JPH0746438A - Video/audio delay transmitter - Google Patents

Abstract

PURPOSE:To reproduce data without intermission by storing synchronized data to a delay memory, storing multiplexed video and audio data to a delay memory by a delay time when the delay time is set and then reading the data. CONSTITUTION:Inputted data are stored in a delay memory 17. When the data are not delayed, the inputted data are outputted respectively to audio data separation circuits 20, 25 and a video data separate circuit 30. For example, when a commercial is broadcast during a relay broadcast baseball, a delay time is inputted to a delay system controller 19 via an external interface section and the delay is set. When the delay is set, a signal from a memory address controller 18 is sequentially stored in the memory 17 based on a reference clock outputted from a reference clock generator 13. Data in the memory 17 are read in the order of storage and outputted to the circuits 20, 25, 30. Thus, the data of raw broadcast are outputted with a delay and then outputted without intermission in this way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video / audio delaying / sending apparatus for sending audio signals and video signals with a delay from the actual broadcast time.

[0002]

2. Description of the Related Art Conventionally, when another broadcast such as a commercial is broadcast during a time when a live broadcast such as a baseball broadcast is being broadcast on television, the live broadcast is switched and the commercial broadcast is broadcast.

[0003]

However, in that case, it often happens that this is not preferable for the viewer who starts a scene which is a famous scene of the program at the time of broadcasting the commercial. When such a situation occurs, for example, a complaint telephone is received, and the listening ratio is lowered, which is unfavorable. This is a serious problem for the director in charge of broadcasting.

The present invention has been made in view of such conventional problems, and even if another is broadcast during live broadcast, it is possible to continuously reproduce the live broadcast scene broadcast during that period. An object of the present invention is to provide a delayed video / audio delayed transmission device.

[0005]

Therefore, according to the present invention, there is provided a video data conversion means for A / D converting an input video signal and converting it into video data, and a sampling frequency generated in synchronization with the video signal. A / D input audio signal
Voice data conversion means for converting and converting to voice data,
A time compression memory for storing the voice data converted by the voice data converting means, and the voice data is written in the time compression memory at the same cycle as the sampling frequency,
Timed compression control means for reading the written audio data from the time compression memory at a read cycle shorter than the sampling frequency to control the time compression of the audio data, and the compressed audio data are multiplexed within the synchronous data period of the video data. Multiplexing means, a delay amount control means for setting a delay time, a delay memory for sequentially storing the multiplexed video and audio data by a set delay amount, and a delay memory for delaying the data. Delay memory control means for sequentially storing the amount, and then reading in the stored order, separating means for separating the read delay memory data into video data and audio data, and audio data separated by the separating means. And a time expansion memory for storing audio data in the time expansion memory at the same cycle as the reading cycle from the time compression memory. A time-expansion controller that writes and writes the written audio data from the time-expansion memory at the same cycle as the sampling frequency of the audio data to expand the time, and the time-expanded audio data is converted into an audio signal at the sampling frequency. Audio signal processing means for D / A converting and amplifying and outputting the audio signal; and video signal processing means for D / A converting the separated video data into a video signal and amplifying and outputting the video signal. , Is provided.

Further, the delay memory control means is configured to store a predetermined unit of data input to the delay memory on the first page in page units, while the delay memory control unit stores the data in the delay memory each time data is input. The stored data may be shifted and the input data may be written in the delay memory.

[0007]

According to the above construction, since the audio data is compressed and multiplexed within the synchronous data period of the video data, it is possible to send the audio data and the video data which are perfectly synchronized. Further, if the synchronized data is stored in the delay memory and the delay time is set by the delay means, the video and audio data multiplexed in the delay memory is stored in the delay memory for the delay time, and then the delay memory is set. Since the data is read by the control means, even if another is broadcast during live broadcasting, if the time for broadcasting another is set as the delay time, the data is reproduced without interruption.

Further, by configuring the delay memory control means as described above, when a predetermined unit of data is input, the data stored in the delay memory is shifted to the first page and thereafter, and the input data is the first page. It is possible to store the data written in the page and for the delay time in the delay memory, and the data is delayed and read in the stored order.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1 showing the present embodiment, input terminals 1, 5, and 9 are input terminals for a first audio signal, a second audio signal, and a video signal, respectively. For stereo broadcasting or bilingual broadcasting, for example, 2 The two audio signals are individually input to the input terminals 1 and 5 as the first and second audio signals.

An audio amplifier 2, an A / D converter 3, and a time compression memory 4 are sequentially connected to the input terminal 1 up to the switching device 16, and an audio amplifier 6, an audio amplifier 6, up to the switching device 16 are sequentially connected to the input terminal 5. An A / D converter 7 and a time compression memory 8 are connected, and an input terminal 9 is sequentially connected to a switching device 16 with a video amplifier 10 and A / D
The D converter 11 is connected. The output data of the time compression memories 4 and 8 and the A / D converter 11 are multiplexed by switching the switch 16. The A / D converters 3 and 7 correspond to audio data converting means, and the A / D converter 11 corresponds to video data converting means.

A delay memory 17 is connected to the switch 16. The delay memory 17 is a memory for delaying the reproduction of the live broadcast while another broadcast is being broadcast during the live broadcast, for example, when another broadcast is broadcast. A multi-frame image memory that stores the data in units of one page is used. The amount of data stored for each page may be one field data instead of one frame data.

In the delay memory 17, the first and second voices,
Blocks for outputting a video signal are sequentially connected. That is, as a block for outputting the first audio signal, the audio data separation circuit 20, the time expansion memory 21, the D / A converter 22, and the audio amplifier 23 are sequentially connected from the delay memory 17 to the audio amplifier 23. The first audio signal is output from the connected output terminal 24.

As a block for outputting the second audio signal, the audio data separation circuit 2 from the delay memory 17 is also provided.
0, time expansion memory 26, D / A converter 27, audio amplifier 28
Are sequentially connected, and the second audio signal is output from the output terminal 29 connected to the audio amplifier 28. As a block for outputting a video signal, the delay memory 17, the video data separation circuit 30, the 1H delay circuit 31, the D / A converter 3 are provided.
2. The video amplifier 33 is sequentially connected, and the video signal is output from the output terminal 34 connected to the video amplifier 33. 1H here
The delay circuit 31 is a circuit for synchronizing the timing with the audio signal because the video data is delayed by one horizontal section when the compressed audio data is multiplexed in the switcher 16.

The audio data separating circuits 20, 25 and the video data separating circuit 30 serve as separating means, and the D / A converters 22, 27,
The audio amplifiers 23 and 28 correspond to audio signal processing means, and the 1H delay circuit 31, the D / A converter 32, and the video amplifier 33 correspond to video signal processing means. On the other hand, a sync separation circuit 12 and a reference clock generator 13 are sequentially connected to the input terminal 9 in addition to the blocks described above. The reference clock generator 13 includes an audio compression / expansion controller 14 and an audio data switching controller. 15 are connected to each.

The audio compression / expansion controller 14 is a block which generates a control signal to control the time compression memories 4 and 8 and the time expansion memories 21 and 26, and corresponds to time compression control means and time expansion control means. The audio data switching controller 15 is a block that controls the switching device 16, the audio data separating circuits 20 and 25, and the video data separating circuit 30. The voice data switching controller 15 and the switching device 16 correspond to the multiplexing means.

Next, the input terminal 35 is a terminal to which an external interface is connected and the set delay time is input. The delay time input from the input terminal 35 is input to the delay amount system controller 19. It The external interface and the delay amount system controller 19 correspond to the delay means. Further, the memory address controller 18 is connected to the delay amount system controller 19, inputs the reference clock generated by the reference clock generator 13, and controls the memory address for the delay memory 17 based on the delay time. In this embodiment, the write system and the read system have the same synchronization signal, and the address controller 18 uses the same address counter. Therefore, if there is no video signal input, the output of this device is
It will not change. A data shift method is used to delay the data using the delay memory 17, which will be described later. The memory address controller 18 corresponds to the delay memory control means.

Next, the operation will be described. The video signal is
Input to the input terminal 9. The horizontal synchronizing frequency of the video signal is nominally 15.75 kHz, and the horizontal synchronizing period is about 4.7 μ.
s. The input video signal is amplified by the video amplifier 10 and A / D converted by the A / D converter 11, and the video signal is converted into 8-bit video data having a horizontal synchronization period.

Also, for example, in the case of stereo broadcasting or bilingual broadcasting, the first and second audio signals as two audio signals are individually input to the input terminals 1 and 5 in synchronization with the video. The input first and second audio signals are respectively amplified by the audio amplifiers 2 and 6 and then input to the A / D converters 3 and 7. Next, operations from sampling of audio signals to multiplexing will be described with reference to FIGS. In the figure, the numbers in parentheses after the data numbers of the signals (d) to (g) indicate the number of quantization bits of the data, and U and D after the data numbers of the signals (f) and (g). Indicates that they are upper 8 bits and lower 8 bits of 16-bit data, respectively.

First, the sampling of an audio signal will be described. According to Nyquist's sampling theorem, digital conversion is performed at a sampling frequency of at least twice the required band,
It is well known that the signal can be restored by reproducing at the same frequency as the sampling frequency. Further, since the horizontal synchronizing frequency of the video signal is nominally 15.75 kHz, it can be restored by digitally converting an audio signal having a signal band of 20 kHz at a frequency of 47.25 kHz which is three times as high as the horizontal synchronizing frequency. Then, the digital conversion is performed at a frequency of 4 times 63 kHz.

The first and second audio signals are shown in FIGS.
As shown in, the frequency is changed by the A / D converters 3 and 7, respectively.
It is sampled in synchronization with the rising edge of the 63 kHz (= 15.87 ms) sampling clock, and is digitally converted into 16-bit data as shown in (d) and (e).
It should be noted that the video signal normally requires a gradation of 8 bits, whereas the audio data requires a gradation of 16-bit precision in order to improve the resolution, and the data length of the audio signal is the same as that of the video signal. It is twice the data length. As a result, the first and second audio signals which are continuous signals are converted into the first and second audio data which are intermittent signals.

Since the first and second audio data are A / D converted at four times the horizontal frequency of the video signal, the number of data in each horizontal section of the television signal is four (in the figure, For the first voice data (d), for example, 1-
1 (16) to 1-4 (16), and for the second audio data (e), 1-1 (16) to 2-4 (16)). Therefore, (f),
As shown in (g), when 16-bit data of audio data is divided into upper 8 bits and lower 8 bits and treated as 8 bit data, the number of data in one horizontal section of the television is 8 data per channel. Become.

Next, the first and second audio data are input to the time compression memories 4 and 8, respectively, and time-axis compression for multiplexing the audio signal with the television signal is performed. In order to perform time compression, reading is performed at a cycle that is significantly different from the audio data write cycle. That is, the data in which the number of data per channel is 8 is stored in the time compression memories 4 and 8 in the horizontal synchronization section of the television signal in synchronization with the sampling clock for A / D converting the audio data, Eight pieces of data are read out in the horizontal sync section if read at the clock (4 times subcarrier frequency: 14.318 MHz) for A / D conversion of the television signal in the horizontal sync section (about 4.7 μs) of the video signal. , The time axis is compressed. That is, the number of data in the horizontal synchronization section is 4.7
μs ÷ (1 / 14.318MHz) = 67 data, and audio signals can be multiplexed up to 8 channels.

Next, the compressed audio data and the digitally converted video data are multiplexed by switching the switch 16 based on the control signal of the audio data switching controller 15. 3 and 4 are diagrams showing the multiplexing,
FIG. 4 is an enlarged view of FIG. In FIG. 3, the audio data for one horizontal synchronizing section is multiplexed in T ₂ which is the synchronizing signal section after the video signal as shown by the arrow in FIG. 3 or as shown in FIG. Then, the multiplexed data is output from the switch 16 to the delay memory 17
Entered in.

The input data is stored in the first page of the delay memory 17. When this data is not delayed, the input data is output as it is to the audio data separation circuits 20 and 25 and the video data separation circuit 30, respectively. In addition, when delaying the data, for example, when a live broadcast such as a baseball relay is being broadcast on television, for example, when broadcasting a commercial broadcast for 90 seconds, the live broadcast can be switched to the commercial broadcast. It is input from the external interface 35 to the delay amount system controller 19 via the input terminal 35. Then, the delay amount system controller 19 sets the delay amount. When this delay amount is set, the memory address controller 18 changes the reference clock generator.
Based on the reference clock output from 13, the data is sequentially stored in the delay memory 17, and the data stored in the delay memory 17 is shifted by the above-mentioned data shift method.

The data shift method is a method of sequentially shifting to the subsequent pages by the number of pages according to the delay amount. That is, according to this method, as shown in FIG. 5A, the data for one frame stored in the first page of the delay memory 17 is shifted to the second page and (B ), The data for the next one frame is input to the first page. After that, in the delay memory 17,
Data is sequentially input and shifted, and 90 seconds of data is stored.

The data in the delay memory 17 are read out in the order in which they are stored, that is, sequentially from the data of the first frame, and are output to the separation circuits 20, 25 and 30. From the data read from the delay memory 17, audio data separation 20 and 25
By this, the synchronous portion of the multiplexed video signal is extracted, and the audio signal multiplexed with the synchronous signal is separated,
The data is stored in the time extension memories 21 and 26, and is decompressed in the reverse way of the time of compression. That is, in order to expand the data, under the control of the audio compression / expansion controller 14, the television signal is stored in the time expansion memories 21 and 26 at a clock (14.318 MHz) for A / D conversion, and A / D converted. When reading from the time extension memories 21 and 26 in synchronization with the sampling clock, the time axis extension is performed.

The video data is extracted from the multiplexed data in the video data separation 30. Then, the video data is input to the 1H delay circuit 31, delayed by one horizontal section, and adjusted in timing with the audio signal.
Depending on the storage method, it may not be necessary to delay one horizontal section. That is, if the video data is delayed and multiplexed more than the audio data at the time of storage, the delay of one horizontal section is unnecessary.

The decompressed first and second audio data are respectively D
After being converted into analog signals by the A / A converters 22 and 27 and amplified in the voice amplifiers 23 and 28, output terminals 24 and 29
Are output as first and second audio signals. The video data is also converted into an analog signal by the D / A converter 32, passes through the video amplifier 33, and is output from the output terminal 34 as a video signal.

As a result, for example, when a 90-second commercial broadcast is broadcast during a live broadcast of a baseball broadcast, the live broadcast is switched and the commercial broadcast is broadcast for 90 seconds. After the commercial broadcast ends, the live broadcast data is output with a delay, and the live broadcast data is output without interruption.

According to this structure, by multiplexing the audio data within the synchronizing signal period of the video data, it is possible to send the audio data and the video data which are perfectly synchronized. Therefore, it is most suitable for TV broadcasting in which the video signal and the audio signal must be matched. Since voice signals can be used in up to 8 channels, the voice of the commentator can be multiplexed in a channel different from that of the live announcer in the live broadcast.

Further, the multiplexed data is stored in the delay memory 17 and is controlled from the outside so as to be delayed by, for example, the commercial broadcast time, so that even if other data is broadcast during the broadcast, the scene during the broadcast It is possible to continue playing. As compared with a storage device that easily deteriorates, such as a VTR, since the IC memory is used, the image quality can be assured so that it can be used for material transmission of a broadcasting station.

Further, since the video signal and the audio signal are multiplexed and stored in the same memory, the storage capacity of the memory is small, and the control is simple and can be put to practical use with a simple device. In this embodiment, a circuit for processing an audio signal is provided for two channels for the first and second audio signals so as to mainly support stereo broadcasting (two channels), but the present invention is not limited to this. Audio signal is 1 like monaural broadcasting
The case of channels can be easily implemented if nothing is connected to one audio input terminal and one output terminal. Also, by connecting blocks similar to the first and second audio input blocks in parallel, the audio signal processing circuit can have three or more channels.

Further, in the embodiment, the memory is used to perform the time axis compression / expansion of the audio signal, but the data amount is 8
Since the number is extremely small, it can be easily realized by using a register or the like without using a memory.

[0034]

As described above, according to the present invention, the audio data and the video data which are perfectly synchronized can be transmitted by multiplexing the audio data within the synchronous data period of the video data. It is suitable for a device that needs to output an audio signal and a video signal at the same time, such as television broadcasting, and since it is compressed and multiplexed, a lot of audio data can be multiplexed within the synchronization data period. Can be transformed.

Further, by setting the delay time and storing the data for the delay time in the delay memory and then reading the data, it is possible to reproduce the data without interruption even if another one is broadcast during live broadcasting. Furthermore, like VTR,
Compared with a storage device that easily deteriorates, since the IC memory is used, the image quality can be assured so that it can be used as the material transmission of the broadcasting station.

Further, by configuring the delay memory so that a predetermined unit of data is stored in units of one page, the data stored in the delay memory is shifted to one page and thereafter, and the data is written in every predetermined unit. , Video signal,
The audio signal can be delayed.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing a method for time compression of the audio signal of FIG.

FIG. 3 is an explanatory diagram showing a method of multiplexing the audio signal of FIG. 1 with a video signal.

FIG. 4 is a partially enlarged view of FIG.

5 is an explanatory diagram of a data shift method in the delay memory of FIG.

[Explanation of symbols]

 4, 8 hours compression memory 16 switch 17 delay memory 21, 26 hours expansion memory 31 1H delay circuit

Claims (2)

[Claims] 1. A video data conversion means for A / D converting an input video signal and converting it into video data, and an A / D conversion for an audio signal input at a sampling frequency generated in synchronization with the video signal. Audio data conversion means for converting to audio data, a time compression memory for storing the audio data converted by the audio data conversion means, and the audio data is written in the time compression memory at the same cycle as the sampling frequency, A time compression control means for reading the written audio data from the time compression memory at a read cycle shorter than the sampling frequency to control the time compression of the audio data, and the compressed audio data is multiplexed within the synchronous data period of the video data. Multiplexing means, a delay amount control means for setting a delay time, the multiplexed video and audio data, A delay memory for sequentially storing a predetermined delay amount; a delay memory control unit for sequentially storing the data for the delay amount in the delay memory and then reading in the stored order; Separation means for separating video data and audio data, a time expansion memory for storing the audio data separated by the separation means, and audio for the time expansion memory at the same cycle as the read cycle from the time compression memory. Time expansion control means for writing data, reading the written audio data from the time expansion memory at the same cycle as the sampling frequency of the audio data and expanding the time, and the time expanded audio data at the sampling frequency Audio signal processing means for D / A converting into a signal, amplifying and outputting the audio signal, and the separated video data And D / A converted into a video signal, video and audio delay delivery apparatus characterized by comprising: a video signal processing means for amplifying and outputting a video signal, a. 2. The delay memory control means is configured to store a predetermined unit of data input to the delay memory on a first page page by page basis, while the delay memory control section stores the data in the delay memory each time data is input. 2. The video / audio delay transmitting apparatus according to claim 1, wherein the stored data is shifted and the input data is written in a delay memory.