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Echo cancellation two-way voice talk back equipment

A technology of echo cancellation and voice intercom, applied in the direction of two-way sound reinforcement telephone system, two-way line system station, etc., can solve the problem of line echo and other problems, and achieve the effect of eliminating echo and reducing elimination time.

Inactive Publication Date: 2012-04-11
杭州艾力特音频技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 3. Since it cooperates with various hardware devices at the back end, it not only includes acoustic echo, but also line echo is more likely to exist, so it needs to be able to solve the line echo cancellation function

Method used

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  • Echo cancellation two-way voice talk back equipment
  • Echo cancellation two-way voice talk back equipment
  • Echo cancellation two-way voice talk back equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 , 2 , shown in 3, a kind of echo cancellation two-way voice intercom equipment, comprises audio frequency input module, loudspeaker driver module, echo cancellation module, noise reduction squelch module, speech delay module and audio frequency output module, the output end of audio frequency input module respectively It is connected with the input end of the speaker drive module and the echo cancellation module, the output end of the echo cancellation module is connected with the input end of the noise reduction and squelch module, the output end of the noise reduction and squelch module is connected with the input end of the voice delay module, and the voice delay The output end of the timing module is connected with the input end of the audio output module. The audio input module includes a voice signal input module, an audio input interface module, an electrostatic protection module and a level signal automatic adjustment module. The echo cancella...

Embodiment 2

[0036] Such as figure 1 , 2 . As shown in 3, the echo cancellation two-way voice intercom device requires two external voice signals for interaction, one is the uplink sound, and the other is the downlink sound. Since it may be connected to different audio devices, special features are added here The input and output interface modules mainly carry out a circuit protection inside, including static electricity protection, signal reverse connection protection, etc., and also include impedance matching circuits, which can match with different external input and output impedances, and can adjust audio gain and audio volume. , to ensure the normal operation of the device. After the downlink sound passes through the audio input module, one path is sent to the speaker driver module to drive the speaker to play the sound, and the other path is used as an audio reference signal to be input to the echo cancellation module, as a guarantee for the normal operation of the echo cancellation...

Embodiment 3

[0038] Such as figure 1 , 2 . As shown in 3, a two-way voice intercom device with echo cancellation, the voice signal is transmitted to the speaker driver module and the echo cancellation module through the audio input module.

[0039] The echo cancellation module includes an adaptive filter echo cancellation module and a nonlinear processing module. The adaptive filter echo cancellation module first performs echo cancellation, and the peak signal is often unable to be completely eliminated. The latter stage of nonlinear processing mainly performs echo cancellation on the echo that has not been completely eliminated in the previous stage, and mainly eliminates the peak signal of the echo, that is, the energy location. The combination of the two, because of the echo cancellation of the latter stage, can shorten the echo cancellation action time of the previous stage, can properly omit the echo, and use the shorter time of the latter stage to eliminate the spike signal. In th...

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Abstract

The invention discloses echo cancellation two-way voice talk back equipment which comprises an audio input module, a horn drive module, an echo elimination module, a noise-reducing and silencing module, a voice delay module and an audio output module. The echo cancellation two-way voice talk back equipment has the beneficial effects that the echo elimination module ensures bidirectional voice call at a distance of furthest 3m and eliminates echo and squeal; input audio control is completed through an automatic gain control algorithm of the echo elimination module, conditions of no remarkable fluctuation, small voice volume difference, no distortion and the like do not exist in sound in a distance of 1-3m; the noise is reduced by 10Db through the noise-reducing and silencing module, and a time domain and a frequency domain noise analyzing modules, environment noise is eliminated, and echo noise is further reduced; and voice is delayed through a voice delay module, sound of amplified by a speaker is avoided being overlapped with sound acquired by a microphone to cause incapability of accurately confirming an echo signal.

Description

technical field [0001] The invention relates to an echo canceling two-way voice intercom device, in particular to an echo canceling two-way voice intercom device in the field of security voice communication. Background technique [0002] Nowadays, most voice intercom devices cannot be used as independent voice intercom terminal equipment, and cooperate with back-end hard disk video recorders (DVR), IP network cameras, optical transceivers, voice boards, etc., resulting in cost and cost in engineering applications. The costs are relatively high. And the effect of most intercom systems can only meet the distance of about 1 meter, and the intercom distance has a relatively large limit. Moreover, the voice intercom equipment often has echoes and howling phenomena during the intercom process, which makes the intercom unable to proceed normally. The echo component is caused by the receiving signal flowing into the path of the sending signal through the hybrid circuit. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q5/24H04M9/08
Inventor 孙云云叶树明
Owner 杭州艾力特音频技术有限公司
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