Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1993-07-01
1995-09-05
Kuntz, Curtis
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379390, 455219, 4552341, 4552342, 381107, H04Q 722, H04M 1100
Patent
active
054486203
ABSTRACT:
FIGS. 2 and 3 illustrate communications devices (30) that are operable in both a radio dispatch mode and a telephone interconnect mode. To mitigate the problem of a relatively high level audio signal from being unexpected broadcast from an ear-piece of the device (30) when the ear-piece is proximally located with an ear of a user of the device, the communications device (30) is arranged to ensure that, at least during an initial period of operation in either of the two operating modes, audio signals of relatively high level do not originate from the ear-piece, thereby preventing a change in audio power output from the ear-piece that may potentially cause damage to the hearing of a user of the radio communications device.
REFERENCES:
patent: 4718110 (1988-01-01), Schaefer
patent: 4829565 (1989-05-01), Goldberg
patent: 5081407 (1992-01-01), Schorman et al.
patent: 5130665 (1992-07-01), Walden
patent: 5172408 (1992-12-01), Petty et al.
patent: 5175872 (1992-12-01), Borras
patent: 5189705 (1993-02-01), Lavaud
patent: 5265264 (1993-11-01), Dzung et al.
Gershkovich Izidor
Kashtan Aharon
Ramon Eytan
Rapoport Gil
Schwartzman Zalman
Kuntz Curtis
Motorola Inc.
Scutch, III Frank M.
Trost William
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