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JPS5587080A - Time casting detector - Google Patents

Time casting detector

Info

Publication number
JPS5587080A
JPS5587080A JP15844778A JP15844778A JPS5587080A JP S5587080 A JPS5587080 A JP S5587080A JP 15844778 A JP15844778 A JP 15844778A JP 15844778 A JP15844778 A JP 15844778A JP S5587080 A JPS5587080 A JP S5587080A
Authority
JP
Japan
Prior art keywords
circuit
received
time casting
time
noise
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
JP15844778A
Other languages
Japanese (ja)
Inventor
Nobuo Toyama
Junichi Yoshida
Shozo Yamano
Kenji Kamiya
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 Elemex Corp
Ricoh Co Ltd
Original Assignee
Ricoh Elemex Corp
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 Elemex Corp, Ricoh Co Ltd filed Critical Ricoh Elemex Corp
Priority to JP15844778A priority Critical patent/JPS5587080A/en
Publication of JPS5587080A publication Critical patent/JPS5587080A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To prevent the mis-correction due to noise, by discriminating the magnitude of received audio signal before the detection operation of received time casting signal and automatically adjusting the threshold value of peak discrimination circuit producing the pulse in response to the received time casting signal.
CONSTITUTION: When the content of the counter of the watch circuit 7 is e.g., 6:59'30", the AND gate is opened. When the received input sound pressure is greater, the audio signal with attenuation such as 500Hz other than 400Hz time casting predict tone through BPF3 via the amplifier 2 triggers the peak discrimination circuit 4, the output pulse of the circuit 4 is counted at the counter CUNT, and the counter CUNT produces a given value of arrival signal before the time casting tone is received. Thus, the switches SW1, SW2 are selected, the threshold value of the circuit 4 is automatically greater with the resistor R2 corresponded, the circuit 4 is not triggered with noise, and miscorrection of time due to the time casting signal discriminating circuit 5 and time correction circuit 6 by noise can not be made. Further, it is the same with the adjustment of the gain of the amplifier 2.
COPYRIGHT: (C)1980,JPO&Japio
JP15844778A 1978-12-25 1978-12-25 Time casting detector Pending JPS5587080A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15844778A JPS5587080A (en) 1978-12-25 1978-12-25 Time casting detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15844778A JPS5587080A (en) 1978-12-25 1978-12-25 Time casting detector

Publications (1)

Publication Number Publication Date
JPS5587080A true JPS5587080A (en) 1980-07-01

Family

ID=15671951

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15844778A Pending JPS5587080A (en) 1978-12-25 1978-12-25 Time casting detector

Country Status (1)

Country Link
JP (1) JPS5587080A (en)

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