Device, method and system for performing echo control to hand-free telephone

Abstract

The invention provides a device, a method and a system for controlling an echo to a hand-free phone. The device substantially comprises an echo canceller. The method substantially comprises the following steps: a remote voice signal of a receiving channel and a proximal voice signal of the transmitting channel are sampled, and according to energy of the obtained remote voice signal samples and the obtained proximal voice signal samples, communication state information of the current network is determined. According to the communication state information of the current network, the voice signal in the transmitting channel is processed with the echo controlling. By using the invention, the echo in the digital hand-free phone is eliminated effectively.

Description

technical field [0001] The invention relates to the field of communication, in particular to a device, method and system for echo control of a hands-free phone. Background technique [0002] Along with the development of communication technology, hands-free technology is used more and more widely in many communication products, such as security network, computer phone, conference call and PDA (personal digital assistant). Hands-free voice technology is also becoming more and more popular in access control systems, elevator voice systems and restaurant parking intercom systems. [0003] In a typical hands-free phone application scenario, if the speaker does not perform any processing when playing the audio signal, the audio signal played by the speaker will be picked up by the microphone of the hands-free phone and transmitted, causing the user of the hands-free phone to The user at the opposite end of the conversation heard his own echo, and in severe cases, it would cause ...

AI Technical Summary

Problems solved by technology

[0008] 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

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