linuxaudio.org

At Sat, 27 Oct 2012 16:18:43 +0800,

James Harkins wrote:

quoted text
> Has anyone else had this problem? For some pieces using live mic input, I wanted to reduce latency

> by pulling the Jack IO buffer size down to 512 samples from the default 1024. (I also tried 256

> samples, but that just made Jack crash.)

>

> But with the smaller buffer, the mic gets an additional 30-40 dB of gain, making the input

> unusable. If I turn the preamp on the fast track down very very low and speak quietly into the

> mic, the sound comes through without obvious distortion or glitches, so it doesn't seem to be an

> xrun thing. But it distorts very easily and very badly.

>

> If I switch back to 1024 samples, the problem disappears.

Just reconfirming this issue -- with 512 samples in the hardware buffer, the noise floor was about -20 dB. At 1024 samples, it was -70 dB.
Baffled (and, I guess, resigned to 46.4 ms latency in my concert...),
hjh
--

James Harkins /// dewdrop world

jamshark70@dewdrop-world.net

http://www.dewdrop-world.net
"Come said the Muse,

Sing me a song no poet has yet chanted,

Sing me the universal."  -- Whitman
blog: http://www.dewdrop-world.net/words

audio clips: http://www.dewdrop-world.net/audio

more audio: http://soundcloud.com/dewdrop_world/tracks

_______________________________________________

Linux-audio-user mailing list

Linux-audio-user@lists.linuxaudio.org

http://lists.linuxaudio.org/listinfo/linux-audio-user