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Mute Detection Method in Internet Telephony

A technology of Internet telephony and mute detection, applied in the direction of telephone structure, etc., can solve the problems of ignoring the initiative of the talker, asynchrony of conversation, and poor adaptability to the environment.

Inactive Publication Date: 2002-11-13
INVENTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Simple use of short-term average energy to detect whether there is silence, poor adaptability to the environment;
[0006] 2. Simply filtering out the silent data without any processing may cause the asynchrony of the conversation;
[0007] 3. Half-duplex automatic conversion of speaking / listening mode, ignoring the initiative of the talker

Method used

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  • Mute Detection Method in Internet Telephony
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  • Mute Detection Method in Internet Telephony

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Embodiment Construction

[0030] refer to figure 1 Shown, the present invention is a kind of " mute detection method in network telephone ", and it comprises a personal computer 11, sound blaster card 12, microphone 13, loudspeaker 14, modem or network card 15 etc., wherein, microphone 13 is to The recorded sound signal is converted into an electrical signal and input to the Sound Blaster 12, and the speaker 14 converts the electrical signal output by the Sound Blaster 12 into a sound signal and sends it out. Refer to figure 2 , image 3 As shown, the general telephone call mode includes full-duplex mode (such as figure 2 shown) and half-duplex mode (such as image 3 As shown), the so-called full-duplex mode means that both parties can talk and listen at the same time. As for the half-duplex mode, it means that in the VoIP system, the Sound Blaster card is in half-duplex mode. At the current moment, only One of them is in the recording or playback state, but the recording or playback cannot be per...

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PUM

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Abstract

A method for detecting silence in Internet telephony, the steps are as follows: when the audio data of the current frame is collected, calculate its amplitude value and obtain the short-term average energy, and when the short-term average energy exceeds the critical value of speech energy, it means that the speech is detected , and then pass the short-term average energy of the current frame through a low-pass filter to obtain the long-term average energy of this frame and perform detection. When the long-term average energy of several consecutive frames is lower than the critical value of silence energy, the detection To silence, and then collect the audio data of the current frame, calculate the number of transformations of the positive and negative signs of adjacent data, once the zero-crossing rate exceeds the critical value, it is determined to detect noise.

Description

technical field [0001] The invention relates to a mute detection method in Internet telephone. [0002] The so-called silent detection method refers to the correct separation of voice and background noise through the various detection parts in the silent detection module in the Internet phone, so as to filter out redundant audio data, so as to obtain the best audio frequency within the limited network bandwidth. In addition, when it is detected that the voice data is not transmitted, it will transmit the silent frame data, which can save the transmission bandwidth compared with the voice data. At the same time, when the receiver receives the silent frame data, Background noise will also be played back, and the synchronization of speaking can be maintained. Secondly, there is a conversion module in the half-duplex speaking and listening mode. When receiving voice data on the network, it will automatically switch to answering mode. When the local When the voice is detected, it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M1/19
Inventor 张景嵩谢纲薛克忠温周斌
Owner INVENTEC CORP