"David J Windisch" wrote in message
...
Hi, all concerned:

Ponderings while listening to a dead 40M c-w frequency ...

What artifacts does latency in a DSP implementation cause?

I'm thinking of eg a "DSP rcvr" OOH and an "analog receiver" OTOH, both
tuned to WWV, and the noticeable delay of the DSP audio from the analog
audio. You know, ti-tick ti-tick instead of tick-tick-tick, and "blurred"
voice announcements.

I've noticed a similar effect in add-on DSP by putting speakers at the
input and at the output of the add-on device. Stereo cans make the
effect downright strange.

Fast c-w QSK would seem to be a challenge, especially if latency varies
with selectivity.

Makes me wonder how the commercial "DSP rigs" perform. I'm mostly
satisfied with an Elecraft K2 (wish it had 200W barefoot, instead of
100W), and have fond memories of my TS-850's. Never met a commercial
radio I couldn't make better ;o)

Delay is inherent in most DSP systems used for filtering, because they
generally use a circular buffer for the convolution operation. It acts like
a delay line.

73, Leon