JPH07123115A - Transmission equipment - Google Patents

Abstract

PURPOSE:To provide the transmission equipment which multiplexes and transmits a synchronous mode signal and an asynchronous mode signal. CONSTITUTION:This equipment consists of a synchronous packet transmission as the synchronous mode signal and a signal of higher necessity of real-time transmission as the asynchronous mode signal and divides the synchronous mode signal into plural synchronous packets, a synchronous packet transmitter 5 which transmits synchronous packets approximately periodically, an asynchronous packet generator 4 which makes an asynchronous packet of the asynchronous mode signal, and an asynchronous packet transnmitter 6 which inserts the asynchronous packet between synchronous packets to transmit it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission device for transmitting a video signal or an audio signal.

[0002]

2. Description of the Related Art Conventionally, data requiring real-time property such as video data, audio data, or auxiliary data of video data and audio data is transmitted as a synchronization mode signal having a certain time length such as a frame unit. Further, the control signal for controlling the video data, the audio data, or the auxiliary data thereof is transmitted as an asynchronous mode signal regardless of the real-time property.

[0003]

Here, when transmitting the synchronous mode signal and the asynchronous mode signal, separate series transmission lines are required.

In view of the above points, the present invention has an object to provide a transmission device for multiplexing and transmitting a synchronous mode signal and an asynchronous mode signal.

[0005]

In order to solve the above-mentioned problems, the transmission apparatus of the present invention is a signal which is highly required to be transmitted in real time when transmitting a video signal, an audio signal, an auxiliary signal or a control signal. Is a synchronous mode signal, a signal that is not required to be transmitted in real time is an asynchronous mode signal, and a synchronous packet generating unit that divides the synchronous mode signal into a plurality of synchronous packets, and a synchronous packet that transmits the synchronous packets at almost constant intervals. Packet transmission means, asynchronous packet generation means that uses the asynchronous mode signal as an asynchronous packet, and asynchronous packet transmission means that inserts the asynchronous packet between synchronous packets and transmits the asynchronous packet.

[0006]

According to the present invention, with the above structure, the synchronous mode signal and the asynchronous mode signal are multiplexed and transmitted, so that data transmission can be performed without requiring a plurality of transmission lines.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the configuration of the first embodiment of the present invention.

In FIG. 1, 1 is a synchronous mode signal input terminal, 2 is an asynchronous mode signal input terminal, 3 is a synchronous packet generator, 4 is an asynchronous packet generator, 5 is a synchronous packet transmitter, and 6 is an asynchronous packet transmitter. , 7 are signal output terminals.

In FIG. 1, a sync mode signal requiring real-time property such as video data, audio data, or auxiliary data of video data and audio data is input from a sync mode signal input terminal 1, and the video data, audio data, Alternatively, a control signal for controlling the auxiliary data is input from the asynchronous mode signal input terminal 2 as an asynchronous mode signal. The control signal includes video data, a cue signal indicating the data head position of audio data, a playback time code for counting the playback time,
An index signal that displays the index of the transmitted data, a skip signal that skips the video data for an arbitrary number of frames, a speed signal that indicates the data playback speed, and whether the video data is in the still image mode or the moving image mode. There are still image mode signals to inform.

The sync mode signal is divided into a plurality of sync packets by the sync packet generator 3. FIG. 2 shows an example of sync packet division when one frame of video data is input as a sync mode signal. Synchronous packet generator 3
The synchronous packet output from the asynchronous packet transmitter after the speed is matched with the transmission speed by the synchronous packet transmitter 5.
Transmitted to 6. Further, the asynchronous mode signal is converted into an asynchronous packet by the asynchronous packet generator 4 and input to the asynchronous packet transmitter 6.

The asynchronous packet transmitter 6 performs a multiplexing transmission operation of transmitting asynchronous packets during the blanking period of transmitting synchronous packets. Then, the multiplexed synchronous packet and asynchronous packet are transmitted and output from the signal output terminal 7.

When video data or audio data cannot be reproduced as in high-speed reproduction, an asynchronous packet composed of an asynchronous mode signal such as a reproduction time code, video data, or a cue signal indicating the beginning position of audio data. Only the signal is output from the signal output terminal 7.

As described above, separate synchronous mode signals and asynchronous mode signals do not require separate transmission buses, and the synchronous mode signals and asynchronous mode signals are multiplexed and transmitted, so that the signals can be transmitted by a single transmission bus.

FIG. 3 shows how asynchronous packets are multiplexed with synchronous packets. As shown in FIG. 3, the asynchronous packet is transmitted during the blanking period when transmitting the synchronous packet.

As described above with reference to the embodiments, the transmission apparatus of the present invention does not require separate transmission buses for the synchronous mode signal and the asynchronous mode signal when transmitting and receiving data, and is asynchronous with the synchronous mode signal. By multiplexing and transmitting the mode signals, they can be transmitted by a single transmission bus.

In the above embodiment, the description has been made with reference to the configuration diagram of FIG. 1 for performing the multiplexed transmission of the synchronous mode signal and the asynchronous mode signal, but the configuration of the device is arbitrary.

Further, in the above embodiments, as an example of the control signal, a cue signal, a reproduction time code, an index signal,
Although the skip signal, the speed signal, the still image mode signal and the like are mentioned, the type of the control signal may be arbitrary.

Further, FIG. 2 shows the division from the synchronization mode signal into the synchronization packet, but the division method is arbitrary.

[0019]

As described above, according to the present invention,
Synchronous mode signals and asynchronous mode signals do not require separate transmission buses for data transmission and reception, and by multiplexing and transmitting synchronous mode signals and asynchronous mode signals,
It is possible to obtain a transmission device that can perform transmission with a single transmission bus.

[Brief description of drawings]

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

FIG. 2 is a diagram for explaining synchronization packet division according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of synchronization packet signals and multiplexing of the synchronization packet signals in the asynchronous packet transmitter used in the embodiment of the present invention.

[Explanation of symbols]

 3 Synchronous Packet Generator 4 Asynchronous Packet Generator 5 Synchronous Packet Transmitter 6 Asynchronous Packet Transmitter

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Claims (5)

[Claims] 1. When transmitting a video signal, an audio signal, an auxiliary signal or a control signal, a signal with a high need for real-time transmission is a synchronous mode signal, and a signal with a low need for real-time transmission is an asynchronous mode signal, A synchronous packet generating means for dividing the synchronous mode signal into a plurality of synchronous packets; a synchronous packet transmitting means for transmitting the synchronous packet at almost constant intervals; and an asynchronous packet generating means for making the asynchronous mode signal an asynchronous packet, A transmission device comprising: an asynchronous packet transmission means for inserting the asynchronous packet between the synchronous packets and transmitting the asynchronous packet. 2. The transmission device according to claim 1, wherein the video signal or the audio signal, the auxiliary signal of the video signal or the auxiliary signal of the audio signal is used as a synchronization mode signal. 3. A cue signal indicating a head position of an audio signal or a video signal, an index signal indicating an index of the audio signal or the video signal to be transmitted, or an arbitrary frame of the audio signal or the video signal. A skip signal for not performing a certain number of reproductions, a speed signal indicating a data reproduction speed of the audio signal or the video signal, or a still image mode signal indicating that the video signal is in a still image mode, as an asynchronous mode signal. The transmission device according to claim 1, wherein 4. The transmission device according to claim 1, wherein the size of the synchronization packet is smaller than the size of data transmitted during one screen of the video signal. 5. The transmission device according to claim 1, wherein the asynchronous packet transmission means transmits only the asynchronous packet at the time of high speed reproduction without transmitting the audio signal or the video signal.