[hpsdr] DttSP (was Blackfin)

[Philip Covington]

On 7/12/07, Frank Brickle <brickle at pobox.com> wrote:
> Philip Covington wrote:
>
> > Is there provision for lowering the demodulated audio output
> > rate from DttSP to something like 8 or 16 kHz?
>
> I'm still a little confused about the scenario you're describing,
> but here's a partial response if not an answer. Audio format
> conversion is something we intended to fob off on either an
> external client or on an ALSA plugin. I think all of the
> individual cases you mention can be handled off-the-shelf by ALSA
> plugins. That includes using open file descriptors as sources or
> sinks, shared memory segments, resampling, and compression.
>
> What I *suspect* is that there is an ALSA slave pcm device that
> can be constructed in .asoundrc that will do what you want.
> Without a clearer understanding of the configuration, however,
> that's just a conjecture.
>
> The slave PCM devices, especially as sugmented by dmix and dsnoop,
> are pretty powerful.
>
> 73
> Frank
> AB2KT
>

Hi Frank,

Yep, I think it points me in the right direction to go.  I really need
to take a closer look at the ALSA documentation - I've avoided it for
too long.

Thanks.

73 Phil N8VB

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