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@xxxxxxxxxxxx> To: "van der Linden" <ejvanderlinden@xxxxxxxxx> Cc: <alsa-devel@xxxxxxxxxxxxxxxx> Sent: Sunday, March 16, 2008 10:36 PM Subject: Re: 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 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
