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US 5,168,508 AGranted
Spread spectrum receiver
AssigneeClarion Co., Ltd.
InventorsKenju Iwasaki, Yoshitaka Uchida
Life of this patent
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Abstract
A spread spectrum receiver is disclosed, in which a spread spectrum received signal is separated into at least 3 frequency band channels; signal components in the different channels are compared in the magnitude; and the signal components in the different frequency bands are combined after having attenuated greater ones, in order to eliminate interference waves from the inputted signal.
Claims7
A spread spectrum receiver comprising:
- channel separating means for separating a spread spectrum received signal into at least 3 frequency band channels;
- comparing means for comparing signal components in the different channels in the magnitude;
- output level regulating means disposed in each of the channels;
- control means for controlling said regulating means, depending on a result of comparison obtained by said comparing means to attenuate outputs of channels having output levels;
- and
- synthesizing means for combining the outputs of the different channels through the respective regulating means to synthesize a final output signal.
3 more elements
A spread spectrum receiver comprising:
- received signal separating means for separating a spread spectrum received signal including disturbing waves into at least 3 frequency band channels having different central frequencies;
- a group of switches, each of the switches being disposed for every band channel to turn-on/off the output thereof;
- synthesizing means for combining the outputs of the different channels obtained through the respective regulating means to synthesize a final output signal;
- and
- comparing/judging means including detecting means for detecting the magnitude of each of band signals separated by said separating means;
- calculating means for calculating level differences between different detected values from said detecting means;
- and judging means for ON/OFF controlling the switches, each of which is disposed in each of the channels, on the basis of the output of said calculating means.
4 more elements
A spread spectrum receiver comprising:
- received signal separating means for separating a spread spectrum received signal including disturbing waves into at least 3 frequency band channels having different central frequencies;
- a group of switches, each of the switches being disposed for every band channel to turn-on/off the output thereof;
- synthesizing means for combining the outputs of the different channels obtained through the respective switches to synthesize a final output signal;
- correcting means for extracting the signal in each of said separated frequency band channels and weighting it with the electric power spectre;
- comparing/judging means for controlling said switches on the basis of the signal in each of the channels weighted by said correcting means;
- wherein said comparing/judging means consists of following first to fourth means;
- said first means comparing the signals in the different weighted channels in the magnitude and arranging them in an order determined depending on the magnitude;
- said second means comparing the signals in the different frequency band channels corrected by said correcting means with a predetermined threshold value to detect the channels, where there exist disturbing waves;
- said third means judging a block number indicating the priority of the switching-off set for every channel;
- said fourth means controlling said switching-off on the basis of said first, second and third means.
7 more elements
Dependencies are inferred from the claim text.