Radiotelephone having a non-resonant wave guide acoustically coupled to a microphone
AssigneeEricsson Inc.
InventorKarl W. Rabe
Life of this patent
Estimating the term…
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.
Claims25
A radiotelephone having an acoustical wave guide for channeling and directing sound energy into a microphone forming a part of the radiotelephone, comprising:
- a radiotelephone having a microphone;
- an elongated wave guide disposed adjacent the microphone for directing sound energy from the mouth of a user to the microphone;
- the wave guide including inlet and outlet portions with the outlet portion disposed adjacent the microphone such that sound energy being directed through the wave guide is directed out the outlet portion thereof into a microphone;
- and wherein the wave guide includes an elongated wall structure having a cross-sectional area that varies in a repeating fashion between large and small cross-sectional areas along a reference axis.
A radiotelephone having a wave guide for directing and channeling sound energy into a microphone associated with the channeling sound energy into a microphone associated radiotelephone, comprising:
- a) a main body;
- b) a flip movably mounted to the main body;
- c) a microphone;
- d) an elongated wave guide disposed in the flip and acoustically coupled to the microphone for directing sound energy from the mouth a user to the microphone;
- and
- e) the wave guide having a variable cross-sectional area along a reference axis that repeatedly varies between maximum and minimum values along the reference axis.
Dependencies are inferred from the claim text.