[TenTec] TenTec Digest, Vol 116, Issue 10

[Duane Calvin]

And yet another reason is that the motherboard sound cards are not optimized
for DSP work that ham radio applications would like to make of them.   If
you followed the Flex radio saga over the years, you know that they very
quickly went from requiring the most advanced add-in sound card in your
computer to either providing the computer or building it in to their radios.
Also, companies like microHam, build their devices with their own
"soundcard" in the device because it can be designed specifically to be
optimized for the application.  The end result has been a win/win for ham
radio.  

	73, Duane

Duane Calvin, AC5AA
Austin, Texas
www.ac5aa.com  

 

-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of Marty Hartwell
Sent: Friday, August 10, 2012 3:05 PM
To: tentec at contesting.com
Subject: Re: [TenTec] TenTec Digest, Vol 116, Issue 10

Another good reason is to dedicate the external sound card,
so as to keep computer sounds from being sent over the air.
Internal for windows/computer sounds, external for digital
signals to be transmitted.

Marty kd8bj

On 08/10/2012 02:00 PM, tentec-request at contesting.com wrote:
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>     1. Re: ORION 1 vs ORION2 (Richards)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 10 Aug 2012 14:59:43 -0400
> From: Richards <jruing at ameritech.net>
> Subject: Re: [TenTec] ORION 1 vs ORION2
> To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
> Message-ID: <50255A1F.6090600 at ameritech.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I will hazard a WAG about the use of external sound cards.
>
> In the speech recognition world, it was discovered that some internal
> sound cards, especially those built onto the motherboard, were poorly
> implemented and were subject to EMI/RFI interference, adding noise to
> the analog signal ahead of the DAC - so we went to external sound cards
> (in that venue they are affectionately known as "USB sound pods" - which
> did the DAC closer to the microphone, and external to the electrically
> noisy internal computer case - this was especially the case with laptop
> computers - and in most cases, the problem could have been solved with
> five cents worth of shielding.
>
> So, I am thinking you are externalizing the DAC  (Digital to Analog
> Conversion) to avoid EMI/RFI issues.
>
> Any traction?   Do I win the cigar ?
>
> My next guess would involve native driver issues...   ;-)
>
> ====================  James -K8JHR  ==================
>
> On 8/10/2012 7:43 AM, Rick Dougherty NQ4I wrote:
>
> , a computer with
>> USB sound card external interface(anybody know why), H
>
> ===================================================
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> End of TenTec Digest, Vol 116, Issue 10
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