JPS54103615A - Demodulating and modulating device - Google Patents

Demodulating and modulating device

Info

Publication number
JPS54103615A
JPS54103615A JP926478A JP926478A JPS54103615A JP S54103615 A JPS54103615 A JP S54103615A JP 926478 A JP926478 A JP 926478A JP 926478 A JP926478 A JP 926478A JP S54103615 A JPS54103615 A JP S54103615A
Authority
JP
Japan
Prior art keywords
voltage
power supply
circuit
capacitor
supplied
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
JP926478A
Other languages
Japanese (ja)
Inventor
Haruo Masuo
Shizuo Sugiyama
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.)
Hitachi Denshi KK
Hitachi Ltd
Original Assignee
Hitachi Denshi KK
Hitachi 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 Hitachi Denshi KK, Hitachi Ltd filed Critical Hitachi Denshi KK
Priority to JP926478A priority Critical patent/JPS54103615A/en
Publication of JPS54103615A publication Critical patent/JPS54103615A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To prevent unnecessary carriers from being transmitted by an excessive noise generated from a modulating circuit when turning on and off the A/C power supply by the modulating device to which the operating voltage is supplied from a terminal device.
CONSTITUTION: When A/C power supply AC of terminal device 5 is connected, D/C voltage +B1, +B2 and -B3 rises with a particular characteristics in D/C power supply circuirt. Under this condition, when capacitor 18 of integration circuit in voltage detection circuit 13 is charged at the time constant determined by resistor 17 and capacitor 18 and integral voltage +B7 starts rising. Integral voltage +B7 reaches the threshold level of inverter 20 when the specified time has elapsed after A/C power supply A is turned on and detection output +B8 changes at a high level. Consequently, operating voltages +B4 and -B5 are supplied from voltage control circuit 14 to transmission circuit 2. When power supply AC is shut-off and DC voltage +B1 starts dropping, the electric charge of capacitor 18 is rapidly discharged through diode 19 and integration voltage +B7 drops lower than the threshold value.
COPYRIGHT: (C)1979,JPO&Japio
JP926478A 1978-02-01 1978-02-01 Demodulating and modulating device Pending JPS54103615A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP926478A JPS54103615A (en) 1978-02-01 1978-02-01 Demodulating and modulating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP926478A JPS54103615A (en) 1978-02-01 1978-02-01 Demodulating and modulating device

Publications (1)

Publication Number Publication Date
JPS54103615A true JPS54103615A (en) 1979-08-15

Family

ID=11715568

Family Applications (1)

Application Number Title Priority Date Filing Date
JP926478A Pending JPS54103615A (en) 1978-02-01 1978-02-01 Demodulating and modulating device

Country Status (1)

Country Link
JP (1) JPS54103615A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100355977B1 (en) * 1994-11-21 2002-12-16 소니 가부시끼 가이샤 Method and Apparatus for Transmitting an Intermittent Signal in a Radio Communication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS484008U (en) * 1971-05-24 1973-01-18
JPS4860809A (en) * 1971-11-29 1973-08-25

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS484008U (en) * 1971-05-24 1973-01-18
JPS4860809A (en) * 1971-11-29 1973-08-25

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100355977B1 (en) * 1994-11-21 2002-12-16 소니 가부시끼 가이샤 Method and Apparatus for Transmitting an Intermittent Signal in a Radio Communication

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