Receiving apparatus and method and provision medium

Details Receiving apparatus and method and provision medium Receiving apparatus and method and provision medium

2006-07-18

2006-07-18

Bayard, Emmanuel (Department: 2638)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

Reexamination Certificate

active

07079602

ABSTRACT:
An interference signal from an adjacent signal is prevented and a desired signal demodulated.A frequency conversion circuit4converts a received signal frequency to a first intermediate frequency signal of a first intermediate frequency higher than the frequency of the signal to be demodulated by 57 MHz. The first intermediate frequency signal is further converted to a second intermediate frequency signal of a second intermediate frequency by a frequency conversion circuit8. The second intermediate frequency is a frequency lower than the 57 MHz of the first intermediate frequency by exactly a frequency ½ of an FFT sampling f-clock. A clock generation circuit11generates a signal of a frequency two times the FFT sampling clock, that is, four times the second intermediate frequency. The second intermediate frequency is sampled by the A/D conversion circuit10based on the signal supplied from the clock generation circuit11, demodulated by a demodulation circuit12, and subjected to an FFT operation by an FFT circuit13, whereby the signal is demodulated.

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