[TenTec] Panoramic stereo receive

[Paul Christensen]

The creation of this effect is nothing new in the pro-audio world, but it is nice to see the concepts applied to communications.

Back in the mid '70s, Orban/Parasound created the model 245 processor which took a mono signal and comb-filtered the audio in
distinct bands and as I recall, placed two bands into the left audio channel and three bands into the right channel.

Several broadcasters experimented with phase scrambling the left/right audio on each channel, then inserting the result at reduced
amplitude into the respective cross channel.

For some time now, many hams have been inverting the phase of one headphone driver in order to create an out-of-phase effect which
supposedly allows the ear to extract signals at low level that would otherwise be unattainable.

Last year, AOR introduced a similar device to what will be offered in the Orion.  It does this trick, plus offers several other
functions.

I tend to prefer true binaural receive audio like that offered with the RX-340/Pegasus/N4PY combination or the Yaesu FT-1000 series
transceivers.  By controlling the frequency on one receiver in 1 Hz increments, you can dramatically change the effect of the
perceived phase rotation.  Slight changes of 1 Hz or so in either direction can have a profound effect on extracting weak signals.

-Paul, W9AC

----- Original Message -----
From: "Mark Erbaugh" <mark@microenh.com>
To: <tentec@contesting.com>
Sent: Wednesday, May 15, 2002 10:34 PM
Subject: Re: [TenTec] Panoramic stereo receive


> The latest firmware update to the Timewave DSP599zx external DSP box offers
> something similar. Once you select a center frequency, higher tones move to
> one side and lower tones to the other.  Unfortunately the center frequency
> in only selectable as 500 and 750. It would have been nicer if the
> selections were say every 50 Hz so I could select 600 or 700.
>
> While the demo clearly demonstates the movement from right to left as the
> tone pitch changes, I would like to hear a demo with multiple tones
> simultaneously.  I think that would more accurately show how this feature
> would help reception.
>
> 73,
> Mark
>
> ----- Original Message -----
> From: "Ten-Tec Inc. Amateur Radio Sales" <sales@tentec.com>
> To: <tentec@contesting.com>
> Sent: Wednesday, May 15, 2002 17:17 PM
> Subject: [TenTec] Panoramic stereo receive
>
>
> > For an example of how Panoramic Stereo Receive on the Orion will
> > work, have a look at www.tentec.com/panoramic.htm
> >
> > The .ZIP file includes an article by Doug Smith, KF6DX, and a 29
> > second .WAV file with a demo of the technique.
> >
> > Panoramic stereo is designed for use with headphones, but you can
> > still appreciate the effect with loudspeakers.
> >
> > Scott Robbins, W4PA
> >
> >
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