Telephonic communications – Terminal – Housing or housing component
Patent
1996-11-07
1999-10-05
Chiang, Jack
Telephonic communications
Terminal
Housing or housing component
H04M 100
Patent
active
059636408
ABSTRACT:
A radiotelephone having a wave guide for channeling sound energy from a speaker to the ear of a person utilizing the radiotelephone. The wave guide is disposed adjacent the speaker and acts to direct sound energy from the speaker to the vicinity of a person's ear. The wave guide comprises an elongated wall structure having inlet and outlet end portions and a varying cross-sectional area that varies in a uniform and repeating manner between maximum and minimum values. This elongated wave guide with its varying cross-sectional areas forms an acoustical low-pass filter that efficiently transmits and propagates low frequencies, that is frequencies in the range of 300 Hz to 3,000 Hz.
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Patent Abstracts of Japan, vol. 095, No. 006, Jul. 31, 1995.
Hanna, R.C. et al, "The Function and Design of Horns for Loudspeakers", Trans. AIEE, vol. 44 (Feb. 1924): 393-404.
Chiang Jack
Ericsson Inc.
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