×

Digital data and analog radio frequency transmitter

  • US 5,010,585 A
  • Filed: 06/01/1990
  • Issued: 04/23/1991
  • Est. Priority Date: 06/01/1990
  • Status: Expired due to Term
First Claim
Patent Images

1. An RF transmitter for transmitting either analog voice or digital data comprising:

  • multiplexing means for switching between an analog voice input and digital data inputs to provide a selected signal, numerical oscillator means connected to the output of the multiplexing means for converting the selected signal to a digitally modulated numeric frequency signal,D/A conversion means connected to the output of the numerical oscillator means for converting the digitally modulated numeric frequency signal to an analog signal,first upconversion means connected to the output of the D/A conversion means for upconverting the analog signal to a first higher frequency signal,variable RF source means for providing a selected accurate preset frequency signal within a range of frequencies,second upconversion means connected to the output of the variable RF source means for upconverting the preset frequency signal to a second higher frequency signal,mixing means connected to the output of both the first and second upconversion means to provide a modulated signal,clock means connected to the numerical oscillator means, the variable RF source means and the first and second upconversion means for providing synchronization for each said means.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×