Synchronous radio or television receiver with analog high freque

Details Synchronous radio or television receiver with analog high freque Synchronous radio or television receiver with analog high freque

1982-04-07

1984-08-07

Ng, Jin F.

Pulse or digital communications

Spread spectrum

Direct sequence

375 81, 375 77, 455265, H04L 2706

Patent

active

044647700

ABSTRACT:
A synchronous receiver comprising a high frequency section realized by analog components, including an input preamplifier followed by two quadrature operated mixers with associated .pi./2 phase shifter and a voltage controlled oscillator wherein the high frequency signal is converted by multiplication by means of a phase locked loop directly into the base band and lowpass filters following the mixers for select out interfering mixed products, and a low frequency section following the high frequency section. The receiver is used as a radio or television receiver and the low frequency section is realized by digital components.

REFERENCES:
patent: 3181122 (1965-04-01), Brown
patent: 3669511 (1972-06-01), Motley et al.
patent: 3675131 (1972-07-01), Pickholtz
patent: 3701948 (1972-10-01), McAuliffe
patent: 3818347 (1974-06-01), Holsinger
patent: 4100499 (1978-07-01), Monrolin
Vitorbi, A. J., "Principals of Coherent Communication", McGraw-Hill, New York, 1966, pp. 14-19.
Gupta, S. C.: On Optimum Digital Phase Locked Loops, Southern Methodist University, Dallas, Texas, pp. 340-344.
Herrmann, O., "Transversalfiler zur Hilbert-Transformation", Archiv Der Elektrischun Ubertragung (A.E.U), Dec. 1969, vol. 23, No. 12, S. Hirzel Verlag, Stuttgart, Federal Republic of Germany.
Ludloff, A., "Zum Stand der Signatverarbeitung bei Rundsuchradars", NTZ, vol. 29, No. 9, (1976), pp. 647-651.
Ludloff, A., "Probleme der Radarsignalverarbeitung bei Pulskompression mittels Phasenumtastung", Symposium on Radar Technique, 1972, Dusseldorf, Library of DGON, No. 106, pp. 265-283.

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