Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1994-06-20
1998-10-06
Cumming, William
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455570, 368 13, H04Q 732
Patent
active
058191836
ABSTRACT:
The present invention is directed to apparatus and methods for reducing sidetone feedback in a portable wireless telephone system by positioning the speaker and the microphone to reduce acoustic feedback and by controlling the amplifier gain in the transmitter section of the wireless telephone to reduce amplification of sidetone which has been acoustically coupled from the speaker to the microphone. The wireless telephone may be configured as a watch with a wrist strap for retaining it to the user, as a piece of jewelry such as a brooch or pendant, as a voice capable pager/intercom, or as an identification badge for an employee. In one embodiment, the base station includes circuitry for further reducing sidetone feedback. In additional embodiments, the wireless telephone may include a quick-release outboard battery, a retractable earpiece, and an ergonomic keypad.
REFERENCES:
patent: D210462 (1968-03-01), Roberts
patent: D249508 (1978-09-01), Coughlin et al.
patent: D273307 (1984-04-01), Yamagami
patent: D293097 (1987-12-01), Alligood et al.
patent: D293671 (1988-01-01), Beaumont
patent: D297946 (1988-10-01), Kuo
patent: D309306 (1990-07-01), Weiser et al.
patent: D313243 (1990-12-01), Chimalamarri
patent: D318865 (1991-08-01), Ichikawa
patent: D326450 (1992-05-01), Watanabe
patent: D333560 (1993-03-01), Miyashita et al.
patent: D334043 (1993-03-01), Taniguchi
patent: D340932 (1993-11-01), Yan
patent: D352706 (1994-11-01), Hong
patent: D353379 (1994-12-01), Nakamura et al.
patent: 2478887 (1949-08-01), Nelson
patent: 4646872 (1987-03-01), Kamon et al.
patent: 4658425 (1987-04-01), Julstrom
patent: 4847818 (1989-07-01), Olsen
patent: 4885728 (1989-12-01), Gosselin
patent: 4942617 (1990-07-01), Boylan
patent: 5014294 (1991-05-01), Kromenaker et al.
patent: 5048092 (1991-09-01), Yamagishi et al.
patent: 5099519 (1992-03-01), Guan
patent: 5121426 (1992-06-01), Baumhauer, Jr. et al.
patent: 5191602 (1993-03-01), Regen et al.
patent: 5214623 (1993-05-01), Saeger
patent: 5218577 (1993-06-01), Saeger
patent: 5224076 (1993-06-01), Thorp
patent: 5251189 (1993-10-01), Thorp
patent: 5251329 (1993-10-01), Takagi et al.
patent: 5260915 (1993-11-01), Houlihan
patent: 5274613 (1993-12-01), Saeger
patent: 5301224 (1994-04-01), Major
patent: 5339461 (1994-08-01), Luplow
patent: 5381475 (1995-01-01), Cavallo
patent: 5499292 (1996-03-01), Blonder et al.
Battery pack for Sonab hand transceivers Pu 38 and Pu 45 (Jun. 1975).
Anderson Marlyn J.
Kobylarz Daniel E.
Maser Steven
Voroba Barry
Zochert Carrie L.
Cumming William
Microtalk Technologies
Trost William G.
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