Radio receiver having switch for switching between a wide filter and a narrow filter
First Claim
1. A radio receiver comprising:
- a wide filter and a narrow filter for receiving an output of a front end and for outputting intermediate frequency signals;
a first detector for receiving the intermediate frequency signal from said wide filter and a second detector for receiving the intermediate frequency signal from said narrow filter, said first and second detectors demodulating the intermediate frequency signals to output first and second demodulated signals;
a subtractor for outputting a difference between said first and second demodulated signals;
a switch being switched to a first position for directing said first demodulated signal from said first detector to an output circuit when the difference is below a reference level, and being switched to a second position for directing said second demodulated signal from said second detector to the output circuit when the difference is above the reference level.
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Accused Products
Abstract
A radio receiver is disclosed having a wide filter and a narrow filter, each of which is connected with the front end and outputs an intermediate frequency signal. To the output of the filters are connected first and second detectors, respectively. A subtracter receives the outputs of the detectors and subtracts one from the other. A switch receives the output of the subtracter and directs the outputs of detectors in such a way that the switch is switched to a first position for directing the demodulated output from the first detector to a following circuit when the difference is below a reference level, and to a second position for directing the demodulated output from the second detector to the following circuit when the difference is above the reference level.
87 Citations
10 Claims
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1. A radio receiver comprising:
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a wide filter and a narrow filter for receiving an output of a front end and for outputting intermediate frequency signals; a first detector for receiving the intermediate frequency signal from said wide filter and a second detector for receiving the intermediate frequency signal from said narrow filter, said first and second detectors demodulating the intermediate frequency signals to output first and second demodulated signals; a subtractor for outputting a difference between said first and second demodulated signals; a switch being switched to a first position for directing said first demodulated signal from said first detector to an output circuit when the difference is below a reference level, and being switched to a second position for directing said second demodulated signal from said second detector to the output circuit when the difference is above the reference level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification