(this is a follow-up of https://forums.developer.amazon.com/questions/30898/alexa-voice-service-audio-sample-quality.html)
Question : Which is the PCM pre-processing allowed (signal processing operations) ?
For example: which is the acceptable digital level range ? which is the expected flatness of the frequency response of my microphone ? which is the expected amount of maximum noise and distortion ? Does an automatic gain control is allowed ? Can we design a pre-processing noise canceller ?
Best regards, Laurent.