JPH0648632Y2 - Disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a disc reproducing apparatus suitable for use in a so-called karaoke apparatus.

[Conventional technology]

Recently, karaoke devices using video discs have become popular. When the video disc is used, when the reproduction is started from the beginning of the music, the reproduction start position can be promptly detected by searching for the chapter number or the like corresponding to each music.

Also, in case you want to return to the middle of the song and start playback,
A fast rewind key is provided. When the fast-reverse key is pressed, the pickup jumps back one track at a time, so that it is possible to return to a desired reproduction position while watching the reproduction screen.

[Problems to be solved by the device]

However, a device that causes the pickup to jump back by one track or by a predetermined number of tracks takes time to return to a target playback position when the return speed is slowed down, and when the speed is too fast, the target position is passed, so that the operation is not possible. There was a problem that it took time to get used to it.

This becomes more remarkable in the case of a CLV disc having a constant linear velocity, as compared with a CAV disc having a constant angular velocity.

Therefore, a special key is provided only for re-singing, and when the key is operated, a certain time (for example, 5
Some devices have been designed to return to the previous playback position.

However, even if the reproduction position is returned for a certain period of time in this way, it is not always the breath position of the song, and in that case, the reproduction position needs to be further returned. Such an operation has to be repeated, which is inconvenient when practicing to sing from the desired breath position.

The present invention has been made in view of such a situation, and is capable of promptly returning to a desired breath position.

[Means for Solving the Problems]

The disc reproducing apparatus according to claim 1 reproduces a disc on which audio signals of at least two channels are recorded, and detects silent portions of two-channel audio signals output by the reproducing means. Means and reading means for reading the reproducing position on the disc by the reproducing means,
The storage device includes a storage unit that stores the reproduction position at the timing when the silent portion is detected, and a control unit that moves the reproduction unit to the reproduction position stored in the storage unit when a predetermined command is issued.

The disc reproducing apparatus according to claim 2 is a reproducing unit for reproducing a disc on which audio signals of at least two channels are recorded, and a silent portion detecting unit for detecting a silent portion of a two-channel audio signal output by the reproducing unit. Means and reading means for reading the reproducing position on the disc by the reproducing means,
By repeating the operation of sequentially storing the playback position at the timing when the silent portion is detected, every time the silent portion is detected,
A storage unit that stores a plurality of reproduction positions and sequentially outputs the latest reproduction position when a predetermined command is input.

[Operation] In the disc reproducing apparatus according to the first aspect, since the reproduction position of the silent portion is stored, the reproduction position can be quickly returned to the silent portion (breath position).

Further, in the disc reproducing apparatus according to claim 2,
A plurality of reproduction positions of the silent portions detected during reproduction are stored, and when a predetermined command is input, they are sequentially read from the latest one, so that the operability is further improved.

〔Example〕

FIG. 1 is a block diagram showing the construction of an embodiment of a disc reproducing apparatus according to the present invention.

When a predetermined one of the keys 14 is operated to instruct reproduction, a control circuit 12 (control means) including a microcomputer controls the drive circuit 2 to rotate the video disc 1 (disc) and the pickup 3 The (playback means) is moved to a predetermined position to start playback. The pickup 3 demodulates a signal reproduced from the disc 1 into a demodulation circuit 4
Output to and demodulate. Demodulation circuit 4
The audio signal of the first channel is output to the speaker 7 via the amplifier 5, and the audio signal of the second channel is output to the speaker 8 via the amplifier 6. The demodulated video signal is output to the CRT 10 via the amplifier 9 and displayed.

On the other hand, the code signal such as the track number inserted in the vertical blanking interval of the video signal is read by the reading circuit 11 (reading means).
Are supplied and read. The reading circuit 11 outputs the reading result to the control circuit 12.

The audio signals of the first channel and the second channel are also supplied to the subtraction circuit 21.

In the subtraction circuit 21, the operational amplifier 22 serves as a non-inverting amplifier, and the resistors 24 and 25 and the operational amplifier 27 serve as an inverting amplifier.
Each is configured. The outputs of the non-inverting amplifier and the inverting amplifier are added by the adder circuit including the resistors 23 and 26 and the operational amplifier 28.

Since the audio signal of the first channel is input to the inverting amplifier and the audio signal of the second channel is input to the non-inverting amplifier, the audio signal of the first channel is eventually subtracted from the audio signal of the second channel. become.

When the left accompaniment signal is L, the right accompaniment signal is R, the guide melody is M, and the singer's song (vocal) is V, L + R + M is L + R + M for the audio signal of the first channel, and L + R + M + V is for the audio signal of the second channel. Each is included. Therefore, the operational amplifier 28 outputs the vocal signal V.

This vocal signal V is supplied to the bandpass filter 32 and the resistor 3
Schmitt trigger circuit 33 consisting of 5,36 and operational amplifier 34,
And a silent part detection circuit 31 (silent part detection means) including a mono-multivibrator (MM) 37 having a resistor 38 and a capacitor 39.

The bandpass filter 32 extracts only a vocal signal having a frequency of 100 Hz to 10 KHz, for example, and removes unnecessary components. The output of the bandpass filter 32 is input to the Schmitt trigger circuit 33, and a small level noise component is removed.
The vocal signal from which the noise component has been removed triggers the mono multivibrator 37.

The mono-multivibrator 37 is of a retriggerable type, and the time constant set by the resistor 38 and the capacitor 39 is set to an appropriate time (for example, 1 second) to detect a vocal breath. ing.

As a result, the mono-multivibrator 37 continues to be triggered in the portion (sound portion) where the vibration of the human voice exists, so that its output Q becomes H level and in the breath portion (silent portion) becomes L level.

The control circuit 12 monitors the output of the mono multivibrator 37, and when the output becomes L level, the track number which is one second before the track number output by the reading circuit 11 at that time is stored in the stack memory 13 ( (Storage means). In the case of this embodiment, the stack memory 13 has five depths (addresses), and can store a total of five sequentially input track numbers. When six or more track numbers are input, the old data previously input is sequentially erased and the latest data is sequentially stored.
Therefore, in the stack memory 13, the past breath position closest to the playback position currently being played by the pickup 3 is 5
Individuals will always be remembered.

When a predetermined one of the keys 14 is operated and the re-sending is commanded, the control circuit 12 interrupts the continuous reproduction, and the stack memory
The latest data stored in 13 is read, the drive circuit 2 is controlled, the pickup 3 is moved to the position of the track number, and the reproduction is restarted from there. Key 14 is 2
When operated twice, the latest data is read second and the pickup 3 is moved to that position.

That is, the stack memory 13 has a FILO (First In Last
Out) type.

The above operation is shown in a flowchart in FIG.

That is, when a silent portion is detected, an address that is one second before the current address (track number) is stored in the stack memory 13 (steps S1 and S2). This operation is repeated until it is commanded to sing again (step S3).
When the re-singing is instructed, the reproduction position is moved to the latest storage address position, and the reproduction is started from there. When the address is not stored in the stack memory 13, the reproduction is continued as it is (step S4).

It should be noted that the address one second before the current address is stored in the stack memory 13 because it takes one second for the mono-multivibrator 37 to detect a silent portion, and therefore this is dealt with.

[Advantage of the Invention] As described above, according to the disc reproducing apparatus of the first aspect, the reproduction position of the silent portion is stored, and when a predetermined command is issued, reproduction is performed from the reproduction position. As a result, it becomes possible to sing again quickly from the breath position.

Further, according to the disc reproducing apparatus of the second aspect, the operation of detecting the reproducing position of the silent portion is repeated, a plurality of reproducing positions are stored and sequentially read from the latest reproducing position. By controlling the number of times or the like, it becomes possible to quickly return even at the breathing position long before, and the operability is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the construction of an embodiment of the disc reproducing apparatus of the present invention, and FIG. 2 is a flow chart for explaining the operation thereof. 1 ... Video disc (disc), 3 ... Pickup (playback means), 11 ... Reading circuit (reading means), 12 ...
Control circuit (control means), 13 ... Stack memory (storage means), 21 ... Subtraction circuit, 31 ... Silent portion detection circuit (silent portion detection means).

Claims (2)

[Scope of utility model registration request] 1. A reproducing means for reproducing a disc on which audio signals of at least two channels are recorded, a silent portion detecting means for detecting a silent portion of a two-channel audio signal outputted by the reproducing means, and the reproducing operation. Reading means for reading the reproduction position on the disk by means, storage means for storing the reproduction position at the timing when the silent portion is detected, and when a predetermined command is issued, the reproduction means is stored in the storage means. A disc reproducing apparatus comprising: a control unit for moving the stored reproducing position. 2. A reproducing means for reproducing a disc on which audio signals of at least two channels are recorded, a silent portion detecting means for detecting a silent portion of a two-channel audio signal outputted by the reproducing means, and the reproducing operation. Reading means for reading the reproduction position on the disk by means, and a plurality of the reproduction positions by repeating the operation of sequentially storing the reproduction position at the timing when the silent part is detected, each time the silent part is detected. And a storage unit for sequentially outputting the latest reproduction position when a predetermined command is input.