JPS5710538A - Telephone terminal device for power line carrier - Google Patents

Telephone terminal device for power line carrier

Info

Publication number
JPS5710538A
JPS5710538A JP8437080A JP8437080A JPS5710538A JP S5710538 A JPS5710538 A JP S5710538A JP 8437080 A JP8437080 A JP 8437080A JP 8437080 A JP8437080 A JP 8437080A JP S5710538 A JPS5710538 A JP S5710538A
Authority
JP
Japan
Prior art keywords
voltage
signal
frequency
linger
band
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
JP8437080A
Other languages
Japanese (ja)
Other versions
JPS6364929B2 (en
Inventor
Kenji Kobayashi
Toshiyuki Taguchi
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 JP8437080A priority Critical patent/JPS5710538A/en
Publication of JPS5710538A publication Critical patent/JPS5710538A/en
Publication of JPS6364929B2 publication Critical patent/JPS6364929B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/68—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for wholly or partially suppressing the carrier or one side band

Abstract

PURPOSE:To narrower the transmission band and to make effective use of the band, by controlling the level of the reception signal and the oscillation frequency of a voltage-controlled crystal oscillator through the reception linger signal. CONSTITUTION:A frequency shifting system linger signal including a control signal for measurement and data signal as well as a communication current voice current in a voice band is transmitted by a carrier suppression single side band system, and the linger signal is converted into a voltage corresponding to the difference from the reference frequency by a frequency discriminator 24. This voltage is compared with a reference voltage at a comparator circuit 25, and the output voltage of the circuit 25 is taken as a negative or positive reference voltage corresponding to the polarity to the reference voltage. The output voltage of the comparator 25 and that of the frequency discrimination circuit 24 are added via resistances R1, R2, and applied to a voltage-controlled crystal oscillator via a voltage amplifier 26 to control the oscillation frequency. The amplifier 26 produces a control voltage corresponding to the shift from the carrier frequency of the linger signal. As a result, a synchronizing pilot signal is made unnecessary.
JP8437080A 1980-06-20 1980-06-20 Telephone terminal device for power line carrier Granted JPS5710538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8437080A JPS5710538A (en) 1980-06-20 1980-06-20 Telephone terminal device for power line carrier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8437080A JPS5710538A (en) 1980-06-20 1980-06-20 Telephone terminal device for power line carrier

Publications (2)

Publication Number Publication Date
JPS5710538A true JPS5710538A (en) 1982-01-20
JPS6364929B2 JPS6364929B2 (en) 1988-12-14

Family

ID=13828636

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8437080A Granted JPS5710538A (en) 1980-06-20 1980-06-20 Telephone terminal device for power line carrier

Country Status (1)

Country Link
JP (1) JPS5710538A (en)

Also Published As

Publication number Publication date
JPS6364929B2 (en) 1988-12-14

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