You need to qualify LMS with for FIR adaptive filters, as least mean
square (least squares) has a much longer history in statistics.
If I understand it, it is the simple algorithm used in (early) modem
equalisation filters, because it is cheap to compute. The problem with
it in the context
In the context of the LMS filter for FIR notch filtering and noise
cancellation, one common way to find the reference is by a simple delay of
the input signal. If the purpose is to separate voice from a sinusoid, then
one utilizes the fact that a sinusoid has a long correlation function in
time
Whilst summing the inverted NR output doesn't sound logically any
different from applying a custom filter, the tactic used by hearing aids
(at least Oticon ones) is actually to determine the frequency and phase
of the presumed interfering signal (howl round in that case) and add in
an inverted
I have severe traumatic hearing loss from one night many years ago when
I still thought I was bulletproof and immortal and I'm pretty deaf above
about 1200 Hz. The Dept of Veterans' Affairs gives me hearing aids,
replacing them every 5 or so years [Thank you US Taxpayers, you change
my
A few years ago I uploaded sound files to the Elecraft/Yahoo news groups.
You can find them in the files section and they show a comparison of audio
with no notch and with it on.
If your interested in some technical stuff, there's a very good tutorial
about the LMS algorithm on the National
It's been 2 years since there were complaints on this forum about the K3
auto-notch. Apparently it was never fixed.
The other day I was working a Ham in Tel Aviv when a carrier came on and
covered his signal. The Auto notch worked well but the guys voice was very
distorted. To me that's
I completely agree - the K3 is very lacking with their auto-notch. It
requires fiddling with the AGC menus to force it to function without
ruining the fidelity of a SSB signal. The NR system is very complex with
many settings - none of which I have found to be very helpful -
certainly no
I agree with the majority of your assessment. I also brought up the Auto
notch issue several years ago and haven't seen much, if any improvement.
As a result, I nearly always just use manual notch. I also have the same
complaint with the way the NR in the K3 works. The KX3 implementation is
Hello,
I find I must also agree with the complaints regarding notching... I
just cam from a Icom 756 P3, and the notching was far superior to the
K3.
--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
for MixW support see;
is still a
good contesting machine at desktop size, hence I still keep my K3.
73
Johnny VR2XMC
寄件人︰ David Cole d...@nk7z.net
收件人︰ elecraft@mailman.qth.net
傳送日期︰ 2014年08月1日 (週五) 6:12 AM
主題︰ Re: [Elecraft] Auto Notch Revisited.
Hello,
I find I must also
is
still a good contesting machine at desktop size, hence I still keep my K3.
73
Johnny VR2XMC
寄件人︰ David Cole d...@nk7z.net
收件人︰ elecraft@mailman.qth.net
傳送日期︰ 2014年08月1日 (週五) 6:12 AM
主題︰ Re: [Elecraft] Auto Notch Revisited.
Hello,
I find I must also
I rarely use the manual notch on CW, I've had other rigs with notch
filters, and I rarely used them either ... it seems that the filter in
my head is enough.
I'm not on SSB very much [compromised hearing, not mode-aversion], and
I've occasionally used the auto-notch on SSB when in
The trouble with the K3 notch is that it is outside the agc loop(audio notch)
unlike the Icom radio. It may notch out the tone but not the carrier. A huge
signal will still swamp the receiver. You will get arguments that this is
better on receiver imd performance but I think I could live with
The Icom’s manual notch is inside the AGC loop, but not the auto notch.
The early (Version 1) Orion firmware had the auto notch inside the AGC loop,
and it was one of the many great features of that radio. In AM mode, you could
punch in audo-notch and it would remove the carrier to let just
A feature that we added to the Hamblaster was something I called a Filter
Freeze button. It was something I suggested and turned out to be very
affective.
It wasn't really physical a button. It was actually an on screen control
that passed a parameter to the Hamblaster telling the LMS algorithm
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