Search found 9 matches

by radar_5
Thu Nov 19, 2009 11:35 am
Forum: Linux
Topic: oss4 and number of wakeups in powertop
Replies: 5
Views: 10164

Re: oss4 and number of wakeups in powertop

is there some fundamental technical reason for these high numbers? In ALSA, I can control number of wakeups by setting fragment size, so if I set fragment size for example to 4096 and samplerate to 44100, I will get about 10 wakeups/s (and this of course will increase latency but i'm perfectly fine ...
by radar_5
Fri Nov 13, 2009 8:56 pm
Forum: Linux
Topic: oss4 and number of wakeups in powertop
Replies: 5
Views: 10164

Re: oss4 and number of wakeups in powertop

OK, here are some numbers: OSS4 build 2002 just after the installation: 375 wakeups/s from oss_hdaudio module vmix deactivated: 86 wakeups/s vmix attached (sudo vmixctl -M /dev/oss/oss_hdaudio/pcm0): 187 wakeups/s Each time I've tested with 3 different players (mocp, mplayer, xmms), number of wakeup...
by radar_5
Mon Nov 09, 2009 1:49 pm
Forum: Linux
Topic: oss4 and number of wakeups in powertop
Replies: 5
Views: 10164

oss4 and number of wakeups in powertop

I've recently discovered that nice tool and now i'm kind of obsessed with getting low wakeup numbers :twisted: . Because of that my long favourite xmms had to go, as it generates around 120 wakeups/s even if you don't play anything and switch off animations.. (lots of gettimeofday() calls...) So I'm...
by radar_5
Wed Oct 28, 2009 1:10 am
Forum: Linux
Topic: OSS4 sampling rate
Replies: 11
Views: 23793

Re: OSS4 sampling rate

Ok I did your 10hz + 20khz test - I didn't hear any sound when both PureData and /dev/dsp had the same sampling frequency. - there was lot of popping when sampling frequencies did not match - im getting older, cannot hear anything above 14khz :oops: (or is it my cheap earphones..) that was really in...
by radar_5
Wed Oct 28, 2009 12:34 am
Forum: Linux
Topic: OSS4 sampling rate
Replies: 11
Views: 23793

Re: OSS4 sampling rate

are you talking about harmonic distortions caused by compression? and that vmix uses "soft clipping"? I think the popping sounds I've heard was not related to compression but to 44100->48000 resampling, I don't know how it is done in OSS4 but I guess if the interpolation is not perfect the...
by radar_5
Tue Oct 27, 2009 10:33 pm
Forum: Linux
Topic: OSS4 sampling rate
Replies: 11
Views: 23793

Re: OSS4 sampling rate

Interesting!
why are they difficult for the audio system??
by radar_5
Tue Oct 27, 2009 10:02 pm
Forum: Linux
Topic: OSS4 sampling rate
Replies: 11
Views: 23793

Re: OSS4 sampling rate

thanks igor, but what are you trying to tell me :?:
by radar_5
Tue Oct 27, 2009 9:27 pm
Forum: Linux
Topic: OSS4 sampling rate
Replies: 11
Views: 23793

Re: OSS4 sampling rate

cesium wrote:That rate is set by "vmixctl" utility. "sudo vmixctl rate /dev/dsp 44100" should allow you to make the desired change.


wow, much better (at least for a sine wave), thanks!
by radar_5
Tue Oct 27, 2009 4:14 pm
Forum: Linux
Topic: OSS4 sampling rate
Replies: 11
Views: 23793

OSS4 sampling rate

Hi, i was playing with PureData, generating some sine waves. I noticed that the audio quality was much better (no popping and clicking) when PureData output sampling rate was set to 48000 Hz matching the audio device sampling rate (by default PD outputs at 44100 Hz). My question is - I have other au...

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