Acoustic Signal Processing for Speaker-Feedback and Echo Suppression
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Solution Overview
Problem
Acoustic systems face issues with acoustic feedback, such as howling and echo, due to the collection of sound emitted by the speaker by the sound sensor, leading to discomfort and interference.
Innovation Solution
A signal processing method utilizing a sound sensor module with multiple sound sensors and a signal processing circuit to generate a composite signal by performing targeted operations on signals from different frequency bands, reducing speaker-derived components by aligning the zero sound pickup direction with the speaker, thereby suppressing howling or eliminating echo.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sound sensor collects ambient sound including speaker output for amplification and playback, then the hearing compensation function is achieved, but acoustic feedback and howling occur due to the closed-loop circuit
Solution Approach 1:
The patent extracts and removes the speaker-derived signal component from the composite signal collected by the sound sensor. By identifying and eliminating this harmful component through signal processing operations, the closed-loop feedback causing howling is broken while preserving the useful ambient sound for hearing compensation.
Solution Approach 2:
The patent utilizes the recaptured speaker signal, which was originally causing harmful feedback, to generate a reference signal. This reference signal is then processed and subtracted from the composite signal, converting the harmful feedback path into a beneficial echo cancellation mechanism.
2Loss of information
If the sound sensor captures all ambient sound including speaker output, then complete ambient sound information is obtained, but echo interference occurs in telephone and conference systems
Solution Approach 1:
The patent extracts the speaker-derived component from the complete ambient sound signal. By removing this specific component through signal processing, the echo causing interference is eliminated while retaining all other useful ambient sound information for accurate transmission to the remote end.
Solution Approach 2:
The patent introduces a reference signal derived from the speaker output as an intermediary element. This reference signal serves as a mediator that enables the identification and cancellation of echo components in the composite signal without losing other ambient sound information.
Data Source
AI summary
A signal processing method and an acoustic system are provided. The method comprises: obtaining a first signal and a second signal, where the first signal is obtained by collecting an ambient sound when a first sound sensor in a sound sensor module is operating, and the second signal is obtained by collecting the ambient sound when a second sound sensor in the sound sensor module is operating, the ambient sound at least comprises a target sound output by a speaker module during operation; performing a first target operation on the first signal and the second signal to generate a composite signal, and further performing a second target operation on the composite signal, where the composite signal is a composite signal of a signal in a first frequency band and a signal in a second frequency band.