I gave a talk at CSVHF some years ago on Stochastic Resonance. Strictly
prepared from reading about something I found interesting and not from any
real experience or knowledge of the subject formally. At the same time,
in Vienna happened to meet someone working on speech compression, etc. on
the
Dave, in a left-handed way I just confirmed your observations. With the
DSP buffer set to 2048, filters are very sharp and straight, 25 Hz
setting only hears a small slice of one signal. With the DSP buffer set
to 256, filter no longer has any real effect. I then hear artifacts (on
CW) over 750
Thanks Dale, Bob and Lee for your thoughts. I will be looking forward to
separate DSP for transmit and receive.
Dale, as I said in my original post, I use 2.4K filter but have tried many
other filter widths. Yes, I have tried shifting the filter up/down with no
discernible difference.
Lee, I h
I wonder if this has to do with the nature of whatever external audio
amp/speaker or headphones you are using? You (as in your brain) can process
signals below the noise often by several dB so I wonder if its related in some
way to the interface between the radio and your ear and how 256 buffe
(trying this again; an earlier post was refused by the list)
Hello Dave,
I'm curious what actual filter width were you using, and did you try
shifting the filter up/down to achieve maximum intelligibility (while
the skirt slope was at it's steepest)? I've found that shifting the
filter to fin
Dave:
I have talked to others who hear better when there is a little white
noise outside of the desired range but my tests are conclusive.
At 160 through 6 meters, the minimum discernible signal is within .2 dB
of a fixed number at 256 point buffers through 4096 buffers.
Irrespective of this,
This is an extremely interesting observation and does merit further
study. In theory, there should be no more insertion loss at the longer
buffer lengths. I will run some tests and help figure this out.
Bob
Dave & Nancy Ridge wrote:
> I work weak signal 6 meters on both SSB and CW. I have fo
26, 2007 2:06 PM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] Lower DSP Buffer for SSB Receiving Weak Sigs
I work weak signal 6 meters on both SSB and CW. I have found that I can
copy weak signals on SSB better with the DSP buffer set at 256. I do
know that I cannot transmit using this D
I work weak signal 6 meters on both SSB and CW. I have found that I can copy
weak signals on SSB better with the DSP buffer set at 256. I do know that I
cannot transmit using this DSP buffer (256) without distortion. (Skirt slope is
too broad) I have listened to myself on an SDR remote base 20 m
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