Re: general architectural approach question
Re: general architectural approach question
- Subject: Re: general architectural approach question
- From: Brian Hall <email@hidden>
- Date: Thu, 16 Aug 2012 11:34:13 +1000
The usual approach to getting rid of background noise is an expander
or gate. A compressor actually raises the noise floor, making the
background noise more noticeable. You can still use a compressor, but
use highpass -> gate -> compressor.
On Wed, Aug 15, 2012 at 2:02 AM, Robert Spychala <email@hidden> wrote:
> Hi, I'm building a voice recording application for OS X and am looking
> into optimizing the audio quality of recorded voice with a macbook /
> iMac. I'm finding out that in most environments with ambient sounds
> (like AC, fans etc) there is a lot of hiss. All obvious things. The
> app doesn't do any live chat, so duplexing would not be used.
>
> My question is, what's the best approach for removing the hiss?
>
> 1) using kAudioUnitSubType_RemoteIO with an AUGraph of
> kAudioUnitSubType_MultiBandCompressor +
> kAudioUnitSubType_HighPassFilter to automatically clean up the
> recording?
>
> 2) using kAudioUnitSubType_VoiceProcessingIO only?
>
> 3) kAudioUnitSubType_VoiceProcessingIO + compressor and filter?
>
> Separately, the new Mac Book Airs have beam forming built in with the
> dual microphones. Will that work with
> kAudioUnitSubType_VoiceProcessingIO only? or also for
> kAudioUnitSubType_RemoteIO and general recording.
>
> thanks
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