Jeff M Wimsatt

US Patent:

49759493, Dec 4, 1990

Filed:

Jun 15, 1989

Appl. No.:

7/366763

Inventors:

Jeff M. Wimsatt - Aptos CA
Frederick P. DeKalb - Ben Lomond CA
Gary L. Sanders - Saratoga CA
Robert J. Bernardi - Scotts Valley CA

Assignee:

Plantronics, Inc. - Santa Cruz CA

International Classification:

H04M 100

US Classification:

379387

Abstract:

An electronic telephone set for use with a telephone headset receiver/transmitter apparatus is disclosed. The telephone set is line-powered, and is capable of transmit muting, last number re-dial, and memory dialing. The volume of the received voice signal is controllable by a user, and a visual indication of the volume setting is provided. The receiver and transmitter amplifiers includes circuitry for compensating for the frequency response characteristics of two or more headsets, the compensation circuitry being selectively and automatically engaged by means of a programmable connecting jack. The design of the telephone is such that it consumes very little power, especially during "on-hook" operation. Moreover, an electrical storage device is employed to provide continuous operational power to the dialer circuitry and electronic hook-switch control circuitry, so that the telephone set retains its dialing memory when not in use. Bell tap suppression circuitry is included to prevent the ringer from responding to sporadic voltage transients on the transmission lines, allowing the telephone can be installed in parallel with other phones.

US Patent:

52356370, Aug 10, 1993

Filed:

Feb 13, 1992

Appl. No.:

7/836546

Inventors:

Vladimir Kraz - Santa Cruz CA
Paul Regen - Felton CA
Wayne Stade - Aptos CA
Jeff Wimsatt - Aptos CA
Robert Young - Santa Cruz CA

Assignee:

Plantronics, Inc. - Santa Cruz CA

International Classification:

H04M 160

US Classification:

379387

Abstract:

An apparatus 10 controls the two-way communication between the microphone 12 and speaker 36 of a telephone headset and a telephone base. A transmit channel 15 includes an expander 18 that controllably attenuates the transmitted communication signal when the user is not speaking into the microphone 12. Conversely, a receive channel 30 includes a compressor 34 that controllably attenuates the received communication signal to prevent over driving the speaker 36.