JPH0261879A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent sound interruption from being generated in reproduction by recording a music head signal and a music number signal at positions deviated from already recorded positions ahead for a prescribed time at the time of performing after-recording. CONSTITUTION:The position of the music head signal and the music number signal are recorded being deviated from the recorded positions ahead for the prescribed time at the time of performing the after-recording of the music number signal, and also, the music number signals N and N+1 are rewritten to M and M+1. In such a way, it is possible to prevent delay from being generated between a true music head position and a start position in the reproduction at the time of performing the reproduction, thereby, the sound interruption can be prevented from occurring.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to, for example, DAT (Digital Application).
Audi.

Tape recorder) and VTR (Video
o Tape Recorder), an optical disk recording and reproducing device, a magnetic sheet recording and reproducing device, etc., and is configured to record music information, a track start signal, and a track number signal on an information recording medium such as a tape. The present invention relates to a recording/reproducing device.

[Prior Art] Fig. 2 is a signal waveform diagram showing a state in which a music information signal, a track start signal, and a track number signal are recorded on a tape, which is an information recording medium, in a DAT, which is an example of a conventional recording and reproducing device. Figure 2 (a) shows the time transition of the WJJ of two music information signals (MSI) and (MS2) to be recorded on the tape, and Figure 2 (b) shows the time transition of the WJJ of the two music information signals (MSI) to be recorded on the tape, and Figure 2 (b) shows the time transition of the WJJ of the two music information signals (MSI) to be recorded on the tape. Along with the music information signals (131) and (MS2) shown above, a track start signal recorded on the tape is shown, and CC,) in the figure is a track number signal recorded on the tape in the same way as the above track start signal. Indicates generation time.

Next, the above-mentioned DAT recording operation will be explained.

The music information signal (MSI) shown in FIG. 2(a), (MS
In 2), the beginning position of a song can be obtained by comparing the inter-note threshold level (LS) shown by the dotted line in the figure with the song volume. That is, in FIG. 2(a), the music information signal (MSI) on the left side is at the beginning of the song, and the music information signal on the right (MS2) is at the beginning of the song.

The position of the beginning of the song recognized in this way is shown in Figure 2 or (b).
), each of the above music information signals (MSI), (M
A pulse signal (PI) with a constant width as the beginning signal of S2),
(P2) is recorded on the tape. The initial change point of each of these pulse signals (PI) and (P2), that is, the rising part (
Pal) and (Pa2) are each of the above music information signals (MSI)
.

This is the beginning position of (MS2).

Furthermore, as shown in FIG. 2(c) at the same timing as the beginning position of the song, each of the music information signals (MSI)
, (MS2), the track number signals (N), (N÷1) are recorded on the tape.

Next, the reproduction operation of the music information signal recorded on the tape as described above will be explained.

Figure 3(a) shows the music information signal (
3(b) shows the beginning signal of a song generated by the music information signal (MS), and FIG. 3(c) shows the time course of the volume of the music information signal (MS) during playback. The temporal changes in volume are shown with the time axis at the beginning of the song enlarged compared to FIG. 2. As is clear from the figure, the track start position 0 detected by comparing the volume threshold level (Ls) shown by the dotted line in FIG. 3(a) with the song volume is the track start pulse signal (P). However, due to the need for circuit processing time to generate the track start pulse signal (P), the position after a delay of time (TI) from the detection of the track start position O is used as information to generate the track start pulse signal (P). Curve head pulse signal (P) with O as the rising edge (Pl)
This pulse signal (Pl) at the beginning of a song is recorded on the tape.

Then, during playback, the playback of the music information signal (MS) is started based on the detection of the song start pulse signal (P).
In this case too, due to the necessity of circuit processing time.

A time delay occurs before the music information signal (MS) is actually output. In other words, the circuit processing time required to recognize the track start pulse signal (P), and the music information is determined by canceling the prohibition state that is operated to prevent unnecessary output after recognizing the track start pulse signal (P). A delay of time (T2) occurs depending on the circuit processing time until the signal (MS) is actually output. As a result, the output position of the music information signal (MS) becomes the position shown by [F] in FIG. Compare time (T3= TI+
72).

In addition, the threshold level (tS) has a finite value, and a delay of time (T4) occurs compared to the true beginning position of the music information signal (MS), and during playback, there is a delay of time (T5=
74+73) delay occurs.

[Problem to be solved by the invention] According to the conventional recording/reproducing device configured as described above,
There is a problem in that the above-mentioned time delay occurs between the true beginning position of the song and the start position of the reproduced sound, and this causes a sound break at the beginning of the music information.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a recording and reproducing apparatus that can eliminate sound breaks at the beginning of a song when music information is reproduced.

[Means for Solving the Problems] A recording and reproducing apparatus according to the present invention is characterized in that, during after-recording, a track start signal and a track number signal are recorded while being shifted a predetermined time ahead of the already recorded position. do.

[Function] According to the present invention, during after-recording, by shifting the track start signal and track number signal forward by a predetermined time with respect to the already recorded position, the start position of the reproduced sound can be changed during playback after after-recording. This eliminates the time delay with respect to the true position of the beginning of a song, and eliminates sound breaks at the beginning of one song.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described based on the drawings.

FIG. 1 is a signal waveform diagram showing the recording state of a music information signal, a track start signal, and a track number signal on a tape in a recording/reproducing apparatus according to an embodiment of the present invention; FIG. Two music information signals (MSI) to be recorded, (M
S2) shows the time course of the volume, and (b) shows the recorded song start signal recorded on the tape, and (c) shows the recorded song start signal recorded on the tape in the same way as the above song start signal. Indicates the generation time of the song number signal.

Next, the after-recording operation will be explained.

After-recording of the track number signal is carried out, for example, when the track numbers (N), (N÷1) shown in FIG. 2(C) are to be read as (M), (M+1).

At this time, in conventional recording and reproducing devices, the contents of the song number signal are changed to (N
→M), it has just been rewritten as (N+1→M+1). In contrast, in this embodiment, during after-recording of the track number signal, the positions of the track start signal shown in FIG. 1(b) and the track number signal shown in FIG. 1(c) are adjusted relative to the recorded nail position. Shift forward by time (T6) and record the contents of one song number (N-+M), (N middle 1 → To 1)
). At this time, the recorded track beginning pulse signals (PI) and (P2) shown by the virtual lines in FIGS. 1(b) and (c)
and erase the track number signal.

By setting the forward shift time (T6) for the above-mentioned nail position to 'r6=75 (=TI+72+T4), the gap between the true track beginning position and the playback start position is There will be no time delay or 0
It is possible to prevent sound interruptions at the beginning of one song.

Note that the above-mentioned shift time (T6) is practically selected to be about 1 second.

Further, in the above embodiment, the case where the present invention is applied to a DAT has been described, but the same effects as in the above embodiment can be obtained even if the present invention is applied to a VTR, an optical disk recording and reproducing device, and a magnetic sheet recording and reproducing device.

[Effects of the Invention] As described above, according to the present invention, since the track start signal and the track number signal are recorded while being shifted forward by a predetermined time with respect to the predetermined nail position during after-recording,
This has the effect of eliminating sound breaks at the beginning of a song when searching for music information, cueing, etc., and reliably starting playback from the true beginning position of the song.

[Brief explanation of the drawing]

FIG. 1 is a signal waveform diagram showing the recording state of a music information signal 1 track start number and track number signal on a tape in a recording and reproducing apparatus according to an embodiment of the present invention, and FIG. A signal waveform diagram showing the recording state of a music information signal, a track start signal, and a track number signal on a tape. FIG. 3 is an enlarged signal diagram for explaining the operation of generating sound breaks at the beginning of a track in a conventional recording/playback device. FIG. (MSI), (MS2)...Music information signal, (PI)
, (P2)...Track start pulse signal, (T6)...Shift time. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] (1) Music information recorded on an information recording medium, a song start signal,
In a recording and reproducing apparatus configured to enable after-recording of a track start signal and a track number signal among the track number signals, the track start signal and track number signal are recorded while being shifted a predetermined time ahead of an already recorded position during the after recording. A recording/reproducing device characterized in that it is configured as follows.