Transmitter battery like indication apparatus and method

Details Transmitter battery like indication apparatus and method Transmitter battery like indication apparatus and method

1996-04-16

1998-08-11

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

455343, H04Q 302, H04B 116

Patent

active

057941254

ABSTRACT:
A method and apparatus for determining the status of a battery that powers a wireless microphone transmitter. The transmitter has a tone oscillator that produces a tone of a frequency beyond the audible limit which is transmitted, along with acoustical signals, to a receiver. The amplitude of the tone is changed as the battery voltage of the transmitter decreases. The receiver for the transmitter includes a circuit that detects the changes in amplitude of the high frequency tone. The front panel of the receiver, for example, may contain an LCD display on which a battery fuel gauge is present, indicating the remaining battery life of transmitter. When an amplitude change beyond a threshold is detected, the fuel gauge is updated, and the respective bar on the gauge is turned off.

REFERENCES:
patent: 3569816 (1971-03-01), Marzolf
patent: 4012597 (1977-03-01), Lynk, Jr. et al.
patent: 5130633 (1992-07-01), Maruichi
patent: 5142563 (1992-08-01), Nyuu et al.
patent: 5565782 (1996-10-01), Sato
patent: 5568448 (1996-10-01), Tanigushi et al.

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