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Frequency modulation transmitter for voice or data

  • US 4,418,416 A
  • Filed: 04/06/1981
  • Issued: 11/29/1983
  • Est. Priority Date: 04/06/1981
  • Status: Expired due to Term
First Claim
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1. In a frequency modulation transmitter for transmitting a first signal or a second data signal, a data preemption circuitcharacterized bya data modulator and control circuit (312, 302, 307) for generating a modulated data signal (J) and a control signal (K) indicating the presence of data,a signal muting switch (405), responsive to the control signal of the data modulator and control circuit, for muting the first signal, anda gain switch (406), responsive to the control signal of the data modulator and control circuit, for attenuating the level of the modulated data signal.

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