AM/FM/IBOC receiver architecture
AssigneeVisteon Global Technologies, Inc.
InventorsJ. William Whikehart, John Elliott Whitecar, Darby Edward Hadley
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Abstract
An RF receiver operates to receive broadcast RF signals that include at least one of an analog portion and a digital portion. The RF receiver performs processing of the analog portion and/or the digital portion to generate a digital path signal. The RF receiver performs further processing of the analog portion to generate a first audio signal. A digital modulation processing system may be electrically connected with the RF receiver. The digital modulation processing system may receive and process the digital path signal to generate a second audio signal. The RF receiver may selectively utilize at least one of the first audio signal and the second audio signal to generate an audio output.
Claims59
A radio frequency receiver operable with a digital modulation processing system to process a radio frequency signal, the radio frequency signal including at least one of analog modulation and digital modulation, the radio frequency receiver comprising:
- a digital down converter circuit operable to produce a common path signal comprising at least one of the analog modulation and the digital modulation, the common path signal available to the digital modulation processing system to generate a second audio signal;
- a demodulator circuit electrically coupled with the digital down converter circuit, the demodulator circuit operable to demodulate the analog portion of the common path signal to form a first audio signal;
- and
- a combiner circuit electrically coupled with the demodulator circuit with provision to receive the second audio signal, the combiner circuit operable to selectively utilize at least one of first audio signal and the second audio signal to produce a preliminary audio output.
A radio frequency receiver operable with a digital modulation processing system to receive and process a radio frequency signal, the radio frequency receiver comprising:
- a processing circuit operable to produce a digital path signal and a first audio signal with the radio frequency signal, the digital path signal available to the digital modulation processing system to generate a second audio signal;
- and
- a signal control circuit electrically coupled with the processing circuit with provision to receive the second audio signal, the signal control circuit operable to selectively process at least one of the first audio signal and the second audio signal to produce an audio output.
A receiver system for processing a radio frequency signal that includes at least one of an analog portion and a digital portion, the receiver system comprising:
- a processing circuit operable to generate a digital path signal comprising at least one of the analog portion and the digital portion of the radio frequency signal, the processing circuit operable to generate a first audio signal when the analog portion is present;
- and
- a digital modulation processing system electrically coupled with the processing circuit, the digital modulation processing system operable to generate a second audio signal from the digital path signal when the digital portion is present.
A receiver system for processing a radio frequency signal, the receiver system comprising:
- a digital down converter circuit operable to generate a digital path signal from the radio frequency signal;
- a decimation circuit electrically coupled with the digital down converter circuit, the decimation circuit operable to generate an analog path signal from the digital path signal;
- a demodulation circuit electrically coupled with the decimation circuit, the demodulation circuit operable to demodulate the analog path signal to produce a first audio signal;
- a digital modulation processing system electrically coupled with the digital down converter circuit, the digital modulation processing system operable to process the digital path signal to produce a second audio signal;
- and
- a combiner circuit electrically coupled with the digital modulation processing system and the demodulation circuit, the combiner circuit operable to selectively utilize at least one of the first audio signal and the second audio signal to produce a preliminary audio output.
A method of processing a radio frequency signal that includes at least one of analog modulation and digital modulation, the method comprising:
- a) commonly processing the radio frequency signal to produce a common path signal comprising at least one of the analog modulation and the digital modulation;
- b) providing the common path signal at an interface, the common path signal available at the interface for use in production of a second audio signal;
- and
- c) demodulating the analog modulation within the common path signal to generate a first audio signal.
A method of processing a broadcast signal, the method comprising:
- a) receiving a radio frequency signal;
- b) translating the radio frequency signal to produce an intermediate frequency signal;
- c) down converting the intermediate frequency signal;
- d) filtering the intermediate frequency signal to produce a digital path signal;
- e) filtering the digital path signal to produce an analog path signal;
- f) processing the analog path signal to generate a first audio signal;
- g) processing the digital path signal to generate a second audio signal;
- and
- h) selecting at least one of the first audio signal and the second audio signal to produce an audio output.
Dependencies are inferred from the claim text.