JPH07202941A - Digital data transmitting method - Google Patents

Abstract

PURPOSE:To improve operability by simplifying device configuration by unnecessitating the communicating function of external equipment control. CONSTITUTION:The form of a data packet at the time of transmission is expressed as a model, concerning a header 101, data block identification ID 102, 104, 106 and 108, data blocks 103, 105, 107 and 109 and DSO code 110 expressing the output source of data, for example, '000' expresses the reproduced output of a VTR and '001' expresses a tuner output. Concerning a DBS 111 expressing the data constitution inside a packet, for example '00000' expresses that six data blocks of the block length of 80 bytes exist inside the packet. Concerning an IDF code 112 expressing the kind of the format of the data block identification ID, for example, '000' expresses that the IDF code 112 is the ID of the data block of a television signal in the existing system. The data are transmitted between equipments in such a format.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital data transmission method between devices for transmitting and receiving digital data.

[0002]

2. Description of the Related Art In a conventional digital data transmission method, among a plurality of digital data recording / reproducing devices, a device on the transmitting side starts reproduction and a device on the receiving side starts recording, and a device on the transmitting side reproduces. When the operation is stopped, the cooperative operation of stopping the recording by the receiving device is realized by asynchronously transmitting the operating state of the transmitting device by a communication function of a system different from the reproduction data.

Further, the data format for each transmission method is unique to the optimal transmission medium set and adapted to the physical layer protocol.

[0004]

In the above-described conventional digital data transmission method, the external device control at the time of performing the cooperative operation is realized by giving the device a communication function. However, it also has the first problem that it is difficult to control the device at a desired timing because the cost is high, the price of the device is high, and in terms of operability, the control command is asynchronously transmitted. It was

A second problem is that the transmission data format is the same regardless of the output state of the transmission side apparatus, and the control of the reception side apparatus cannot be switched due to the difference in the data format. Had.

Further, the data format of a transmission packet is usually a header and data added at the beginning of the data, and the structure of the header itself is defined by the content of the data. Since the format is peculiar to the transmission method and the data itself transmitted by the transmission method, it is necessary to change the configuration of the header when transmitting by another transmission method or when transmitting data of another data format. However, the third problem is that when the header configuration is changed, the device that transmits and receives data must support a plurality of header formats, which increases the cost of the device.

[0007]

In order to solve the above first and second problems, in the digital data transmission method of the first invention, the first header for identifying the signal output source of the digital data is identified in the header of the packet. Describe and transmit the identifier.

In order to solve the third problem, in the digital data transmission method according to the second aspect of the present invention, the block length of one data block in the packet is fixed, and the data in the packet is stored in the header of the packet. Second identifying configuration
And the I that identifies the data block in the packet
A third identifier for identifying the type of D format is described and transmitted.

[0009]

The digital data receiving apparatus detects the first identifier for identifying the signal source of the digital data described in the header of the input data packet, and controls the operation of the digital data receiving apparatus, so that Only by controlling the device, it is possible to control the device on the receiving side while synchronizing with each packet transmission cycle.

Further, the second identifier for identifying the data block structure in the packet and the third identifier for identifying the format type of the data block identification ID are described in the header of the packet, so that the transmission medium or the data itself is described. Can be dealt with by changing the data block length, the number of data blocks, and the format of the data block identification ID.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

First, an embodiment of the first invention will be described by taking a dubbing operation between two digital VTRs as an example.

FIG. 1 is a diagram schematically showing the format of a data packet at the time of transmission. 101 is a header, 102,
104, 106, 108 are data block identification IDs, 1
03, 105, 107, and 109 are data blocks, 11
0 is a DSO code representing an output source of data, for example, "000" represents a VTR reproduction output, "001" represents a tuner output, "010" represents a line input, and "011" represents a camera input. Reference numeral 111 is a DBS code representing the data structure in the packet. For example, "00000" indicates that there are 6 data blocks having a block length of 80 bytes in the packet, and "00001" indicates a block length of 80.
Indicates that there are 12 data blocks of bytes in the packet. Reference numeral 112 is an IDF code indicating the format type of the data block identification ID, for example, "0.
"00" represents the ID of the data block of the television signal of the current system, and if the value is any other value, it represents the ID of the data block corresponding to the other data format.

FIG. 2 is a diagram schematically showing the signal output states of the transmitting VTR at the time of reproduction and at the time of stop, and 120 and 130 are VTRs and 12 with a built-in tuner.
Reference numerals 1 and 131 are VTR sections, 122 and 132 are tuner sections, 123 and 133 are switches, and 124 and 134 are output signals. Further, FIG. 3 is a diagram schematically showing the flow of processing of the input signal of the VTR on the receiving side, in which 141 is an input terminal, 142 is an input signal, 143 is a data receiving section, 1
44 is header information separated from the input signal 142, 14
5 is a DSO code detector, 146 is a DSO code, 147 is a control circuit, 148 is a control signal, 149 is an input signal 142.
And 150 is a video signal recording unit.

The input signal 141 in FIG. 3 is a digital signal and is transmitted in the form of the packet shown in FIG.
Further, the output signal 124 in FIG. 2 is a reproduction signal of the VTR unit 121, and the output signal 134 is the tuner unit 132.
Is the received signal. The output signal 124 of the transmitting VTR at the time of dubbing is the input signal 141 in FIG.
The O code is transmitted as "000" indicating the reproduction output of the VTR. The data receiving unit 143 separates the input signal 141 into the header information 144 and the video signal 149 and outputs them. The output header information 144 is input to the DSO code detector 145, and the detected DSO code 146 is the control circuit 14
Input to 7. The control circuit 147 outputs the control signal 148 based on the input DSO code 146 to the data recording unit 1.
Send to 50. For example, when the DSO code is "000", a control signal for recording is sent, and when it is "001", a stop signal is sent.
That is, when the transmitting side is in the reproducing state, the receiving side is in the recording state, while when the transmitting side is in the tuner output state, the receiving side is in the stopped state. That is, the recording operation can be performed by the VTR on the receiving side only by reproducing and stopping the VTR on the transmitting side.

In the present embodiment, the digital VTR has been described as an example, but another digital data device such as a magnetic disk recording device may be used. Also,
The position of the DSO code in the header and the codeword length are arbitrary. Furthermore, operations other than dubbing can be dealt with by devising the setting of the operation of the device on the receiving side for the DSO code.

Next, an embodiment of the second invention will be described with reference to FIG. In data transmission, it becomes necessary to change the packet length, the data block length in a packet, or the number of data blocks according to the type of transmission medium or transmission device. Along with this, an ID for identifying the data block
The code structure also needs to be changed. DBF code 11 representing the data block structure in the packet in the packet header
By describing 2, by changing the description of the DBF code 112 with the change of the number of data blocks, it is possible to deal with the change of the packet size due to the change of the transmission medium.

For example, when the data in the packet is composed of 6 data blocks of 80 bytes, "00000" is described in the position of the DBF code of the header, and the DBF code is read by the receiving device to obtain one packet. Minute data can be read. Further, when the data in the packet is composed of 12 data blocks of 80 bytes, "00001" is described in the position of the DBF code of the header, so that the receiving device similarly performs one packet. You can read the data.

Further, each data block 103, 105,
Data block identification ID 10 for 107 and 109
A code for identifying the format type of 2, 104, 106, 108 is added to the IDF code 112 in the header of the transmission packet.
As. For example, in order to notify the receiving device that the data block in the packet is a data block of a particular digital VTR, the ID of the header
Describe "000" at the position of the F code. If the IDF code is different data, it can be applied to other data transmission devices.

The data block length can take any value depending on the transmission device or transmission medium.
The position of the code, the DBF code, and the IDF code in the header and the code word length are both arbitrary.

[0021]

As described above, in the digital data transmission method of the first aspect of the present invention, the communication function for sending the command for controlling the external device independently of the transmission data is unnecessary, so that the device configuration is simple. And an excellent effect that the operability is improved can be obtained.

In the digital data transmission method of the second invention, it is possible to diversify the data structure in the packet, and it is possible to cope with changes in the transmission medium, the data to be transmitted, and the transmitting / receiving device, which is an excellent effect. can get.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a transmission packet in a digital data transmission method of the present invention.

FIG. 2 is a block diagram of V using the digital data transmission method of the present invention.
Block diagram schematically showing the flow of data during TR transmission

FIG. 3 is a diagram schematically showing a data flow in a receiver of data transmitted by the digital data transmission method of the present invention.

[Explanation of symbols]

101 header 102, 104, 106, 108 data block identification ID 103, 105, 107, 109 data block 110 DSO code 111 DBF code 112 IDF code 120, 130 VTR 121, 131 VTR section 122, 132 tuner section 123, 133 switch 124 , 134 output signal 141 input terminal 142 input signal 143 data receiving section 144 header information 145 DSO code detector 146 DSO code 147 control circuit 148 control signal 149 video signal 150 data recording section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasutoshi Kawakami 1-8-8 Koshinmachi, Takamatsu City, Kagawa Prefecture Matsushita Judenko Kogyo Co., Ltd.

Claims (3)

[Claims] 1. A method of transmitting digital data in a packet, wherein an identifier for identifying a signal output source of the digital data is described in a packet header and transmitted. 2. A method for packetizing and transmitting digital data, wherein data in a packet is composed of one or more fixed-length data blocks, and an identifier for identifying a data block structure in the packet is provided in the packet. A digital data transmission method characterized in that the data is described in the header of the data and transmitted. 3. The data in the packet is made up of one or a plurality of data blocks each having a data block identification ID at the beginning, and an identifier for identifying the type of format of the data block identification ID is described in the header of the packet. The digital data transmission method according to claim 2, wherein