Multifrequency signal detector
Abstract
Abstract A MULTIFREQUENCY SIGNAL DETECTOR TO SELECTIVELY DISTINGUISH SIGNALS OF DIFFERENT PREDETERMINED FREQUENCIES. THE INPUT SIGNAL TO THE DETECTOR IS APPLIED TO AN OPERATIONAL AMPLIFIER, THE OUTPUT OF WHICH COMMONLY FEEDS A PLURALITY OF FILTER-AMPLIFIER MEANS CORRESPONDING IN NUMBER TO THAT OF THE DIFFERENT FREQUENCIES TO BE SELECTIVELY DISTINGUISHED. A PEAK VOLTAGE OUTPUT IS PRODUCED BY THAT FILTER-AMPLIFIER MEANS WHICH RECEIVES SIGNALS OF TGHE FREQUENCY SELECTED TO BE DETECTED. FEEDBACK MEANS INCLUDING A VOLTAGE FOLLOWER ARE CONNECTED BETWEEN THE OUTPUTS OF THE FILTER-AMPLIFIER MEANS AND THE OPERATIONAL AMPLIFIER. SWITCH MEANS THAT MAY COMPRISE TRANSISTORS ARE ALSO CONNECTED TO THE OUTPUTS OF THE FILTER-AMPLIFIER MEANS TO INDICATE RECEPTION OF FREQUENCIES SELECTED TO BE DETECTED.
Inventors
- 👤 Robert E Vosteen
Bibliographic Details
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