JPS5567959A - Control signal detection system - Google Patents

Control signal detection system

Info

Publication number
JPS5567959A
JPS5567959A JP14196078A JP14196078A JPS5567959A JP S5567959 A JPS5567959 A JP S5567959A JP 14196078 A JP14196078 A JP 14196078A JP 14196078 A JP14196078 A JP 14196078A JP S5567959 A JPS5567959 A JP S5567959A
Authority
JP
Japan
Prior art keywords
control signal
pulse
circuit
detection
gate
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
JP14196078A
Other languages
Japanese (ja)
Inventor
Shigeru Yamazaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP14196078A priority Critical patent/JPS5567959A/en
Publication of JPS5567959A publication Critical patent/JPS5567959A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To detect definitely an automatic stop control signal, etc., existing by detecting the existence of a control signal formed of signals mutually differing in frequency, by counting changes in frequency of the control signal to a fixed number.
CONSTITUTION: Detector 5 equipped with band-erasing circuit 11, rectifying integral waveform forming circuit 12, inverter 13, BFP15, rectifying integrating circuit 16, AND gate 14, etc., generates a detection pulse of width equivalent to the existence period of signal (f1) of the control signal formed of mutually-different frequencies (f1) and (f2) without being influence by noises. In response to this pulse, the monostable multivibator of input-change detection circuit 7 generates a pulse of a little bit wider width to open AND gate H. On the othe hand, a pulse outputted at the time of a change between signals (f1) and (f2) outputted by gate 24 applied with a detection pulse of signal (f2) from similar detection circuit 6 is counted by counter 8. When this count value reaches a fixed value, an existence detection signal of the control signal is generated through monostable multivibrator 9.
COPYRIGHT: (C)1980,JPO&Japio
JP14196078A 1978-11-17 1978-11-17 Control signal detection system Pending JPS5567959A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14196078A JPS5567959A (en) 1978-11-17 1978-11-17 Control signal detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14196078A JPS5567959A (en) 1978-11-17 1978-11-17 Control signal detection system

Publications (1)

Publication Number Publication Date
JPS5567959A true JPS5567959A (en) 1980-05-22

Family

ID=15304119

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14196078A Pending JPS5567959A (en) 1978-11-17 1978-11-17 Control signal detection system

Country Status (1)

Country Link
JP (1) JPS5567959A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4845577A (en) * 1987-05-11 1989-07-04 Exabyte Corporation Apparatus and method for enabling rapid searching of helically recorded magnetic tape

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4845577A (en) * 1987-05-11 1989-07-04 Exabyte Corporation Apparatus and method for enabling rapid searching of helically recorded magnetic tape

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