I've noticed that Cadence's ALSA-JACK bridge introduces bad distortion to the signal.
Here's an example of a track in original shape, and played back through the bridge.
There's also some MP3 compression aftifacts (hihat) audible introduced by Soundcloud streaming, but other problems are far more audible:
I can hear aliasing there.
Also the lowpass-filtered bass part reveals quantization distortion. There's no high frequency content to alias there, so it must be it.
Anybody shares my experience?
Cadence ALSA-JACK bridge: aliasing & quantization distortion
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- unfa
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Re: Cadence ALSA-JACK bridge: aliasing & quantization distor
Thanks a bunch
Yes, a GUI item would be very helpful, I was sure this is a bug.
Yes, a GUI item would be very helpful, I was sure this is a bug.
Re: Cadence ALSA-JACK bridge: aliasing & quantization distor
To be honest i have never noticed this and i use the alsa bridge fairly often to get karaoke tracks into ardour of youtube for doing vocal covers.
I also play stuff of soundcloud however im using a crappy onboard soundcard which may either hide it or im so used to it i dont notice it.
And not using crappy speakers either though they dont do anything about 15khz.
edit:
changed it to 4 dsp load is 25% and get clicks and glitches....
I also play stuff of soundcloud however im using a crappy onboard soundcard which may either hide it or im so used to it i dont notice it.
And not using crappy speakers either though they dont do anything about 15khz.
edit:
changed it to 4 dsp load is 25% and get clicks and glitches....
- unfa
- Established Member
- Posts: 129
- Joined: Tue May 17, 2011 10:43 am
- Location: Warsaw, Poland
- Has thanked: 1 time
- Been thanked: 19 times
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Re: Cadence ALSA-JACK bridge: aliasing & quantization distor
I get the same clicks and glitches, sound like x-runs, but other JACK audio is free of that.
I think it's because the alsa_in/out processes are run with very high nice value, how can I change that to something normal? I'm looking into the code of the script, but can't find anyhting nice-related there.
I think it's because the alsa_in/out processes are run with very high nice value, how can I change that to something normal? I'm looking into the code of the script, but can't find anyhting nice-related there.