On 23 Jan 2006, at 18:49, Bill Unruh wrote:
On Mon, 23 Jan 2006, Chris wrote:
On 23 Jan 2006, at 18:35, Bill Unruh wrote:
On Mon, 23 Jan 2006, Chris Birkinshaw wrote:
On 21 Jan 2006, at 15:24, Chris Birkinshaw wrote:
I have a M Audio Transit USB souncard, and have found
a high pitched noise comes out of my speakers when
starting jackd. This noise is not apparent when simply
playing through the device using alsaplayer.
Has anyone else got this? Has anyone else not got this
with their Transit?
In the end I fixed the problem by disabling audio input in my
jack startup line. Not sure why this would have been an issue!
Sounds like feedback. Ie, you have the input being fed to the
output which
is fed back to the input.
This wasn't the case, there was still noise present with nothing
connected to any inputs either physically or in jack. ie. the
noise appears as soon as jackd is started.
One of the features of feedback is precisely that the noise is
there even
with no input. As you know when the microphone squeals, the person
does not
need to be talking for the squeal to be there.
For feedback to work you have to have a loop in the system. Can you
explain where the loop is in my system as you have baffled me?
Additionally I have to disagree with your statement about feedback
with no input. With no input to a positive feedback loop there can be
no feedback (in your example the input is ambient noise in the room. )
Best regards,
Chris
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