Do you recognize this sound?
 

I have a wave file from a radio reception made four decades ago.

ftp://www.members.aol.com/hdblenner/sound.wav

The sound is familiar to me and wonder how others would characterize
this signal?

I withhold my opinion of the sound to avoid biasing the views of
others.

TIA

Herbert

"Herbert Blenner" wrote in news:1115256419.563770.126120
@f14g2000cwb.googlegroups.com:


I have a wave file from a radio reception made four decades ago.

ftp://www.members.aol.com/hdblenner/sound.wav

The sound is familiar to me and wonder how others would characterize
this signal?

I withhold my opinion of the sound to avoid biasing the views of
others.

TIA

Herbert


Microphone squelch? It's only 1/4 second long.

"Herbert Blenner" wrote in message
oups.com...

I have a wave file from a radio reception made four decades ago.

ftp://www.members.aol.com/hdblenner/sound.wav

The sound is familiar to me and wonder how others would characterize
this signal?

I withhold my opinion of the sound to avoid biasing the views of
others.

Sounds just like white noise in between stations.
--
Simon Mason
http://www.simonmason.karoo.net

The clip is a bit short, but putting it in a loop, you can hear one
tone going on and off. Perhaps this is some sort of OOK
(on-off-keying), or just noise hitting a filter that rings a bit. You
can't do much analysis on such a short clip.

On 4 May 2005 18:26:59 -0700, "Herbert Blenner" wrote:


I have a wave file from a radio reception made four decades ago.

ftp://www.members.aol.com/hdblenner/sound.wav

The sound is familiar to me and wonder how others would characterize
this signal?

I withhold my opinion of the sound to avoid biasing the views of
others.


First, I'm going to assume that there's a problem with the way the
file is encoded - if it's stretched out to 10 seconds (more or less)
then you can start getting a sense of what's going on.

Sounds like some sort of analog, time-multiplexed, instrumentation
signal to me.

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On Thu, 05 May 2005 20:09:51 -0500, funkbastler
wrote:

First, I'm going to assume that there's a problem with the way the
file is encoded - if it's stretched out to 10 seconds (more or less)
then you can start getting a sense of what's going on.

Wow - if you stretch it out to 60 seconds or so, it sounds like
somebody doing some really nasty things to a cello ;-)

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funkbastler wrote:
On 4 May 2005 18:26:59 -0700, "Herbert Blenner"
wrote:


I have a wave file from a radio reception made four decades ago.

ftp://www.members.aol.com/hdblenner/sound.wav

The sound is familiar to me and wonder how others would characterize
this signal?

I withhold my opinion of the sound to avoid biasing the views of
others.


First, I'm going to assume that there's a problem with the way the
file is encoded - if it's stretched out to 10 seconds (more or less)
then you can start getting a sense of what's going on.

A problem with file encoding would not surprised me. I wrote the code
to generate this wave file from a 21 megabyte file. Speech comes out
fine so if errors are present they are minor.


Sounds like some sort of analog, time-multiplexed, instrumentation
signal to me.

I have also observed evidence of time multiplexing. Short term analysis
shows rapid shifts in spectra. By increasing duration of my transform
to hundreds of milliseconds or longer, I find a dominant sinusoid
emerging around 900 Hz.

I interpret these results as showing a simultaneous amplitude and
frequency modulation of audio.


Herbert



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