[alsa-devel] arecord | aplay expected delay
Hi,
I'm running arecord and aplay under uCLinux on a Blackfin DSP.
In this way I loopback my audio.
Does anyone know what delay I can expect between audio input and audio output?
I measure at my test board 50ms. I want to have about 1ms!
E-J
On 16-03-08 11:05, van der Linden wrote:
I'm running arecord and aplay under uCLinux on a Blackfin DSP.
In this way I loopback my audio.
Does anyone know what delay I can expect between audio input and audio output?
Not me, but you just want to loop without doing anything to it? An analogue input? Every card I know can just loop it's own inputs out again. That is, In -> Out, while you have In -> ADC -> bus -> cpu/memory -> bus -> DAC -> Out.
I measure at my test board 50ms. I want to have about 1ms!
You'd need a pretty fast system I suppose. Why does your card not loop directly itself? You can still record it as well...
Rene
The purpose is to connect a headset and to provide side-tone from the microphone to the headset.
The idea is to first create a short "software" loop and then to add filter algorithms. With these algorithms I like to experiment.
However the side-tone delay must be short. Before I start making real audio filter algorithms, I want to know the bear minimum delay.
What can be expected using the Linux OS?
----- Original Message ----- From: "Rene Herman" rene.herman@keyaccess.nl To: "van der Linden" ejvanderlinden@hetnet.nl Cc: alsa-devel@alsa-project.org Sent: Sunday, March 16, 2008 10:36 PM Subject: Re: [alsa-devel] arecord | aplay expected delay
On 16-03-08 11:05, van der Linden wrote:
I'm running arecord and aplay under uCLinux on a Blackfin DSP.
In this way I loopback my audio.
Does anyone know what delay I can expect between audio input and audio output?
Not me, but you just want to loop without doing anything to it? An analogue input? Every card I know can just loop it's own inputs out again. That is, In -> Out, while you have In -> ADC -> bus -> cpu/memory -> bus -> DAC -> Out.
I measure at my test board 50ms. I want to have about 1ms!
You'd need a pretty fast system I suppose. Why does your card not loop directly itself? You can still record it as well...
Rene
participants (2)
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Rene Herman -
van der Linden