Acoustic insulator for a telephone handset microphone

Details Acoustic insulator for a telephone handset microphone Acoustic insulator for a telephone handset microphone

1990-01-18

1991-08-20

Ng, Jin F.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

381168, 381169, 379428, 379433, H04R 2500, H04M 100

Patent

active

050420712

ABSTRACT:
An apparatus to isolate a microphone from the speaker audio of a telephone handset, preventing feedback howl. The acoustic insulator consists of a single piece of pliable material that has a smaller diameter element (104) that extends through the handset housing. A hollow passage (102) extends the length of the insulator. The microphone (101) is inserted into the insulator in the larger diameter element (103). The insulator is held in the housing by overlapping ridges (105) encircling the outside of the larger element (103).

REFERENCES:
patent: 4516428 (1985-05-01), Konomi
patent: 4773091 (1988-09-01), Busche et al.
patent: 4870688 (1989-09-01), Vorobu et al.
patent: 4937877 (1990-06-01), Pocock et al.
patent: 4984268 (1991-01-01), Brown et al.
Motorola Incorporated "DYNA T.A.C. Cellular Mobile Telephone", 8/31/83 Mechanical Parts (Control Unit).

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