Switchable frequency tone detector with electronically controlled code plug and bcd converter
作者： Ronald E Poorvin
DOI:
关键词: Detector 、 Signal 、 Code (cryptography) 、 Active filter 、 Tone (musical instrument) 、 Acoustics 、 Spark plug 、 Electronic engineering 、 Sequence signal 、 Computer science
摘要: A switchable frequency tone detector for receiving and passing a plurality of signal frequencies in sequence. The includes an active filter having number switches each operative response to one particular control signals determine the couples therethrough. coupled output operates sequence being thereto develop signal. An electronically controlled code plug is group signals. This converter which couple it switches.
lens.org 参考文章(1)
P Jacobs, J Brocker, J Powell, R Chapman, R Johnson, R Peay, Sequential tone signalling system ,(1972)