC recording
The operation of reading the C partition is shown.

Therefore, according to the present invention, by recording the first program number and the last program number in the TOC partition area, the total program number and the like can be displayed before all the TOC data is read.

[0030]

According to the present invention, TOC data generating means for generating a set of a program number and an absolute time code indicating the position of the program, and selection of a first program number and a last program number from all the program numbers. Program number selecting means, TOC partition generating means for indicating the start and end of the TOC area and including the first program number and the last program number, TOC partition recording means for recording the TOC partition, program number and its TOC recording means for recording a set of absolute time codes indicating the beginning of the program number, and then the same TOC as the TOC partition
It has TOC partition recording means for recording the partition.

Therefore, with the above configuration, by reproducing the TOC partition, it is possible to reproduce the total program number immediately after the start of reading the TOC partition. Therefore, the total program number is calculated before the TOC data is read. This has the effect of speeding up the information display such as the total number.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a conventional example of recording auxiliary data.

FIG. 3 is a flowchart showing a recording operation of the TOC partition in the embodiment of the present invention.

FIG. 4 is a flowchart showing the TOC partition playback operation and total program number display in the embodiment of the present invention.

FIG. 5 is a recording pattern diagram on a digital signal recording medium (tape) in the embodiment of the invention.

FIG. 6 is a diagram showing an example of TOC signal recording in the embodiment of the present invention.

[Fig. 7] Relational diagram between points inside the conventional TOC area and TOC data contents

FIG. 8: Conventional TOC data recording format diagram

FIG. 9 is a TOC partition recording format diagram in the embodiment of the present invention.

FIG. 10 is a detailed flowchart of step 301 in FIG.

[Explanation of symbols]

 100 magnetic tape 101 cassette 102 mechanism control unit 103 digital signal recording / reproducing head 104 recording / reproducing unit 105 system control unit 106 recording / reproducing mode setting unit 107 envelope modulating unit 108 envelope demodulating unit 109 reel rotational speed detecting unit 111 display unit

Claims (2)

[Claims] 1. A TOC data generating means for generating a set of a number corresponding to a program and an absolute time code indicating the position of the program, and a first program number and a last program from all the numbers corresponding to the program. A program number selecting means for selecting a number, and a T indicating the start and end of the TOC area and including the first program number and the last program number.
OC partition generating means, recording means for sequentially recording the TOC partition, recording a TOC that is a set of a program number and an absolute time code indicating the beginning of the program number, and then recording the same TOC partition as the TOC partition. Digital signal recording / reproducing apparatus having. 2. A digital signal recording / reproducing apparatus having a recording device according to claim 1, further comprising head recording detecting means for detecting a head position of the digital signal recording medium, and recording the TOC and TOC partition at the head position of the digital signal recording medium. .