Telecommunications – Transmitter and receiver at separate stations – Short range rf communication
Patent
1991-09-13
1994-01-04
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Short range rf communication
455127, 381 79, H04B 500
Patent
active
052769100
ABSTRACT:
The present invention comprises a hearing system apparatus and method for electromagnetically communicating signals to a magnetic transducer. The apparatus includes a signalling circuit for producing a pulse-width modulated current signal. An antenna means is coupled to the signalling circuit for producing a variable electromagnetic field whose energy intensity is modulated by the output of the signalling circuit. In addition, an energy storage circuit is coupled to the antenna for storing a substantial portion of the energy stored in the magnetic field produced by the antenna when the magnetic field collapses between cycles of the current signal. Also, an energy recycling circuit is coupled to the storage circuit and the antenna for recovering the energy stored in the storage circuit for use in the next electromagnetic field cycle.
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patent: 4631736 (1986-12-01), Yamanoue et al.
patent: 4689819 (1987-08-01), Killion
"An Output Amplifier Whose Time Has Come", Elmer V. Carlson, Hearing Instruments, vol. 39, No. 10, 1988.
"Dispenser Sound Quality Perceptions of Class D Integrated Receivers", Sergei Kochkin, Ph.D. and William J. Ballad, Hearing Instruments, vol. 42, No. 4, 1991.
"Applications Note for the Knowles EP Integrated Receiver", A. Ditthardt, Knowles Electronic, Inc., Itasca, Ill., Jan. 3, 1990.
Eisenzopf Reinhard J.
Pham Chi
ReSound Corporation
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