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Dual-mode radiotelephone apparatus for digital or analog modulation

  • US 6,546,044 B1
  • Filed: 10/11/1996
  • Issued: 04/08/2003
  • Est. Priority Date: 10/11/1996
  • Status: Expired due to Term
First Claim
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1. A radio transmitter/receiver for selectively transmitting digitally modulated signals in a digital mode or analog modulated signals in an analog mode comprising:

  • digital signal processing means having an input for receiving an information signal, a first output for supplying an In-phase modulating signal I and a second output for supplying a Quadrature modulating signal Q;

    quadrature modulation means coupled to the first and second outputs for digitally modulating a carrier frequency in the digital mode to produce a digitally modulated signal; and

    analog modulation means coupled to the first and second outputs for generating an analog modulation of a carrier frequency in the analog mode to produce an analog modulated signal, wherein said In-phase modulating signal I and said Quadrature modulating signal Q bypass said quadrature modulation means in order to produce said analog modulated signal.

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