JPS6436249A - Carrier synchronizing circuit - Google Patents

Carrier synchronizing circuit

Info

Publication number
JPS6436249A
JPS6436249A JP62192117A JP19211787A JPS6436249A JP S6436249 A JPS6436249 A JP S6436249A JP 62192117 A JP62192117 A JP 62192117A JP 19211787 A JP19211787 A JP 19211787A JP S6436249 A JPS6436249 A JP S6436249A
Authority
JP
Japan
Prior art keywords
signal
carrier
outputted
switch
output
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.)
Granted
Application number
JP62192117A
Other languages
Japanese (ja)
Other versions
JP2590906B2 (en
Inventor
Kazumasa Sato
Yutaka Koizumi
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP62192117A priority Critical patent/JP2590906B2/en
Publication of JPS6436249A publication Critical patent/JPS6436249A/en
Application granted granted Critical
Publication of JP2590906B2 publication Critical patent/JP2590906B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To suppress the production of malfunction of other equipment controlled by an SC signal by detecting asynchronizing state and stopping the output of the SC signal when the synchronization between the carrier of the input signal and the recovered carrier are unlocked and the service channel (SC) signal is disturbed. CONSTITUTION:An input signal (a) subjected to frequency modulation by the SC signal by a carrier subjected to n-value PSK and n-value QAM and a recovered carrier (d) from a VCO 4 are given to a phase detector 1 and the result is outputted as a base band signal (b) by synchronization detection. The signal (b) is fed to an identifier 2, identified by phase information, outputted as a phase information signal and an APC signal controlling the VCO 4 is outputted through an APC signal detection circuit 3 and a loop filter 5. The output signal from the loop filter 5 is also the SC signal, then the signal is outputted via the SC amplifier 6 and a switch 8. In discriminating the output signal from the APC signal detection circuit 3 to be a signal where the carrier in the input signal and the recovered carrier are synchronized, the carrier asynchronizing detection circuit 7 outputs a signal to turn on a switch 8. When the circuit 7 discriminates the output signal to be in the asynchronizing state, the circuit 7 outputs a signal to turn off the switch 8.
JP62192117A 1987-07-31 1987-07-31 Carrier synchronization circuit Expired - Fee Related JP2590906B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62192117A JP2590906B2 (en) 1987-07-31 1987-07-31 Carrier synchronization circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62192117A JP2590906B2 (en) 1987-07-31 1987-07-31 Carrier synchronization circuit

Publications (2)

Publication Number Publication Date
JPS6436249A true JPS6436249A (en) 1989-02-07
JP2590906B2 JP2590906B2 (en) 1997-03-19

Family

ID=16285951

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62192117A Expired - Fee Related JP2590906B2 (en) 1987-07-31 1987-07-31 Carrier synchronization circuit

Country Status (1)

Country Link
JP (1) JP2590906B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08265385A (en) * 1995-03-28 1996-10-11 Fukushima Nippon Denki Kk Doubly modulated signal demodulation circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5168761A (en) * 1974-12-11 1976-06-14 Nippon Electric Co
JPS62105555A (en) * 1985-11-01 1987-05-16 Fujitsu Ltd Carrier synchronizing detecting system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5168761A (en) * 1974-12-11 1976-06-14 Nippon Electric Co
JPS62105555A (en) * 1985-11-01 1987-05-16 Fujitsu Ltd Carrier synchronizing detecting system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08265385A (en) * 1995-03-28 1996-10-11 Fukushima Nippon Denki Kk Doubly modulated signal demodulation circuit

Also Published As

Publication number Publication date
JP2590906B2 (en) 1997-03-19

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees