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Practical sound signal pick-up device for acoustic echo cancelled system sound source

A technology of sound signal and acoustic echo, applied in two-way sound reinforcement telephone system, interconnection device, frequency/direction characteristic device, etc., can solve the problem of echo cancellation and other problems

Inactive Publication Date: 2006-07-12
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If we still use the input signal of the speaker as the echo estimation signal for acoustic echo cancellation, the effect of echo cancellation will not be achieved

Method used

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  • Practical sound signal pick-up device for acoustic echo cancelled system sound source
  • Practical sound signal pick-up device for acoustic echo cancelled system sound source
  • Practical sound signal pick-up device for acoustic echo cancelled system sound source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 2 As shown, a conventional loudspeaker 3 and its sound box 2 are adopted, the model of the loudspeaker 3 is not limited, and the shape and size of the sound box 2 have no special requirements, which are common types in the market; a low-sensitivity microphone 1 is placed in the sound box, and the microphone 1 Sensitivity is 20-30dB lower than common microphones on the market, and the fixing method of microphone 1 is not limited, so as not to affect its performance; the lower sensitivity sensor 1 can work in a linear state in the speaker, and its output electrical signal is Highly correlated with the actual sound signal from speaker 3

Embodiment 2

[0023] Such as image 3 As shown, a conventional loudspeaker 3 and its sound box 2 are adopted, the model of the loudspeaker 3 is not limited, and the shape and size of the sound box 2 have no special requirements, and they are all common types in the market; a small cavity 4 is separated from the back cavity of the sound box 2, The small cavity 4 uses wooden partitions to attenuate the sound from the large cavity 6 to the small cavity 4 by 20-30dB. The thickness, position and fixing method of the partition are not limited, as long as the expected sound insulation is achieved; An ordinary microphone is placed in the middle as the microphone 1. The type of the microphone is not limited, and all common microphones on the market can be used.

Embodiment 3

[0025] Such as Figure 4 As shown, a conventional loudspeaker 3 and its sound box 2 are adopted. The model of the loudspeaker 3 is not limited, and the shape and size of the sound box 2 have no special requirements. They are all common types in the market; Shell 5, shell 5 should make the sensitivity of ordinary microphone 1 lower than 20~30dB when not doing treatment at this moment; The input microphone 1 shall prevail, and the fixing position and method of the housing are not limited; in this way, the common microphone 1 can work in a linear range.

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Abstract

Present invention discloses a pickup device for picking up speaker practical sound signal. Said device includes speaker, microphone in sound box, said speaker receiving peripheral equipment inputted electrical signal, and converting electrical signal to sound signal outputting, said microphone for picking up speaker practical sound signal and outputting relevant electrical signal. Said invention can pick up truth sound signal and outputting relevant electrical signal no matter speaker works on linear state or non linear state for acoustic resonance bucking-out system tone source.

Description

technical field [0001] The present invention relates to an actual sound signal pickup device for the sound source of the acoustic echo cancellation system, in particular to a sound source signal pickup device capable of picking up the actual sound signal of the speaker when it is in a linear or nonlinear working state. Background technique [0002] In the car, use the hands-free phone to enable the driver to drive with both hands while talking through the cellular phone conveniently, which can avoid the danger of traffic accidents that may be caused by the driver holding the phone and driving with the other hand. Many countries have or soon will legally require drivers to use only hands-free phones while driving. In the office, teleconferencing can allow many people in several distant places to hold a meeting together instead of gathering them together, which not only saves a lot of time and travel expenses, but also greatly improves work efficiency. At least one conference...

Claims

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Application Information

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IPC IPC(8): H04R1/22H04R1/28H04M9/08
CPCH04M9/082
Inventor 程晓斌徐健李晓东马新来
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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