JPS62137756A - Music selecting device - Google Patents

Abstract

PURPOSE:To select the music with no error by recording a subcode showing the start of the music at the head part of a piece of music. CONSTITUTION:An intermusic detecting circuit 11 detects an intermusic part by the level of the music signal supplied from an input terminal 10. A microcomputer 17 monitors the output signal of the circuit 11 and a timer of the computer 17 is reset when said output signal has an H level. Then it is decided whether an intermusic flag is set or not. No intermusic flag is set when the recording of the music signal is started. Thus it is decided whether a recording operation is through or not. When the recording is through with a piece of music and an intermusic part is supplied, the timer in the computer 17 starts its counting action. Then the intermusic flag is set when the timer counting action lasts for a fixed period of time and longer. Thus a start ID is superposed on the head part of the music stored in a memory 13a and then recorded on a magnetic tape 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a music selection device, and particularly to a music selection device that can select a desired song number without error.

[Background of the invention]

Conventionally, music selection devices for tape recorders select music by detecting the magnitude of a reproduction signal.

For example, as shown in FIG. 5, a signal reproduced from a magnetic tape 1 by a magnetic head 2 is amplified by an amplification V%3, and then rectified by a rectifier circuit 4.

The comparator 5 compares it with the reference level 6, and if the output of the comparator 5 is at L (low) level, it is determined that it is between songs. When the level became low, there was a problem in that it was erroneously detected as an interval between songs.

Incidentally, as a publication disclosing a technique related to the above-mentioned conventional technique, there is Japanese Utility Model Application Publication No. 56-127986.

[Purpose of the invention]

The purpose of the present invention is to eliminate the problems of the prior art described above,
To provide a song selection device that can select songs without errors by recording subcodes during recording.

[Summary of the invention]

The present invention is characterized in that a subcode indicating the beginning of the song is superimposed and recorded at the beginning of the song.

[Embodiments of the invention]

The present invention will be explained below by way of examples. Figure 1 is D
In the figure 〇 showing a block diagram of an embodiment of the present invention suitable for use in an AT, 10 is an input terminal into which an analog music signal is input, and 11 is an inter-song detection circuit that detects the inter-song interval of the music signal. , 12 is A for converting the music signal into a digital signal.
/D converter, 13 is a signal processing LSI, 14 is a mechanical part for magnetic recording and reproduction, and 15 is a magnetic tape. In addition, 16 converts the played music signal into analog! 17 is a microcomputer (hereinafter abbreviated as microcomputer) that controls the operation of the signal processing LSI 13 and the mechanical section 14; 18 is a mechanism drive circuit; 19 is from which the reproduced music signal is output. It is an output terminal.

The signal processing LSI 13 is A/D! A memory 13a that temporarily stores the music signal converted into a digital signal by the converter 512, a register 13b that temporarily stores the subcode (from the start) output from the microcomputer 1, and an adder that adds these outputs. 13c, a switching device 3d that can be switched between recording and playback, a distribution 513e that separates the audio signal and the star 1-list from the reproduced signal, and a memory 13f that temporarily stores the separated music signals. and a register 13g that temporarily holds the star ID that has been updated for 1 minute.

It should be noted that the illustrated configuration of the signal processing LEI 113 is only related to the present invention, and circuits that perform other functions are omitted from illustration.

Next, the operation of this embodiment when recording a music signal will be explained with reference to FIGS. 1 and 2. FIG. 2 is a flowchart showing the functions of the microcomputer 17.

When recording a music signal on the magnetic tape 15, a control signal is output from the microcomputer 17 in response to a recording operation performed by an operator. As a result, the switching means 13 (L) is connected to the output side of the adder 13 c. Also, the mechanical section 14 starts driving by the control signal outputted from the mechanism drive circuit 18. As a result, the magnetic tape 15 The magnetic head becomes ready for recording.

When a music signal to be recorded is sent from the input terminal 10, the music signal is converted into a digital signal by the A/D converter 12. The music signal converted into a digital signal is temporarily stored in the memory 13a in the signal processing LSI 13, and is combined with the subcode etc. temporarily stored in the register 131) in an addition 513C. Then, the switching means 13 (L) is sent back to the magnetic head, and the magnetic tape 1
Recorded on 5.

Now, the song interval detection circuit 11 is manually operated from the input terminal 10 (
This is a circuit that detects the interval between songs based on the level of the 1m sound.
When a song interval is detected, for example, an X (low) level signal is output, and at other times, an H (/% A) level signal is output. The microcomputer 17 monitors the output signal of the inter-song detection circuit 11 (step siL) and proceeds to step S2 where the signal is at H level to reset the timer in the microcomputer 17.

Subsequently, it is determined whether the inter-song flag is sected (step 83).

When recording of the music signal is started, the inter-music flag is not set, so step 534j is NO, and the process proceeds to step B41, where it is determined whether the recording operation has ended. If this determination is negative, the process advances to step 81 and the above operations are repeated.

- When the recording of the songs is finished and one song interval is manually recorded, step 81 becomes NO and the process proceeds to step S5.

In step S5, a timer in the microcomputer 17 starts counting. When the count of the timer exceeds a predetermined time, an inter-song flag is set (step S7).

Next, the music signal for the second song came in manually.

Step S1 is YES and the timer is reset (
Step S2), step S3 is YES. Therefore, the process advances to step S8 and the subcode is obtained.

That is, the value from the start is set in the register tab. When the setting of the register 131) from the start is completed, the inter-music flag is reset (step 89).

Therefore, the start song is superimposed on the beginning of the song stored in the memo IJ l 3 a and recorded on the magnetic tape 15.0 Also, the signal detected as an inter-music by the inter-music detecting circuit 11 is a part of the music signal. If the level is lowered,
Since the detection period is generally short, it can be distinguished from actual song intervals.

FIG. 3 shows the relationship between the waveform of the output signal of the one-track detection circuit 11 and the signal recorded on the magnetic tape 4. ]
It shows how the images are superimposed.

Next, referring to FIGS. 1 and 4, the operation of selecting and reproducing a song using a tape on which a star ID is superimposed and recorded at the beginning of a song as described above will be explained. Here, FIG. 4 is a flowchart showing the functions of the microcomputer 17 at the time of music selection.

When a music selection operation is performed by an operator.

The microcomputer 17 connects the switching means 13d to the distributor 13e.
The selected song number is stored in the memory in the microcomputer 17.

The microcomputer 17 determines whether the operator has performed a fast forward search operation or a rewind search operation (step s11.812).

If it is a fast-forward search, the process advances to step 1313, and it is determined whether or not the start position has been detected (step 513). When the start ID is detected, the track number data held in a temporary storage means such as a register in the microcomputer 17 is incremented by one (step 514).
). Next, it is determined whether this music static data is equal to the music requested for reproduction (step 515), and if they are equal, reproduction is executed (step 816).

In the case of a rewind search, the process advances to step 817 and the same determination as step 813 is made. and.

When the start is detected, the first song number data is returned by one (step 818). After that, step S1.
5, the process of S16 is performed.

In this way, when playback occurs in step 816, the music signal played from the magnetic tape.

It is temporarily stored in the memo IJ 13 f, and then converted into an analog signal by the D/A converter 616 and sent to the output terminal 1.
As described above, according to this embodiment, the white band is detected based on whether or not it is detected from the start.

Even if the playback output level from the magnetic tape is low, it is possible to select songs without errors.

[Effects of the Invention] According to the present invention, since it is possible to record a sub-code for song selection (from the start) on a newly recorded tape, it is possible to record a tape on which song selection can be performed reliably. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the system configuration of an embodiment of the present invention, FIG. 2 is a flowchart showing recording production of the present invention, and FIG. 3 is a conceptual diagram of signals recorded on magnetic tape.
FIG. 4 is a flowchart showing the operation of music selection and playback of the present invention;
FIG. 5 is a block diagram of a conventional music selection device. 11... Song interval calculation circuit, 13... Signal processing LSI
. 14...Mechanical Department, 15...Magnetic Tape Agent Patent Attorney Michi Hiraki Otsutsu 2 Figure 3 Figure 5

Claims (1)

[Claims] (1) A means for detecting the presence or absence of a music signal to be recorded, a means for setting a subcode indicating the beginning of a song when a state without a music signal continues for more than a scheduled time, and a means for detecting the beginning of a song 1. A music selection device comprising: means for superimposing a sub-code; and means for magnetically recording a signal superimposed by the means.