JPS5560347A - Automatic level control system for carrier for scpc circuit - Google Patents

Automatic level control system for carrier for scpc circuit

Info

Publication number
JPS5560347A
JPS5560347A JP13239778A JP13239778A JPS5560347A JP S5560347 A JPS5560347 A JP S5560347A JP 13239778 A JP13239778 A JP 13239778A JP 13239778 A JP13239778 A JP 13239778A JP S5560347 A JPS5560347 A JP S5560347A
Authority
JP
Japan
Prior art keywords
carrier
level
channel
signals
existence
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
JP13239778A
Other languages
Japanese (ja)
Inventor
Yasunori Iwafune
Motohiro Shichiri
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
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP13239778A priority Critical patent/JPS5560347A/en
Publication of JPS5560347A publication Critical patent/JPS5560347A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/208—Frequency-division multiple access [FDMA]

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Radio Relay Systems (AREA)

Abstract

PURPOSE:To make an automatic control system for the carrier level of a carrier individual modulation circuit start and stop transmission of a carrier in accordance with the existence of a signal by automatically controlling levels of all carriers by detecting one level of carrier sent out all the time. CONSTITUTION:By using signals 9 and 11 indicating the existence of input signals to channel units 102 and 103, and transmission channel frequency assignment signals 8 and 10, channel selector 112 supplies holding gate signal 13 and transmission channel frequency assignment signal 12 for a channel in use to carrier detector 12. Detector 109 extracts the level of a carrier used constantly and the level is held by a holding circuit to control attenuator 105. Therefore, the transmission of the carrier is stopped and started in accordance with the existence of signals because automatic level control is performed by selecting in-use channel.
JP13239778A 1978-10-27 1978-10-27 Automatic level control system for carrier for scpc circuit Pending JPS5560347A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13239778A JPS5560347A (en) 1978-10-27 1978-10-27 Automatic level control system for carrier for scpc circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13239778A JPS5560347A (en) 1978-10-27 1978-10-27 Automatic level control system for carrier for scpc circuit

Publications (1)

Publication Number Publication Date
JPS5560347A true JPS5560347A (en) 1980-05-07

Family

ID=15080425

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13239778A Pending JPS5560347A (en) 1978-10-27 1978-10-27 Automatic level control system for carrier for scpc circuit

Country Status (1)

Country Link
JP (1) JPS5560347A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5913429A (en) * 1982-07-15 1984-01-24 Nippon Telegr & Teleph Corp <Ntt> Radio communication device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49112516A (en) * 1973-02-23 1974-10-26

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49112516A (en) * 1973-02-23 1974-10-26

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5913429A (en) * 1982-07-15 1984-01-24 Nippon Telegr & Teleph Corp <Ntt> Radio communication device

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