Gain difference from Mac OS 9 to Mac OS X
Gain difference from Mac OS 9 to Mac OS X
- Subject: Gain difference from Mac OS 9 to Mac OS X
- From: Andrew Taylor <email@hidden>
- Date: Mon, 24 Jun 2002 14:38:45 -0400
Hi,
We have a speech recognition application.
We use standard Sound Manager calls to open a device, get/set the
input channel gain and collect the input sound.
Input characteristics are quite simple: 16 bit integer, 16 khz, mono.
On Mac OS 9, we can set the gain so that USB microphones deliver
enough volume to do the processing we need to do.
On ALL versions of Mac OS X, this same method does not work. We can't
set the gain high enough to collect the same sound input levels.
What has changed in Sound Manager to deliver this different behavior
and what can I do about it?
thanks.
--
---------------------------
Andrew Taylor
Founder/CTO
MacSpeech, Inc.
<
http://www.macspeech.com>
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