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Technology Stocks : ATCO -- Breakthrough in Sound Reproduction
ATCO 15.480.0%Mar 28 5:00 PM EST
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To: Urlman who wrote (344)5/6/1998 10:15:00 AM
From: Lee Barrineau  Read Replies (1) of 2062
 
Urlman,

Don't tell me you actually understand this stuff? Also ATCO's off to a quick start today, could this be the begining of round two?

-Lee Barrineau

FIG. 3. Attenuation of ambient sound with Flent antinoise stopples
(collated from Zwislocki (3) and Von Gierke (4).

|----|---|--|--|-|-|-|||----|---|--|-|||
| | | | | | | ||| | | | |||
|----|---|--|--|-|-|-|||----|---|--|-||| A = FLENTS
| | | | | | | ||| | | | |||
10|----|---|--|--|-|-|-|||----|---|--|-||| B = THEORETICAL LIMIT
| | | | | | | ||| | | | ||| OF ATTENUATION BY
FUNCTION(db) |----|---|--|--|-|-|-|||----|---|--|-||| EAR PROTECTORS
A | | | | | | ||| | | | |||
|----A---|--|--|-|-|-|||----|---|--|-|||
B | A A A | A AAA A| | | |||
|----B---B--|--|-A-|-|||----A---|--|-|||
| | | | B | | ||| | A | | |||
30|----|---|--|--|-|-|-B||----|---A--|-A||
| | | | | | | ||| | | A |A|
|----|---|--|--|-|-|-|||B---|---|--|-||A
| | | | | | | ||| B | | | |||
|----|---|--|--|-|-|-|||----|---|--|-||B
| | | | | | | ||| B | | B||
|----|---|--|--|-|-|-|||----|---|-B|-|||
| | | | | | | ||| | B | | |||
50|----|---|--|--|-|-|-|||----|---|--|-|||
| | | | | | | ||| | | | |||
|----|---|--|--|-|-|-|||----|---|--|-|||
| | | | | | | ||| | | | |||
|----|---|--|--|-|-|-|||----|---|--|-|||
100 1000 10000
FREQUENCY


TABLE 2. Theshold for perception of rf sound (ambient noise level 70-
90 db).
Peak
Avg Peak Peak Magnetic
Power Power Electric Field
Trans- Frequency, Duty Cy. Density, Density Field amp.
mitter mc mw, cm2 mw, cm2 v cm turns, m

A 1,310 .0015 0.4 267 14 4
B 2,982 .0004 2.1 5,250 63 17
C 425 .0038 1.0 263 15 4
D 425 .007 1.9 271 14 4
E 425 .014 3.2 229 13 3
F 425 .028 7.1 254 14 4
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