Digital correlation system having an adjustable impulse generator

Claim 1

A DIGITAL FILTER HAVING AN ADJUSTABLE IMPULSE RESPONSE FOR FILTERING AN ANALOG INPUT SIGNAL SUPPLIED TO SAID FILTER COMPRISING: CONVERSION MEANS FOR PROVIDING DIGITAL VALUES OF THE ANALOG INPUT SIGNAL, SAMPLING MEANS CONNECTED TO SAID CONVERSION MEANS FOR SEQUENTIALLY ENABLING SAID CONVERSION MEANS AT PREDETERMINED TIMES, DIGITAL STORAGE MEANS CONNECTED TO SAID CONVERSION MEANS FOR RECEIVING DIGITAL VALUES OF SAID INPUT SIGNAL, SAID DIGITAL STORAGE MEANS REGENERATIVELY SHIFTING SAID DIGITAL VALUES WITHIN SAID STORAGE MEANS AT A PREDETERMINED TIME INTERVAL, CLOCK PULSE GENERATING MEANS CONNECTED TO SAID SAMPLING MEANS AND SAID DIGITAL STORAGE MEANS FOR ENABLING SAID SAMPLING MEANS AT A FIRST PREDETERMINED TIME INTERVAL AND SAID DIGITAL STORAGE MEANS AT A SECOND PREDETERMINED TIME INTERVAL, DIGITAL IMPULSE GENERATOR MEANS FOR PROVIDING DIGITAL IMPULSE RESPONSE SIGNALS IN A PREDETERMINED SEQUENCE, SAID GENERATOR MEANS COMPRISING ADJUSTABLE DIGITAL SWITCHES FOR PRESETTING THE IMPULSE RESPONSE OF SAID FILTER, COMMUTATING MEANS CONNECTED TO SAID DIGITAL SWITCHES FOR SEQUENTIALLY INTERROGATING SAID DIGITAL SWITCHES, AND PULSE GENERATING MEANS CONNECTED TO SAID COMMUTATING MEANS FOR ENABLING SAID COMMUTATING MEANS AT SAID SECOND PREDETERMINED INTERVAL, MULTIPLIER MEANS CONNECTED TO SAID DIGITAL IMPULSE GENERATOR MEANS AND SAID DIGITAL STORAGE MEANS FOR PROVIDING THE PRODUCTS OF SAID DIGITALLY STORED AND DIGITALLY GENERATED SIGNALS, CONVERTING MEANS CONNECTED TO SAID MULTIPLIER MEANS FOR PROVIDING AN ANALOG SIGNAL FROM SAID PRODUCTS, WHEREBY SAID DIGITAL FILTER PRODUCES AN OUTPUT SIGNAL CORRESPONDING TO THE CONVOLUTION INTEGRAL OF SAID ANALOG INPUT SIGNAL AND SAID IMPULSE RESPONSE SIGNAL.