[Elecraft] Noise Reduction

[Ron D'Eau Claire]

I'd really like to hear what the noisy BRIL examples sound with a simple
low-cut circuit. The "noise" is in the very low frequencies which sounds
like it'd clean up nicely by just attenuating the bass response (which all
good communications receivers do for just that reason.)

I can understand how the sort of noise reduction offered by SANR would
produce less fatigue over time, but frankly I find the audio more
intelligible *before* reduction than it is after in almost all cases. While
some examples remove minor background hiss, the negative effects on the
desired audio is very distracting and impairs intelligibility to me. The
only example where I'd appreciate the noise reduced output was the
Stationary 4-Harmonic Noise. In that case it was easier to hear clearly what
the voice said in spite of the severe distortion introduced by the
processing. 

Ron AC7AC


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of James Sarte (K2QI)
Sent: Tuesday, November 30, 2010 8:11 PM
To: Guy Olinger K2AV
Cc: Elecraft Reflector
Subject: Re: [Elecraft] Noise Reduction

Hi Guy,

I'd have to agree with you there.  I think the algorithm used by the BHI
device sounds much better than the BRIL offering.

73,
James K2QI

On Tue, Nov 30, 2010 at 9:13 PM, Guy Olinger K2AV
<olinger at bellsouth.net>wrote:

> Well, I listened to the demo's and to MY ears, it seemed ineffective,
> removing the voice entirely at some points.  The "cleaned" output was
> harsh and very treble, and seemed little more than a high pass filter.
>  IMHO, this one is clearly inferior to the K3.  If it was one of the
> choices, it would be complained about a lot, though as completely
> subjective as people are on this topic, some would probably like it.
>
> 73, Guy.
>
> On Tue, Nov 30, 2010 at 2:59 PM, JAMES ROGERS <w4atk at bellsouth.net> wrote:
> > Personally I am quite happy with the solutions offered with the K3. I
> > had no problem finding the "sweet spot" for my noise environment. But
> > for those that wish more, take a look at this site. For a licensing
> > fee you can have BRIL .......
> >
> > "BRIL is a new proprietary algorithm has been recently developed for
> > adaptively estimating and removing background noise from speech
> > signals. Unlike noise reduction and speech enhancement algorithms
> > currently available on the market, the new algorithm is capable of
> > cleaning noisy speech even in severe noisy environments without any
> > distortion to the speech signal. The algorithm has been successfully
> > used in many communication systems with high level of noise. BRIL is
> > suitable for many applications such as car kits, mobile telephony,
> > conferencing, speech recognition, Internet phones, etc."
> >
> > They offer a demo where it seems you can play with setting various
> > parameters.
> >
> > http://www.dspalgorithms.com/products/nr.html
> >
> >
> > JIM ROGERS
> > w4atk at bellsouth.net
> > http://web.me.com/jimrogers_w4atk