JPS6449457A - Carrier detecting system - Google Patents

Carrier detecting system

Info

Publication number
JPS6449457A
JPS6449457A JP20710787A JP20710787A JPS6449457A JP S6449457 A JPS6449457 A JP S6449457A JP 20710787 A JP20710787 A JP 20710787A JP 20710787 A JP20710787 A JP 20710787A JP S6449457 A JPS6449457 A JP S6449457A
Authority
JP
Japan
Prior art keywords
signal
carrier
holding
carrier detecting
clock means
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
JP20710787A
Other languages
Japanese (ja)
Inventor
Keizou Kanaguri
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP20710787A priority Critical patent/JPS6449457A/en
Publication of JPS6449457A publication Critical patent/JPS6449457A/en
Pending legal-status Critical Current

Links

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To reduce influence due to a reception signal level and to prevent erroneous detection from being performed, by providing a carrier detecting means and first and second clock means, holding a signal by the output of the first clock means, and releasing the holding of the signal by the output of the second clock means. CONSTITUTION:The carrier detecting means 111 detects carrier input from the outside, and after a prescribed time, the first clock means 131 outputs a carrier detecting signal 133, and the signal 133 is held by a signal holding means 171. The carrier detecting means 111 detects the cut-off of the carrier input, and after the prescribed time, the second clock means 151 outputs a carrier cut-off signal 153, and the signal holding means 171 cancels the holding of the carrier detecting signal 133 by the signal 153. By constituting a system in such way, it is possible to suppress the influence due to the reception signal level and to prevent the erroneous detection due to a noise, etc., from being generated.
JP20710787A 1987-08-20 1987-08-20 Carrier detecting system Pending JPS6449457A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20710787A JPS6449457A (en) 1987-08-20 1987-08-20 Carrier detecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20710787A JPS6449457A (en) 1987-08-20 1987-08-20 Carrier detecting system

Publications (1)

Publication Number Publication Date
JPS6449457A true JPS6449457A (en) 1989-02-23

Family

ID=16534316

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20710787A Pending JPS6449457A (en) 1987-08-20 1987-08-20 Carrier detecting system

Country Status (1)

Country Link
JP (1) JPS6449457A (en)

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