Digital radio receiver with program-controlled mixing oscillator frequency

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United States of America Patent

PATENT NO 5195109
SERIAL NO

07650042

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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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.

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Patent Owner(s)

Patent OwnerAddress
BLAUPUNKT-WERKE GMBH A LIMITED LIABILITY COMPANY OF THE FED REP OF GERMANYROBERT-BOSCH-STRASSE 200 D-3200 HILDESHEIM

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bochmann, Harald Hannover, DE 8 337
Hagenauer, Joachim Seefeld, DE 11 569
Hoher, Peter Seefeld, DE 2 88
Schulze, Henrik Peine, DE 5 100

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