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32. 发明专利

JPS57208465A DISCRIMINATING CIRCUIT FOR FREQUENCY 失效
公开(公告)号：JPS57208465A
公开(公告)日：1982-12-21
申请号：JP9444781
申请日：1981-06-18
申请人： PIONEER ELECTRONIC CORP
发明人： MATSUDA KOUICHI
IPC分类号： G01R23/08 , G01R23/165 , H03D3/00 , H03J9/00
摘要： PURPOSE:To prevent the occurence of a malfunction, by a method wherein, by means of an input signal of one comparator of a plural number of comparators mounted corresponding to a plural number of signals being different in frequency, reference levels of other comparators are controlled. CONSTITUTION:After an input signal IN is supplied to active filters 5 and 6 for selection and amplification, it is applied to comparators 7 and 8 and a non- inversion terminal via rectifying circuits 3 and 4 together with an output of a reference level set circuit 9. A signal of a frequency fA is then inputted, and when the output of the rectifying circuit 3 rises higher than the reference level of the comparator 7, the output of the comparator 7 inverts, and simultaneously, raises the reference level of the comparator 8 via a resistance R3, which results in preventing the comparator 8 from inverting even if the rectifying circuit 4 is increased in the output to a certain degree. This permits a malfunction to be preventd from occurring even if a difference in frequency between plural number of signals is narrow and a selectivity property of a filter is broad.

34. 发明专利

JPS5418947B2 失效
公开(公告)号：JPS5418947B2
公开(公告)日：1979-07-11
申请号：JP11240472
申请日：1972-11-09
IPC分类号： G01F1/32 , G01R23/02 , G01R23/08 , G08C25/00 , H03G5/16 , H03H7/06 , H03H11/04

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