We’ve been doing Digital all wrong……. One microphone is not enough and ten is too many.
To fix digital voice communications we had to go back to the beginning.
Back to analogue to fix a very digital problem and create a new analogue input signal before its converted to digital and sent to the Digital Signal Processor.
How did we do this? Two microphones and a summing circuit. We knew something they said couldn’t be done. Run an Electret Microphone backwards, in reversed polarity. Just like a speaker that’s wired in reverse polarity, the secondary microphones output signal is reduced and inverted to the main voice microphones output signal.
Well, what does this all mean?
It means that the Digital Signal Processor (DSP) of you Digital Device receives a new and complex signal that’s both positive and negative and has two sound levels. This signal is what the DSP needs to receive to work at its peak.
This complex and unique AFA microphone output signal is sent to the ADC (Analogue to Digital Converter), converted to Digital and then over to the DSP of your device for processing.
The DSP sees the negative signal and its lower sound level (ambient noise) and pushes it down, suppressing it even further. It also sees the positive and higher noise level signal (voice) and understands that this is the signal to clean, enhance, and amplify.
This process happens in milliseconds and the DSP’s Digital output signal is a voice that is natural and clearer than ever before.