Radiotelephone having a non-resonant wave guide acoustically cou

Details Radiotelephone having a non-resonant wave guide acoustically cou Radiotelephone having a non-resonant wave guide acoustically cou

1996-11-07

1999-03-30

Wolfe, Willis R.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455570, 379433, 381338, 381344, H04R 108, H04M 908

Patent

active

058900721

ABSTRACT:
A radiotelephone having an acoustical wave guide for channeling and directing sound energy into a microphone forming a part of the radiotelephone. The wave guide includes an elongated tube structure that varies in cross-sectional area from an inlet end to an outlet end thereof. More particularly, the wave guide is formed by a wall structure that includes portions that assume a wave configuration. This wave configuration gives rise to the varying cross-sectional area that is repeatedly found between the inlet and outlet end portions of the wave guide. This wave type configuration for the wave guide forms an acoustical low-pass filter that propagates and transmits non-resonant low frequencies in the range of 300 Hz to 3,000 Hz.

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Hanna, R.C. et al, "The Function and Design of Horns for Loudspeakers", Trans. AIEE, vol. 25, No. 9, Sep. 1977, pp. 573-585.

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