Re: CoreAudio: Calculate total latency between input and output with kAudioUnitSubType_VoiceProcessingIO
Re: CoreAudio: Calculate total latency between input and output with kAudioUnitSubType_VoiceProcessingIO
- Subject: Re: CoreAudio: Calculate total latency between input and output with kAudioUnitSubType_VoiceProcessingIO
- From: Paul Davis via Coreaudio-api <email@hidden>
- Date: Tue, 21 Jan 2020 15:57:42 -0700
On Tue, Jan 21, 2020 at 3:36 PM Brian Schachter via Coreaudio-api <
email@hidden> wrote:
>
>
> > The most reliable way to do this is to actually measure it. Not
> necessarily the most convenient, however. In Ardour we make this
> measurement optional - users will get better capture alignment if they do it
>
> Do you play a metronome out of the speaker (output) while simultaneously
> recording it with the mic (input) and afterwards look at the peaks in the
> recorded data? If so, is this method of measuring impossible if the user is
> wearing headphones? When the output is headphones... the mic won't be able
> to pick it up.
>
Correct. If you want to do the most accurate measurement, you need to be
able to detect and measure the signal via a "loopback" signal flow. That's
why I noted "not necessarily the most convenient".
>
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