JPS5557172A - Time tone detector circuit - Google Patents
Time tone detector circuitInfo
- Publication number
- JPS5557172A JPS5557172A JP12971178A JP12971178A JPS5557172A JP S5557172 A JPS5557172 A JP S5557172A JP 12971178 A JP12971178 A JP 12971178A JP 12971178 A JP12971178 A JP 12971178A JP S5557172 A JPS5557172 A JP S5557172A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- terminal
- counter
- time
- time tone
- 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
Landscapes
- Electromechanical Clocks (AREA)
Abstract
PURPOSE: To secure an assured isolation for the time tone signals through the stable action by changing the reception signal into the pulse and then counting the pulses passes through the digital filter possessing the frequency pass band for the time tone signals.
CONSTITUTION: The signal tone of 880Hz continuing 0.5 seconds is decided as the time tone. Then the detection output of the receiver applied to terminal 10 and featuring the level higher than the prescribed value is cut off at limiter circuit 11 and then changed into the pulse through waveform shaping circuit 12 to be applied to digital filter 13 which transmits only the signal of 880Hz. The pulse row signals passed through filter 13 are applied to counter 14 and error signal decision circuit 15. Counter 14 delivers the signal of "1" through terminal Q440 when counting the pulse row signals for 0.5 seconds, i.e., 440 units of the signal. While circuit 15 resets counter 14 when counter 14 applies the pulses in the time shortrer than 0.5 seconds. The output signal of terminal Q440 triggers mono-multi 20 and also gives the output to AND19 to deliver the time tone detection signal through terminal 21. In such way, the time tone signal can be isolated in an assured and safe way.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12971178A JPS5557172A (en) | 1978-10-20 | 1978-10-20 | Time tone detector circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12971178A JPS5557172A (en) | 1978-10-20 | 1978-10-20 | Time tone detector circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5557172A true JPS5557172A (en) | 1980-04-26 |
Family
ID=15016307
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12971178A Pending JPS5557172A (en) | 1978-10-20 | 1978-10-20 | Time tone detector circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5557172A (en) |
-
1978
- 1978-10-20 JP JP12971178A patent/JPS5557172A/en active Pending
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