Sat Jan 28, 2006, 12:17pm
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Official Forum Member
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Join Date: Dec 2004
Posts: 508
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Quote:
Originally posted by Camron Rust
Quote:
Originally posted by assignmentmaker
Quote:
Originally posted by Drizzle
Fox 40s are pealess but are very loud -- however because of its design there is no detectable vibration. Although it's faint, a vibration emits from a pea whistle, which deaf kids are much more likely to pick up.
I am just speculating though, correct me if I'm wrong.
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I would think that pea-whistles make more 'noise' in the process of creating sound - the pea whacking up against its confining chamber; and such noise probably has low frequency components that the Fox 40 lacks. Are deafnesses equal across frequencies?
Fletcher and Munson found that - differently for different frequencies - lower pitched sounds had to be a lot more energetic to create the same perceived loudness as higher pitched ones. This would seem to argue against the pea-whistle getting through better to deaf players.
What is the actual experience of near deaf players???
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You apparently have heard of Fletcher and Munson but there is more to it than you mention.... the same is true for high frequencies as it is for low. The ear is most sensitive to sounds around the frequencies of the human voice (imagine that). As the frequency goes higher OR lower from that point, it takes an increasing amount of sound pressure to be perceived as the same loudness. The amount of difference depends on the specific sound pressure level and decreases as the volume is increased. That is the principle behind the "Loud" button you some audio equipment.
The fox 40 has a very high pitch. The pea would created vibrations closer to the most sensitive human hearing range. For partially deaf people, the loss is often at the frequency extremes (it's probably different in each individual)...so bringing the whistle frequency more to the middle could help. I have a coworker who is essentially completely deaf. However, there are a few very low frequency sounds that she can hear...if they're loud.
[Edited by Camron Rust on Jan 28th, 2006 at 04:08 AM]
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Apparently.
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