Method for controlling echo of hand-free telephone

A hands-free phone and echo technology, applied in the field of communication, can solve the problems of increasing sampling and quantization errors, waste of hardware facilities, unsuitability, etc., to achieve the effect of eliminating echo, improving auditory experience, and ensuring the quality of communication services

Inactive Publication Date: 2008-09-24
北京泰得思达科技发展有限公司
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AI Technical Summary

Problems solved by technology

[0005] The shortcoming of the method in the above-mentioned prior art is: this method realizes half-duplex conversation through the control of hardware, suppresses echo, is suitable for analog communication system
For digital communication systems, all sound signals need to be sampled, quantized and encoded into a digital stream. If echo cancellation is implemented through hardware control, the error of sampling and quantization will increase.
In addition, a great advantage of digital communication lies in its easy modification, easy upgrade, and convenient system integration. The hardware discrimination controller used in this method will cover up this advantage of digital communication and cause a lot of waste in hardware facilities.
Therefore, this method is not suitable for hands-free calls in digital communication systems

Method used

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  • Method for controlling echo of hand-free telephone
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  • Method for controlling echo of hand-free telephone

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Embodiment Construction

[0013] In order to make the purpose, technical solutions and advantages of the present invention clearer, the implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings:

[0014] This embodiment provides a method for echo control in a hands-free phone.

[0015] see figure 1 , the method mainly includes the following steps:

[0016] Step 101 The voice detector samples the far-end voice and the near-end voice to determine the current network call status.

[0017] The voice detector first samples the input far-end voice and near-end voice, and judges the current network call status according to the short-term energy estimation value of the voice samples on the receiving channel and the sending channel.

[0018] If the short-term energy estimation value of the speech sample point at the current moment on the sending channel is greater than a certain fixed multiple of the maximum value of the short-term energy e...

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Abstract

The invention discloses a method for controlling echoes of a hand-free telephone, which essentially includes the steps that: a far-end speech signal on a receiving channel and a near-end speech signal on a sending channel are sampled; according to the energy of the samples of the far-end speech signal and the near-end speech signal, the information of communication state of a current network is confirmed; according to the information of the communication state of the current network, the speech signal on the sending channel is processed by a corresponding echo-control.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for echo control on a hands-free phone. Background technique [0002] In the prior art, a method for eliminating the echo of the hands-free phone is to use an automatic half-duplex technology solution. The schematic diagram of the scheme is as follows figure 1 shown. The specific process is as follows: [0003] An echo feedback suppression module is composed of a comparator and logic judgment, and the echo feedback suppression module realizes the function of a hardware discrimination controller. The above-mentioned echo feedback suppression module determines whether the transmitting channel is in the working state by comparing the signal of the transmitting channel with the size of the noise envelope; similarly, it determines whether the receiving channel is in the working state by comparing the signal of the receiving channel with the size of the noise envelope. [0004] W...

Claims

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Application Information

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IPC IPC(8): H04M1/20H04M1/58
Inventor 任忠宇季光
Owner 北京泰得思达科技发展有限公司
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