economical bandpass audio filter?

[[email protected]]

seek recommendations. for voice intelligibility enhancement on a
orderwire copper-pair.

professional marine application. sturdiness is more important than
bleeding-edge performance.

 

[Dan Conti]

When are they coming for Cuhulin?

 

[[email protected]]

It might help to describe the application in more detail.

 

[Jasen Betts]

["Followup-To:" header set to sci.electronics.misc.]

seek recommendations. for voice intelligibility enhancement on a
orderwire copper-pair.

ordinary copper wire pair?

check that the devices at each end are operating correctly
and have the correct power supply etc..

maybe you need a better microphone?
possiblly one with background noise rejection.

amplify the signal before putting it into the wire
then the noise will be less significant

bandpass filter 300-3000Hz

encode the audio digitally (probably major overkill)

professional marine application. sturdiness is more important than
bleeding-edge performance.

keep the wires dry and waterproof all junctions...
i'd look at liquid electrical tape unless you have a superior product.

keep them away from power runs or rune them in a separate conduit from
the power

Bye.
Jasen

 

[David]

seek recommendations. for voice intelligibility enhancement on a
orderwire copper-pair.

professional marine application. sturdiness is more important than
bleeding-edge performance.

They make telephone instruments just for order wires.

 

[Jayseebee]

Actually we (retired and Ex ATT,Bell,SBC and now ATT again) used to do a
frequency run test with an audio signal generator and a receive
measuring device at the far end. If needed we would put in a equalizing
unit (Wescom, Teltrend, etc) that we could adjust the 300-to 3khz slope
(sometimes up to 8khz for audio program loops for radio broadcast) with
to make all frequencies as flat as possible or boost the level of the
freqs as needed. You can get even more technical in the time delay at
different frequencies on the same copper path traveling from one end to
the other. Lets see what this stirs up.

JCB

 

[Robert Kubichek]

Digitizing it, then running it on a network would give you the best
voice quality, and the network can be used for other data
( environmental, remote control, alarms, ect) plus it would be relatively
simple to set up..

 

[Michael A. Terrell]

Actually we (retired and Ex ATT,Bell,SBC and now ATT again) used to do a
frequency run test with an audio signal generator and a receive
measuring device at the far end. If needed we would put in a equalizing
unit (Wescom, Teltrend, etc) that we could adjust the 300-to 3khz slope
(sometimes up to 8khz for audio program loops for radio broadcast) with
to make all frequencies as flat as possible or boost the level of the
freqs as needed. You can get even more technical in the time delay at
different frequencies on the same copper path traveling from one end to
the other. Lets see what this stirs up.

JCB

I was a US Army broadcast engineer at Ft Greely, AK back in the early
'70s. Our AFRN network feed came through the "White Alice" microwave
network. By the time it reached our station the level was so low that I
had to use a spare magnetic phono preamp from our old transcription
turntable to bring the feed up to line level. Before that, when they
went from network to live, or back to the network they had to reset the
levels. Repeated requests were made to fix the feed, but we were always
told that the level was ok in Fairbanks, and the problem must be on our
end of the feed because the phones worked.

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Don Bowey]

I was a US Army broadcast engineer at Ft Greely, AK back in the early
'70s. Our AFRN network feed came through the "White Alice" microwave
network. By the time it reached our station the level was so low that I
had to use a spare magnetic phono preamp from our old transcription
turntable to bring the feed up to line level. Before that, when they
went from network to live, or back to the network they had to reset the
levels. Repeated requests were made to fix the feed, but we were always
told that the level was ok in Fairbanks, and the problem must be on our
end of the feed because the phones worked.

As I recall, the telco-techno correct language for that is: "the trouble is
leaving here ok," which is used almost as often as: "trouble came clear
while kicking bay."

Don

 

[David]

seek recommendations. for voice intelligibility enhancement on a
orderwire copper-pair.

professional marine application. sturdiness is more important than
bleeding-edge performance.

http://history.acusd.edu/gen/sespics/362-22.JPEG