JPH0364235A - Voice packet assembling/disassembling system - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency and the voice quality by stopping the operation of a coder when a silent part of the sound signal is discriminated. CONSTITUTION:The silent part of the sound signal inputted from an input terminal 3 is discriminated by a voice discriminating device. Then the action control signal (a) of a coder 7 is outputted and a coder 7 stops its coding action as well as its output. Therefore a packet does not reach a voice packet disassembler 9 and the action control signal (b) of a decoder 10 is outputted from the disassembler 9. Thus the decoder 10 stops its decoding action and its output, and no output is received from an output terminal 4. Thus only the voice part of the packet is transmitted. Consequently, the transmission efficiency is improved together with the improvement of the voice quality since the coincidence is always secured between the actions of the coder 7 of the transmission side and the decoder 10 of the reception side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an audio packet assembly and disassembly system for packetizing and transmitting audio signals.

[Conventional technology]

Conventionally, audio packet assembling and disassembling devices in this type of system either packetize voice signals without regard to voice or silence, or compress silent portions and transmit them as special silent packets.

[Problem to be solved by the invention]

As mentioned above, the audio packet assembling and disassembling device in the conventional system packetizes all audio signals regardless of whether they are voiced or silent, so meaningless silent signals are also packetized, and in the packet method, the information to be transmitted tends to be Adding a header results in an increase in the amount of transmitted information and a deterioration in transmission efficiency. Also, by compressing the silent part and making it into a special silent packet, the amount of transmitted information is reduced,
Fluctuations in the arrival time of packets cause the transmitting encoder and receiving decoder to be out of synchronization, degrading the quality of the audio signal.

SUMMARY OF THE INVENTION An object of the present invention is to provide a system having a voice packet assembly/disassembly device that has good transmission efficiency and can improve voice quality.

[Means to solve the problem]

The voice packet assembly and disassembly system of the present invention includes: a voice discriminator that discriminates between voiced and silent portions of a voice signal; a delay device that delays the voice signal in accordance with a discrimination processing time of the voice discriminator; an encoder that encodes the audio signal from the encoder; and a packet assembler that assembles the audio signal from the encoder into packets, and when the audio discriminator determines a silent part of the audio signal, the code The output of the encoder is stopped at the same time as the output of the encoder is stopped, and when the voice discriminator determines the voice portion of the voice signal, the encoder is operated to generate the packet containing only the voice portion of the voice signal. a transmitting device that transmits; a packet disassembler that disassembles the received packet; and a decoder whose operation is controlled to decode only the voiced portion of the audio signal from the packet disassembler. and a side device.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1 showing an embodiment of the present invention, a voice packet assembly/disassembly bag W1 on the transmitting side having an input terminal 3 for voice signals is connected to a voice packet assembly and disassembling bag W1 on the receiving side having an output terminal 4 for voice signals via a communication line 11. It is connected to the voice packet assembly/disassembly device 2. The audio packet assembling and disassembling device 1 on the transmitting side includes a voice discriminator 6 that analyzes the voice signal and discriminates between a voiced part and a silent part of the voice signal, and a voice discriminator 6 that analyzes the voice signal and discriminates the voice signal according to the discrimination processing time of the voice discriminator 6. Delay device 5 to delay and this delay device 5
and an audio packet assembler 8 that assembles the encoded audio signal into packets together with control information. On the other hand, the audio packet assembling and disassembling device 2 on the receiving side includes an audio packet decomposer that decomposes received packets, and a decoder 10 that decodes the audio signal output from the decomposer 9.

In a system having such a configuration, when an audio signal is input to the audio signal input terminal 3, the audio signal is delayed by the delay device 5 by the discrimination processing time of the audio discriminator 6, and then sent to the encoder 7.
is input. The sound portion of the audio signal input from the audio signal input terminal 3 is encoded by the encoder 7, and assembled into packets by the audio packet assembler 8.The assembled packets are used for communication. The audio data is transmitted to the voice packet decomposer 9 via the line 11, where the packets are decomposed. Further, the decoder 10 decodes the signal into an audio signal, and outputs the audio signal from the audio signal output terminal 4.

The silent portion of the audio signal input from the audio signal input terminal 3 is determined by the audio discriminator 6 to be silent, and the operation control signal a of the encoder 7 is output. This signal a
The encoder 7 that has received the signal stops its encoding operation and also stops its output. The audio signal to be packetized from the encoder 7 that has stopped operating is not input to the audio packet assembler 8, nor is it sent out as a packet to the communication line 11.

Therefore, since the packet does not arrive at the audio packet decomposer 9, the audio packet decomposer 9 outputs an operation control signal for the decoder IO. Decoder 1o that received this signal
, the decoding operation is stopped and the output is also stopped, and the output from the audio signal output terminal 4 becomes silent.

When the audio signal input from the audio signal input terminal 3 changes from silent to active, the audio discriminator 6 determines that it is active, and the encoder 7 is driven by the operation control signal a of the encoder 7. The encoding operation continues while the output is stopped.

As a result, when the audio packet decomposer 9 receives a packet, it drives the decoder 1o with the operation control signal of the decoder 10, and the decoding operation continues from the state where the output is stopped.

Although not shown in FIG. 1 showing the configuration of this embodiment, each of the audio packet assembling and disassembling devices 1.2 includes a transmitting function section and a receiving function section.

〔Effect of the invention〕

As explained above, the present invention detects speech and silence in an audio signal, and when there is silence, stops the operation of the encoder and decoder, stops the output of the encoder and decoder, and stops packetization, By configuring the encoder and decoder to continue operating from the state in which the encoder and decoder stopped output when the transition to voice activity occurs, the only packets to be transmitted are the voice area, which improves transmission efficiency. In addition, the operation of the transmitting side encoder and the receiving side decoder can be always synchronized to improve the voice quality.

Input terminal, 4... Output terminal, 5... Delay device, 6... Voice discriminator, 7... Encoder, 8...・Audio packet assembler, 9...
・Audio packet decomposer, 10...decoder, 11.
...Communication line.

Claims (1)

[Claims] a voice discriminator that discriminates between voiced and silent portions of the voice signal;
a delay device that delays the audio signal in accordance with the discrimination processing time of the audio discriminator; an encoder that encodes the audio signal from the delay device; and assembles the audio signal from the encoder into packets. a packet assembler, which stops the operation of the encoder and stops the output of the encoder when the voice discriminator determines a silent part of the voice signal; a transmitting device that operates the encoder to transmit the packet of only the sound portion of the audio signal when a sound portion is determined; a packet decomposer that decomposes the received packet; and a packet decomposer that decomposes the received packet; 1. A voice packet assembly and disassembly system comprising: a receiving side device comprising a decoder whose operation is controlled so as to decode only the voiced portion of the voice signal.