[TenTec] not quite OT: outboard DSPs

[AL7CR]

I have used both extensively on SSB and the NIR-12 is by far the better 
unit.  It offers the choice of spectral subtraction, adaptive 
filtering, or both in series.  There simply is no comparison between 
the effectiveness of spectral subtraction with adaptive filtering for 
noise reduction.  It requires much more processing power to implement 
which is why it is not seen as often in amateur units.  It does 
introduce a small time delay into the signal but I personally never 
found this a difficulty.  The NIR-12's implementation of adaptive 
filtering is the equal of the DSP59.

The NIR-12 was quite expensive when new.  Also the manufacturer decided 
to focus on government applications as I recall.  I sold my DSP-59 
after using the NIR-12 for only a short time.

The NIR-12 does not have the "bells and whistles" of the Timewave 
unit.  It is a noise reduction unit alone not a multifunction unit.

Dean
AL7CR

On Thu, 15 Jan 2009 19:55:53 -0500, Michael Tortorella wrote:
> Good evening, all:
> 
> Some of using older Tentec equipment can benefit from outboard DSP audio
> filtering, so this is not quite OT..I wonder if I can tap the list wisdom
> regarding a preference for the JPS NIR-12 versus the JPS NIR-10 versus the
> Timewave DSP 59?
> 
> Thanks for any input and 73 to all,
> 
> Mike W2IY
> 
>  
> 
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