Circuit arrangement for the acquisition of chirp-modulated signals, especially for the acquisition of chirp-modulated ultrasonic signals

摘要

Circuitry for detecting chirped signals having at least two counters, an oscillator and a chain of gates and clocked shift registers. This includes a digital frequency discriminator, through which the Fre the comments received chirped signals quenzänderungen be captured and digitized, the digital output signals of the frequency discriminator a sequential pulse detector consists of a chain of OR gates (75) and from the oscillator (36) (by counter 40) clocked shift registers (70) are supplied, in which these signals aufeinan temporally summed derfolgend, so that the digital frequency discriminator (2) and the sequential pulse detector (70, 75) form a matched to the chirped signals filter, after reaching a predetermined threshold value of at least one of a plurality of Schwellwertschaltun gen (80) to a priority decoder (90), an output signal is outputted and the priority decoder (90), the frequency and timing of the comments received chirped signal is determined, whereby this predetermined in a Frequen z whereupon the output signal of the priority decoder (90) to a display signal is outputted to a memory or is determined and evaluated area correlatively.