Digital radio receiver with program-controlled mixing oscillator

Details Digital radio receiver with program-controlled mixing oscillator Digital radio receiver with program-controlled mixing oscillator

1991-02-04

1993-03-16

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

4551611, H04B 710, H04L 102

Patent

active

051951096

ABSTRACT:
A novel receiver for subcarriers in a radio broadcasting system is described, in which the characteristic frequency of the mixing oscillator is varied under program control. An incoming signal from antenna 1 passes through an input stage 2 to a mixing stage 3. Mixing stage 3 receives the output of an oscillator 4. The output of the mixing stage passes into an intermediate frequency filter stage 5, which preferably includes A/D converters 13 and demultiplexers 14. Stage 5 feeds a plurality of demodulators 6, which may include equalizers 12. Buffer memories 7 store information from demodulated subcarrier signals, and feed an evaluation unit 8. Evaluation unit 8 has a first output which drives a speaker 9 and a second output which is applied to a memory 11. A control unit 10, connected to the output of memory 11, controls the frequency generated by mixing oscillator 4. This system facilitates digital signal transmission by compensating for poor transmission conditions which would otherwise cause serious dropouts in the digital signal.

REFERENCES:
patent: 4349915 (1982-09-01), Costas
patent: 4479215 (1984-10-01), Baker
patent: 4616364 (1986-10-01), Lee
patent: 4935940 (1990-06-01), Reindl
patent: 5014348 (1991-05-01), Boone et al.
Digital Communications, 2nd Edition, by John G. Proakis, McGraw-Hill, New York; copyright 1989, pp. 267-269 and FIG. 4.2.16.
M. Alard & R. Lassalle, "Principles of Modulation & Channel Coding For Digital Broadcasting for Mobile Receivers," Eur. Broadcasting Union Review--Technical No. 224, pp. 47-69 (Aug. 1987).
Information Transmission, Modulation and Noise, 2nd Edition, Prof. Mischa Schwartz, McGraw-Hill, New York; copyr. 1959, 1970; pp. 188-203.

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