Back to results
US 7,406,302 B1Granted
Digital FM stereo receiver architecture
AssigneeMarvell International Ltd.
InventorHui-Ling Lou
Life of this patent
Estimating the term…
Abstract
Systems and techniques for digital processing of FM stereo signals are described. A carrier signal such as a 38 kHz carrier may be recovered and used to process a difference signal such as a left minus right signal. The left minus right signal and a left plus right signal may be used to generate separate left plus right signals.
Claims42
A receiver system, comprising:
- a received signal input configured to receive a digital signal based on a received mono signal or a received stereo signal;
- a stereo detector in communication with the received signal input, the stereo detector configured to produce a stereo detection output, the stereo detection output indicative of a received stereo signal or a received mono signal;
- a carrier recovery module in communication with the received signal input, the carrier recovery module configured to recover a carrier signal based on the digital signal;
- a multiplexer having a first input in communication with the carrier recovery module and the received signal input, the multiplexer further having a second input in communication with the received signal input, the multiplexer further in communication with the stereo detector, the multiplexer configured to generate an output signal based on the stereo detection output on a multiplexer output;
- and
- a digital signal processor in communication with the multiplexer output.
3 more elements
A receiver system, comprising:
- a received signal input means for receiving a digital signal based on a received mono signal or a received stereo signal;
- stereo detection means in communication with the received signal input means, the stereo detection means for producing a stereo detection output, the stereo detection output indicative of a received stereo signal or a received mono signal;
- carrier recovery means in communication with the received signal input means, the carrier recovery means for recovering a carrier signal based on the digital signal;
- multiplexing means having a first input means in communication with the carrier recovery means and the received signal input means, the multiplexing means further having a
- second input means in communication with the received signal input means, the multiplexing means further in communication with the stereo detection means, the multiplexing means
- generating an output signal on a multiplexer output means, the output signal of the multiplexing means based on the stereo
- detection output;
- and
- a digital signal processing means in communication with the multiplexer output means.
6 more elements
A method of processing a received FM signal, comprising:
- determining whether the received FM signal is based on mono transmission or stereo transmission;
- and
- if the received FM signal is based on stereo transmission:
- recovering a carrier signal is based on the received FM signal;
- generating a digital signal indicative of a difference between left and right signals based on the received FM signal using the carrier signal;
- generating a digital left plus right signal based on the received FM signal;
- processing the digital signal indicative of the difference between left and right signals in a processing module to generate a processed difference signal;
- processing the digital left plus right signal in the processing module to generate a processed left plus right signal;
- generating a digital left signal based on the processed difference signal and the processed left plus right signal;
- and
- generating a digital right signal based on the processed difference signal and the processed left plus right signal.
8 more elements
A computer program stored on a computer readable medium operable to cause one or more machines to perform operations comprising:
- determining whether the received FM signal is based on mono transmission or stereo transmission;
- and
- if the received FM signal is based on stereo transmission:
- recovering a carrier signal based on the received FM signal;
- generating a digital signal indicative of the difference between left and right signals based on the received FM signal using the carrier signal;
- generating a digital left plus right signal based on the received FM signal;
- processing the digital signal indicative of the difference between left and right signals in a processing module to generate a processed difference signal;
- processing the digital left plus right signal in the processing module to generate a processed left plus right signal;
- generating a digital left signal based on the processed difference signal and the processed left plus right signal;
- and
- generating a digital right signal based on the processed difference signal and the processed left plus right signal.
8 more elements
Dependencies are inferred from the claim text.