Good information on the Symmetra-Peak and phase rotation/scrambling
can be found here: http://www.w3am.com/8poleapf.html and a discussion
of AM symmetry with info on the "all pass filter" (phase rotation)
here: http://www.tonnesoftware.com/appnotes/allpass/allpass.html.
I suspect the rotation would take very few resources to accomplish
in DSP and could be easily accommodated in the TX EQ and/or audio (level
control) portion of the ALC circuits.
73,
... Joe, W4TV
On 10/6/2010 6:04 AM, Paul Christensen wrote:
> For each voice, polarity only needs to be set once for each mic source. For
> crystal, ceramic, and dynamic mics, that can usually be accomplished by
> inverting the polarity at the mic element. Most folks who take AM polarity
> seriously are also using some other intermediate audio processing device
> with balanced input/output terminations. In that case, inverting polarity
> is as easy as flipping conductors on one balanced audio pair. For tiny
> electret mics without any additional processing, the problem becomes a bit
> more complex to resolve but then, I don't know of many folks using electrets
> on AM.
>
> If a phase scrambler were part of the K3's DSP, any thought as to how much
> DSP resource utilization is required?
>
> Paul, W9AC.
>
>
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