H - Electricity – 03 – L
Patent
H - Electricity
03
L
325/30
H03L 7/22 (2006.01) H03L 7/18 (2006.01) H03L 7/23 (2006.01)
Patent
CA 1257337
ABSTRACT OF THE DISCLOSURE In a broadcast telephone system for communi- cating information signals over an assigned frequency channel, the combination of a synthesizer for gener- ating a signal at the assigned frequency and a PROM storing a plurality of sets of first and second signals associated with different predetermined assignable fre- quencies. The synthesizer includes a first phase- locked loop for generating an output signal at a fre- quency within a first predetermined range including the plurality of assignable frequencies in response to the combination of a first frequency reference signal having a predetermined frequency and a second reference fre- quency signal having a frequency within a second pre- determined range and derived from a second phase- locked loop a second phase-locked loop for generating a third reference frequency signal within a third pre- determined range in response to a combination of a first signal from the PROM associated with a given assignable frequency and a fourth frequency reference signal having a predetermined frequency; and a fre- quency divider coupled to the PROM for dividing the frequency of the output signal from the second phase- locked loop by an amount indicated by a second signal from the PROM associated with said given assignable frequency to provide the second reference signal to the first phase-locked loop. The phase-locked loops each include a minimizing phase noise and electronic noise due to microphonics.
526878
Interdigital Technology Corporation
Ridout & Maybee Llp
LandOfFree
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