JPH0573998A - Rewriting method for music head signal for digital recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify an operational procedure by detecting the level of an audio signal at a position where a music head display signal is detected, and recording again the music head display signal at a position where the level of the audio signal is turned to 0. CONSTITUTION:The level of the audio signal at a detected start ID position is detected (S-6), and whether or not the level is 0 is judged (S-7). When the absence of the level is judged, the music head signal is rewritten at the position, and when the presence of the level is judged, the pertinent start ID is erased (S-9), and a tape 11 is returned to the position where the level of the audio signal is turned to 0 (S-10). When the level of the audio signal is turned to 0, the tape is stopped at the position, the start ID is written again at the pertinent tape position, and a music number updated by a step S-5 is written (S-8). The entire start ID can be rewritten at the position which is not overlapped on a tape position where the presence of the audio signal is detected by repeating the above mentioned steps.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a function of detecting the beginning of a music piece based on the level of an audio signal recorded on a recording medium and a function of recording a music head display signal, such as DAT. Digital recording and reproducing device.

[0002]

2. Description of the Related Art A digital recording / reproducing apparatus having a function of detecting the beginning of a music piece based on the level of an audio signal recorded on a recording medium and recording the music piece number information, the music head display signal, etc. For example, it is well known in DAT and the like. Hereinafter, a conventional technique for DAT will be described.

That is, in DAT, a recording medium (tape)
There is a function of detecting the rising level of the audio signal recorded in (1) and automatically writing (recording) a music head display signal (start ID) and music number information in integer order at the tape position.

However, in the conventional method of detecting the rising level of the audio signal and recording the music beginning display signal at the time when the signal level rises even a little, the music beginning display signal is recorded in this way. There is a problem that the true beginning of the song is not played when the played song is cueed and played back later.

In order to solve this problem, some D
As described above, some ATs have a function of uniformly rewriting all of the music head display signals once recorded, forward by several seconds.

However, in the DAT having the above function,
In addition, the following other problems may occur.
In other words, if the function for automatically detecting the rising level of the audio signal and automatically recording the beginning-of-music display signal is actually operated, there will be a mistake in detecting the beginning of the song among many songs. In some cases, the beginning of the track display signal may remain unrecorded, and in that case, the user manually records the beginning of the track display signal.

That is, in the above-mentioned case, the user actually listens to the reproduced sound while watching the time before the music starts before the music starts a few seconds after the previous music ends. Although the track start display signal (start ID) is recorded on the recording medium (tape) by pressing, when the track is manually written (recorded) in this way, the track start display signal is almost accurate. It will be written a little before the true beginning of.

Therefore, in a recording medium containing a large number of music pieces, a music head display signal which is automatically written and recorded a little later than a desired position and a manual music piece which is written manually to obtain an accurate desired position. In this case, the music head display signal recorded in step 2 will be mixed, and if all the music head display signals are uniformly moved forward for a few seconds as described above, it will be manually written to the desired position accurately. The signal will be moved forward, and it will be uncomfortable, and in some cases the signal written in the correct position may be applied to the end of the previous song.

[0009]

Therefore, the present invention is
Despite the background as described above, whether the individual beginning display signals were automatically or manually written when the beginning display signals were automatically rewritten. It is an object of the present invention to provide a new method of rewriting a music beginning signal in a digital recording / reproducing apparatus capable of aligning all of the music beginning display signal to a desired position in any case. Further, if the automatic rewriting of signals is performed separately from other operations such as renumbering, the operation procedure by the user becomes complicated accordingly, and it is also an object to eliminate the complexity of that point. ..

[0010]

According to the invention of claim 1 which has solved the above-mentioned problems, in the above digital recording / reproducing apparatus, when a music head display signal is detected, the audio signal level at the position is detected and If the signal level is not zero,
At the same time as deleting the music beginning display signal at that position, return the recording medium to the position where the audio signal level becomes zero, and re-record the music beginning display signal at the position where the audio signal level becomes zero. Is the way. Also,
According to the invention of claim 2, at the same time as the renumbering operation of searching the music head display signal in order from the end of the recording medium and rewriting the music number information of the music head display signal to be detected in order of integers, This is a method of executing the method of rewriting the music head display signal described in (1).

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital recording / reproducing apparatus (hereinafter referred to as this apparatus) for carrying out the method of the present invention will be described below with reference to the drawings. FIG. 2 shows a functional block configuration of this device.
In this figure, the device (1) has an input terminal (2) for inputting an external digital signal and an analog output terminal (3), and a device for outputting an external digital signal to the input terminal (2) is A speaker or the like (not shown) is connected to the output terminal (3). (4) is a signal processing device that performs error correction of a digital signal, (5) is an RF amplifier for signal modulation, and (6) is a D / A converter. Also,
Reference numeral (7) is a microcomputer for controlling a recording / reproducing drum head (8) and a drive motor (9) such as a capstan via a servo LSI (10). The microcomputer (7) controls a magnetic tape (11). Control the recording and playback of. FIG. 3 schematically shows a signal recorded on the magnetic tape (11). Reference numeral (12) is an audio signal portion, and reference numeral (13) is a start ID (music head display signal) portion. Writing the start ID means changing the bit of the start ID portion (13) from "0" to "1". To change.

Software for implementing the method of the present invention is installed in the microcomputer (7). Next, the operation of this embodiment will be described with reference to the flowchart of FIG. That is, first, the microcomputer (1) determines whether the operation to be performed is a start ID search operation (S-
1) If YES, fast forward the tape (11) to start detection of the start ID (that is, detect the position where the bit of the start ID position is "1"), and if NO, determine whether the tape has reached the end ( S-2) If it is the end of the tape, the search operation of the start ID is ended, and if it is not the end, the process returns to step 1 (S-1) again.

The renumbering operation after detecting the start ID and the correction of the write position of the start ID are performed as follows. That is, first, it is judged whether or not the detected start ID is the first start ID after starting the tape feeding (S-3). If YES, the music number (PNO) of the start ID is set to 1 (S-4), and NO. Then, the song number (PNO) of the start ID is incremented by 1 to the previous song number to update the song number (PNO) in an integer order (S-5). (At this point, the song number information is only stored in the microcomputer (7) and is not written on the tape (11)).

Then, next, the start I detected is detected.
While detecting the audio signal level at the D position (S-6), whether the level is zero, that is, whether there is a level,
If there is no level (S-7), and there is no level,
Since the start ID is written in a good position that does not overlap with the audio signal, the start ID is rewritten as it is (however, in the case of this rewriting, the above step (S-
Write the song number signal updated in 5)) (S-
8) If there is a level, execute the following steps.

That is, the presence of the level means that the start ID is overlapped with the position where the audio signal is present (the position where the music is recorded) (schematically shown in FIG. 4), so the start ID is erased ( Specifically, the bit at the start ID position is reset to "0") (S-9)
At the same time, the tape (11) is rewound until the audio signal level becomes 0 (S-10). If the audio signal level becomes zero, of course, stop the tape at that position,
The start ID is written again at the tape position (specifically, the bit at the start ID position is set to "1"), and the song number (P) updated in step (S-5).
Write NO) (S-8). Therefore, when the above steps are repeated, all start IDs are rewritten to a position that does not overlap the tape position with the audio signal.

Further, since the operation shown in the above-mentioned flow chart simultaneously writes the position of the start ID at the same time as the renumbering of the music number (a function of rearranging the music numbers into an integer starting from 1), this function is also available to the user, for example. If there is one key to execute, there is an advantage that the renumbering of the song number and the rewriting of the start ID position can be done with one touch just by pressing the one key, but the above two functions are separate. It may be executable.

That is, in the above flow chart, steps (S-3), (S-4) and (S-5) are omitted, and the song number (PN) at step (S-8) is omitted.
If the rewriting of O) is omitted, the flow is such that the position of the start ID is automatically rewritten. The music number information is recorded on the tape (11) at substantially the same position as the start ID portion (13). The area on the tape in which the start ID (music head display signal) and the music number information are collectively written is called a sub data area in comparison with the area (main data area) in which the audio signal is recorded. There is. Further, in the above description, the data written in the main data area is called "audio signal", but this data may of course be data handled by a computer other than so-called music data, in which case So-called one or two pieces of music are data groups.

The present invention can also be applied to the recently developed so-called DCC. That is, the format on the DCC recording tape (11) is 9 tracks on one side as shown in FIG. 5, but in a sub data area arranged on any one or several of these tracks (T). Written start ID (starting signal)
Is corrected according to the above-mentioned flowchart.

[0019]

As is apparent from the above description, when the music head display signal (start ID) is automatically rewritten, all music head display signals are properly positioned without the inconvenience described at the beginning. Can be changed to Further, in the invention of claim 2, since the music head display signal can be rewritten at the same time as the renumbering, the operation is simple.

[Brief description of drawings]

FIG. 1 is a flowchart showing a procedure for rewriting a music head display signal in a digital recording / reproducing apparatus according to the present invention.

FIG. 2 is a functional block diagram of the digital recording / playback apparatus.

FIG. 3 is a schematic diagram showing the position of each signal on a recording medium.

FIG. 4 is a schematic diagram showing a state in which a music head display signal is written at a position having an audio signal level.

FIG. 5 is a schematic diagram showing a recording format in DCC.

[Simple explanation of symbols]

 (1) Digital recording / playback device (7) Microcomputer (8) Drum head (11) Magnetic tape (12) Audio signal part (13) Start ID part

Claims (2)

[Claims] 1. A digital recording / reproducing apparatus having a function of detecting the beginning of a music piece based on the level of an audio signal recorded on a recording medium and a function of recording a music head display signal, and detecting the music head display signal. At that time, if the audio signal level at the position is detected and the signal level is not zero, the music head display signal at the position is erased and the recording medium is returned to the position where the audio signal level becomes zero,
A rewriting method of a music beginning signal in a digital recording / reproducing apparatus, characterized in that a music beginning display signal is recorded again at a position where the audio signal level becomes zero. 2. A renumbering operation for searching for a music head display signal in order from the end of a recording medium and rewriting the music number information at the music head display signal position to be detected in order of integers. A method for rewriting a music beginning signal in a digital recording / reproducing apparatus for executing the method for rewriting a music beginning display signal described.