Self-excitation eliminating method of high gain public address system based on space counteracting
A technology of self-excitation elimination and amplification system, applied in the direction of transducer acoustic response prevention, etc., can solve the problems of unable to eliminate howling, limit system amplification gain, reduce and so on.
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[0038] The present invention will be described in detail below through specific implementation in conjunction with the accompanying drawings.
[0039] Such as figure 1 As shown, the microphone input signal is processed by the processing module and then output by the two speakers A and B, which cancel each other at the microphone (indicated by a cross). The processing principle of the processing module is as follows: figure 2 As shown, the processing module mainly includes: AD conversion, frequency slicing part, weight adjustment part, superposition and merging part, and output after DA conversion. The specific implementation steps are as follows:
[0040] The howling elimination method of the present invention needs to be debugged with a single-frequency signal before application. At this time, the position of the microphone and speaker is fixed.
[0041] (1) Debugging stage
[0042] a. The processing module controls speakers A and B to send out stable N single-frequency...
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