JP2003284011A - Broadcast system and av signal reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcast system that transmits and receives AV (audio visual) signals in which the setting for time-reducing reproducing processing of audio signals is multiplexed according to the content of a program, and to provide an AV signal reproducing apparatus supporting the broadcast system. <P>SOLUTION: In a broadcast station 1, time-reducing reproduction processing parameters are used for outputting with an optimal speech speed voice in the case when time-reducing reproduction is conducted for audio signals during high speed reproduction, 1 and are multiplexed with AV signals as a time- reducing reproduction setting information at a multiplexer 12. At a AV signal record reproducing apparatus 2, a time-reducing reproduction setting unit 26 operates based on the time-reducing reproduction setting information separated by a TS (transport stream) separating unit 24, and conducts time-reducing reproduction for audio signals decoded by an MPEG extension unit 25, and outputs voice from a speaker 29. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an AV (Audio Visual
al) The present invention relates to a broadcasting system and an AV signal reproducing apparatus for transmitting and receiving signals, and particularly to a broadcasting system and an AV signal reproducing apparatus for transmitting and receiving AV signals as digital signals.

[0002]

2. Description of the Related Art Generally, VTR (Video Tape Recorde)
r), hard disk video, DVD (Digital Versati
An AV signal reproducing device such as a le disc) has a high-speed reproducing function for reproducing at N times the normal reproducing speed, in addition to the normal reproducing function. When such a high-speed playback function is used,
When the video signal is decoded, the video is reproduced at high speed by thinning out each picture. However, when the audio signal is directly decoded, it is output as a voice having a high speech speed and a high pitch.

When a voice with a high speech rate and a high pitch is output in this way, it becomes difficult to hear. Therefore, in order to make it easier to hear, a frequency component of a voice signal with a high pitch and a high speech rate is selected. By setting the state similar to that at the normal speed, time-shortening reproduction is performed in which the data is compressed and converted in the time axis direction. By performing such short time reproduction, high-speed reproduction without discomfort in audio output is performed.

As a method for such a time saving reproduction, first,
The silent part is removed from the audio information corresponding to the video of a certain scene, and the remaining audio information from which this silent part has been removed is compressed in the time axis direction, and has a length equivalent to the playback time of the video of the scene. The playback time of. That is, for example, when the double speed reproduction operation is performed, if the silent portion becomes half the reproduction time of the scene, the remaining audio information corresponding to the scene becomes half the reproduction time of the scene, so compression in the time axis direction. Is unnecessary. Also, when there is no silent portion in the scene, it is necessary to compress the audio information by 1/2 in the time axis direction. At this time, if the compression of the audio information is permitted only up to 2/3, 1/3 of the audio information will be lost.

[0005]

In such a time-saving reproduction method, various parameters such as a voice output threshold, a vacant time to be regarded as a silent portion, and an allowable voice speed are set. If the setting of is not changed by the program, the output sound may be uncomfortable. That is, in sports programs and the like, it is necessary to regard voices other than live voices as noise and treat them as silence, and unless the output threshold is raised, silence is not deleted, and voices with a high speech rate are obtained. Or information may be lost. Further, in a drama program or the like, a small voice such as a whisper is required, and therefore important conversation may be silenced unless the output threshold is lowered.

However, setting various parameters for each program on the viewer side in this way is a very complicated process. Further, since the viewer side does not know the contents of the program in advance, it is difficult to set the optimum setting for each scene. Further, it is difficult for the viewer to change the setting of the parameter in response to the voice state which changes from moment to moment in the program, because it cannot cope with the speed of the change. In addition, since the time saving reproduction is processed by analyzing only the audio data, the synchronization with the video of the scene may be out of sync. Furthermore, when the time-shortening reproduction process is performed on each of the left and right voices (L voice and R voice), there is a difference in the state of the silent time, and thus the L voice and the R voice that are output may be out of synchronization. is there.

In view of such a problem, the present invention provides a broadcasting system for transmitting and receiving an AV signal which has been set in advance for time-shortening reproduction processing of an audio signal according to the content of a program, and a broadcasting system for this broadcasting system. An object is to provide a corresponding AV signal reproducing device. Another object of the present invention is L
It is an object of the present invention to provide a broadcasting system and an AV signal reproducing device for transmitting and receiving an AV signal which has been set in advance so as to synchronize the outputs of the sound and the R sound.

[0008]

In order to achieve the above object, a broadcasting system according to a first aspect is a broadcasting system for transmitting an AV signal including an audio signal as a broadcasting signal, at a receiving side of the AV signal. When performing high-speed reproduction that is N times as fast as normal reproduction, the audio signal is subjected to time-shortening reproduction for outputting audio in a state close to the pitch during normal reproduction, and at the transmitting side of the AV signal. A parameter for the time saving reproduction which is optimum for the program included in the broadcast signal and each scene of the program is created, and the created parameter is transmitted as the time saving reproduction setting information by being superimposed on the broadcast signal.

According to such a broadcasting system, a broadcasting station transmits a broadcasting signal obtained by previously multiplexing the time saving reproduction setting information with the AV signal. Then, when such an AV signal reproducing apparatus having a recording medium receives such a broadcasting signal, the broadcasting signal is recorded on the recording medium. After that, when high-speed playback is performed on the AV signal playback device,
Based on the time-saving reproduction parameter set in the time-saving reproduction setting information, the audio signal is reproduced for time-saving, and the voice at the speech speed corresponding to the program and each scene is output. Further, the above-mentioned scene includes not only a scene set by switching screens in a program but also a scene set by switching audio states.

In such a broadcasting system, as described in claim 2, the time saving reproduction setting information is provided with the optimum parameter for each scene created at each time representing the switching of the scene. To do.

Further, as described in claim 3, the audio signal is an audio signal of a plurality of channels, and the parameter for the time saving reproduction is applied to the audio signal of each channel on the transmitting side of the AV signal. May be created and used as the time saving reproduction setting information. At this time, as described in claim 4, the time saving reproduction setting information includes the optimum parameter for each scene created for the sound of each channel for each predetermined time, and thus the predetermined time is set. Since the time saving process is reset every time, it is possible to confirm the synchronization at every predetermined time.

Further, as described in claim 5, the parameter for the time saving reproduction includes a parameter for detecting a silent portion, and the audio signal at the time of the high speed reproduction according to the length of the silent portion. The compression rate in the time direction is set to determine the speech speed. As this parameter, the output threshold for recognizing the magnitude of the level of the voice signal to make it silent and the idle time width for recognizing the length of the silent period to make a silent part Parts are detected. Further, the parameter may include the voice speed allowance for setting the voice speed allowed in each scene.

An AV signal reproducing apparatus according to a sixth aspect of the present invention includes a signal separating section for reading an AV signal including an audio signal recorded on a recording medium and separating the AV signal into various signals.
An audio signal obtained by separating the AV signal by the signal separation unit, a time-short reproduction setting unit for performing time-short reproduction for converting the sound at N-speed reproduction into a state close to the pitch at normal reproduction. In the signal reproducing device, the content for the AV signal and the parameters for the time saving reproduction most suitable for each scene of the content are recorded together with the AV signal as time saving reproduction setting information on the recording medium, and separated by the signal separating unit. The time saving reproduction setting information thus obtained is given to the control unit, the control unit sets each parameter of the time saving reproduction according to the time saving reproduction setting information, and the time saving reproduction of the time saving reproduction setting unit is performed. It is characterized by controlling the processing operation.

In such an AV signal reproducing apparatus, a broadcast signal transmitted by the above-mentioned broadcasting system is received and recorded on a recording medium, and the AV signal in the broadcast signal recorded on the recording medium is read out. The reproduction may be performed, or the AV signal previously recorded together with the time saving reproduction setting information on a recording medium such as a DVD may be read and reproduced.

Further, as described in claim 7, the time saving reproduction setting information includes the optimum parameter for each scene created at each time representing the switching of the scene, and the control unit controls the scene. When the time indicating the switching of is detected, the setting of each parameter of the time saving reproduction in the time saving reproduction setting unit may be changed.

Further, as described in claim 8, the audio signal is an audio signal of a plurality of channels, and the time saving reproduction setting information is composed of parameters for the time saving reproduction for the audio signals of the respective channels, The time saving / reproducing setting unit is provided with the same number as the number of channels to which the audio signal of each channel is given, and the control unit has the time saving / reproducing setting unit to which the audio signal of each channel is given based on the time saving reproduction setting information. The parameters for the time saving reproduction may be set for each of them.

At this time, further, as described in claim 9, the time saving reproduction setting information includes the optimum parameter for each scene created for the sound of each channel at each predetermined time. The control unit may change the setting of each parameter of the time saving reproduction in the time saving reproduction setting unit for each channel at every predetermined time.

The AV signal reproducing apparatus according to claim 10 is the AV signal reproducing apparatus according to any one of claims 6 to 9, wherein the parameter for time saving reproduction detects a silent portion. In the time reduction reproduction setting unit, the speech speed is determined by setting the compression ratio in the time direction of the audio signal during the high speed reproduction in the time reduction reproduction setting unit. To do.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION <First Embodiment> First Embodiment of the Present Invention
Embodiments will be described with reference to the drawings. Figure 1
FIG. 1 is a block diagram showing the configuration of a broadcasting system of this embodiment.

The broadcasting system shown in FIG. 1 includes a broadcasting station 1 for transmitting a digital broadcasting signal including an AV signal, and an AV signal recording / reproducing for receiving a digital broadcasting signal transmitted from the broadcasting station 1 and reproducing and outputting video and audio. And the device 2.

Then, the broadcasting station 1 MPEs the video signal and the audio signal input from a camera, a microphone or the like (not shown).
An MPEG compression unit 11 that compresses and encodes by the G2 (Moving Picture Experts Group-2) system, a multiplexer 12 that multiplexes various data as setting parameters into the compressed video signal and audio signal, and a multiplexer 12 that multiplexes the data. A modulator 13 that modulates a signal and an antenna 14 that transmits a digital broadcast signal obtained by being modulated by the modulator 13 are provided.

Further, the AV signal recording / reproducing apparatus 2 includes a broadcasting station 1
Antenna 2 for receiving digital broadcast signals transmitted from
1 and a TS (Transpor) including an AV signal by demodulating a digital broadcast signal received by the antenna 21 in a desired channel.
t Stream), a recording medium 23 for storing the TS obtained by the demodulation unit 22, and a recording medium 23.
A TS separation unit 24 that separates the read TS into a video signal and an audio signal, and an M that expands the video signal and the audio signal separated by the TS separation unit 24 by the MPEG2 method.
A PEG decompression unit 25, a time reduction reproduction setting unit 26 that sets the audio signal demodulated by the MPEG decompression unit 25 for time reduction reproduction, and a control unit 27 that controls each block in the device.
A display 28 for reproducing and displaying the video signal demodulated by the MPEG decompression unit 25, and a speaker 29 for outputting an audio signal given through the time saving reproduction setting unit 26 are provided.

As described above, when the broadcasting station 1 and the AV signal reproducing apparatus 2 in the broadcasting system of FIG. 1 are configured, in the broadcasting station 1, the video image captured by the camera is given as a video signal and the microphone is used. The collected voice is given as a voice signal. This video signal and audio signal are MPEG
When compressed by the compression unit 11, the multiplexer multiplexes the video signal and the audio signal, which are the AV signals obtained by the compression, and the program ancillary information including the setting information for the time saving reproduction which represents the setting parameter when the time saving reproduction of the audio signal is performed. 12 to multiplex.

Then, after the AV signal thus multiplexed is subjected to error correction coding in the modulator 13,
Performs digital modulation such as multi-phase modulation and quadrature amplitude modulation, superimposes it on the carrier frequency given to the broadcasting station 1,
A digital broadcast signal is transmitted from the antenna 14. The program-related information is PSI (Program Specific Informati).
on), SI (Service Information), etc., for indicating the format and various information for the video signal of the program.

In the AV signal recording / reproducing apparatus 2 in which the digital broadcast signal transmitted from the broadcasting station 1 is received by the antenna 21, the demodulation unit 22 is controlled by the control unit 27 to select the desired program and the recording medium 23. Recorded in. At this time, the digital broadcast signal received by the antenna 21 is demodulated and error-decoded after being tuned to a desired channel. Then, the TS, which is the AV signal thus obtained, is recorded in the recording medium 23.

When the TS of the program recorded on the recording medium 23 is read and reproduced as described above, when the normal reproduction is performed, the control unit 27 controls so that the time / short reproduction setting unit 26 does not perform the time / short reproduction process. To be done. Therefore, for example, when the control unit 27 is instructed to reproduce the program transmitted from the broadcasting station 1, the TS recorded on the recording medium 23 is directly read by the TS separation unit 24 and the video signal and the audio signal are reproduced. The AV signal and the program ancillary information are separated. In the present embodiment, the T obtained by the demodulation unit 22 is
Although S is given to the TS separation unit 24 after being once recorded on the recording medium 23, it may have a mechanism for giving the TS directly from the demodulation unit 22 to the TS separation unit 24.

The MPEG decompression unit 25 operates according to the separated program ancillary information to decompress and decode the video signal and the audio signal. Thereafter, the decoded video signal is given to the display 28 to display the video, and the decoded audio signal is displayed in the time saving reproduction setting unit 2
The sound is output to the speaker 29 without being processed in 6. Incidentally, when the program previously recorded in the recording medium 23 is normally reproduced, the audio signal is similarly applied to the speaker 29 without being processed by the time reduction reproduction setting section 26.

In such a broadcasting system, the operation when the program recorded by the AV signal recording / reproducing apparatus 2 is instructed to be reproduced at N times speed will be described below. First, in the broadcasting station 1, the time saving reproduction setting information included in the program ancillary information multiplexed by the multiplexer 12, as shown in FIG. Output threshold, idle time width, and speech rate tolerance. At this time, the output threshold in the setting information for short time reproduction, the free time width,
Each of the speech speed tolerances will be briefly described below.

First, the output threshold represents the threshold level of the output for determining the silent portion, and the audio signal for the audio output lower than this output threshold is regarded as the audio signal of the silent portion. The output thresholds are, for example, four levels from level 0 to level 3 in order from the lowest level, and the level corresponding to each scene is 4 levels.
It is selected and set from two levels.

When the output threshold value is set in this way, the voicing sound such as "tsu" and the voice output of the ending of the conversation become small, and when it is judged that there is no sound, the conversation may have an unnatural form. is there. In order to prevent this, a vacant time width for confirming the time width in which the silent part, which is equal to or less than the output threshold value, is set. That is, when the audio output of the audio signal is lower than the output threshold for a period longer than the idle time period, this period is recognized as a silent portion. Regarding this free time width, for example, level 0
~ There are four levels, Level 3.

Further, the speech rate tolerance represents the compression ratio that is allowed when the voice signal is compressed in the time axis direction. That is, if the speech speed is increased, it becomes difficult to hear, and in the case of an unnatural state, in order to set the speed so that the output is as natural as possible, the playback speed is slower than the playback speed. As described above, the compression ratio is set low. Regarding this speed tolerance, for example,
There are four levels from level 0 to level 3 in order from the lowest compression rate.

The TS separation unit 24 controls the control unit 27 so that the TS in which the program ancillary information including the time saving reproduction setting information is multiplexed with the AV signal is read from the recording medium 23.
Controlled by. Then, the read TS is separated into the video signal, the audio signal, and the program ancillary information by the TS separation unit 24. The separated video and audio signals are MPE
The program extension information is provided to the G decompression unit 25, and the program attached information is provided to the control unit 27. At this time, the time saving reproduction setting information included in the program ancillary information is stored in the FIFO (First
In First Out) 27a.

Then, the MPEG decompression unit 25 decompresses and decodes the video signal, and then N-picture is supplied to the display 28 so that one picture is displayed every N pictures.
Thin out one picture. Therefore, the display 28
On top of that, N times speed image display is performed. When the audio signal is decoded by the MPEG decompression unit 25, it is given to the time saving reproduction setting unit 26.

At this time, when the program ancillary information output from the TS separation unit 24 is given to the control unit 27, the FIFO2
The time saving reproduction setting information is sequentially stored in time series 7a.
Then, the control unit 27 reads the time saving reproduction setting information stored in the FIFO 27 a in accordance with the system clock similarly input to the control unit 27, and the time saving reproduction setting unit 2
Set the state of 6.

That is, the time represented by the system clock is compared with the time represented by the time stamp of the time saving reproduction setting information.
The time saving reproduction setting information stored in O27a is output to set the state of the time saving reproduction setting unit 26. The time represented by the system clock and the time stamp is the count value of the clock.

Therefore, when the time saving reproduction setting information as shown in FIG. 2 is given, when the system clock becomes 2000, the output threshold is level 0, the idle time width is level 3, and the speech speed tolerance is The state of the time saving reproduction setting unit 26 is changed so that the state corresponds to the level 3, and then,
It is held until the system clock reaches 2500. Then, when the system clock becomes 2500, the output threshold is set to level 3, the idle time width is set to level 1, and the speech speed tolerance is set to the state corresponding to level 2, and the system clock is set to 37000. Output threshold is level 3, empty time width is level 1, and speech speed tolerance is level 0
The state of the time saving reproduction setting unit 26 is updated so as to be in a state according to.

As described above, each time the value of the system clock matches the value of the time stamp, the state of the time saving reproduction setting section 26 is changed, and the state is held until it matches the value of the next time stamp. . It should be noted that in the time saving reproduction setting unit 26, the output threshold is d / 1 for the values level 0, level 1, level 2 and level 3 given by the control unit 27.
6, d / 8, d / 4, d / 2 (d represents the range width of the audio output), the idle time width is 50 msec, 10
0 msec, 200 msec, 400 msec, and the speech speed tolerance is 1x speed, 1x speed-1 + (N-1) / 3x speed,
It is assumed that the speed is set to 1 × speed to 1 + 2 (N−1) / 3 times speed, and 1 to N times speed.

Therefore, for example, the system clock is 25
When it becomes 00, the control threshold value is set by the control unit 27 so that the output threshold value is level 3, the vacant time width is level 1, and the speech speed tolerance is in the state corresponding to level 2. Therefore, the time saving reproduction setting unit 26 , The output of the audio signal given by the MPEG decompression unit 25 is compared with the output threshold value d / 2, and the period when the output is lower than d / 2 is 100
Compare with msec. Then, compression is applied so that the speed of the voice output at this time is 1 × 1 to 1 + 2 (N−1) / 3 ×.

As described above, in the time saving reproduction setting unit 26, each parameter for performing time saving reproduction is set by any one of the value level 0 to level 3 given from the control unit 27 for each time represented by the time stamp. It The time saving reproduction setting unit 26, in which the state is set for each time represented by the time stamp, compares the audio signal input from the MPEG decompression unit 25 with the output threshold value and the idle time width every predetermined time T. Then, the silent part within the predetermined time T is detected. When the silent portion t within the predetermined time T is detected, it is confirmed that the output during the remaining period T-t is voice.

Then, the compression rate for compressing the audio signal in the time axis direction is set so that the audio in the period T-t is output at the time T / N. That is, (T−t) × N /
The compression rate is set so that sound is output at T times speed.
When the compression rate is set in this way, (T−t) × N / T
It is confirmed whether or not the double speed is included in the range of the speech speed tolerance. At this time, when (T−t) × N / T double speed exceeds the speech speed tolerance, the setting is changed to the compression rate that is the highest value of the speech speed tolerance.

When the compression rate is set in this way, the audio signal of the period T-t is sequentially time-sequentially set for each time T / n based on the compression rate set in this way. Apply compression along the time axis. In this way, the audio signal compressed at the compression rate set by the time saving reproduction setting unit 26 is given to the speaker 29, and the audio is output.

That is, as shown in FIG. 3, when the sound output is recognized at the time ta, tc, and te during the time T, and the time tb, td is the silent portion, the N-times speed reproduction is performed. The compression ratio is set to (ta + tc + te) × N / T double speed. Then, at this time, when the speech speed tolerance is set to 1 to 1+ (N-1) / 3 times speed at level 1,
When (ta + tc + te) * N / T> 1+ (N-1) / 3, the compression rate of 1+ (N-1) / 3 times speed is set, and (ta + tc + te) * N / T≤1 + ( N
−1) / 3, (ta + tc + te) × N /
The compression rate at which the speed is T is set. And time ta,
The audio signals at tc and te are sequentially compressed at each time T / n, and 1+ (N-1) / 3 times speed or (ta + tc +).
te) × N / T double speed voice is output.

In the present embodiment, when the speech speed tolerance set by the time reduction playback setting unit 26 is set to a value given by the control unit 27, the playback speed at the time of N times speed playback is set. To be proportional to. That is, in the case of the double speed with respect to the level 0, the level 1, the level 2, and the level 3, the speech speed tolerance is 1 speed, 1 speed to 1+ (2-1) / 3.
Double speed, 1x speed to 1 + 2 × (2-1) / 3 times speed, and 1 to 2 times speed are set. In the case of 3 times speed, the speech speed tolerance is 1 times speed,
1x to 1+ (3-1) / 3x, 1x to 1 + 2x
(3-1) / 3 times speed and 1-3 times speed are set. However, the speech speed tolerance is not limited to the one that is proportional to the reproduction speed in this way, and the speech speed tolerance is set at a different ratio for each of the double speed, the triple speed, ... You may do so.

As described above, according to the broadcasting system of this embodiment, in the broadcasting station, for each scene in the program,
Various parameters such as an output threshold value, a vacant time width, and a speed allowance are set in advance so that the optimum time-shortening reproduction of the sound is performed when the N-times speed reproduction is performed. Then, in order for the AV signal recording / reproducing apparatus to receive and reproduce the digital broadcast signal to which the set various parameters are given as the time saving reproduction setting information, the parameters are set on the viewer side when the N speed reproduction is performed. Without doing so, it is possible to perform optimum time saving reproduction of voice.

<Second Embodiment> A second embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows an AV signal recording / reproducing apparatus used in the broadcasting system of this embodiment. In this embodiment, the broadcasting station has the same configuration as that used in the broadcasting system shown in FIG. 1, as in the first embodiment.

The AV signal recording / reproducing apparatus 2a shown in FIG. 4 has an L audio time / short reproduction setting unit 26a and an R audio time / short reproduction setting unit 2
6b and L speakers 29a and R for outputting the L and R sounds respectively from the time saving reproduction setting units 26a and 26b.
The configuration is similar to that of the AV signal recording / reproducing apparatus 2 (FIG. 1) of the first embodiment except that the speaker 29b is provided. That is, the AV signal recording / reproducing apparatus 2a of FIG.
Then, the MPEG decompression unit 25 outputs the L audio signal and the R audio signal, and the L audio signal and the R audio signal are given to the time saving reproduction setting units 26a and 26b, respectively.

In the broadcasting station 1, the time saving reproduction setting information for each of the L audio signal and the R audio signal is created,
As a part of the program ancillary information, the video signal and the audio signal are multiplexed by the multiplexer 12. As shown in FIG. 5, the time saving reproduction setting information for each of the L audio signal and the R audio signal includes a time stamp indicating a reproduction time, an output threshold value and an empty time width of the L audio signal and the R audio signal for the time stamp, and Speech speed tolerance,
The time interval Δt for confirming the synchronization between the L audio signal and the R audio signal.

At this time, unlike the first embodiment, the time stamp is represented by the time interval Δt obtained from the time saving reproduction setting information of FIG. 5 every time it is confirmed that the time stamp and the system clock match. Change the count value.
Then, until the system clock coincides with the next time stamp, in order to synchronize the L sound and the R sound at each set time interval Δt, each sound changed by the time saving reproduction setting information together with the time interval Δt. The output threshold for the signal, the idle time width, and the speech speed tolerance are reset.
The time interval Δt is a count value of the clock, like the time stamp and the system clock.

When the AV signal recording / reproducing apparatus 2a receives the digital broadcast signal in which the time saving reproduction setting information is multiplexed and the TS is recorded on the recording medium 23, it is recorded on this recording medium. Read TS and N
When instructed to perform the double speed reproduction, the time reduction reproduction setting information separated from the TS read by the TS separation unit 24 is given to the FIFO 27a of the control unit 27. And
Each time the system clock matches the time stamp, the time interval Δt counted by the system counter is changed. The system clock counts to detect the time stamp, and the system counter counts to detect the time interval Δt.

After that, the system counter displays the time interval Δt.
Every time the count value of the audio signal is counted, the output threshold value, the idle time width, and the speech speed allowance for each audio signal are
26b is output. That is, when the count value of the system clock matches the time stamp, the time interval Δt, the output threshold value for each audio signal, the idle time width, and the speech speed tolerance are changed. Then, every time the system counter counts the count value of the changed time interval Δt, the output threshold value, the vacant time width, and the speech speed tolerance for each changed audio signal are output to the time reduction reproduction setting units 26a and 26b. . At this time, since the parameters of the time saving reproduction setting units 26a and 26b are reset and the time saving reproduction is resumed at the same time, the deviation between the L sound and the R sound that occurs during the time saving reproduction is eliminated, and the L sound is canceled. And R voice synchronization.

Therefore, when the count value of the system clock coincides with the value 2000 of the time stamp, the time saving reproduction setting section 26 is set every time the system counter counts the count value 100 until the count value of the system clock reaches 2500.
The parameters of the output thresholds of a and 26b, the vacant time width, and the speech speed tolerance are reset. When the count value of the system clock coincides with the value 2500 of the time stamp, the output of the time saving reproduction setting units 26a and 26b each time the system counter counts the count value 500 until the count value of the system clock reaches 37000. The parameters of the threshold value, the vacant time width, and the speech speed tolerance are reset.

The time saving reproduction setting section 26a, 26b operates in the same manner as the time saving reproduction setting section 26 of the first embodiment. In this way, the L sound and the R sound obtained by performing the time saving reproduction are output from the speakers 29a and 29b. That is, when the time saving reproduction setting information as shown in FIG. 5 is given, the system counter is set to 2500 to 370.
During 00, the time saving reproduction setting unit 26a is set for each count value 500.
Output threshold, time width, and speech speed tolerance to level 0, level 3, and level 3, respectively, and the time saving reproduction setting unit 26b.
The output threshold, the time width, and the speech speed tolerance are reset to level 1, level 3, and level 3, respectively.

As described above, in this embodiment, at each time interval Δt set to the time given by the time stamp,
By periodically setting the parameters for the time reduction reproduction, the time reduction reproduction processing operation for the L audio signal and the R audio signal is reset to eliminate the deviation between the L audio and the R audio. At this time, each parameter is set on the side of the broadcasting station 1 to an optimum value so that the deviation is as small as possible when performing the time-shortening reproduction process on the L audio signal and the R audio signal. Also, the time interval Δt set for each time stamp is set to a value such that the difference between the L voice and the R voice is reset so that the gap between the L voice and the R voice becomes smaller than a certain value. , Is set on the broadcast station 1 side.

In each of the above embodiments, the AV signal transmitted from the broadcasting station is recorded on the recording medium, and
When the AV signal recorded on this recording medium is reproduced at N times speed, the audio signal is reproduced at a shorter time.
An AV in which a recording medium such as a DVD is installed from the outside and the AV signal recorded in the recording medium is read out.
It is also applicable to the signal reproducing device. At this time, D
On a recording medium such as a VD, time-shortening reproduction setting information for each scene is recorded in addition to the AV signal, and the time-shortening reproduction setting information is sequentially confirmed by the control unit to perform time-shortening reproduction according to each scene. . Further, the L audio and the R audio can be synchronized by using the time saving reproduction setting information for each time for synchronization.

[0055]

According to the present invention, an AV signal to which optimum parameters for time saving reproduction are given in advance for each program and each scene of the program is reproduced, so that a viewer feels uncomfortable when performing high speed reproduction. It is possible to output voice at no speech speed. Further, since the parameters for time saving reproduction are set in advance, it is not necessary for the viewer to change the parameters for time saving reproduction each time, and the complexity of the operation during high speed reproduction can be eliminated. Further, even in the same program, it is possible to set the parameters for time-saving reproduction to the optimum ones according to the scenes that change from moment to moment.

Further, by setting the parameters for time saving reproduction for a plurality of channels, it is possible to output the voice at the optimum speech speed for synchronizing the voices of the respective channels. At this time, since the parameters for time saving reproduction are reset every predetermined time, it is possible to confirm the synchronization of voices of a plurality of channels.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a broadcasting system of the present invention.

FIG. 2 is a diagram showing the contents of time saving reproduction setting information.

FIG. 3 is a diagram for explaining a time saving reproduction process.

FIG. 4 is a diagram showing an internal configuration of an AV signal recording / reproducing apparatus according to a second embodiment.

FIG. 5 is a diagram showing the contents of time saving reproduction setting information.

[Explanation of symbols]

1 broadcasting station 2 AV signal recording / reproducing apparatus 11 MPEG compression unit 12 multiplexer 13 Modulator 14 antenna 21 antenna 22 Demodulator 23 recording media 24 TS separation unit 25 MPEG decompression unit 26 hour shortening playback setting section 27 Control unit 28 display 29 speakers

Claims (10)

[Claims] 1. In a broadcasting system for transmitting an AV signal including an audio signal as a broadcast signal, when the high-speed reproduction at a reproduction speed N times that of the normal reproduction is performed on the receiving side of the AV signal, the normal audio is transmitted. The audio signal is subjected to time-saving reproduction that is output in a state close to the pitch at the time of reproduction, and at the transmitting side of the AV signal, the time-saving reproduction optimum for the program included in the broadcast signal and each scene of the program is performed. A broadcasting system, wherein a parameter is created, and the created parameter is superimposed on the broadcast signal as time saving reproduction setting information and transmitted. 2. The time saving reproduction setting information includes the optimum parameter for each scene created at each time representing the switching of the scene.
Broadcast system described in. 3. The audio signal is an audio signal of a plurality of channels, and at the transmitting side of the AV signal, the time saving reproduction parameter is created for the audio signal of each channel to generate the time saving reproduction setting information. The broadcasting system according to claim 1, wherein: 4. The broadcast according to claim 3, wherein the time saving reproduction setting information includes the optimum parameter for each scene created for the audio of each channel at each predetermined time. system. 5. The time-shortening reproduction parameter includes a parameter for detecting a silent portion, and a compression ratio in the time direction of the audio signal during the high-speed reproduction is set according to the length of the silent portion. The broadcast system according to any one of claims 1 to 4, wherein the speech speed is determined by the above. 6. A signal separation unit for reading out an AV signal containing an audio signal recorded on a recording medium and separating it into various signals, and N for an audio signal obtained by separating the AV signal by the signal separation unit. An AV signal reproducing apparatus, comprising: a time shortening reproduction setting unit for performing time shortening reproduction for converting a sound at a double speed reproduction into a state close to a pitch at a normal reproduction, wherein the recording medium includes the content by the AV signal and each of the contents. A parameter for time saving reproduction that is optimum for a scene is recorded together with the AV signal as time saving reproduction setting information, and the time saving reproduction setting information obtained by being separated by the signal separation unit is given to the control unit, and the control is performed. The unit sets each parameter of the time saving reproduction according to the time saving reproduction setting information, and controls the time saving reproduction processing operation of the time saving reproduction setting unit. An AV signal reproducing device characterized by: 7. The time saving reproduction setting information includes the optimum parameter for each scene created for each time when the scene is switched, and when the control unit detects the time when the scene is switched, 7. The setting of each parameter of the time saving reproduction in the time saving reproduction setting unit is changed.
The AV signal reproducing device according to 1. 8. The audio signal is an audio signal of a plurality of channels, and the time saving reproduction setting information is composed of the parameters for the time saving reproduction for the audio signal of each channel, and the audio signal of each channel is given. The number of the time saving reproduction setting units is the same as the number of channels, and the controller controls the time saving reproduction setting units to which the audio signals of the respective channels are given based on the time saving reproduction setting information. 7. The AV signal reproducing apparatus according to claim 6, wherein the parameter of (1) is set. 9. The time saving reproduction setting information includes the optimum parameters for each scene created for the sound of each channel at each predetermined time, and the control unit sets the parameter at each predetermined time. 9. The AV signal reproducing apparatus according to claim 8, wherein the setting of each parameter of the time saving reproduction in the time saving reproduction setting unit for each channel is changed. 10. The time-shortening reproduction parameter includes a parameter for detecting a silent portion, and the time-shortening reproduction setting unit sets the time of the audio signal during the high-speed reproduction according to the length of the silent portion. 10. The AV signal reproducing device according to claim 6, wherein a compression rate in a direction is set to determine the speech speed.