JPH04370593A - Start id recording method of rotating head type digital audio tape recorder - Google Patents

Abstract

PURPOSE:To record a start ID section close to the beginning of a music by starting the recording of a program time initial value at a larger than a prescribed value which is larger than zero during a recording and forming a start ID section which has a previous set length. CONSTITUTION:In order to record a start ID section, which shows the beginning of a music, start recording a program time initial value at a prescribed value a which is larger than zero to form an ID section which has a previously set length. Furthermore, during a post-recording, a program time is recorded from a zero, which is just before the start ID section, to a section which corresponds to the prescribed value a. Furthermore, a portion of the start ID section, which is formed before, is erased to from a start ID section which is originated at a zero and has a previously set length. By doing this, the top portion of the start ID section approaches the beginning of a music, no sound during a high speed search of R-DAT is prevented and a precise program number and a program time are displayed at the music change during a reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to subcode information of a rotary head type digital audio tape recorder (hereinafter referred to as R-DAT), and particularly to a method for recording a start ID.

(b) Prior Art R-DAT records and reproduces signals using a helical scan method in which two rotating heads form tracks obliquely to the longitudinal direction of the tape. Each track is divided into a margin area, a subarea for recording time information and song information, a main area for recording music, and an ATF area for recording tracking signals. It is possible to rewrite the dubbing.

As shown in Figure 4, the subcode information recorded in the subarea generally includes the absolute time recorded from the top of the tape to the last recording section regardless of whether it is during a song or between songs, and the start ID, program number, etc. , program time, etc., are recorded in the first 300 frames (9 seconds) of the song.

(c) Problems to be solved by the invention The R-DAT's start ID section can be recorded using a manual function in which a "start ID" switch is pressed during recording to form a start ID section in that part, or as shown below. Some are due to the auto function.

The auto function automatically detects the start of each song during recording and records the start ID, and the detection method is to recognize the end of the previous song by level detection as shown in Figure 5. However, when the audio level reaches a predetermined level after a blank section of a predetermined length, the song is deemed to have started.

Regarding the method of automatically recording the start ID, for example, Japanese Patent Application Laid-Open No. 187491/1983 (G11B 27/
28).

Furthermore, the rise in the audio level is not necessarily steeper and takes more or less time. If the start ID detection level is set too low, it will react to noise, so it must be set to a certain level. therefore,
Since a point slightly delayed from the beginning of the song is detected, during normal playback, the program number and program time are not updated even though the next song has started.

Furthermore, when the music is played back by high-speed search, a problem arises in that the beginning of the song before the start ID section is not played back.

(d) Means for Solving the Problems The present invention is intended to solve the above problems, and is used when recording a start ID section indicating the beginning of a song using a rotary head type digital audio tape recorder. , When recording a song, record the initial value of the program time from a predetermined value (α) larger than 0 to form a start ID section with a predefined length, and at the time of after-recording, record the initial value of the program time from a predetermined value (α) larger than 0 to form a start ID section of a predetermined length; Recording the program time in a portion corresponding to the predetermined value (α) from , and erasing a part of the previously formed start ID section to form a start ID section of a specified length starting from 0. This paper proposes a start ID recording method for a rotary head type audio tape recorder characterized by the following.

Also, when recording the start ID section indicating the beginning of a song using a rotating head digital audio tape recorder, the initial value of the program time must be set to a predetermined value (α) greater than 0 when recording the song. , a start ID section having a length less than a predefined length is formed, and at the time of after-recording, a program time is recorded in a portion corresponding to the predetermined value (α) from 0 immediately before the start ID section, and This invention proposes a start ID recording method for a rotary head type digital audio tape recorder, which is characterized in that a start ID section of a specified length starting from 0 is formed following a start ID section.

(e) Effect According to the above means, the start ID section can be recorded closer to the beginning of the song.

(F) Example An example of the start ID recording method of the present invention is shown in FIG.
This will be explained with reference to the flowcharts a) and (b). First, when starting the recording of the nth track as shown in Figure 3 (a) in the auto start ID recording state, the program number is cleared to zero (step 1), the recording state is determined (step 2), and the recording If so, count up the program number (step 3) until the program number is 1.
(Step 4), and if the program number is not 1, the level detection operation is performed to detect the interval between songs (Step 5), and it detects whether the level is below the set value (Step 6). If it is less than the value, the blank length is further detected (step 7), and it is detected whether the blank length is greater than or equal to a predetermined length (step 8), and if it is greater than or equal to the predetermined length, it is determined that there is an interval between songs.

Next, the recording status is judged (step 9), and if recording is still in progress, level detection operation is started to detect the start of the next song (step 10), and when the start ID discrimination level is exceeded (step 11), the level detection operation is started (step 10). As shown in Figure 3(b), the start ID section (β) is less than the predefined length (9 seconds).
At the same time, the program number is recorded, and the program time is recorded from a predetermined value α to 9 (seconds) (step 12).

When it is determined that recording has ended in step 2 or step 9, a high-speed search is performed in the reverse direction to detect the start ID up to the beginning of the tape (step 13,
14, 15). When the start ID is detected (step 1
5) Program time (α) at the start point of the start ID section
seconds) (step 16), rewinds the tape for α seconds from the starting point of the start ID section (step 17), switches to subcode dubbing mode, and sets the program number and program time with the start ID flag set. is recorded continuously from 0 to α seconds, and is also recorded consecutively with the previously recorded start ID section (β). As a result, 9 seconds (300 frames) starting from program time 0 ) is formed (steps 18, 19).

Next, a second embodiment of the present invention will be described with reference to flowcharts shown in FIGS. 2(a) and 2(b). Steps 1 to 11 are the same as those in the first embodiment, and a description of the same parts will be omitted. It detects the interval between songs and determines the beginning of the next song, and as shown in Fig. 3(c), the predefined length (
9 seconds), the program number is recorded, and the initial value of the program is set to a predetermined value α.
Record for 9 seconds (300 frames) up to α+9 seconds.

After that, during dubbing, the start ID up to the beginning of the tape is detected in the same way as in the first embodiment, and with the start ID flag set in subcode dubbing mode, the program number and program time are set to the next start ID from 0 to α seconds. Record it so that it is continuous with the section (step 18, 1
9) Delete the program time and start ID for the section where the program time exceeds 9 seconds and ends up to α+9 seconds (
Steps 20, 21).

As a result, 9 seconds starting from program time 0 (
300 frames) can be formed.

(G) Effects of the Invention According to the method of the present invention, the beginning of the start ID section is brought closer to the beginning of the song, which prevents sound cut-offs during high-speed R-DAT searches, and accurately detects changes in songs during playback. This is extremely useful because it allows the program number and program time to be displayed.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are flowcharts showing a first embodiment of the present invention, FIGS. 2(a) and (b) are flowcharts showing a second embodiment of the present invention, and FIGS. 3(a) and (b). )(c) is a diagram schematically showing the recording state of the start ID and program time in the first and second embodiments of the present invention, FIG. 4 is a diagram schematically showing the recording state of the start ID, etc. FIG. 5 is a diagram schematically showing the recording state of the conventional start ID and program time. Applicant: Sanyo Electric Co., Ltd.

Claims (2)

[Claims] Claim 1: When recording a start ID section indicating the beginning of a song with a rotary head type digital audio tape recorder, when recording the song, the initial value of the program time is set to a predetermined value (a) larger than 0. to form a start ID section with a predefined length, and at the time of after-recording, record the program time from 0 immediately before the start ID section to the part corresponding to the predetermined value (a), and 1. A start ID recording method for a rotary head type audio tape recorder, comprising: erasing a part of a start ID section formed at 0 to form a start ID section having a specified length starting from 0. Claim 2: When recording a start ID section indicating the beginning of a song using a rotary head type digital audio tape recorder, the initial value of the program time is set to a predetermined value (a) larger than 0 when recording the song. to form a start ID section having a length less than a predetermined length, and at the time of after-recording, record a program time from 0 immediately before the start ID section to a portion corresponding to the predetermined value (a), A start ID recording method for a rotary head type digital audio tape recorder, characterized in that a start ID section of a specified length starting from 0 is formed following a previously formed start ID section.