JPH0214449A - Method for rewriting start id for dat device - Google Patents

Abstract

PURPOSE:To correctly normalize the recording position of a start ID in a music head position or foreground by detecting the music head in the vicinity of the recorded start ID to be detected and rewriting the start ID based on the music head position. CONSTITUTION:When a recorded magnetic tape is set to a DAT device and a rewrite key 17 is pushed down, a tape feed control part 20 causes a tape traveling mechanical part 21 to execute the traveling of the magnetic tape at a high speed, and a signal processing part searches the start ID by a recording/reproducing head 11. When the start ID is detected by the high-speed search, the music head in theicinity of the start ID is detected by a music sensor 22. Next, the tape feed control part 20 causes the magnetic tape to travel at a recording/reproducing speed, the start ID is recorded anew from the detected music head position, and the original start ID is erased. Thus, the recording position of the start ID can be correctly normalized in the music head position.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for rewriting a start ID in a DAT device, and particularly to a method for rewriting a start ID in a DAT device that can accurately define the recording position of the start ID at the beginning of a song. Regarding the method.

<Prior Art> DAT devices are capable of high-quality recording and playback of audio signals as well as high-speed searches for desired songs. This high-speed search is performed by detecting the reproduction of data called "start IDJ" written in the subcode using the recording/reproducing head.

This start ID has already been recorded by the software manufacturer in commercially available music tapes (soft tapes). Also, tapes other than soft tapes (user tapes)
When a user records a song from a record, CII), FM broadcast, etc., the user can record the start ID manually or automatically.

In the case of manual recording of the start ID, the start ID can be recorded by pressing the "start ID key" provided on the DAT device at the start position of the song, and in the case of automatic recording, the start ID can be recorded by pressing the "start ID key" provided on the DAT device at the starting position of the song. If you press the auto key provided on the device and enter the start ID automatic recording mode,
The start ID is automatically recorded by detecting the beginning of a song in consideration of the audio signal level and blank time.

This automatic start ID recording method is convenient when recording a plurality of songs consecutively from a CD or the like.

<Problem to be Solved by the Invention> By the way, in the conventional start ID automatic recording method, a song interval is detected when the audio signal level has been below a predetermined level for a predetermined period of time, and after the song interval is detected, the audio signal is Start I when the level is above the specified level
I am trying to record D.

However, since the automatically recorded start ID is recorded after detecting the beginning of the song, there is a problem in that it is actually recorded at a position about 0.3 seconds behind the beginning of the song.

Further, when recording the ID start ID in manual recording, it is difficult to align the start ID recording position with the beginning of the song, and there is a problem that the start ID recording position is likely to deviate from the beginning of the song.

In light of the above, an object of the present invention is to provide a start ID recording method for a DAT device that can accurately define the recording position of the start ID at the beginning of a song.

Means for Solving the Problems> FIG. 1 is a block diagram of a device that implements a start ID recording method for a DAT device according to the present invention.

In the figure, 11 is a recording/playback head, 12 is a recording/playback amplifier, 13 is a signal processing section, 14 is a main control section, 15 is a start ID key, 16 is an auto key, 17 is a rewrite key (
18 is a REC key (recording key), 19 is a play key, 20 is a tape feed control section, 21 is a tape running mechanism section, and 22 is a music sensor.

<Operation> In the present invention, when the rewrite key 17 is operated, the start ID whose ID has already been recorded is detected.

The music sensor 22 detects the beginning of a song near the ID start ID, and the start ID recording position is rewritten to the current song beginning position or to the front.

<Example> FIG. 1 is a block diagram of a device that implements the start ID recording method of a DAT device according to the present invention, FIG. 2 is a flowchart of a start ID recording process of a DAT device according to the present invention, and FIG.
Figures (a) to (c) are timing charts illustrating the start ID recording position. In FIG. 1, 11 is a recording/playback head (actually, there are two recording/playback heads called A head and B head), 12 is a recording/playback amplifier, 13 is a signal processing section, and 14 is a recording/playback head. The main control unit consists of a microcomputer, and 15 is the start ID for manual recording.
key, 16 is an auto key for automatic recording, 17 is a rewriting key for rewriting the start ID of the present invention, 18 is R
FC key (recording key), 19 is a play key, 20 is a tape feed control section, 21 is a tape running mechanism section, and 22 is a music sensor that detects between songs and the beginning of a song.

During recording, the signal processing unit 13 A/D converts the analog audio signal input from the outside, and converts the subcode (start ID, time code, program number, etc.) together with the digital audio signal obtained by the A/D conversion into an ID. etc.) through the recording/playback amplifier 12.
The signal is output to the second recording/reproducing heads IIA and IIB and recorded on the magnetic tape. In addition, the signal processing section 13
During playback, the recording/reproducing head 11 performs error detection and correction and other processing on the audio data read from the ID magnetic tape, converts it to D/A and outputs it to the outside, and furthermore, the audio data is included in the subcode. Start ID.

The signal processing unit 13 identifies time codes, program numbers, etc., reads and identifies subcodes during a search, and rewrites subcodes during after-recording.

The main control unit 14 performs REC control, play control, start ID recording control, etc. according to various key manual inputs based on a program stored in a memory (not shown), as well as start ID rewriting control according to the present invention. In addition to detecting the recorded start ID,
Detect the beginning of a song near the start ID (i.e. the frame where the song starts), and set the start ID based on the beginning position of the song at this time.
Rewrite.

The overall operation of FIG. 1 will be described below with reference to FIG. 2 and FIGS. 3(a) to 3(c).

When the recorded magnetic tape is transferred to the DAT device and the rewrite key 17 is pressed (step 101), the tape feed control section 20 causes the tape running mechanism section 21 to run the magnetic tape at high speed. The signal processing unit 13 searches the recording/reproducing head 11 for an ID start ID (step 102).
).

If the ID start ID is detected in the above-mentioned high-speed search (step 103), the music sensor 22 detects the beginning of a song near the start ID (step 104).
. An example of the positional relationship between the audio signal and the start ID at this time is shown in FIG. 3(a).

Shown in (b). As shown in the figure, the automatically recorded start ID is recorded approximately 0.3 seconds after the beginning of the song. In addition, in manual recording, the ID start ID is the track start position ID.
Because it may be recorded in the foreground (Fig. 3 (b)
(see dotted line), the beginning of a song in the start ID rewriting process of the present invention is performed before and after the start ID recording position.

Next, the tape feed control section 20 runs the magnetic tape at the recording/reproducing speed, records an ID in the after-recording function, records a new start ID from the detected track head position, and erases the original start ID (step 105). .Figure 3 (
c)), and then returns to step 102 to repeat the subsequent processing.

The following is a specific processing method of steps 104 and 105. When the start ID is detected, the main control unit 14 stops fast-forwarding the tape, rewinds the tape by a predetermined amount, and then causes the music sensor 22 to detect the beginning of the ID song while feeding the tape at a low speed (play speed). The time code or frame number at the time of detection is sent to the signal processing unit 13.
Read and store via. After that, rewind the tape by a predetermined amount, and then, while feeding the tape at low speed, check whether the time code or frame number read from the tape matches the time code or frame number stored in the memory. When they match, start ■D. Along with recording,
Delete the old start ID.

On the other hand, if the start ID is not detected as determined in step 103, the start ID search is continued until the end of the tape (step 106), and the process ends at the end of the tape.

In the above embodiment, the rewriting position of the start ID was described as the track start position, but it may be recorded in a frame one position before the track start position ID. That is, the frame number ID at the time of detecting the beginning of the song may be returned several frames before, and the start ID may be recorded immediately from there. By doing this, it is possible to play back the beginning of the song with plenty of time when searching for the beginning.

<Effects of the Invention> According to the present invention, the recorded star 1-ID is detected, and the beginning of a song near the start ID is detected.
Since the start ID is rewritten based on the track start position at this time, the start ID recording position is changed to the track start position,
Or it can be defined accurately in front.

Furthermore, since the start ID is rewritten based on the position of the beginning of the song, even if the recording position of the start ID varies due to manual recording or the like, it can be reliably recorded at a predetermined position.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a device that implements a start ID recording method for a DAT device according to the present invention, and FIG. 2 is a flowchart of a start ID recording process for a DAT device according to the present invention. 3(a) to (c) are timing charts 6 for explaining the start recording position. 11. Recording/playback head, 13. Signal processing section, 14. Main control section, 1.5. Start. ID key 16...Auto key 17...Rewrite key 18...REC key (recording key), 19...Play key 20...Tape feed control section, 21...Tape running mechanism section, 22. Music sensor.

Claims (1)

[Claims] In a start ID rewriting method for a DAT device that rewrites the recording position of a start ID, a recorded start ID is detected, and the beginning of a song near the start ID is detected, and the beginning of the current song is detected. A method for rewriting a start ID of a DAT device, characterized by rewriting a start ID based on a position.