H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 15/00 (2006.01) H03G 3/20 (2006.01) H04B 1/10 (2006.01) H04B 1/16 (2006.01) H04B 7/005 (2006.01)
Patent
CA 2155432
In a circuit which limits to a fixed value the amplitude of a pilot signal received along with a modulated signal, mixes said amplitude-limited pilot signal with the modulated signal, and uses the random FM noise contained in the pilot signal to cancel the random FM noise contained in said modulated signal: the desired signal to be received is selected from the input signal at the high frequency band; this output is converted to a low frequency band signal by means of a frequency converter; and the extraction of the pilot signal and the cancellation of the random FM noise is performed in the low frequency band, whereby the characteristics required for the high frequency band-pass filter are relaxed.
Nippon Telegraph & Telephone Corporation
Uren John Russell
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