Generating sidetone

[minghia]

Is it possible with the aax library to introduce sidetone from the captured stream? Or am I better off finding a hardware solution?

[adalinbv]

AeonWave supports the chorus effect which can add a signal with a delay of at most 0.07 seconds. I'm not familiar enough with the specifics of a sidetone to be sure that would be enough to simulate it: http://adalin.com/manual/aax_chorus_effect.html

It also supports frequency filters with a resonance factor higher than 1.0 which can be used to simulate the feedback resonance: http://adalin.com/manual/aax_frequency_filter.html

Erik

[adalinbv]

Taking a crash coarse sidetone phenomenon: I take it you are talking about wanted sidetone rather than unwanted one.

You can register a Sensor at the mixer (or an audio-frame) and automaticall mix the captured stream with the rest of the audio, but you can also treat the capture device as a standalone device. In which case you can retrieve the captured buffers one by one and handle them yourself but also feed them back the an emitter object by using aaxEmitterAddBuffer() function as demonstrated in the testcapture.c test utility.

I hope that helps.

Erik

[minghia]

Would the latency be noticeable using this method? That's why I think a hardware solution to sidetone maybe preferable.

[adalinbv]

This will add a delay of at least one frame-time which depending on the refresh-rate may be a problem or not. The default is around 43Hz on most systems but it can be set to a higher frequency if desired.