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AR: use bandpass filter for analog input

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Many bad quality analog mics are not centered properly at 1.6V, but stuck at 0V or stuck at 3.3V in silence. The bandpass filter removes DC offsets and improve signal quality.
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Frank 2023-09-23 16:48:45 +02:00 committed by GitHub
parent eb66a403d9
commit 438525e8ec
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usermods/audioreactive/audio_reactive.h
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@ -1175,6 +1175,7 @@ class AudioReactive : public Usermod {
DEBUGSR_PRINTLN(F("AR: Analog Microphone (left channel only).")); DEBUGSR_PRINTLN(F("AR: Analog Microphone (left channel only)."));
audioSource = new I2SAdcSource(SAMPLE_RATE, BLOCK_SIZE); audioSource = new I2SAdcSource(SAMPLE_RATE, BLOCK_SIZE);
delay(100); delay(100);
useBandPassFilter = true; // PDM bandpass filter seems to help for bad quality analog
if (audioSource) audioSource->initialize(audioPin); if (audioSource) audioSource->initialize(audioPin);
break; break;
#endif #endif