Apparatus for extracting a carrier frequency

Details Apparatus for extracting a carrier frequency Apparatus for extracting a carrier frequency

2005-04-12

2005-04-12

Trinh, Sonny (Department: 2687)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S192300, C455S205000, C455S313000, C375S326000

Reexamination Certificate

active

06879815

ABSTRACT:
A frequency extractor extracts an input frequency of an input signal. The frequency extractor includes a frequency multiplier, first and second filters, a binary circuit and a frequency divider. The frequency multiplier obtains a signal of a multiplied frequency, the multiplied frequency being N times the input frequency, N being an integer greater than 1. The first filter, having a first bandwidth, filters the signal of the multiplied frequency to provide a first filtered signal. The binary circuit binarizes the first filtered signal to a binary signal. The frequency divider divides the binary signal by a factor of N to provide a divided signal. The second filter, having a second bandwidth, filters the divided signal to generate the input frequency in a form of a continuous wave, wherein the second bandwidth is about 1/N times the first bandwidth.

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