JPS6468083A - Signal discriminating device - Google Patents

Signal discriminating device

Info

Publication number
JPS6468083A
JPS6468083A JP62223903A JP22390387A JPS6468083A JP S6468083 A JPS6468083 A JP S6468083A JP 62223903 A JP62223903 A JP 62223903A JP 22390387 A JP22390387 A JP 22390387A JP S6468083 A JPS6468083 A JP S6468083A
Authority
JP
Japan
Prior art keywords
amplitude
signal
agc
constant
range
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP62223903A
Inventor
Eiji Moro
Hitoshi Akamine
Hiroyuki Torii
Kuniaki Miura
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP62223903A priority Critical patent/JPS6468083A/en
Publication of JPS6468083A publication Critical patent/JPS6468083A/en
Application status is Pending legal-status Critical

Links

Abstract

PURPOSE:To execute a correct discriminating action in the amplitude dispersion range of a reproducing FM signal by inputting the reproducing FM signal to an automatic gain adjusting circuit (AGC circuit) and inputting an AGC circuit output whose amplitude is made constant by an AGC action to a signal discriminating device. CONSTITUTION:AGC circuits 2 and 3 changes an amplifier 5 gain automatically so that an output amplitude becomes constant. That is, when an input signal amplitude is small, an amplifier gain becomes large, when the input signal amplitude is large, the amplifier gain becomes small and thus, a constant output amplitude can be held over a wide input signal amplitude range. Consequently, the input signal range is the one in which an AGC output amplitude is more constant compared with the dispersion range of the reproducing FM signal. By setting an AGC input dynamic range large, the input signal amplitude of a signal discriminating device 4 becomes an FM signal which does not get under a dispersion influence and has an almost constant amplitude. By setting this to an amplitude suitable for a signal discrimination, a discrimination false action by the amplitude dispersion of the reproducing FM signal can be prevented.
JP62223903A 1987-09-09 1987-09-09 Signal discriminating device Pending JPS6468083A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62223903A JPS6468083A (en) 1987-09-09 1987-09-09 Signal discriminating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62223903A JPS6468083A (en) 1987-09-09 1987-09-09 Signal discriminating device

Publications (1)

Publication Number Publication Date
JPS6468083A true JPS6468083A (en) 1989-03-14

Family

ID=16805514

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62223903A Pending JPS6468083A (en) 1987-09-09 1987-09-09 Signal discriminating device

Country Status (1)

Country Link
JP (1) JPS6468083A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5131340A (en) * 1989-06-09 1992-07-21 Tokai Kogyo Mishin Kabushiki Kaisha Selective thread cutting device in a sewing machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5131340A (en) * 1989-06-09 1992-07-21 Tokai Kogyo Mishin Kabushiki Kaisha Selective thread cutting device in a sewing machine

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