JPS5567959A - Control signal detection system - Google Patents
Control signal detection systemInfo
- 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
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
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)
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 |
-
1978
- 1978-11-17 JP JP14196078A patent/JPS5567959A/en active Pending
Cited By (1)
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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