[Discuss-gnuradio] Problem with 192KHz sampling rate on alsa source

[Marcus D. Leech]

I'm running Fedora 14, with the latest Gnu Radio code.

I have an M-Audio Revolution 7.1 sound card, which can sample up to 192KHz.

I have a flow-graph that sets the card up for 192KHz sampling, and I've 
confirmed that the hardware apparently thinks it's sampling
  at 192KHz, but when I display the FFT of the resulting sample stream, 
the spectrum is "mirrored" about 48KHz, almost as if something,
  somewhere, is running at the wrong sample rate, but I can't figure 
out *where* that might be.

Do I have to do anything special to pulseaudio configuration to get 
support for the 192KHz rate?  This particular card uses the Envy24HT
  (ICE1724) chipset:

Here's the hw_params file from /proc/asound  for the card in question:

access: RW_INTERLEAVED
format: S32_LE
subformat: STD
channels: 2
rate: 192000 (192000/1)
period_size: 1920
buffer_size: 7680


This is a 24-bit card, which means that the driver is using S32_LE -- 
does that confuse Gnu Radio Alsa source?  Is it expecting 16-bit samples,
  and mis-interpreting the 32-bit samples it's getting?




--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org