FM band multiple signal modulator
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United States of America Patent
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-
Oct 31, 1995
Grant Date -
N/A
app pub date -
Jan 28, 1994
filing date -
Jan 28, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus and a method for generating all of the assignable carrier frequencies in the FM broadcast band and for frequency modulating the generated carriers includes a generator of a train of pulses having a crystal-controlled repetition frequency and a specific pulse shape which together produce a spectrum of odd harmonics of the pulse repetition frequency whose separation in frequency is identical to that of the assignable carrier frequencies. This pulse train is then mixed with a 98.0 MHz sine wave to translate the spectrum to the FM band. Simultaneous modulation of all the carriers is achieved by frequency modulating the 98.0 MHz sine wave, whereby the same modulation is imparted simultaneously to all of the carriers.
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