JPH08305377A - Video and audio reproducing device - Google Patents

Abstract

PURPOSE: To provide a video and audio reproducing device displaying picture or outputting audio by detecting a timing of vocal start/end or a vocal period by discriminating whether or not a difference between the audios of two channels is within a prescribed range at the time of reproducing KARAOKE. CONSTITUTION: As an example, a vocal period detection device 18 consisting of a subtraction circuit 19 and an integration circuit 20 is provided, the subtraction circuit 19 always takes an audio signal difference between both left and right channels and the integration circuit 20 converts the difference to a DC voltage. The device is constituted so that a window comparator 21 detects whether or not the DC value is within a certain range and determines that there is only accompaniment if the value is within the range and there is a vocal if it exceeds the range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video / audio reproducing apparatus for reproducing a recording medium on which audio information is recorded, and more particularly to a karaoke apparatus using a video CD or the like.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram showing an example of a signal system in a conventional video CD. In the figure, 1 is a CD drive for reading signals from a video CD disc, and 2 is a CD drive.
C processes the signal read from the CD drive 1.
A D signal processing unit 3, 3 is an MPEG signal processing unit for decoding MPEG from a signal processed by the CD signal processing unit 2, and 4 is a CD drive 1, a CD signal processing unit 2, an MPEG signal processing unit 3, etc. for controlling the entire system. A CPU & mechanical control section 5 is an AV selector for selecting and outputting the AV signals output by the CD signal processing section 2 and the MPEG signal processing section 3 under the control of the CPU & mechanical control section 4,
A karaoke signal processing unit 6 receives the audio signal output from the AV selector 5 and performs karaoke processing.

FIG. 10 is a block diagram showing the configuration of the CD signal processing section 2 in FIG. 9, and in the figure, 7 is a CD digital signal processor (hereinafter referred to as "CD-DSP" for CD decoding the signal output from the CD drive 1). Abbreviated as "), 8 is a signal output from the CD-DSP 7 to the CD-RO.
CD-ROM decoder for M decoding, 9 is CD-RO
A memory connected to the M decoder 8 and a CD-DSP 10
An audio SW for switching between the digital audio signal output by 7 and the digital audio signal output by the MPEG signal processing unit 3 for output;
An audio DAC for D / A converting the digital audio signal output by 0, and 12 for reproducing a still image of CD-G by reading the subcode signal from the CD-DSP 7
A D-G decoder 13 is a memory connected to the CD-G decoder 12.

FIG. 11 is a block diagram showing the configuration of the karaoke signal processing section 6 in FIG. 9, in which 14 is a microphone terminal used in karaoke and 15 is a microphone terminal 14.
Microphone amplifier that amplifies the signal of
Reference numeral 5 is an echo signal processing circuit that performs processing for applying an echo to the microphone signal output by 5, and 17 is a mixing amplifier that amplifies and mixes the microphone signal output by the echo signal processing circuit 16 and the audio signal output by the AV selector 5. .

Next, the operation will be described. In FIG. 9, the CD drive 1 reproduces the disc based on the control signal output from the CPU & mechanical controller 4 and outputs the EFM signal to C.
Output to the D signal processing unit. The CD signal processing unit 2 demodulates the received EFM signal and also performs various signal processing to perform AV processing.
Outputs audio signals, video signals, etc. to the selector 5. Also, it outputs MPEG data to the MPEG signal processing unit 3 based on the control signal output from the CPU & mechanical controller 4. The MPEG signal processing unit 3 decodes the received data to reproduce the digital data before compression, D / A converts the video data, encodes it into a video signal, and outputs it to the AV selector 5. On the other hand, the audio data is output to the CD signal processing unit 2. CP
The U & mechanical control unit 4 is a unit that controls the entire system, and controls the CD drive 1 and the CD signal processing unit 2.
Control of the MPEG signal processing unit 3, control of the AV selector 5, and control of the karaoke signal processing unit 6. The AV selector 5, based on the control signal output from the CPU & mechanical control unit 4, outputs the CD signal processing unit 2 and the M signal.
The AV signal received from the PEG signal processing unit 3 is selected and output. The karaoke signal processing unit 6 performs karaoke processing such as adding an echo signal to the audio signal output by the AV selector 5, and outputs the audio signal.

In FIG. 10, the CD-DSP 7 demodulates the EFM signal output from the CD drive 1 to produce a CD-RO.
It outputs to the M decoder 8 and the audio SW 10. If the playback disc is a video CD, the CD-DSP 7
Since the FM demodulated signal is still in the CD-ROM encoded state, the CD-RO decoder 8
M decoded. At this time, the memory 8 operates as a buffer. The CD-ROM-decoded MPEG data is sent to the MPEG signal processing unit 3 according to an instruction from the CPU & mechanical control unit 4. When the reproduction disc is a CD-DA or a CD-G, the signal FM-FM demodulated by the CD-DSP 7 is already a digital audio signal and is selected and output by the audio SW 10. The audio SW 10 receives the digital audio signal output from the MPEG signal processing unit 3 in addition to the digital audio signal output from the CD-DSP 7, and outputs either one of the data based on the control signal of the CPU & mechanical controller 4. In the audio DAC 11, the digital audio signal output from the audio SW 10 is converted from a digital signal to an analog signal, and a 2-channel L / R channel signal is output. Playback disc is CD-G
In the case of, since the subcode signal is further demodulated by the CD-DSP 7, the CD-G decoder 12
-A read clock is output to the DSP 7 to read the subcode data. At that time, the memory 13 also operates as a buffer. The CD-G decoder 12 reproduces a still image as an analog video signal from the read subcode data and outputs it to the AV selector 5.

In FIG. 11, the microphone sound input from the microphone terminal 14 is amplified by the microphone amplifier 15. Then, the echo signal processing circuit 16 generates an echo signal, which is added to the original microphone sound after a delay of a fixed time and output. The mixing amplifier 17 amplifies the microphone sound output by the echo signal processing circuit 16 and the audio signal output by the AV selector 5 and then mixes and outputs them.

The CPU & mechanical control section 4 performs an operation like the algorithm shown in FIG. 12 after setting a disk for normal reproduction. First, an area called TOC is reproduced to read and store information such as the track number and start address of each track. This makes it possible to quickly perform a track jump or a cue.

[0009]

Since the conventional video CD karaoke player is constructed as described above, when the disc is reproduced to output the sound, the cue signal for starting the vocal is not recorded on the disc. Without knowing the vocal start address in advance, there is a problem that the user may miss an appropriate vocal start timing.

The video / audio reproducing device according to the present invention is made in order to solve the above-mentioned problems, and the purpose thereof is to set the magnitude of the difference between the audios of two channels in advance at the time of karaoke reproduction. It is to determine whether or not it is within the range of the specified value and detect the start and end timings of the vocal or the vocal period, and display on the screen or output the voice.

Further, while pre-reading the information recording medium at the time of reproducing the karaoke, it is judged whether or not the magnitude of the difference between the audios of the two channels is within a preset value range, and the vocal start and end timings or the vocal period. Is detected and displayed on the screen or output as voice.

The present invention has been made in order to solve the above-mentioned problem. During karaoke reproduction, the detection means consisting of a subtraction circuit, an integration circuit and a window comparator detects the vocal start and end timings or the vocal period to display a screen. Or to output a voice.

In order to solve the above problems, the detection means for detecting the period during which the subtitles are displayed when the karaoke video software is reproduced detects the vocal start and end timings or the vocal period and displays the screen. Display or audio output.

Further, the present invention has been made to solve the above-mentioned problems. During the period in which subtitles are displayed during karaoke video software playback, vocal detection is started by a detection means including a brightness level detection circuit, an integration circuit, and a comparator. It is to detect the end timing or vocal period and display on screen or output as voice.

Further, the present invention has been made to solve the above-mentioned problems. During the period in which subtitles are displayed during the reproduction of karaoke video software, the vocalization is started by the detection means including a luminance level detection circuit, a counter, and a digital comparator. It is to detect the end timing or vocal period and display on screen or output as voice.

[0016]

According to a first aspect of the present invention, there is provided a video / audio reproduction apparatus in which karaoke software in which vocals are recorded in only one of two channels of audio and a common accompaniment is recorded in both of them. In the video / audio reproducing apparatus for reproducing, the detection means for detecting whether or not the magnitude of the difference between the two channels of audio is within a preset value range.

Further, the video / audio reproducing device according to the second aspect of the present invention is a video for reproducing the karaoke software in which the vocal is recorded in only one of the two channel sounds and the monaural accompaniment common to both is recorded. The audio reproducing apparatus is provided with a detecting means for detecting whether or not the magnitude of the difference between the audios of the two channels is within a preset value while pre-reading the information medium.

Further, the video / audio reproducing apparatus according to claim 3 of the present invention reproduces the karaoke software in which the vocal is recorded in only one of the two channel sounds and the common accompaniment is recorded in both of them. The audio reproducing apparatus is provided with a vocal start / end timing detecting means including a subtracting circuit, an integrating circuit and a window comparator.

According to a fourth aspect of the present invention, there is provided a video / audio reproducing apparatus for reproducing karaoke video software in which lyrics subtitles are superimposed at the bottom of the screen, and a period in which the subtitles are displayed is set. It is provided with a detecting means for detecting.

According to a fifth aspect of the present invention, there is provided a video / audio reproducing apparatus for reproducing karaoke video software in which subtitles of lyrics are superimposed at the bottom of the screen, wherein the video signal is a digital signal. In the lower part of the screen, the number of pixels having a certain luminance level or more is counted for each pixel, and if there is more than a predetermined number, it is determined that there is a caption.

According to a sixth aspect of the present invention, there is provided a video / audio reproducing device for reproducing karaoke video software in which lyrics subtitles are superimposed at the bottom of the screen. , And a caption detection means including a comparator.

[0022]

In the video / audio reproducing apparatus according to the first aspect of the present invention, even when the karaoke software in which the cue signal indicating the timing of starting the vocal is not recorded is reproduced in advance, the difference between the audio of the two channels It is detected whether the size of is within a preset value range.

Further, in the video / audio reproducing apparatus according to the second aspect of the present invention, even when the karaoke software in which the cue signal indicating the start timing of the vocal is not recorded is reproduced in advance, the information recording medium is While prefetching, it is detected whether or not the magnitude of the difference between the voices of the two channels is within a preset value range.

Further, in the video / audio reproducing device according to the third aspect of the present invention, even when the karaoke software in which the cue signal indicating the timing of starting the vocal is not recorded is reproduced in advance, the subtracting circuit and the integrating circuit are integrated. The detection is made by a detection means including a circuit and a window comparator.

Further, in the video / audio reproducing apparatus according to the fourth aspect of the present invention, the caption is displayed even when the karaoke video software in which the cue signal indicating the timing of starting the vocal is not recorded in advance is reproduced. Detect the period of time.

Further, in the video / audio reproducing apparatus according to the fifth aspect of the present invention, the caption is displayed even when the karaoke video software in which the cue signal indicating the timing of vocal start is not recorded in advance is reproduced. The time period to be detected is detected by a caption detection unit including a brightness level detection circuit, an integration circuit, and a comparator.

Further, in the video / audio reproducing apparatus according to the sixth aspect of the present invention, the caption is displayed even when the karaoke video software in which the cue signal indicating the timing of the start of the vocal is not recorded in advance is reproduced. The period of time to be detected is detected by the caption detection means including a brightness level detection circuit, a counter, and a digital comparator.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A video CD player will be described below as an example of a video / audio reproducing device for easy understanding.
The present invention is not limited to this, and may be any device such as a VTR and a television that demodulates video and audio from an information medium and reproduces them simultaneously.

Example 1. FIG. 1 is a block diagram showing a video / audio reproducing device according to a first embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 9 represent the same or corresponding portions, and 18 is a vocal period detection unit. 2 is a block diagram showing the configuration of the vocal period detector 18 in FIG. 1, in which 19 is a subtracting circuit, 20 is an integrating circuit, and 21 is a window comparator. Subtraction circuit 19, integration circuit 2
0 and the window comparator 21 constitute an example of the vocal period detector 18.

Next, the operation will be described. Subtraction circuit 19
Always takes the difference between the left and right two-channel audio when the audio signal is reproduced. The integrating circuit 20 integrates the output of the subtracting circuit 19 and converts it into an almost DC voltage value. Window comparator 2
1 compares the output value of the integrator circuit 20 with a preset range of values centered on zero and determines whether or not the range is within that range.

If the output value of the integrating circuit 20 is within the above-mentioned fixed range, it can be determined that the left and right components are equal, that is, the accompaniment part without vocals. On the other hand, when it deviates from the predetermined range, it can be determined that the difference between the left and right components, that is, the vocal sound is reproduced.
As described above, the vocal period detection unit 18 outputs, as a binary signal, whether or not the reproduction signal is in the vocal period.

FIG. 3 shows the audio signal output, the vocal period, and the subtraction circuit 1 of the video / audio reproducing apparatus according to the first embodiment of the present invention.
FIG. 9 is a timing chart showing an example of outputs of an integration circuit 20, an integration circuit 20, and a window comparator 21. (A) is an audio R signal that includes vocals, (b) is an audio L signal that does not include vocals, (c) is an output signal of the subtraction circuit 19 which is the difference between (a) and (b), and (d) ) Is the output signal of the integrating circuit 20 that integrates (c), (e) is the output signal of the window comparator 21 that compares (d) with a certain set level, and the dotted lines indicate the beginning and end of the vocal period, respectively.

Example 2. FIG. 4 is a block diagram showing a video / audio reproducing apparatus according to the second embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 1 and 9 represent the same or corresponding portions, and 22 is an AV signal delay processing section. Similar to the first embodiment, the vocal period detection circuit 18 uses a subtraction circuit 19, an integration circuit 20 and a window comparator 21 as an example.

Next, the operation will be described. Similar to the first embodiment, the subtraction circuit 19 always takes the difference between the left and right two-channel audio when reproducing the audio signal. The integration circuit 20 is a subtraction circuit 19
The output of is integrated and converted into a DC voltage value. The window comparator 20 compares the output value of the integrator circuit 19 with a preset range of values centered on zero, and determines whether or not the range is within the range.

If the output value of the integrator circuit 20 is within the fixed range, it can be determined that the left and right components are equal, that is, the accompaniment portion without vocals. On the other hand, when it deviates from the predetermined range, it can be determined that the difference between the left and right components, that is, the vocal sound is reproduced.
As described above, the vocal period detection unit 18 outputs, as a binary signal, whether or not the reproduction signal is in the vocal period.

Simultaneously with the detection of the vocal period, the reproduced video / audio signal is delayed by the AV signal delay unit 22 before being displayed and output, so that the video / audio apparently viewed by the user is pre-read to announce the start / end of the vocal. It is possible to operate.

FIG. 5 shows the video and audio signal output reproduced from the disk and the vocal period, the timing of the video and audio signals viewed by the user, the subtraction circuit 19, and the integration circuit 2 in the video / audio reproduction apparatus according to the second embodiment of the present invention.
5 is a timing diagram showing an example of 0 and the output of the window comparator 21. FIG. (A) is a reproduced video signal output from the AV selector 5, (b) is the same R signal, and (c) is the same L signal.
Signal, (d) is the output signal of the subtraction circuit 19 that takes the difference between (b) and (c), and (e) is the integration circuit 2 that integrates (d).
0 is an output signal, (f) is an output signal of the window comparator 21 that compares (d) with a certain set level, (g) is (a) a video signal delayed by the AV signal delay processing unit 22 for a predetermined time, (h) ) Is the same R signal, (i) is the same L signal,
The dotted periods indicate the beginning and end of the vocal period, respectively.

Example 3. FIG. 6 is a block diagram showing a video / audio reproducing apparatus according to the third embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 1, 4 and 9 represent the same or corresponding portions, and 23 is a caption detection circuit.

Next, the operation will be described. The caption detection circuit 23 detects the presence or absence of captions displayed at the bottom of the screen during playback of the karaoke video software, and outputs it as a binary signal, for example.

FIG. 7A is a block diagram showing a first example of the caption detection circuit 23. In the figure, 24 is a brightness level detecting circuit, 25 is an integrating circuit, and 26 is a comparator.
In general, subtitles are displayed at a level higher than the average brightness level of the entire screen at the bottom of the screen.Therefore, if the brightness level of the part of the video signal corresponding to the bottom of the screen is detected and compared with a predetermined reference level, the presence or absence of subtitles is detected. Can be detected.

The first example of the caption detection circuit 23 detects in the state of an analog signal, but as a second example, as shown in FIG. 7b, in the state of a digital signal, each pixel in the lower part of the screen is detected. A configuration is also possible in which the number of pixels having a certain luminance level or higher is counted, and when the number of pixels is more than a predetermined number, it is determined that there is a caption. In FIG. 7b, 27
Is a digital brightness level detection circuit, 28 is a counter, 2
Reference numeral 9 is a digital comparator.

FIG. 8 shows the output of video and audio signals reproduced from the disc and the vocal period, the period during which subtitles are displayed, and the timing of the video and audio signals viewed by the user in the video / audio reproducing apparatus according to the third embodiment of the present invention. It is a timing diagram which shows an example. (A) is a reproduced video signal,
(B) is an audio R signal, (c) is an audio L signal, and (d) is a brightness level detection circuit 2 for detecting a brightness level from (a).
4 is an output signal of (4), (e) is an integration circuit 2 obtained by integrating (d).
5 is an output signal of the comparator 26 that compares (e) with a certain set level, and dotted lines indicate the start and end of the subtitle period, respectively.

[0043]

According to the video / audio reproducing apparatus according to the first aspect of the present invention, even if the karaoke software in which the cue signal indicating the timing of starting the vocal is not recorded is reproduced in advance, Since it is detected whether or not the magnitude of the voice difference is within a preset value range, there is an effect that the vocal start and end timings or the vocal period can be detected and displayed on the screen or output as voice.

According to the video / audio reproducing apparatus of the second aspect of the present invention, the information recording medium is reproduced even when the karaoke software in which the cue signal indicating the timing of starting the vocal is not recorded in advance is reproduced. While prefetching 2
Since it detects whether or not the difference between the voices of the channels is within a preset value range, the vocal start,
There is an effect that the end timing or the vocal period can be detected and screen display or voice output can be performed.

Further, according to the video / audio reproducing apparatus of the third aspect of the present invention, even when the karaoke software in which the cue signal indicating the start timing of the vocal is not recorded is reproduced in advance, the subtraction circuit, Since it is detected by the detecting means including the integrating circuit and the window comparator, there is an effect that the timing of vocal start and end or the vocal period can be detected and displayed on the screen or output as voice.

Further, according to the video / audio reproducing apparatus of the fourth aspect of the present invention, even when the karaoke video software in which the cue signal indicating the start timing of the vocal is not recorded is reproduced in advance, the subtitles are reproduced. Since the displayed period is detected, there is an effect that it is possible to detect the vocal start and end timings or the vocal period and display the result on the screen or output the sound.

Further, according to the video / audio reproducing apparatus of the fifth aspect of the present invention, even when the karaoke video software in which the cue signal indicating the start timing of the vocal is not recorded is reproduced in advance, the subtitles are reproduced. Since the displayed period is detected by the caption detection means including the luminance level detection circuit, the integration circuit, and the comparator, there is an effect that the vocal start and end timings or the vocal period can be detected and displayed on the screen or output as voice.

Further, according to the video / audio reproducing apparatus of the sixth aspect of the present invention, even when the karaoke video software in which the cue signal indicating the start timing of the vocal is not recorded is reproduced in advance, the subtitles are reproduced. Since the displayed period is detected by the caption detection means including the brightness level detection circuit, the counter, and the digital comparator, there is an effect that the vocal start and end timings or the vocal period can be detected and displayed on the screen or output as voice.

[Brief description of drawings]

FIG. 1 is a block diagram showing a video / audio reproduction device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a vocal period detection unit 18 in FIG.

FIG. 3 is a timing chart showing an example of the audio signal output and the vocal period of the video / audio reproduction device according to the first embodiment of the present invention, and the outputs of the subtraction circuit 19, the integration circuit 20, and the window comparator 21.

FIG. 4 is a block diagram showing a video / audio reproducing device according to a second embodiment of the present invention.

FIG. 5 is a video and audio signal output and a vocal period reproduced from a disc of the video and audio reproducing apparatus according to the second embodiment of the present invention, timings of video and audio signals viewed by a user, a subtracting circuit 19, an integrating circuit 20, and a window. FIG. 6 is a timing chart showing an example of the output of the comparator 21.

FIG. 6 is a block diagram showing a video / audio reproduction device according to a third embodiment of the present invention.

7 is a block diagram of a caption detection circuit 43 in FIG.

FIG. 8 is a video / audio signal output and vocal period reproduced from a disc of a video / audio reproducing apparatus and a vocal period, a period in which captions are displayed, timings of video and audio signals viewed by a user, and a subtraction circuit according to the third embodiment of the present invention. FIG. 19 is a timing diagram showing an example of outputs of 19, an integrating circuit 20, and a window comparator 21.

FIG. 9 is a block diagram showing an example of a signal system in a conventional video CD.

10 is a block diagram showing a configuration of a CD signal processing unit 2 in FIG.

11 is a block diagram showing a configuration of a karaoke signal processing unit 6 in FIG.

12 is a flowchart showing the operation contents of the CPU & mechanical controller 4 in FIG. 9 after the disk is set.

[Explanation of symbols]

1 CD drive, 2 CD signal processing unit, 3 MPEG
Signal processing unit, 4 CPU & mechanical control unit, 5 AV selector, 6 Karaoke signal processing unit, 7 Digital signal processor (CD-DSP), 8 CD-ROM decoder, 9 CD-ROM decoder Memory connected to 8, 10 audio SW , 11 audio DAC,
12 CD-G decoder, 13 CD-G decoder 12
Memory connected to, 14 microphone terminal, 15 microphone amplifier, 16 echo signal processing circuit, 17 mixing amplifier, 18 vocal period detection section, 19 subtraction circuit,
20 integrating circuit, 21 window comparator, 22
AV signal delay processing unit, 23 subtitle detection circuit, 24 luminance level detection circuit, 25 integration circuit, 26 comparator,
27 digital brightness level detection circuit, 28 counter, 29 digital comparator.

Claims (6)

[Claims] 1. A video / audio reproducing apparatus for reproducing karaoke software in which vocals are recorded in only one of the two channels of audio, and a common accompaniment is recorded in both of the channels. A video / audio reproducing device comprising a detection means for detecting whether or not is within a preset value range. 2. A video / audio reproducing apparatus for reproducing karaoke software in which vocals are recorded only in one of the two channels and a common accompaniment is recorded in both of them, and the two channels of the two channels are read while prefetching the information medium. A video / audio reproducing device comprising a detection means for detecting whether or not the difference in audio is within a preset value range. 3. A video / audio reproducing device for reproducing karaoke software in which vocals are recorded in only one of the two channels of audio, and a common accompaniment is recorded in both of them, in a subtracting circuit, an integrating circuit and a window comparator. A video / audio reproducing apparatus comprising: a vocal start / end timing detection means. 4. A video / audio reproducing apparatus for reproducing karaoke video software in which lyrics subtitles are superimposed at the bottom of the screen, and a detection unit for detecting a period during which the subtitles are displayed. Playback device. 5. A video / audio reproducing apparatus for reproducing karaoke video software in which lyrics subtitles are superimposed at the bottom of the screen, and pixels having a certain luminance level or higher for each pixel in the bottom of the screen when the video signal is a digital signal. And a caption detection unit that determines that there is caption when the number is larger than a predetermined number. 6. A video / audio reproducing device for reproducing karaoke video software in which subtitles of lyrics are superimposed at the bottom of the screen, and a caption detecting means including a brightness level detecting circuit, an integrating circuit, and a comparator is provided. Video and audio playback device.