[PD-dev] Re: [PD] RME hammerfall

[Winfried Ritsch]

>
> i just tested the alsa interface on my hdsp ... basically it works fine
> for large buffer sizes ...
> but there are a few points:
>
> - i can't get below 2902 us of latency with 44.1 kHz / 2666 us with 48
>   kHz ... so basically a period size of 128 ... the hdsp is capable of
>   64
> - using these lowest latencies, i experience glitches:
>   44.1 kHz: every once in a while (about one every 5 seconds)
>   48 kHz: strong glitches for about 500 ms followed by about 3 ms more
>           or less clean sound
>   88.2 kHz: continuous glitches
>   96 kHz: similar to 48 kHz, but scaled by factor 2
>
I think since pd use a internal blocksize of 64 und you need at least two of 
them, you have to reduce the pd blocksize to get latencies below 128 
Buffersize. (see and please correct 
http://puredata.info/Members/ritsch/latency 
http://puredata.info/Members/ritsch/latency/pd_structure  )

mfg winfried