Re: Reducing input sensitivity on external microphone
Re: Reducing input sensitivity on external microphone
- Subject: Re: Reducing input sensitivity on external microphone
- From: tahome izwah <email@hidden>
- Date: Sat, 14 Jan 2012 18:02:05 +0100
Usually you would do this at the mic's preamp, ie in hardware. I'm not
sure if this can be done in software - if the samples are clipped it's
too late to do anything about it.
--th
2012/1/13 Chris Gilpin <email@hidden>:
> Hello, first time poster and new to Obj. C programming, so bear with me.
>
> I am creating an application that uses an external contact (throat)
> microphone which plugs into the headphone jack. I measure the peak and
> average volume levels from an AudioQueue which works great, except when I
> reach vocal levels of ~90db (as measured using an SPL meter) both the peak
> and average values truncate at 1.00.
>
> Is there a way I can reduce the input sensitivity or gain on this external
> throat microphone (similar to the input volume slider in OS X System
> Settings - Sound) so that I can differentiate between 90 and 100dBs?
>
> I am currently using AudioQueues, but am happy using any library or code
> that lets me measure input volume from the external microphone.
>
> Thank you so much for taking the time to read this, and I anxiously await
> your feedback.
> Chris
>
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