[Lowfer] Re: Soundcard question and...

[Peter Barick]

>>> Rick Kunath <k9ao at charter.net> 12/23/07 1:06 PM >>>
>>
No mention of sampling rates supported for playback, likely not any 
under 44.1 KHz.
...
Many audio DSP radio related applications expect the sound card to 
support sampling rates as low as 5512 Hz, 8000 Hz, 11,025 Hz, and 22,050

Hz, in addition to 44.1 KHz and 48 Khz.
...
One of the most important things to look at is supported sample rates on

a card you want to use for audio DSP purposes. This one isn't the best 
choice because of it's limited set of natively supported sampling rates.
<<  -------------------------------------------------

Okay, Rick, others,
Here's specs on a VXpocket Card. Are these among those you suggest for a
suitable card? (We getting some closure here? )

• The VXpocket is full duplex, offering simultaneous and independent
record and playback capabilities.
• Sampling rates supported are 8, 11.025, 16, 22.05, 24, 32, 44.1, and
48 kHz.
• PCM encoding/decoding rates are 8, 16, or 24 bits.
• The VXpocket can run applications that comply with Microsoft's WAVE
protocol.
• Digigram's Sound Manager driver for Mac OS 8.x makes the flexibility
and features of these cards available to Apple Macintosh PowerBook
users.
• An ASIO driver is also available.
• When supported by the user application, analog inputs and outputs may
be configured as one stereo or two mono channels.
---------------------------------------------

Let's all realize the compromise inherent using an outboard card such as
this for sound processing. 1) It's not performing at PCI bus speed, as a
PC card would or one of the on-board types in a laptop. 2) The owner may
not have another choice and attempts to make the best of what he owns.
3) Just how 'pure' must these sampling rates be for Ham signal work?
-----------------------

>> In addition to fully supported sampling rates, on-board clock
stability is important to an audio card.
>> Rick Kunath

But is that among commonly published data or determined empirically by
died-in-the-wool users?
Also beware that this particular card IS a big ticket item, IMO. So is
going this route, OutBoard Card, actually going Over Board !  ;=)
Peter