Digital zero IF selectivity section

Details Digital zero IF selectivity section Digital zero IF selectivity section

1986-05-12

1988-03-22

Griffin, Robert L.

Pulse or digital communications

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375 75, 375122, 364825, 328167, H04B 110, G06G 702

Patent

active

047334037

ABSTRACT:
Disclosed is a digital zero-IF selectivity section circuit which operates on a recovered input signal, digitally clocked by a first clock at a rate of FS, in receiver device. The circuit uses a second clock operating at a lesser rate than the first clock to clock an N-order FIR digital filtering means to selectively band-limit the frequency spectrum of the recovered input signal. A second digital filtering means is coupled to the output of the first FIR digital filtering means. The second digital filtering means operates at a clock speed less than or equal to the second clock speed. The second digital filtering means is used to further selectively band-limit the frequency spectrum of the recovered input signal.

REFERENCES:
patent: 3303335 (1967-02-01), Pryor
patent: 3979701 (1976-09-01), Tomozawa
patent: 4057759 (1977-11-01), Genova et al.
patent: 4246653 (1981-01-01), Malm
patent: 4313211 (1982-01-01), Leland
patent: 4346477 (1982-08-01), Gordy
patent: 4356559 (1982-10-01), Candy et al.
patent: 4384357 (1983-05-01), deBuda et al.
patent: 4419759 (1983-12-01), Poklemba
patent: 4455680 (1984-06-01), Villarreal
patent: 4559499 (1984-03-01), Bursztejn
patent: 4589110 (1986-05-01), Eng et al.
patent: 4623922 (1986-11-01), Wischermann
"Improved Decimating FIR Filter", by Lambert and Longley, Motorola Technical Developments, vol. 5, Oct. 1985, pp. 39-40.
"New Recursive Digital Filter Structures Having Very Low Sensitivity and Roundoff Noise, by Agaral et al., IEEE Trans. on Circuits and Systems, vol. CAS-22, No. 12, Sec. 1975.
"Low Sensitivity Digital Ladder Filters", by Bruton, IEEE Trans. on Circuits and Systems, vol. CAS-22, No. 3, Mar. 1975.
"Low Cost RF/LST Technologies for Commercial GPS Receivers", by Chao, Microwave System, App. Technology Conf., Wash., D.C., Mar. 1983.
"A Low-Cost GPS Land Receiver for Land Navigation", by Yiu et al., Journal of the Institute of Navigation, vol. 29, No. 3, Fall 1982.
"Digital Filtering by Polyphase Network: Application to Samples Rate Alteration and Filter Banks", by Bellanger et al., IEEE Trans. on Acoustics, Speech, and Signal Processing, vol. ASSP-24, No. 2, Apr. 1976.
"A Digital Frequency Synthesizer", by Tierney et al., IEEE Trans. on Audio and Electroacoustics, vol. AV-19, No. 1, Mar. 1971.
"Digitizing Multiple of Signals Requires an Optimum Sampling Rate", by Stephenson, Electronics, pp. 106-110, Mar. 27, 1972.

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