JPH036940A - Transmitter - Google Patents

Abstract

PURPOSE:To efficiently transmit media with different transmission speeds by insetting a time fill to a no-sound time when no-sound is detected from compressed voice information and composing the sound information with the time fill inserted thereto into a cell and sending the cell. CONSTITUTION:When sound information in the unit of 64kb/s is transmitted from a PBX 10 to a voice compression and expansion circuit 12 via a PCM highway 11, the voice compression and expansion circuit 12 compresses the sound information into the sound information in the unit of 32kb/s or 16kb/s, etc., and outputs the resulting information to a no-sound detection circuit 13. Upon the detection of no sound, the no-sound detection circuit 13 outputs no information to a cell composition decomposition circuit 14. The cell composition decomposition circuit 14 composes the information from the no sound detection circuit 13 into a cell in total in 69 octets composed of the header of 5 octets and information part in 64 octets and transmits the cell to an opposite transmitter. When the cell is less than the 69 octets, a time fill generated from a time fill generating circuit 17 is inserted to combine the cell.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transmission device for transmitting various media such as voice, data, and images.

Conventional technology FIG. 2 shows the configuration of a conventional transmission device.

In FIG. 2, 30 is a private branch exchange (PBX), 31
is a 2Mb/s PCM highway, 32 is a 2Mb/s
The audio compression/expansion circuit 32 is connected to the PBX 30 via the PCM highway 31 of S.
connected to.

Next, the operation of the above conventional example will be explained.

In Figure 2, audio information in units of 64 Kb/s is PB
When the audio information is transmitted from the The information is multiplexed onto media such as data and images, and sent to the other party's transmission device via the high-speed digital private line interface 33 and the high-speed digital private line 34.

On the other hand, audio information that has been compressed and multiplexed in units of 32 Kb/s, 16 Kb/s, etc. is transmitted from the other party's transmission device to the audio compression/expansion circuit 32 via the high-speed digital dedicated line 34 and the high-speed digital dedicated line interface 33. Then, the audio compression/expansion circuit 32 converts this audio information into 64 Kb
The expanded audio information is sent to the PBX 30 via the PCM highway 31.

Therefore, according to the conventional example, various media such as audio, data, and images can be transmitted by compressing and multiplexing audio.

Problems to be Solved by the Invention However, in the conventional transmission device described above, regardless of the amount of information to be transmitted or the transmission speed of the terminal, it must be compatible with the transmission speed of the channel allocated in the time division multiplex frame. In many cases, 32Kb/s units, 16Kb
There is a problem in that it is not possible to achieve a transmission speed of /s or the like.

Furthermore, when transmitting voice, even when there is no voice, it is transmitted as information, so it must always be transmitted at the same speed, and therefore there is a problem that voice cannot be transmitted efficiently.

In view of the above conventional problems, it is an object of the present invention to provide a transmission device that can efficiently transmit media having different transmission speeds.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention inserts a time fill in the silent time when silence is detected from compressed audio information, and the audio into which this time fill is inserted is Information is assembled into cells and transmitted.

Effect of the Invention With the above configuration, the present invention assembles audio information into cells, so it can be multiplexed and transmitted with media having different transmission speeds.In addition, since no information is transmitted during audio silence, audio information can be efficiently transmitted. can be transmitted to.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a transmission device according to the present invention.

In FIG. 1, 10 is a private branch exchange (PBX), 11
is a 2Mb/s PCM highway, 12 is a 2Mb/s
This is an audio compression/expansion circuit connected to the PBXIO via the PCM highway 11 of S.

13 is a silence detection circuit that detects silence from the audio information compressed by the audio compression/expansion circuit 12, and the silence detection circuit 13 does not output any information when it detects silence. 14 assembles the information from the silence detection circuit 13 into packets (cells) with a short message length, and sends the information to the high-speed digital private line 1 via the high-speed digital private line interface 15.
This is a cell assembly/disassembly circuit for disassembling cells that are transmitted to 6 or transmitted from the high-speed digital private line 16 to the high-speed digital private line interface 15, and the transmission equipment on the other side is similarly configured.

17 is a time fill generation circuit that generates time fill and white noise; 18 is a circuit 1 through which data, images, etc. are transmitted;
0 Mb/s L A N <Local Area
Netw.

rk) L for connecting 19 and cell assembly/disassembly circuit 14
It is an AN interface, and the cell assembly and disassembly circuit 14 similarly assembles transmission data, transmission images, etc. from the LAN interface 18 into cells and transmits them, and disassembles cells of reception data, reception images, etc., and sends them to the LAN interface 18.
Output to.

Next, the operation of the above embodiment will be explained.

In Figure 1, audio information in units of 64 Kb/s is PB
When the audio information is transmitted from the XIO to the audio compression/expansion circuit 12 via the PCM highway 11, the audio compression/expansion circuit 12 compresses this audio information into audio information in units of 32 Kb/s, 16 Kb/s, etc. Output to 13.

When the silence detection circuit 13 does not detect silence, it outputs the compressed audio information as it is to the cell assembly and disassembly circuit 14, and when it detects silence, it does not output any information to the cell assembly and disassembly circuit 14. .

The cell assembly/disassembly circuit 14 assembles the information from the silence detection circuit 13 into a total of 69 octets of cells consisting of a 5-octet header and a 64-octet information section, and sends the information via the high-speed digital dedicated line interface 15 and the high-speed digital dedicated line 116. Transmit to the other party's transmission device. here,
If the length is less than 69 octets, the time fill generated by the time fill generation circuit 17 is inserted to assemble the cell.

On the other hand, when the cell assembly and disassembly circuit 14 receives a cell from the transmission device of the other party via the high-speed digital leased line 16 and the high-speed digital leased line interface 15, the cell assembly and disassembly circuit 14 disassembles the cell into voice information, It is output to the time fill generation circuit 17.

When the time-fill generation circuit 17 receives audio information for a certain period of time, it outputs the audio information as it is to the audio compression/expansion circuit 12, and when it does not receive audio information for a certain period of time, it time-fills and fills the white noise. continuous audio information is output to the audio compression/expansion circuit 12.

The audio compression/expansion circuit 12 converts this audio information into 64Kb/s.
unit of audio information, and this expanded audio information is P.
It is sent to PBXlo via CM Highway 11.

Data and image packets input from the LAN 19 via the LAN interface 18 are assembled into cells by the cell assembly/disassembly circuit 14, multiplexed with audio information, and sent to the transmission device on the other end via the high-speed digital dedicated n16. Transmit. In addition, data and image cells from the other party's transmission device are disassembled into packets by the cell assembly and disassembly circuit 14, and sent to the LAN 19 via the LAN interface 18.
transmitted to.

As described in detail, the present invention inserts a time fill into the silent time when silence is detected from compressed audio information, and assembles the audio information into which the time fill has been inserted into cells. , so that media with different transmission speeds can be efficiently transmitted.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a transmission device according to the present invention, and FIG. 2 is a block diagram showing a conventional transmission device. 12... Audio compression/expansion circuit, 13... Silence detection circuit, 14... Cell assembly/disassembly circuit, 17... Time fill generation circuit, 18... LAN interface.

Claims (4)

[Claims] (1) An audio compression means for compressing transmitted audio information; and when silence is detected from the audio information compressed by the audio compression means, a time fill is inserted into the silent time, and this time fill is inserted. Assemble audio information into cells,
A transmission device having means for transmitting. (2) means for decomposing audio information compressed and assembled into cells; and means for inserting white noise into the time when there is no audio information in the decomposed information and outputting it as continuous audio information; , means for decompressing the continuous audio information. (3) The transmission device according to claim (1), wherein the audio information is multiplexed with data and transmitted. (4) The transmission device according to claim (2), wherein the transmission device receives and separates multiplexed audio information and data.