JPS5557172A - Time tone detector circuit - Google Patents

Time tone detector circuit

Info

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
Application number
JP12971178A
Other languages
Japanese (ja)
Inventor
Katsutoshi Amano
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP12971178A priority Critical patent/JPS5557172A/en
Publication of JPS5557172A publication Critical patent/JPS5557172A/en
Pending legal-status Critical Current

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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
JP12971178A 1978-10-20 1978-10-20 Time tone detector circuit Pending JPS5557172A (en)

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)

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