I remember reading a paper from NASA about understandability and
frequency when I was in college (Many Moons ago).
I think the numbers I state are the same as in the paper but could be
off but the general idea is the same.
It was found that the understandability of the average male voice was
not decreased when frequencies above 3000Hz and below 300Hz were
filtered out but for the "average woman" it was 400Hz and 4500Hz
respectively. The Author of the paper suggested a switchable voice
filter that could be set for male or female
Operators/CapComs/Astronauts. I sometimes wonder if men tending to lose
hearing on the higher end first isn't a survival tactic ;)
This wasn't an issue until the Shuttle for the US and if I recall it was
suggested that the Soviets had been using either a switchable filter or
a wider one since the early days of human space flight.
Tim Hills
Sioux Falls, SD
On 4/23/2014 11:02 AM, Russ Edmunds wrote:
I'm puzzled as to why 3 kHz isn't good enough. I can't say that I've heard any
TIS stations which
were functioning properly which were difficult to hear. I'd guess this might be
an economic issue
relating to the added costs of filtering, in which case a change to 5 kHz won't
change anything.
Russ Edmunds
15 mi NNW of Philadelphia
Grid FN20id
<[email protected]>
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