GM> PM> I have also heard this in respect to radio comms. My experience backs
GM> PM> it up, a deep baritone voice wont get as far a high pitched voice!

GM>Telephone earpieces used to have a peak in their response between
GM>1000 and 2000 Hz for greater intelligibility

GM>A friend of mine did an experiment on his amateur transmitter by
GM>adding a second order high pass at 1KHz to the mic line. This cut
GM>out a lot of the stronger parts of the signal and when he wound
GM>the modulation back up to peak at 100%, the parties on the
GM>receiving end said that the readability of his signal was
GM>improved and also much, MUCH louder. Strangely they didn't notice
GM>the loss of the LF band, probably because most of them were
GM>listening on small loudspeakers 

GM>It shows that most of the power in the voice signal is below 1000
GM>Hz, and most of the inteligibility is above 1000 Hz. Female
GM>voices, being in general less powerful than males in the range
GM>below 1000 Hz, can be amplified to higher levels before the gear
GM>overloads and so are more easily heard.

Since the information part of most female voices is above
the 1000 Hz, this would explain why their voices are so much
more understandable - both by ear  and in voice recognition
programs.

JAY

GM>It also explains why "whoofy" PA systems are so hard to
GM>understand, even when they are wound up to bl**dy annoying
GM>levels!

GM>From Greg Mayman, in beautiful Adelaide, South Australia

GM>... I met my wife & time stood still. She had a face that broke the clock!
GM>___ Blue Wave/386 v2.30

GM>--- FLAME v2.0/b
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