JPH0767078A - Audio / video playback device - Google Patents

Abstract

(57) [Summary] [Purpose] To enable fine variable speed reproduction of video with a simple configuration in an audio reproduction system such as a karaoke reproduction device. [Structure] Playback means 2 for playing back audio data recorded on a recording medium 1 and video data accompanying the audio data
8 and the control means 4 for controlling the reproduction speed in the reproduction means 2-8, and the video data reproduced by the reproduction means 2-8 under the control of the control means 4 in the memories 11, 12, 1
When the reproduction speed changes from the normal speed under the control of the control means 4, the memory 11 provided in the demodulation means 9 , 12 and 13 are controlled to be corrected by controlling the write timing or the read timing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio / video reproducing apparatus suitable for application to a karaoke reproducing apparatus using a digital data recording disk called a CD (compact disk), and particularly for controlling the reproducing speed. Regarding technology.

[0002]

2. Description of the Related Art Conventionally, a karaoke reproducing apparatus (that is, an accompaniment sound of a song is reproduced and a sound input from a microphone is mixed by using a compact digital data recording disk having a diameter of about 12 cm, which is called a CD (compact disk). Various devices are being developed. In this case, in the case of what is usually called a CD, only a maximum of about 74 minutes of audio data is recorded as main digital data on one disc, but in a karaoke reproducing device, images such as lyrics are reproduced. It is more convenient to display it according to the voice. Therefore, the CD used for karaoke
In some cases, there is an additional recording area called a subcode in which video data of a still image for displaying lyrics is recorded.

On the other hand, since a moving image can display a more complicated image than a still image, a video recording disc using a relatively large disc (for example, a diameter of about 30 cm) called a video disc was used. Various karaoke playback devices have been put to practical use. However, since the video disc has a large diameter, it has a large storage space and has a disadvantage that it can be used only when the karaoke device has a sufficient installation space.

In order to solve these inconveniences, ISO
A coding system called MPEG1 system standardized by (International Organization for Standardization) was applied to develop a compact disc capable of recording long-time audio data and moving image data. In recording by this method, sub-band division, bit allocation for each divided band, etc. are performed, digital audio data is compressed to a fraction (for example, 1/5) and recorded, and this audio data and time division are used. , DCT or the like is used to record digital moving image data highly efficient compressed to several tens to several hundreds, for example, a CD.
When applied to a (digital data recording disk called CD-ROM), about 74 minutes of digital audio data and moving picture digital video data can be recorded on one disk.

[0005]

By the way, in the case of a karaoke reproducing apparatus for reproducing only sound from a CD or the like,
The playback speed may be slightly different (eg ± 10 depending on the taste of the singer).
%), And the accompaniment to be reproduced is reproduced slightly slower or slightly earlier. The adjustment of the audio reproduction speed can be realized by a circuit having a relatively simple structure.

However, it is difficult to change the reproduction speed from the disc on which the video is recorded by about several percent. That is, in the case of the conventional video disc reproducing apparatus,
When the reproduction speed is greatly changed to twice or ten times the normal speed, it can be realized by thinning out a video signal read from the disc for one to several frames corresponding to the faster speed. Further, even in the case of performing slow reproduction such as 1/2 or 1/3 of the normal speed, it can be realized by repeatedly reading the video signal read from the disc for one to several frames corresponding to the slower speed. .

On the other hand, if it is attempted to finely change the reproduction speed within the range of 1% to 10% of the normal speed, complicated control is required for the conversion processing of the number of frames, etc., and expensive editing for commercial use is required. Some devices can do this, but there has never been a simple variable speed circuit that can be applied to karaoke playback devices.

Further, the conventional variable speed reproduction for changing the image reproduction speed from the video disk or the video tape is performed only for the image only, and the audio signal recorded together with the image signal is not generally reproduced during the variable speed reproduction. However, it is difficult to directly apply the variable speed reproduction technology such as the conventional video disk reproduction device to the karaoke reproduction device which is premised on the reproduction of the accompaniment sound of the music.

The present invention has been made in view of the above problems, and an object of the present invention is to enable a variable speed reproduction of an image with a simple structure in a reproduction system of this type.

[0010]

The present invention is, for example, as shown in FIG. 1, a reproducing means 2 for reproducing audio data recorded on a recording medium 1 and video data accompanying this audio data.
8 to 8, a control means 4 for controlling the reproduction speed of the reproduction means 2 to 8, and the video data reproduced by the reproduction means 2 to 8 under the control of the control means 4 are stored in the memories 11, 12 ,.
When the reproduction speed changes from the normal speed under the control of the control means 4, the memory 11 provided to the demodulation means 9 , 12 and 13 are controlled to be corrected by controlling the write timing or the read timing.

Further, in this case, the pitch of the audio data reproduced from the recording medium 1 by the reproducing means 2 to 8 is corrected by an amount corresponding to the change of the reproducing speed under the control of the control means 4. is there.

Further, in these cases, the demodulation means 9 causes M
The video data encoded by the PEG1 system is demodulated.

[0013]

According to the present invention, since the memory provided in the demodulating means for demodulating the video data is used to correct the change in the reproduction speed, a simple structure that does not require a memory dedicated to speed correction is provided. It is possible to control the fine playback speed of the video.

In this case, the audio reproduction speed and pitch are corrected in synchronization with the speed control of the video,
A signal whose speed is adjusted well for both voices is output.

Further, the memory provided in the demodulating means for demodulating the video data coded by the MPEG1 system is used to correct the speed of the video, so that the demodulating means based on the MPEG1 system is effectively utilized. .

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In this example, an optical disc (CD-R0M) on which audio data and video data (moving image) encoded by an encoding system called MPEG1 system are recorded.
It is a playback device for playing back audio and video, and is configured as a karaoke playback device. , 1 in the figure is MPE
A CD-ROM (optical disk) on which audio data and video data are recorded by the G1 system is shown.
1 is driven to rotate by a spindle motor 2. The rotation speed of the spindle motor 2 is controlled by the motor control circuit 3. In this case, since the CD-ROM 1 records data at a constant linear velocity (so-called CLV), a clock synchronized with reproduction data generated by the PLL circuit 8 described later is supplied to the motor control circuit 3, and this clock is supplied. Servo control is performed so that the frequency is constant. Furthermore, the central control unit (CPU) of this playback device
4 is supplied to the motor control circuit 3, and the motor control circuit 3 finely adjusts the rotation speed based on this command. In the fine adjustment here, the speed can be adjusted up to ± 10% based on the normal reproduction speed.

The central control unit 4 is connected to an operating unit 5 including operating keys and various types of volumes, and based on the operation of the operating unit 5, the central control unit 4 operates the CD-
Playback control from the ROM 1 is performed. In this case, the operation unit 5 is provided with a reproduction speed adjusting volume, and the central control unit 4 is controlled according to the adjustment state of the reproduction speed adjusting volume.
Supplies a speed command to the motor control circuit 3.

The reading of the data recorded in the CD-ROM 1 is performed by irradiating the optical pickup 6 with laser light, and the data (digital data) read by the optical pickup 6 is sent to the reproduction processing circuit 7. Supply. The reproduction processing circuit 7 demodulates the data recorded by the 8-14 modulation (EFM) on the disc and also extracts the data according to the format of the CD-ROM. In addition, the clock extracted from the reproduction data is supplied to the PLL circuit (phase locked loop circuit) 8
Supply to.

Then, the video data extracted from the reproduction data by the reproduction processing circuit 7 is converted into the MPEG video decoder 9
Supply to. In this MPEG system video decoder 9, M
The video data compressed and encoded by the PEG1 system is demodulated. In this case, three frame memories 11, 12, and 13 are connected to the video decoder 9, and demodulation processing is performed using these three frame memories 11, 12, and 13, and the memories 11, 12, and 13 are used. The video data demodulated from is output.

Here, the demodulation process of the MPEG system video data will be described. The MPEG system video data is subjected to a coding process in which a small amount of code such as an empty portion is small in a screen of one frame. As it is done
A process is performed in which only the difference between the previous and next frames is extracted and encoded. As an actual configuration, an I picture encoded without referring to images of other frames,
P picture coded with reference to past pictures, and B picture coded with reference to past and future pictures
Picture (this B picture does not become a predicted picture of other pictures) and three frame memories 1
The reproduced video data of each frame sequentially written in Nos. 1, 12 and 13 are referred to each other under the control of the video decoder 9 and demodulated on the memory.

The processing until the video data supplied to the MPEG video decoder 9 is written in the frame memories 11, 12 and 13 is performed in synchronization with the reproduction clock output from the PLL circuit 8.

Then, the demodulated memories 11, 12,
The video data of 13 is transferred to the first, second, and third switches 14
It is supplied to the third fixed contacts 14a, 14b, 14c. The output of the demodulated video data to the changeover switch 14 side is performed in synchronization with a clock having a stable constant frequency different from the reproduction clock output from the PLL circuit 8. In addition,
The frequency of this stable clock is the same as the reproduction clock frequency output by the PLL circuit 8 when the reproduction speed is the normal speed (1 × speed). In addition, each memory 11, 1
If the time from the writing of the video data to the reading of the video data becomes incorrect due to the different frequencies of the write clock and the read clock to the video data 2, 13, the video data of the same frame is controlled by the central controller 4. Is repeatedly read, or one frame is thinned out and read out for correction.

The movable contact 14 of the changeover switch 14
The switching of m is performed under the control of the central control unit 4 in synchronization with the demodulation by the MPEG video decoder 9, and the demodulated video data obtained at the movable contact 14m is supplied to the NTSC processing circuit 15. In the NTSC processing circuit 15, the supplied video data is converted into an analog video signal and processed to be a composite video signal conforming to the NTSC system (hereinafter simply referred to as a video signal). It is supplied to the output terminal 16. Then, it is supplied to a monitor receiver (not shown) connected to the output terminal 16 to display an image.

Also, the audio data extracted from the reproduced data by the reproduction processing circuit 7 is converted into the MPEG audio decoder 17
Supply to. In this MPEG audio decoder 17,
The audio data compressed and encoded by the MPEG1 system is demodulated. Since this MPEG audio data is coded by sub-band division, bit allocation for each divided band, etc., demodulation processing corresponding to these is performed.

Then, the demodulated voice data is supplied to the pitch control circuit 18. The pitch control circuit 18 performs a process of adjusting the pitch (pitch) of the supplied audio data based on the pitch control command supplied from the central controller 4. The pitch adjustment in this circuit is performed in synchronization with the fine adjustment of the reproduction speed by the central controller 4. That is, the pitch variation of the reproduced voice is controlled by correcting the variation of the pitch due to the variation of the reproduction speed so that the pitch of the reproduced voice does not vary even if the speed is adjusted.

Then, the voice data processed by the pitch control circuit 18 is converted into a digital / analog converter 19
And convert it into an analog audio signal. In addition, MPE
G system audio decoder 17, pitch control circuit 1
8. The digital / analog converter 19 includes a PLL circuit 8
It is processed at the timing based on the reproduction clock supplied from.

Then, the analog audio signal output from the digital / analog converter 19 is supplied to the audio processing circuit 20 and output processing such as amplification is performed. In this case, this reproducing apparatus is provided with a microphone audio input terminal 21 for connecting a microphone (not shown), and an audio signal obtained at this input terminal 21 is converted into a digital / analog converter 19 in the audio processing circuit 20. A process of mixing with the analog audio signal output by the.

Then, the analog audio signal subjected to the processing such as amplification and mixing is supplied to the audio signal output terminal 22. Then, sound is reproduced from a speaker connected to the output terminal 22 via a power amplifier or the like.

Next, the reproducing operation by the karaoke reproducing apparatus having the above-mentioned structure will be described with reference to FIG.

First, a description will be given of the case where the reproduction speed is 1 × speed, that is, the normal speed. At this time,
The central control unit 4 sends a command to the motor control circuit 3 for reproduction at a normal speed, and servo control is performed so that the clock frequency supplied from the PLL circuit 8 to the motor control circuit 3 becomes a prescribed frequency. Then, in this state, the video data and audio data reproduced from the disc are demodulated by a corresponding circuit to obtain the reproduced video signal and audio signal at the video signal output terminal 16 and the audio signal output terminal 22.

Then, the frame memories 11, 12, 13 connected to the MPEG video decoder 9 at this time are connected.
Writing video data to the frame memory 11 and 1
Reading from Nos. 2 and 13 is performed in conjunction with each other at the same timing. That is, for example, as shown in A of FIG. 2, a period written in the memory 11 (section indicated by M11) and a period written in the memory 12 (section indicated by M12).
And the period written in the memory 13 (section indicated by M13) are set in order. At this time, as shown in FIG. 2B, the video data of the written frames are sequentially read out and supplied to the changeover switch 14 side with a delay of a predetermined period necessary for the demodulation processing, and reproduced from the output terminal 16. The video signal is output.

During reproduction at the normal speed, the pitch control circuit 18 does not perform pitch correction,
The reproduced voice data is reproduced at the same pitch.

Next, a description will be given of the case where the reproduction speed adjusting volume in the operation section 5 is adjusted to slightly decrease the reproduction speed (here, the reproduction speed is decreased by 10%). At this time, as shown in FIG. The writing period of 1 frame of video data to each memory (A in FIG. 3) is 10% longer than the reading period of 1 frame of video data from each memory (B in FIG. 3). Therefore, memory 11,
Each time the video data for 10 frames is written using 12 and 13 and demodulated, one of the memories 11 and 12
Alternatively, the video data of one frame from 13 is read out twice consecutively (the portion of the period a in FIG. 3B), and the correction for the slower reproduction speed is performed.

Therefore, the video signal obtained at the output terminal 16 does not change in the frame frequency itself even if the reproduction speed is slowed down, but the interpolation processing in which the video of the same content is continued once every 10 to several tens of frames. Will be done.

The processing of the audio data reproduced at this time is 10% by the pitch control circuit 18.
A process of correcting a pitch change (a pitch changes as it is) that occurs when the speed is slowed down is performed, and the output terminal 2
In the voice signal obtained in No. 2, only the speed is reduced by 10%, and the pitch does not change.

Next, a description will be given of a case where the reproduction speed adjusting volume in the operation section 5 is adjusted to slightly increase the reproduction speed (here, it is increased by 10%). At this time, as shown in FIG. The writing period of 1 frame of video data to each memory (A in FIG. 4) is 10% shorter than the reading period of 1 frame of video data from each memory (B in FIG. 4). Therefore, memory 11,
Each time the video data for 10 frames is written using 12 and 13 and demodulated, one of the memories 11 and 12
Alternatively, thinning-out processing is performed without reading out one frame of video data from 13 (the portion of the period b in FIG. 4A), and the correction for the increased reproduction speed is performed.

Therefore, in the video signal obtained at the output terminal 16, the frame frequency itself does not change even if the reproduction speed is increased, but an image in which one frame is thinned out every 10 to several tens of frames is displayed. It will be.

The processing of the audio data reproduced at this time is 10% by the pitch control circuit 18.
A process of correcting the pitch change (the pitch changes high as it is) that occurs when the speed is increased is performed, and the output terminal 2
In the voice signal obtained in No. 2, only the speed is increased by 10% and the pitch does not change.

Here, in order to simplify the explanation,
Although the order of writing to each memory and the order of reading from each memory are matched, the order in which the video data before demodulation according to the MPEG method is written to the memory does not actually match the order of reading. There are cases.

As described above, according to the karaoke reproducing apparatus of this example, when the reproducing speed is changed within a range of about ± 10%,
Both video and audio are well processed. That is, for video data, a frame memory provided in the MPEG decoder 9 is used to perform frame interpolation or thinning processing, and a simple configuration that does not require a dedicated frame memory for correcting the number of frames is used. , A properly processed video signal is output.

Since the pitch of the reproduced voice is corrected in synchronization with the processing of this video, the pitch component of the output audio signal does not change, and the speed is finely adjusted in synchronization with the video. The generated audio signal is output.

Therefore, for example, using this device, a CD
-Play back the accompaniment sound of the song recorded in ROM,
When singing by playing the video image of the lyrics recorded, it can be played at the speed of the singer's preference, and even if this speed adjustment is performed, the lyrics display timing displayed on the monitor receiver Etc. are almost the same as the accompaniment sound, and the usability as a karaoke reproducing apparatus is improved.

In the above embodiment, an optical disc (CD-RO) to which a recording system called MPEG1 system is applied.
Although the karaoke reproduction system for audio and moving images according to M) is used, the present invention can be applied to a karaoke reproduction system using another recording method or recording medium. It can also be applied to audio / video reproduction systems other than karaoke devices.

Furthermore, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various configurations can be adopted without departing from the gist of the present invention.

[0046]

According to the present invention, since the memory provided in the demodulating means for demodulating the video data is used to correct the change in the reproduction speed, a simple structure that does not require a memory dedicated for speed correction is used. , It becomes possible to control the fine reproduction speed of the image. Therefore, by applying it to, for example, a karaoke reproducing apparatus, fine adjustment of the speed of the video displayed according to the reproduced music can be realized without increasing the circuit scale.

In this case, the audio reproduction speed and pitch are corrected in synchronism with the speed control of the video, so that the video,
A good speed-adjusted signal is output for both voices. For example, when applied to a karaoke reproduction device, the speed of a reproduced video is adjusted and even if a speed change occurs in a reproduced accompaniment sound. The pitch change due to this speed change is corrected, and a signal whose speed is well controlled for both video and audio is output.

Further, the speed of the video is corrected by using the memory provided in the demodulation means for demodulating the video data coded by the MPEG1 method, so that the demodulation means based on the MPEG1 method is effectively used. .

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a circuit block according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a process using a memory according to an embodiment.

FIG. 3 is a process (10%) using a memory according to an embodiment.
It is an explanatory view showing the case where the reproduction speed is slowed down.

FIG. 4 is a diagram illustrating processing using a memory according to an embodiment (10%
It is an explanatory view showing the case where the reproduction speed is increased).

[Explanation of symbols]

 1 CD-ROM (optical disk) 2 spindle motor 3 motor control circuit 4 central control unit (CPU) 5 operation unit 7 reproduction processing circuit 8 PLL circuit 9 MPEG type video decoder 11, 12, 13 frame memory 16 video signal output terminal 17 MPEG Method Audio decoder 18 Pitch control circuit 19 Digital / analog converter 22 Audio signal output terminal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location H04N 5/92

Claims (3)

[Claims] 1. A reproducing means for reproducing audio data recorded on a recording medium and video data accompanying the audio data, a control means for controlling a reproducing speed of the reproducing means, and a control by the controlling means. And a demodulation means for demodulating the video data reproduced by the reproduction means into a video signal of a predetermined system by using a memory, and when the reproduction speed is changed from the normal speed by the control by the control means, An audio / video reproducing apparatus adapted to correct this variation by controlling the writing timing or the reading timing of the memory included in the demodulating means. 2. The audio / voice according to claim 1, wherein the pitch of the audio data reproduced from the recording medium is corrected by the reproducing means by an amount corresponding to a change in the reproducing speed under the control of the control means. Video playback device. 3. The audio / video reproducing apparatus according to claim 1 or 2, wherein the demodulating means demodulates video data encoded by the MPEG1 system.