JPS63258130A - Data transmission method - Google Patents

Abstract

PURPOSE:To transmit a signal without high transmission speed even with a multichannel for one frame in response to a terminal number by constituting an 8-bit voice signal with 8 frames while assigning one bit to one frame. CONSTITUTION:A data group 1 of one frame consists of a control signal 2 and an information signal 3. The voice data consists of an 8-bit voice information signal 7 and includes a frame appeared with a voice synchronizing signal 6, and the data is accommodated one by one bit in the succeeding 8-frame. The voice data is received between a control section and a terminal equipment or between terminal equipments while being synchronized with the voice synchronizing signal 6. For example, one frame is transmitted in 96kHz and the voice synchronizing signal 6 is transmitted in an 8-kHz synchronizing pulse to send the 8-bit voice information signal 7, then 4 frames among 12 frames existing between a couple of voice synchronizing signals 6 have idle frames. Thus, the normal terminal data is allocated in the idle frame and the terminal data consists of the 8-bit information signal 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for transmitting data, and more particularly to a method for transmitting voice data in a local area network.

2. Description of the Related Art A conventional digital audio transmission method is generally shown in FIG. Here, the audio data is based on 8 KHz x 8 bits, with 8 bits as one channel, and one frame is composed of a plurality of channels according to the number of terminals. This one frame is synchronized at 125 μsec 8 (KHz), and data is transferred by time division multiplexing.

Problems to be Solved by the Invention However, in such conventional systems, the time per frame is fixed, so in order to increase the number of terminals that can be used, the transmission speed must be increased considerably. There is a point. Another problem is that a connection port (node) specifically for audio is required.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and to propose a data transmission method that does not increase the transmission speed and does not require special audio hardware in the nodes.

Means for Solving the Problems In order to solve the above problems, the present invention provides an area for a control signal for an audio synchronization signal and an area for a control signal for an audio synchronization signal in a signal group of one frame consisting of a control signal and an information signal. An area for audio information signals corresponding to bits is provided, and 8-bit audio data is configured by the signals in the audio information signal area in the subsequent 8 frames including the frame in which the signal appears in the audio synchronization signal area. It is something.

Effect In this way, one bit is allocated to one frame,
Since an 8-bit audio signal is composed of 8 frames,
Even if one frame has multiple channels according to the number of terminals, 8-bit audio data can be transmitted to multiple terminals without increasing the transmission speed. At this time, since the audio synchronization signal is used as the control signal, the audio information signal and other information signals are clearly distinguished. As a result, voice information signals and other information signals for terminals can be freely transmitted in the same format without requiring special audio hardware in the node.

In addition, by transmitting the audio synchronization signal at 8KH2, that is, each frame at 64 to 82 or more, the standard 8KHz
Can transmit 8-bit audio information signals. If each frame is transmitted at 64 KHz or higher, there will be room for a frame that accommodates an 8-bit audio information signal, and this frame can accommodate information signals other than the audio information signal. For example, if each frame is transmitted at 96 KHz, 4 frames or 4 bits are available for other information signals, allowing audio information signals and other information signals to be transmitted on the same channel of the frame.

Embodiments In FIGS. 1 and 2, 1 indicates a data group of one frame, and this data group 1 is composed of a control signal 2 and an information signal 3. Each signal has one clock bit 4 and one data bit 5.

In each area of the control signal 2, a "header" indicates the start of one frame. The "missing clock" identifies part of the previous header, and for this purpose clock bit 4 and data bit 5 are removed. "Audio synchronization signal" is used by terminal (telephone terminal) when transmitting voice data.
This is used to synchronize between frames, and as shown in FIG. 1, it becomes "1" once every two frames. The "boring bit" is a request bit for the control unit to communicate with the terminal, and the terminal that catches this "boring bit" can communicate with the control unit. rEX and COMJ are used for communication between the terminal and the control unit, and are usually "1".

Each area of Information Communication@3 is used to transmit data from terminals, and the one shown in Figure 2 has a configuration of 27 channels corresponding to 27 terminals, with 1 bit of information per channel. It can accommodate signals.

In FIG. 1, one frame is transmitted at 96KH2, for example, and data (information signals) of each channel are transmitted by time division multiplexing. The audio synchronization signal 6 is configured as an 8KH2 synchronization pulse. Therefore, in the case of FIG. 1, ρ=12, that is, the audio synchronization signal 6 appears every 12 frames.

As shown in FIG. 3, the audio data is composed of an 8-bit audio information signal 7, and one bit is accommodated in each of the subsequent 8 frames including the frame in which the audio synchronization signal 6 appears. This audio data is synchronized with the audio synchronization signal 6 and is passed between the control unit and the terminal or between each terminal.

As described above, when one frame is transmitted at 96KH2, and the audio synchronization signal 6 is used as an 8KHz synchronization pulse to transmit the 8-bit audio information signal 7, out of the 12 frames existing between the pair of audio synchronization signals 6, There is a blank space in 4 frames. Therefore, as shown in Figures 1, 13 and 4,
Normal terminal data can be accommodated in this empty space, and here the terminal data is composed of 4-pit information signals 8.

In order to transmit audio data, the frame transmission frequency needs to be 8 KHz x 8 bits = 64 KHz or higher, and by using a higher frequency than this, it becomes possible to transmit normal terminal data as described above. .

Since the audio data is transmitted under the control of the audio synchronization signal 6, it is clearly distinguished from other terminal data. Therefore, there is an advantage that audio data and terminal data can be freely transmitted in the same format, and there is no need for special audio hardware in the node. Further, as shown in the figure, audio data and terminal data can be transmitted together on the same channel.

Effects of the Invention As described above, according to the present invention, one
Since the audio information signal of bits is divided and transmitted, even if the number of channels in one frame is increased and the number of terminals is increased, the audio data can be transmitted without increasing the transmission speed excessively. Furthermore, since the audio data is transmitted under the control of the audio synchronization signal, it can be clearly distinguished from other terminal data, and there is no need for special audio hardware in the node.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a data transmission method based on an embodiment of the present invention, Fig. 2 is a detailed explanatory diagram of one frame in Fig. 1, and Fig. 3 is a detailed explanatory diagram of audio data in Fig. 1. figure,
FIG. 4 is an explanatory diagram of a conventional audio data transmission method. 6...Audio synchronization signal, 7...Audio information signal, 8...
-Other information signals. Agent Yoshihiro Moriki Figure 1 Terminal data Figure 2! Figure 3 1

Claims (1)

[Claims] 1. In one frame of signal group consisting of a control signal and an information signal, an area for a control signal for an audio synchronization signal, and an area for a control signal for an audio synchronization signal;
An area for audio information signals corresponding to bits is provided, and 8-bit audio data is configured by the signals in the audio information signal area in the subsequent 8 frames including the frame in which the signal appears in the audio synchronization signal area. A data transmission method characterized by: 2. The data transmission method according to claim 1, wherein the audio synchronization signal is an 8 KHz synchronization pulse. 3. In the information signal area between the frame where one audio synchronization signal appears and the frame where the next audio synchronization signal appears, following the 8-bit audio information signal, other information signals are accommodated. A data transmission method according to claim 1 or 2, characterized in that: