JPH0258786A - Method for recording index information of rotary head type digital audio tape recorder - Google Patents

Abstract

PURPOSE:To accurately perform program searching operations, etc., by utilizing index information by rewinding a tape to the leading edge immediately after program renumbering is performed to all recorded programs from the leading edge of the tape and re-recording the index information in the lead-in area of the tape. CONSTITUTION:Immediately after program renumbering is performed to all recorded programs from the leading edge of a tape, the tape is rewound to the leading edge and index information is re-recorded in the lead-in area of the tape. By performing the program renumbering which accurately re-records (post-records) the numbers of programs on the tape in such way, the programs can be post-recorded accurately and, at the same time, the index information (TOC) which indicates the leading position, etc., of a program in absolute recording time from the leading edge can be re-recorded surely.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a method for recording table of contents information of a rotary head digital audio tape recorder C (hereinafter referred to as R-DAT), and in particular a method for recording program numbers in order from the beginning of the tape. This invention relates to a recording method for re-recording the table of contents immediately after performing a so-called renumbering.

(B) Prior art The system configuration of a general R-DAT is shown in FIG. 3 and will be described. In the figure, (1) is an input terminal into which an analog audio signal is input, and (2) is an input terminal that converts this audio signal into a digital signal that has undergone interleaving, time compression, etc.
(3) is a servo signal generation circuit that generates servo signals (i.e., pilot signals, sync signals, etc.) for tracking control; (4)
(1) is a star for high-speed search) A subcode signal generation circuit that generates subcode signals such as track number and performance time information (hereinafter referred to as P time) together with (5) is a subcode signal generation circuit for each track of the tape. A switch circuit that is selectively switched at a predetermined timing to record digitally converted audio signals, servo signals, and subcode signals in the information recording area, tracking area, and subcode area to be formed;
6) is a recording amplifier, (7) is a rotary transformer of a rotating head cylinder that supplies the output from the recording amplifier (6) to two recording/reproducing rotating heads (8) 180 degrees apart;
) is a reproducing amplifier, and (10) is the output from the reproducing amplifier (9), which uses a PLL etc. to generate a clock from the data, converts it into a digital signal, and then converts it into an analog signal (P
The digital signal processing circuit (01) for CMfi tone) is an output terminal from which the original analog audio signal is output. f
13 is a servo circuit that extracts a servo signal from the output of the reproducing amplifier (9) for tracking control and generates a tracking error signal; 03 is a servo circuit that extracts a subcode signal from the output of the reproducing amplifier (9) and detects the start ID. This is a subcode processing circuit that reads P time, etc.

A take-up motor (15) directly drives the take-up reel shaft, and a supply motor (15) directly drives the supply reel shaft.
J-le motor, a minus motor drive circuit, 0η (18
) is a cylinder motor and its motor drive circuit, (191
(201 is a capstan motor and its motor drive circuit. And (21) is each motor f141 (
151 (17109) is a control circuit that controls drive/stop, rotational speed, rotational direction, etc., and is configured by a microcomputer i. ■ is a tape wrapped 90' around the rotating head cylinder.

Therefore, during recording, first, the audio signal input to the hexagonal terminal (1) is converted into a digital signal by the digital signal processing circuit (2+tetidigital signal), and then the servo signal (pilot signal, sync signal, etc.) from the servo signal generation circuit (3) is output. ) and the subcode signal (start ID, track number, P time) generated by the subcode generation circuit (4) and the recording amplifier (
6). And this recording amplifier (6) comes out from the rotary transformer (7) of the rotating head cylinder.
The recorded data is sent to the recording/reproducing rotary head (8) and recorded on the tape. At this time, the fourth
A track pattern as shown in the figure is formed, with an information recording area (P) in the center of each track, and tracking areas (Ts) (Te) and subcode areas (Ss) (Se) on both sides. They will be formed respectively.

Next, during playback, the various signals recorded on the tape are read by the recording/playback rotary head (8), and then sent to the playback amplifier (
9). The output of this reproducing amplifier (9) is then converted to a digital signal by creating a clock from the data using a PLL or the like in a digital signal processing circuit (IQI), which is then converted to an analog signal, and becomes the original audio signal to be sent to the output terminal. (It will be output from 111.

Furthermore, the output of this reproducing amplifier (9) is sent to the servo circuit 02, which extracts a servo signal for tracking control to generate a tracking error signal, which is sent to the motor drive circuit (■) for capacitor control. Stun motor (1α
is under control. In addition, the output of the reproduction amplifier (9) is also sent to the subcode processing circuit (131), where the subcode signal is extracted, the track number, time information, etc. are read, and sent to the display section through the control circuit +21+. Displays the song number and time.

The table of contents information recorded in the subcode area (Ss) (Se) is generally a TOC (Table of Contents).
ents), which indicates the relationship between the absolute time indicating the cumulative time from the beginning of the tape and the program number, and is recorded in the lead-in area or the door area shown in Figure 2, and its TOC is the program number. The beginning positions of the first, second, third, etc. songs are recorded in absolute time, so by using that TOC, you can perform high-speed searches such as cueing accurately and quickly, which is very convenient. It is something.

Regarding the technology using TOC, please refer to Japanese Patent Application Laid-Open No. 1986-12.
There is a technique disclosed in Publication No. 3078 (G11B 27/10), and this technology
After loading, the TOC is searched and the TOC is read.

(c) Problems to be solved by the invention However, with R-DAT, it is possible to repeatedly perform recording and reproduction on a single magnetic tape, and subcode information used for high-speed searches etc. It is also possible to perform so-called sub-cord recording, which rewrites the previously recorded table of contents information, which differs from the track number and time information on the actual tape, reducing the reliability of high-speed search operations using that table of contents information. A problem had arisen.

(b) Means for solving the problem The accumulated elapsed time from the beginning of the magnetic tape is recorded in the lead-in area at the beginning of the tape where multiple programs with program numbers are recorded on the magnetic tape that is helically scanned by a rotating head. In a method for recording table of contents information consisting of an absolute time indicating a program number and the program number.

R-DAT table of contents information recording that rewinds all recorded programs to the beginning of the tape and re-records the table of contents information in the lead-in area immediately after performing so-called renumbering, in which program numbers are sequentially renumbered from the beginning of the tape. Suggest a method.

(E) Effect According to the table of contents information recording method of the present invention, the table of contents information in the lead-in area can be automatically re-recorded immediately after performing the renumbering operation.

(F) Embodiment An embodiment of the present invention will be described with reference to the flowchart of FIG. The system configuration is the same as the conventional one, so its explanation will be omitted.

If you manually specify the renumber using the operation keys,
Control circuit (microcomputer) (2D reset (step 1)
be done. [Program number CP number] is 1, absolute time (A time) is 0:00:OO]. Next, the reel motor starts rotating at high speed by the microcontroller), and a high-speed search for the start ID (approximately 2
00x speed) (step 2).

Then, it stops at the same time as it detects the rising edge of star) ID.
Step 3) Do. Search for rewinding the overrun portion (
-8 times the speed) (step 4), latches the A time at the beginning of the song, and detects the fall of the star ID and stops (step 5). Thereafter, the reproduced P number (Ps) is compared with the P number (Pe) counted by the microcomputer (21).

If the P numbers match in the above step, the A time at the beginning of the song and the P number are stored in the memory in the microcomputer CD (step 6). In addition, if the above two P numbers do not match, the P number (Pc) counted by the microcomputer c21) is after-recorded (step 7) for a predetermined frame (300 frames), and the P number (Pc) and the song are recorded. The A time at the leading end of is stored in the memory in the microcomputer c21) (step 6).

The operations in steps 2 to 7 described above are repeated until the end mark is detected or the tape ends, and when it is determined that the end mark or tape end has been reached, rewind (rewind to the beginning of the tape in 7 mode (step 8), Next, in the playback mode (step 9), advance the tape to the position where the P number = OBB (lead-in area) is recorded, and from the leading edge of the lead-in area, read the P number and A stored in the memory of the microcomputer CD. TOC consisting of time (
The table of contents information) is read out and recorded in the lead-in area (step 10), and the process ends.

The above operation is performed by a pre-programmed control circuit (
Everything is controlled by a 21+ (microcomputer).

(G) Effects of the Invention According to the present invention, by accurately re-recording (after-recording) the program number of the program on the tape or by performing a number operation, the program number can be accurately after-recorded, and the program start position can be accurately re-recorded (after-recording). It is possible to reliably re-record table of contents information (TOC) indicating the absolute time recorded from the beginning of the tape, etc., and it is very useful to be able to perform accurate operations such as cueing using this TOC.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the table of contents information recording method of the present invention, FIG. 2 is a diagram schematically showing a subcode area on a magnetic tape, and FIG. 3 is a diagram showing the system configuration of R-DAT.
FIG. 4 is a diagram showing the tape format. (8)...OD rotation head, (T8), (Te) ・
- Tracking area, (No... PCM area, (Ss), (Se)... Subcode area, Qt... Control circuit (microcomputer), ■... Magnetic tape.

Claims (1)

[Claims] (1) Absolute time indicating cumulative elapsed time from the beginning of the magnetic tape and the programs in the lead-in area at the beginning of the tape where multiple programs to which program numbers are added are recorded on a magnetic tape that is helically scanned by a rotating head. In the method of recording table of contents information consisting of numbers, immediately after performing so-called renumbering, in which program numbers are renumbered sequentially from the beginning of the tape for all recorded programs, the program is rewound to the beginning of the tape and recorded in the lead-in area. A table of contents information recording method for a rotary head type digital audio tape recorder, characterized in that the table of contents information is re-recorded on a rotary head type digital audio tape recorder.