Narrow-band filter having a variable center frequency

Details Narrow-band filter having a variable center frequency Narrow-band filter having a variable center frequency

H - Electricity

03

J

H03J 5/28 (2006.01) H03H 19/00 (2006.01)

Patent

CA 2115182

In a narrow-band filter for filtering an input signal having a predetermined frequency and comprising first through n-th low-pass filters (13-l to 13-n) which are connected in parallel to one another, a switching circuit time divisionally connects the first through the n-th low-pass filters between input and output terminals (11, 12). The first through the n-th low-pass filters, thereby, time divisionally filters the input signal for first through n-th filtering durations, respectively. A control circuit (30) is supplied with a frequency designation signal designating the predetermined frequency and controls the switching circuit to change at least one of the first through the n-th filtering durations in accordance with the frequency designation signal.

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