[TenTec] The Audio Bug

Thu Apr 6 18:32:03 EDT 2006

The analog audio part is not the problem...it's the DSP.

Ron Castro
Chief Technical Officer
Results Radio, LLC

----- Original Message ----- 
From: "Brad Bradford" <y2kbrad at hotmail.com>
To: <tentec at contesting.com>
Sent: Thursday, April 06, 2006 2:28 PM
Subject: Re: [TenTec] The Audio Bug

>I have a "DUMB" idea!!  Has anyone considered discussing the audio issues
> with the Audio Design Engineer at Ten Tec?  Is this idea to "DUMB" to
> mention or is the point is to have a topic that folks can hash, until it
> turns into mush, like the O2 audio?????????  Just asking!!
>
> Ten-Tec, Inc., 1185 Dolly Parton Pkwy, Sevierville, TN 37862 USA
> Contact Mon-Fri Eastern: Office/Tech (865) 453-7172 9 am-5 pm.
> Repair (865) 428-0364 8-4.  Sales (800) 833-7373 9 am-5:30 pm.
>
> <html><DIV><FONT color=#009966>With appreciation(!!) </FONT></DIV>
> <DIV><FONT color=#009966></FONT></DIV><FONT color=#009966>Very truly 
> yours,
> </FONT>
> <DIV></DIV>
> <DIV><FONT color=#009966></FONT></DIV><FONT color=#009966><IMG height=12
> src="http://graphics.hotmail.com/emsmile.gif" width=12>Brad Bradford<IMG
> height=12 src="http://graphics.hotmail.com/emsmile.gif"
> width=12></FONT></html>
>
>
>
>
>>From: Mike Gorniak <mgorniak at genesiswireless.us>
>>Reply-To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
>>To: tentec at contesting.com
>>Subject: Re: [TenTec] The Bug
>>Date: Thu, 06 Apr 2006 09:01:47 -0500
>>
>>Martin,
>>
>>The most telling difference between V1 and V2 software, with respect to
>>transmit audio quality, can be observed using an  external  receiver and
>>an Audio Editing program such as Cool Edit or Adobe Audition.. Viewing
>>the recovered waveform of normal speech on V2 reveals a distinctively
>>clipped waveform that is very different from  V1.
>>
>>No amount of input level manipulation or gain adjustment on the Orion
>>can make it go away, which seems to indicate that this is happening
>>someplace after the first audio amplification stage. Quantifying this as
>>a "measurement" of some kind is a bit tricky, but I can assure you that
>>the results are quite audible. For all of science's sophistication with
>>measurement techniques, nothing accurately quantifies the audible
>>effects of clipping. What IS known is that optimal interstage audio gain
>>structure can completely eliminate it. As a general rule, an audio
>>circuit  will typically allow at least 10db of headroom between the
>>nominal operating level and the clipping point. That number can vary
>>considerably, depending on what the intended function of the circuit is
>>and whether or not the dynamic range of the input audio has been
>>modified prior to application.
>>
>>My guess is that we have an audio stage being run too close to it's
>>clipping point. This audio stage is controlled in software, and is not
>>user adjustable. The increase of sensitivity with respect to levels on
>>both the microphone and auxiliary inputs seem to support this theory.
>>
>>73,
>>
>>Mike
>>NM7X
>> > -----Original Message-----
>> > From: tentec-bounces at contesting.com
>> > [mailto:tentec-bounces at contesting.com]On Behalf Of Martin, AA6E
>> > Sent: Wednesday, April 05, 2006 9:03 AM
>> > To: Discussion of Ten-Tec Equipment
>> > Subject: Re: [TenTec] The Bug
>> >
>> >
>> > I don't have an opinion about O2 sound vs O1 (V1) or O1 (V2), but I
>>would
>> > like to see measurements instead of comments like "not robust".  I
>>haven't
>> > got a clue what robust sound is!
>> >
>> > 73 Martin AA6E
>> >
>> > On 4/5/06, Toby Pennington <toby423 at earthlink.net> wrote:
>> >
>> >> I haven't heard a really good sounding O2 yet.  OK, Yes,  but not like
>>the
>> >> robust audio coming out of the V1 firmware on the Classic Orion. 
>> >> Toby
>> >> W4CAK
>> >>
>> >>
>> >>
>> >
>>_______________________________________________
>>TenTec mailing list
>>TenTec at contesting.com
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>
>
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