Near field sound source real-time positioning system based on microphone array
A microphone array and real-time positioning technology, which is applied in positioning, radio wave measurement system, measuring device, etc., can solve problems such as unsatisfactory, and achieve the effects of improving operating efficiency, improving real-time performance, and reducing the amount of calculation
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[0044] In the microphone array and its amplifying circuit, the electret microphone adopts the NMI9745 electret microphone, and the amplifier adopts the MAX9814L microphone special amplifier, according to image 3 Schematic connections of a single electret microphone and its amplifying circuit shown in .
[0045] When the AGC module inside the MAX9814L detects that the output voltage exceeds a preset threshold, it will reduce the gain according to an optional time coefficient. This time constant is called "Attack Time". When the signal output amplitude decreases, the gain will remain in a reduced state for a short time, this time is called "Hold Time". followed by a slow increase to the normal value, this time is called
[0046] "Release Time". The time factor for reducing the gain t attack It can be obtained by the following formula.
[0047] t attack =2400×C CT
[0048] Attack Time (t attack ) and Release Time (t release ) ratio t attack / t release , A / R pin state ...
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