[Lowfer] WOLF!

[John Andrews]

Bill,

Lord knows, simple division is the last thing that the sound card people 
think of! Rate conversions are done by black magic...

John a.

On 1/1/2016 7:24 PM, Bill de Carle wrote:
> At 06:32 PM 1/1/2016, John, W1TAG wrote:
>> Bill,
>>
>> Thanks for the report. Not sure what sampling rate you were using with
>> the netbook -- perhaps it doesn't support 8000 Hz. Maybe try 11025? I
>> don't think that the WOLF GUI was designed to go above that.
>
> Well, guess one is never too old to learn something new, eh?
>
> I was using 8000 samples per second.  I have three of those SYBA dongles
> (they use the VIA ENVY VT1620A sound chip and are excellent in all other
> respects).  All of them are *extremely* close to the nominal sample rate
> at 48000, 24000, 12000 (e.g. WSPR works perfectly without any
> correction).  I naively assumed 8000 would be bang on as well.  But then
> I injected a known audio tone at 8000 s/s rate and measured the apparent
> frequency and whaddya know, the *actual* sample rate was 7800.00223 s/s
> !!!  I was flabbergasted.  Typed in that sample rate and WOLF now
> decodes correctly.
>
> Dunno if it's the VT1620A chip or the Microsoft driver.  You'd think it
> would be easy to divide 48000 by 6 to get 8000.
> 73,
> Bill VE2IQ
>
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