JPH01273283A - Indexing information recording method - Google Patents

Abstract

PURPOSE:To eliminate a discrepancy between indexing information and the actual content of a program by assigning program numbers again in order to all programs a recorded in a tape from the starting edge of the tape before recording the indexing information. CONSTITUTION:Upon receiving an indexing instruction, a tape is rewound to the starting point and the presence/absence of already recorded indexing information is detected. When the presence of the information is discriminated, the tape is rewound to the starting point of the information and the information is erased. The erasure of already recorded information is performed in order to prevent remaining of indexing information which is discrepant from an actual record which causes operation stoppage in the course of operation carried on thereafter. After erasing the recorded indexing information, the tape is rewound to the starting point and the indexing information is recorded after program numbers are assigned in order to all recorded programs.

Description

[Detailed description of the invention]

B) Industrial Application Field The present invention provides table of contents information that facilitates the cueing operation in a magnetic recording and reproducing apparatus that records and reproduces audio signals, etc. in the form of distal signals on a magnetic tape using a rotary head. on how to record. (b) A digital audio tail recorder (DAT) is a conventional technology that records and reproduces audio signals in the form of digital signals using a rotating head sound. In order to facilitate the music selection operation of log tsum, Japanese Patent Application Laid-Open No. 123078/1983 CGI IB
27/10), a technique has been proposed that utilizes table of contents information recorded on the same tape. In this conventional technology, the table of contents information consisting of multiple sets of the name of the recording signal and the start count value of the recording signal is recorded on a predetermined messenger, nine magnetic tapes are used, and when the magnetic tape is loaded, the table of contents information By performing a search operation and reading the table of contents information, the user can easily select a song. Problems to be solved by e'9 @ Akira The above-mentioned conventional technology is effective when using a playback-only tape such as a soft tape, but when recording another film on top of an already recorded film, There is a disadvantage that there is a discrepancy between the table of contents information and the contents of the actually recorded program, and it does not function as table of contents information.Therefore, the present invention aims to provide a method for recording table of contents information. In order to achieve the above object, the present invention aims to provide a method for easily and accurately modifying table of contents information by adding programs. In the information recording method, program numbers are re-added sequentially from the beginning of the tape to all programs recorded before the table of contents information is recorded. Also, before all new table of contents information is recorded. The presence or absence of old table of contents information that has already been recorded is detected, and if there is already recorded table of contents information, it is first erased, and program numbers are assigned to all recorded programs in order from the beginning of data 1. The new table of contents information is then added again, and all of the new table of contents information is then recorded.Furthermore, a program start identification signal is recorded at the start position of each program, and the start identification signal of the program closest to the beginning of the tape is recorded. Table of contents information is written at the locations where stone bones are recorded. According to the above method, program numbers are added to all programs in an orderly manner before table of contents information is recorded, and accurate table of contents information is recorded. (f) Example Hereinafter, an example of the present invention will be described based on FIGS. 1 to 10. Figure 1 shows the circuit configuration of the present invention. +1+ is an input terminal into which an information signal such as an audio signal is input, 121 is an input terminal to which an information signal such as an audio signal is input, and 121 is an input terminal that interleaps the input audio signal and adds all check codes for error correction. A digital signal processing circuit that converts into a digital signal that has undergone processing such as compression,
13I is a subcode generation circuit that generates subcode signals such as a program number, time information, and an identification signal indicating the beginning of the program (the tth servo signal of the 41st tracking control).

servo signal generation circuit that generates [that is, pilot signal and sync signal]; A switch circuit that is selectively switched at a predetermined timing to record a subcode signal, 16 (is a recording amplifier, 17+ recording amplifiers (a rotary transformer that supplies the output of 6 birds to a recording/reproducing magnetic head (81'), +9+ (111 is the output from the reproduction amplifier litm=2 which converts the signal into a digital signal using the clock from the PLL, and also performs all error correction and de-interleaving. C2 is a subcode processing circuit that extracts and processes subcodes from the reproduced digital haiku code; C3 is an output terminal for the demodulated analog signal; (14)
1 (151 is a motor that drives the supply reel shaft and take-up reel shaft, respectively, C61 is the motor drive control circuit, Cl71
is the capstan motor, α81 is the cylinder, C1
9 is the motor drive control circuit, ■ is the regeneration amplifier fill
The QIJ is a servo circuit that extracts a servo signal for tracking control from the key input circuit and generates a traving error signal. Evening 0σ
Control the drive/stop 1 rotation speed and rotation direction of say+ns, and. This is a control circuit that controls the display circuit 1231 for displaying various information. Therefore, during recording, the audio signal input to the input terminal 11I is first converted into a digital signal by the digital signal processing circuit 12+, and then the subcode is generated. The sag code signal generated by the circuit 131 and the servo signal from the servo signal generation circuit +41 are sent to the recording amplifier 7"+61.The output of the recording amplifier 1C61 is then transmitted to the rotary transformer (7;) of the rotating head cylinder. Also, during playback, the 7t!r type signal recorded on the tape (91) is read by the rotating magnetic head 18+ and transmitted from the rotary transformer 17+ of the rotating head cylinder. It is sent to the playback amplifier 7TIIk.Then, this playback amplifier rll
The output of j is converted into a digital signal by creating a clock from data using a PLL etc. in a digital signal processing circuit 1υ, and then converted into an analog signal, which becomes the original audio signal and is output from the output terminal (]3. Next, I will explain about the DAT tape footer□
Figure 2 shows the tape foot mat of DAT.
In each recording track TK, the PCM audio signal is recorded in which area PCM in the track T, and in the two areas ATFK on both sides of this area PCM, the servo signal of the tracking servo is recorded, and furthermore, in the area 5UBvc on that side.
02 subcode areas 5 in which subcodes are recorded, and margin areas are provided at the beginning and end of each track T.
U8iC#: Subcode blocks of 8 profiles are written each, and subcodes with the same content are written in the upper and lower areas of 21 tracks. □Figure 3 shows the mounting of the subcode blocks, One block consists of 288 bits, and the first 8 bits are the pro-rough synchronization signal 5YN.
C1 next 8 bits of data W1 subcode ID, next 8 bits of data W2fl subcode ID and its block address signal, next 8 bits of data W1 and W2 error correction parity P, remaining 256 bits (8 bits) 1 symbol is composed of 32 symbols) is subcode data and its parity for error correction.The 8-bit and 9-bit data WIW2 is recorded as shown in Figure @4 in more detail. That is, MSf3i of data W2
It is used to identify whether the block is a PCM data blow I or a subcode block, and if it is a subcode block, it becomes (1) as shown in the figure. Data W
The lower 4 bits of 2 are the block address and its LSB is [
The content of the subcode ID differs depending on whether it is [0] or (1).
], data W1 consists of a 4-bit control and a 4-pict data ID, and the upper 3 of data W2
The bit is set as a foot-mount ID. At this time, the control ID 1C is a program start identification signal (S-ID) indicating the start position of the program, and whether table of contents information is recorded in the program. TO indicating whether or not
C-ID is written. When the LSB of the block address is (1), the data W
1 and the upper 3 bits of data W2 indicate the program number □The program number is represented by a 3-digit BCD code, and the upper 3 bits of data W2 PNO-1 indicate the most significant digit, and the upper value 4 bits of data W1 indicate the program number. -2 represents the middle digit, and lower 4 bits PNO-3 represents the least significant digit, and PNO-1, 1'NO-2, PNO-3'l+- are collectively referred to as PNO-ID. PNO-IDfl(00
1) to (799) are displayed, and program 8 indicates that (OBB) is the lead-in area, (OEE) is the lead-out area, and (Q&A) is invalid. Note that subcode blocks whose block address LSB is (0) and subcode blocks whose block address is [1] are recorded alternately in 4 of the 8 blocks of each subcode area SUB, and normally the LSB of the block address is ( 1) and (0) 2
All three subcord blocks are treated as one set. The subcode data is WI, and as shown in Figure 5, there are seven pieces of data called back data (PACK
-1 to P ACK-73 (C1) is set to be recorded, and the number of back data recorded is indicated by the 8CD code of 3 days shift. □In other words, for example, when the Funamat ID is [o11], PACKI~PAC
K3 and CI are recorded, all other areas are (0)
is recorded. Four bit data called items are recorded at the beginning of each back data and are used to identify the contents of each back data. That is, if the item is [0001
), the back data is the time from the start of the program, (0010), the back data is the absolute time from the beginning of the tape, or [0100] and ah
Indicates that the back data is table of contents information. Note that the table of contents information records the program number, its start time, etc. Among the subcodes, the start identification signal is recorded at the beginning of each program as follows. That is, during recording, when recording is started from the store 1 state or the pause state, a start identification signal is recorded for, for example, 9 seconds at the beginning. This start identification signal is also recorded for 9 seconds at the beginning of the next program when a no-signal period between programs continues for a predetermined period of time during recording. In addition, when recording program numbers from the beginning of the tape, a serial number is recorded for each program along with a start identification signal, and recording can be performed from the middle of the tape. If so, (OAA) is recorded. Therefore, the recorded tape 19I becomes as shown in Figure 6, for example. In the figure, programs A and 8 are recorded continuously from the beginning of the tape, and after interrupting recording, programs C% and E are recorded. This is what I did. On Day 1 (9I), which performs such recording, as shown in the figure, in the 5-ID area of the subcode of each program, [1] is recorded for the first 9 seconds. [0] is recorded for the rest. Also, program numbers (001) (002) are recorded for programs A and B that were recorded continuously from the beginning of the tape, and for programs C, D, and E that were recorded after recording was interrupted. (OAA) indicating that the program number is invalid is recorded.Otherwise, (000) indicating that program number 4+ is not recorded is recorded, and at the same time, the absolute time is set to PACKl, and the program starts. The time from PA
□ Recorded in CK2 Furthermore, since table of contents information has not been created at this point, the TOC-ID of the control ID is (0). Note that the shaded area represents the unrecorded area. Next, the creation of the table of contents information on the tape recorded in this way (910 will be explained based on FIG. 7). First, when the table of contents creation is instructed (step ″). Rewind the tape (9; to the starting edge in step (5))
, Perform a TOC search to search all the table of contents information in step ① , TOC search is performed at high speed playback at approximately 10 times the normal tape speed, and the TOC-ID of the control ID
=2 plays. At stay J1@, determine the presence or absence of table of contents information, that is, whether the TOC-ID is (t) or (0), and
-ID is

The tape is transformed from [0] to [1] and stopped at time t, that is, when the start point of the table of contents information is detected.
Since the start point of the table of contents information has been exceeded due to the overflow caused by the inertia of the tape, the table of contents information is erased in step Q81 after being rewound accurately to the start point of the table of contents information by -1x reverse playback. . The purpose of erasing the TOC first in this way is to prevent the operation from stopping during subsequent operations.
This is to prevent table of contents information from remaining that is inconsistent with the actual record. TOC erasure in step (2) is performed according to the flowchart of FIG. That is, first, in step old, the subcode is played from the starting point of the table of contents information, and its contents are memorized (step (2)) 0 At this time, step! 45) determines the end of the table of contents information, and if it is the end, stores the absolute time at that point in step 14bl. Then, in step 7 (4n1 book, returns to the start point of the table of contents information with 3x reverse playback) , perform dubbing with the subcode stored in step (44) and TOC-IDIC(0)ji.
In step "la), dubbing of C is performed up to the absolute time stored in step 1461 (step 151), and TQ
C Finish erasing. l (Stay J7" (51)) When ToC erasing is completed, the tape is wound back to the beginning of the tape at the step field. If it is determined that table of contents information is not recorded at step @, the tape is wound back to the beginning of the tape at the step as well. After that, proceed to step gloss and perform a high-speed search at approximately 200x speed to check whether there is a start identification signal and whether it is a lead-out area (program number is (OEE)).
] and if the presence or absence of a recording signal is detected, or if a start identification signal is detected at step CD, the tape is stopped, and at step 7t341, the tape is rewound to the starting point of the start identification signal, and at step CD, the tape is rewound to the starting point of the start identification signal. At the same time as recording the absolute time, in the step (to), the program number is dubbed and numbered using the serial number from the beginning of the tape, and when the dubbing is finished, the high-speed search for Stella 1ω is continued again, and thereafter the program numbers are sequentially renumbered in the same way. Meanwhile, enter the program number during high-speed search.
1 (Judging from 1B, if the program number is (OEB:), remember the absolute time at that position (Status 17 (17))
L, Proceed to step (to) □ Also, in step 91 (to), it is determined whether there is a recorded signal, and if there is a recorded signal, the high-speed search continues □ If there is no recorded signal, proceed to step c (9) Rewind to the end, memorize the absolute time, and repeat the program number (Og E) for, for example, 9 seconds, then memorize the absolute time with Stella 1 and proceed to step (To). When the operation is completed, as shown in Figure 9, the program number of each program is recorded as a serial number from the beginning of the tape, and a lead-out (OEK) is recorded in the program number at the end of the recording, completing the renumbering. Finally, in step (to), the absolute time of the start point of each program stored in step (to) and the absolute time of the lead-out part stored in the step book are used as table of contents information, and the start III of program number (001) is separated. Perform TOC dubbing from the starting point of the signal. In this way, a TOC is created near the beginning of the tape as shown in Figure 10.Next, on the tape on which table of contents information has been created as shown in Figure 10, When a new recording is performed, the continuity of program numbers is lost and there is also a discrepancy between the contents of the table of contents information and the actual recorded program.Even in such a case, by instructing renumbering,
0 - The table of contents information is corrected as well as renumbered according to the chart. By creating the table of contents information in the place where the start identification signal is recorded, the old table of contents information can be removed by the dubbing of the program at step 2. Since the table of contents information is recorded as explained above, the TOC search and TOC deletion of Stella 7" 1251-■ can be omitted. Effects of the Invention Since the table of contents information is recorded as explained above, the present invention has the following effects. Since program numbers are re-added to all programs in order before recording the table of contents information, accurate table of contents information is created, and gaps 9 such as discrepancies between the table of contents information and the actual contents of the 10 durams occur. Also, when recording new table of contents information, first delete the old table of contents information, then re-add program numbers to all programs in order, and then create a new table of contents. Even if the operation stops due to a power outage while renumbering, there is no risk of incorrect song selection due to discrepancies between the recorded program content and the table of contents information. Since the program start identification signal closest to the beginning of the tape is recorded at the location where the program start identification signal is recorded, the table of contents information can be searched in four hours. This eliminates the need for special operations to search for table of contents information.

[Brief explanation of the drawing]

FIG. 1 shows the system configuration of the present invention, and FIG. 2 shows the tape 7.
Figure showing t-mout, pII, Figure 3, @Figure 4. Figure 5 shows 7# of the subcode recorded in the subcode area.
-Ma? ) (2), Figure 6 is a diagram showing information recorded on the tape, Figures 7 and 8 are flowcharts explaining the invention in detail, Figures 9 and 1O are FIG. 3 is a diagram for explaining the flow of recording table of contents information.

Claims (3)

[Claims] (1) A plurality of programs are recorded on a magnetic tape to which a program number that changes for each piece of data that is completed in content is recorded, and the absolute time from the start end of the magnetic tape at the start position of the plurality of programs and the program A method for recording table of contents information consisting of a number and a table of contents information, characterized in that the table of contents information is recorded after program numbers are re-added to all recorded programs in order from the beginning of the tape. Method. (2) A plurality of programs are recorded on a magnetic tape to which a program number that changes for each piece of data is recorded, and the absolute time from the start end of the magnetic tape at the start position of the plurality of programs, and the program In the method for recording table of contents information consisting of numbers, the presence or absence of already recorded table of contents information is detected, and if the already recorded table of contents information exists, the previously recorded information is erased and all recorded programs are The table of contents information recording method is characterized in that the table of contents information is recorded after program numbers are re-added sequentially from the beginning of the tape. (3) A plurality of programs are recorded on the magnetic tape with a program number that changes for each piece of data that is completed in content, and a program start identification signal is recorded over a predetermined range from the start position of the plurality of programs. In the method for recording table of contents information consisting of the absolute time from the start end of the magnetic tape at the start position of the plurality of programs and the program number, the table of contents information is recorded in the program number recorded at the start end of the magnetic tape. A table of contents information recording method, characterized in that the table of contents information is recorded in a predetermined range where the start identification signal is recorded.