Subject: Re: kern/18066: Clicking noise when recording audio using autri driver
To: None <>
From: IWAMOTO Toshihiro <>
List: netbsd-bugs
Date: 08/26/2002 15:00:56
At Sun, 25 Aug 2002 14:07:30 -0700 (PDT), wrote:
> By examining the wav file using WaveSurfer (now in pkgsrc as
> audio/wavesurfer), I found that the clicks occur 2400 samples apart,
> which corresponds to the block size of 4800 bytes reported by
> audioctl.  Each click consists of four samples of signal from several
> hundred milliseconds back, presumably from the previous cycle through
> the circular recording buffer.  Note that since the clicks consist of
> previously recorded signal, a recording of silence will not exhibit
> audible clicks.
> A waveform display of a typical click can be seen at

This seems to be quite similar to kern/16385 in two points:
 - the shape of clicking noise
 - no noise when recording silence,
although the clicks weren't periodical in my case.

So I guess the bug is in the common audio layer, not in autri or

IWAMOTO Toshihiro