[hpsdr] sampling

[Jason A. Beens]

This makes sense.  Audiophiles worry about phase distortion.

-----Original Message-----
From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org] On Behalf
Of James Courtier-Dutton
Sent: Sunday, April 22, 2007 4:02 AM
To: Glenn Thomas
Cc: hpsdr at hpsdr.org
Subject: Re: [hpsdr] sampling

***** High Performance Software Defined Radio Discussion List *****

Glenn Thomas wrote:
> 
>> Hopefully someone knows definitively why the 192 kHz rate was chosen,
>> and then speak up on the list.  You have me curious now... I will
have
>> to goo do some research.
> 
> I don't know why 192 KHz. The precise frequency really isn't very 
> important as long as it is above the Nyquist frequency and it is 
> known with some precision by whoever wants to recover the data. Maybe 
> it's because 192 is about 10% faster than 44*4=176?
> 
>> Jason Beens
>> KB0CDN
> 
> 73 de Glenn wb6w
> 

I think the reason for the 192 KHz is that for some reason the filters
(both analog and digital) work better, resulting in less distortion at
the audio frequencies.

James


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