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Automatic Frequency Shift Keying (FSK) tuning circuit for a hearing aid and method

  • US 9,020,063 B2
  • Filed: 05/15/2014
  • Issued: 04/28/2015
  • Est. Priority Date: 11/25/2011
  • Status: Active Grant
First Claim
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1. A frequency-shift-keying (FSK) transceiver for use in a hearing aid, said transceiver having a resonant circuit comprising at least a fixed inductance, a fixed capacitance and a variable capacitance, wherein the transceiver comprises:

  • an FSK modulator,a transmitting amplifier,a receiving amplifier, andmeans for controlling the tuning frequency of the resonant circuit to a desired frequency,said tuning means comprising a phase difference detector and a tuning manager,the phase difference detector being adapted for measuring the phase difference across the fixed capacitance,the tuning manager comprisingmeans for receiving symbols from a transmission data buffer,means for receiving measured phase differences from the phase difference detector,means for comparing a first phase difference corresponding to a first, received symbol with a second phase difference corresponding to a second, received symbol andmeans for adjusting the value of the variable capacitance according to the difference between the first phase difference and the second phase difference in order to control the tuning frequency of the resonant circuit.

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