High-speed correlating device
First Claim
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1. A high-speed correlating device for delivering an output correlation signal which is the result of the correlation of two input signals in the form of successive samples, comprising:
- at least a first and second memory for storing respectively samples of said two input signals;
a synchronizing circuit for controlling the read out from said first and second memory simultaneously with a time inversion for the read out of one of said first and second memories;
an oscillator for producing a carrier wave;
first amplitude modulating means for modulating the amplitude of said carrier wave by using the information read out from said first memory, said first amplitude modulating means delivering a first analogue signal reconstituted in the form of a modulation of the amplitude of the carrier wave;
second amplitude modulating means for modulating the amplitude of said carrier wave by using the information read out from said second memory, said second amplitude modulating means delivering a second analogue signal reconstituted in the form of a modulation of the amplitude of the carrier wave;
an electroacoustical convolver device for receiving the respective first and second analogue signals; and
means for filtering and detecting the modulation of the output signal from the convolver and delivering said output correlation signal.
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Abstract
The invention relates to high-speed correlating arrangements. Input memories receive the signals to be correlated in the form of successions of samples. At read-out of samples in the memories, the time scale of one of the signals is reversed and the two series of samples are used to modulate a wave supplied by an oscillator. The two modulated carriers are applied to an electroacoustic convolver from which, after detection and filtering, the correlation function of the input signals is obtained.
27 Citations
9 Claims
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1. A high-speed correlating device for delivering an output correlation signal which is the result of the correlation of two input signals in the form of successive samples, comprising:
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at least a first and second memory for storing respectively samples of said two input signals; a synchronizing circuit for controlling the read out from said first and second memory simultaneously with a time inversion for the read out of one of said first and second memories; an oscillator for producing a carrier wave; first amplitude modulating means for modulating the amplitude of said carrier wave by using the information read out from said first memory, said first amplitude modulating means delivering a first analogue signal reconstituted in the form of a modulation of the amplitude of the carrier wave; second amplitude modulating means for modulating the amplitude of said carrier wave by using the information read out from said second memory, said second amplitude modulating means delivering a second analogue signal reconstituted in the form of a modulation of the amplitude of the carrier wave; an electroacoustical convolver device for receiving the respective first and second analogue signals; and means for filtering and detecting the modulation of the output signal from the convolver and delivering said output correlation signal. - View Dependent Claims (2, 3, 4)
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5. A high-speed correlating device for delivering an output correlation signal which is the result of the correlation of two input signals in the form of successive samples, comprising:
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at least a first and second memory for storing respectively said two input signal samples; a synchronizing circuit for controlling the read out from said first and second memory simultaneously with a time inversion for the read out of one of said first and second memories; an oscillator for producing a carrier wave; first phase modulating means for modulating the phase of said carrier wave by using the information read out from said first memory, said first phase modulating means delivering a first analogue signal reconstituted in the form of a modulation of the phase of the carrier wave; second phase modulating means for modulating the phase of said carrier wave by using the information read out from said second memory, said second phase modulating means delivering a second analogue signal reconstituted in the form of a modulation of the carrier wave; an electroacoustical convolver device for receiving the respective first and second analogue signal; and means for filtering and detecting the modulation of the output signal from the convolver and delivering said output correlation signal. - View Dependent Claims (6, 7, 8)
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9. A high-speed correlating device for delivering an output correlation signal which is the result of the correlation of two input signals in the form of successive samples, comprising:
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at least a first and second memory for storing respectively said two input signal samples; a synchronizing circuit for controlling the read out from said first and second memory simultaneously with a time inversion for the read out of one of said first and second memories; an oscillator for producing a carrier wave; first modulating means for modulating said carrier wave by using the information read out from said first memory, said first modulating means delivering a first analogue signal reconstituted in the form of a modulation of the carrier wave; second modulating means for modulating said carrier wave by using the information read out from said second memory, said second modulating means delivering a second analogue signal reconstituted in the form of a modulation of the carrier wave; an electroacoustical convolver device for receiving the respective first and second analogue signal; and means for filtering and detecting the modulation of the output signal from the convolver and delivering said output correlation signal.
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Specification