Re: [TenTec] TenTec Digest, Vol 116, Issue 10

[Marty Hartwell <mhartwe@gmail.com>]

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@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@ameritech.net>
> Subject: Re: [TenTec] ORION 1 vs ORION2
> To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
> Message-ID: <50255A1F.6090600@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
> ***************************************