JPH0522691A - Image transmitter - Google Patents

Abstract

PURPOSE:To effectively record and preserve the coded data without connecting an external device and to transmit them by reproduction. CONSTITUTION:The information of the coding starting in a frame at video data is received from a transmitting recording re-control part 20, video coding data and audio coding data are recorded in a transmitting data recording and reproducing part 21, and when the reproduction information is received, by switching a video data switch 22 and an audio data switch 23, the video coding data and the audio coding data from the transmitting data recording and reproducing part 21 can be reproduced and outputted to a transmission framing part 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image transmission apparatus for transmitting video and, if necessary, audio between two or more points separated from each other.

[0002]

2. Description of the Related Art FIG. 3 shows, for example, Mitsubishi Electric Technical Report Vol. 6
0, No. 10 is a block diagram showing the conventional image transmission device shown in FIG. 10, 1986, in which 1 is a video signal input section, 2 is an external video input terminal of the video signal input section 1, 3
Is an input frame memory unit, 4 is an encoding frame memory unit, 5 is a subtractor that subtracts the outputs of these memory units 3 and 4, 6 is a video encoding unit that video encodes the subtraction output data, and 7 is a video A transmission buffer unit, 8 is a video decoding unit that decodes encoded video data, 9 is an adder, 10 is a voice input unit, 11 is an external voice input terminal provided in the voice input unit 10, and 12 is a voice input code An audio encoding unit for converting, 13 an audio transmission buffer unit, 14 a transmission framing unit for performing multiple framing of audio data and video data, 15
Is a transmission interface unit, and 16 is a line output terminal.

Next, the operation will be described. The video signal input to the video signal input unit 1 from the video input device or the external video input terminal 2 is processed by the video signal input unit 1 such as YC separation and digitization, and then input frame memory unit. Accumulated in 3. Also, the video data output from the input frame memory unit 3 at a speed and data format suitable for encoding is encoded by the encoding frame memory unit 4
The difference is calculated by the subtracter 5 from the encoded previous video data (described later) output by the subtracter 5 and becomes interframe difference data, which is input to the video encoding unit 6.

In the video encoding unit 6, the inter-frame difference data is highly efficiently encoded according to a predetermined algorithm, and the video encoded data obtained by compressing the data amount is input to the video transmission buffer unit 7 and the It is input to the video decoding unit 8 for encoding. Then, the video decoding unit 8 performs the decoding process by the algorithm reverse to the coding, and the data output as the inter-frame difference data is output from the coded frame memory unit 4. The encoded previous video data is added by the adder 9,
The encoded current video data is stored in the encoded frame memory unit 4 for the next calculation. On the other hand, the voice input unit 1
The voice signal input from the voice input device 0 or the external voice input terminal 11 is subjected to processing such as amplitude limitation in the voice signal input unit 10 and then encoded in the voice encoding unit 12 to obtain a voice transmission buffer. It is stored in the unit 13.

On the other hand, in the transmission framing unit 14, the video data stored in the video transmission buffer unit 7 is transmitted at a predetermined transmission speed, and the audio encoded data stored in the audio transmission buffer unit 13 is converted into video data. After the time adjustment of, each is input at a predetermined transmission rate. Therefore, the transmission framing unit 14 performs the multiple framing according to the transmission format, and then the transmission interface unit 15
More suitable for transmission line, line output terminal 1
It is output from 6 to the transmission line.

As is clear from the above, the video data transmitted to the transmission line is mainly the inter-frame difference data, and for decoding on the receiving side, the coded frame memory unit 4 on the transmitting side is used. If the contents do not match the same function unit on the receiving side, correct transmission will not be performed. Therefore, the video / audio transmission device sets the output data from the encoded frame memory unit 4 on the transmission side, which is called an intra-frame encoding mode, to a certain fixed data irrelevant to the immediately preceding data, and the inter-frame difference data is used by this data. And a function of transmitting the operation in this mode to the receiving side in the transmission data, so that the discrepancy between the contents of the encoded frame memory unit 4 for transmission and reception due to a transmission line error or the like is converged. There is.

[0007]

Since the conventional image transmission apparatus is configured as described above, when transmitting a video and audio that have been stored once, the encoded data is mainly difference data. Since it is not suitable for storage, the data before encoding stored in a device such as a VTR must be input from the external video input terminal 2 and the external audio input terminal 11 using the same device. However, there is a problem in that the amount of stored data becomes enormous and it is difficult to link with the incoming / outgoing state of the line.

The invention of claim 1 has been made to solve the above problems, and it is possible to create, store and transmit stored data to be transmitted without connecting to an external recording device such as a VTR. An object is to obtain an image transmission device.

According to the second aspect of the present invention, an image transmission apparatus is provided which can automatically perform a notification by a transmission recording / re-control unit for instructing the start of recording or reproduction of transmission data according to the state of the transmission system. The purpose is to

[0010]

According to another aspect of the present invention, there is provided an image transmission apparatus, which notifies recording or reproduction, and causes a video encoding unit to start intraframe encoding a plurality of times by the notification of recording. , A transmission record re-control unit that returns to the inter-frame encoding and clears the data accumulated in the video transmission buffer unit, and records and saves the video encoded data and audio encoded data that are input after the above notification. A transmission data recording / reproducing unit for receiving the reproduction notification, and transmitting the video data and the audio data from the transmission data recording / reproducing unit to the transmission framing unit by the video data switching unit and the audio data switching unit. Each of them is adapted to be switched and input.

The image transmission apparatus according to the second aspect of the present invention notifies recording or reproduction, causes the video encoding unit to start frame encoding a plurality of times by the notification of recording, and then returns to interframe encoding. And a transmission record re-control unit that clears the data accumulated in the video transmission buffer unit,
After the notification, a transmission data recording / reproducing unit for recording and storing the input video encoded data and audio encoded data is provided, and the video data from the transmission data recording / reproducing unit is received in response to the notification of the reproduction. And audio data are switched and input to the transmission framing unit by the video data switching unit and the audio data switching unit, respectively, and the state of the transmission system is recognized by the transmission state recognition unit, and the transmission record is recorded according to the recognition result. The re-control unit is controlled.

[0012]

In the transmission data recording / reproducing unit according to the first aspect of the present invention, the highly efficient encoded data starts to be preserved at the same time as the intraframe encoding according to the instruction of the transmission recording / reproducing control unit. Becomes the intra-frame coded data, and the coded data can be effectively saved, and as a result, V
It is not necessary to store and reproduce pre-encoded data by connecting an external device such as a TR, and moreover, the amount of stored data can be reduced by handling encoded data. In addition, since the stored data is encoded data, it can be stored as encrypted data using a special algorithm for encoding.

The transmission state recognizing unit in the invention of claim 2 causes the transmission record re-control unit to automatically output predetermined notification data in accordance with the transmission state.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention of claim 1 will be described below with reference to the drawings. In FIG. 1, 1 is a video signal input unit,
Reference numeral 2 is an external video input terminal of the video signal input unit 1, 3 is an input frame memory unit, 4 is an encoding frame memory unit, 5 is a subtractor for subtracting the outputs of the respective memo units 3 and 4, and 6 is a subtraction output. A video encoding unit for video encoding data, 7 a video transmission buffer unit, 8 a video decoding unit for decoding encoded video data, 9 an adder, 10 an audio input unit, 11 an audio input unit 10. An external audio input terminal provided, 12 an audio encoding unit for encoding an audio input, 13 an audio transmission buffer unit, 14 a transmission framing unit for multiple framing of audio data and video data, 15 a transmission interface unit, Reference numeral 16 is a line output terminal, 20 is a transmission record re-control unit for notifying the start or end of recording or reproduction of transmission data,
21 is a transmission data recording / reproducing unit that records and reproduces video data and audio data in response to the notification.
Is a video data switching device and a voice data switching device for switching the video data and audio data from the transmission data recording / reproducing unit in the reproduction mode and inputting them to the transmission framing unit 14.

Next, the operation will be described. Since the normal operation is the same as the conventional example, the operation at the time of recording / reproducing a different additional portion will be described below. First, when the recording start is selected by the transmission recording / re-control unit 20, the recording start is notified to the video encoding unit 6, the video transmission buffer unit 7, and the transmission data recording / reproducing unit 21. Therefore, the video encoding unit 6 receives the notification, starts a new intra-frame encoding, notifies the transmission data recording / reproducing unit 21 of the start, and performs the intra-frame encoding once or a plurality of times. ,
Return to interframe coding. Also, the video transmission buffer unit 7
Clears the data accumulated before the above notification. Further, the transmission data recording / reproducing unit 21 records and saves the input video coded data and audio coded data after the above two notifications are made.

On the other hand, when reproduction start is selected in the transmission recording / reproducing control unit 20, the video data switching unit 22 and the audio data switching unit 23 are switched to the output side of the transmission data recording / reproducing unit 21, and the transmission data recording / reproducing unit 21. The stored data is sequentially output from the first recorded intra-frame encoded data, so that transmission framing and interface processing are performed and the data is transmitted.

FIG. 2 shows an embodiment of the invention of claim 2. In this embodiment, the invention according to claim 1 controls the transmission data recording / reproducing unit 21 by notifying the start of the intra-frame encoding of the video encoding unit 6 and the transmission record re-control unit 2 by a human operation.
The transmission state recognition unit 30 is connected to the transmission record re-control unit 20, and the transmission record re-control unit 20 is automatically controlled by the transmission state recognition unit 30. It was done like this. That is, the transmission recording / re-control unit 20 is controlled according to the state of the transmission system, for example, the operation mode is determined by the incoming call, the line synchronization or the in-channel data, and the control output is used as the notification data of the transmission data recording / reproducing unit 21. Allow control.

[0018]

As described above, according to the first aspect of the present invention, the recording or reproduction is notified, and the video coding unit is caused to start the intra-frame coding a plurality of times by the notification of the recording, and A transmission / recording re-control unit that clears the data accumulated in the video transmission buffer unit while returning to encoding.
After the notification, a transmission data recording / reproducing unit for recording and storing the input video encoded data and audio encoded data is provided, and the video data from the transmission data recording / reproducing unit is received in response to the notification of the reproduction. Since the audio data and the audio data are switched and input to the transmission framing section by the video data switching device and the audio data switching device, respectively, the same system as that for normal transmission can be achieved without using other external devices such as a VTR. With the configuration, encoded digital data with a small amount of recorded data can be effectively recorded, and in addition to being able to reproduce and transmit it, it is encoded with a special algorithm in order to record and store the encoded data. For data, it is effective to obtain the data that can be kept confidential.

According to the second aspect of the present invention, recording or reproduction is notified, and after the recording is notified, the video coding unit is caused to start the intra-frame coding a plurality of times, and then the inter-frame coding is resumed. At the same time, a transmission recording / reproducing control unit that clears the data accumulated in the video transmission buffer unit, and a transmission data recording / reproducing unit that records and stores the input video coded data and audio coded data after the above notification. In response to the notification of the reproduction, the video data and the audio data from the transmission data recording / reproducing unit are switched and input to the transmission framing unit by the video data switching unit and the audio data switching unit, respectively, and further transmitted. Since the state recognition unit is provided to control the transmission recording / re-control unit according to the recognition result of the transmission system, the incoming call, the line synchronization or the in-channel data can be controlled. You can control the transmission data reproducing unit by the notification data according to the determination or the like of the operation mode by there is an effect to be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an image transmission device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an image transmission device according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a conventional image transmission device.

[Explanation of symbols]

3 Input frame memory section 4 Encoding frame memory unit 5 subtractor 6 Video coding unit 7 Video transmission buffer section 8 Video decoding section 9 adder 12 Speech coding unit 13 Voice transmission buffer section 14 Transmission framing section 20 Transmission record re-control unit 21 Transmission data recording / playback unit 22 Video data switch 23 Voice data switch 30 Transmission status recognition unit

Claims (2)

[Claims] 1. An input frame memory unit in which a video signal is stored, and a subtractor for calculating a difference between video data from the input frame memory unit and encoded previous video data to obtain interframe difference data. A video encoding unit for highly efficiently encoding the interframe difference data to output video encoded data, a video decoding unit for decoding the video encoded data to produce interframe difference data, and the video decoding Adder for adding the inter-frame difference data from the section to the encoded previous video data and outputting the encoded current video data, and the above-mentioned encoded data based on the addition output data of the adder. Of the preceding video data, and inputs it to the subtractor, a coded frame memory, a video transmission buffer section for storing the video coded data from the video coding section, and an audio signal. From an audio encoding unit, an audio transmission buffer unit that stores the encoded audio data, video encoded data from the video transmission buffer unit, and the audio transmission buffer unit that time-adjusts the video encoded data. In a video transmission apparatus having a transmission framing unit for performing multi-framing of audio coded data and outputting the same, recording or reproduction is notified, and the video encoding unit is notified of the recording multiple times by intra-frame encoding After that, the transmission record re-control unit that returns to the inter-frame coding and clears the data accumulated in the video transmission buffer unit, and the video coded data and audio code that are input after the notification The transmission data recording / reproducing unit for recording and storing the encoded data, and the video data from the transmission data recording / reproducing unit upon receiving the reproduction notification. Audio data and image transmission apparatus, characterized in that a video data selector and the audio data switching unit for input switching each to the transmission framing unit. 2. An input frame memory section for storing a video signal, and a subtracter for calculating a difference between the video data from the input frame memory section and the encoded previous video data to obtain interframe difference data. A video encoding unit for highly efficient encoding the interframe difference data to output video encoded data, a video decoding unit for decoding the video encoded data to produce interframe difference data, and the video decoding Adder for adding the inter-frame difference data from the section to the encoded previous video data and outputting the encoded current video data, and the above-mentioned encoded data based on the addition output data of the adder. Of the preceding video data, and inputs it to the subtractor, a coded frame memory, a video transmission buffer section for storing the video coded data from the video coding section, and an audio signal. From an audio encoding unit, an audio transmission buffer unit that stores the encoded audio data, video encoded data from the video transmission buffer unit, and the audio transmission buffer unit that time-adjusts the video encoded data. In a video transmission apparatus having a transmission framing unit for performing multi-framing of audio coded data and outputting the same, recording or reproduction is notified, and the video encoding unit is notified of the recording multiple times by intra-frame encoding After that, the transmission record re-control unit that returns to the inter-frame coding and clears the data accumulated in the video transmission buffer unit, and the video coded data and audio code that are input after the notification The transmission data recording / reproducing unit for recording and storing the encoded data, and the video data from the transmission data recording / reproducing unit upon receiving the reproduction notification. And the audio data switching device for switching and inputting the audio data and the audio data to the transmission framing unit respectively, and the transmission state recognition for controlling the transmission recording / re-control unit according to the recognition result. And an image transmission device.