FR2397111A1 - Telephone keyboard integrated circuit operation during dialling - is enabled by relay which shunts listening and bell circuits - Google Patents

Telephone keyboard integrated circuit operation during dialling - is enabled by relay which shunts listening and bell circuits

Info

Publication number
FR2397111A1
FR2397111A1 FR7720441A FR7720441A FR2397111A1 FR 2397111 A1 FR2397111 A1 FR 2397111A1 FR 7720441 A FR7720441 A FR 7720441A FR 7720441 A FR7720441 A FR 7720441A FR 2397111 A1 FR2397111 A1 FR 2397111A1
Authority
FR
France
Prior art keywords
relay
dialling
integrated circuit
listening
shunts
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
FR7720441A
Other languages
French (fr)
Other versions
FR2397111B1 (en
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.)
MARDESSON PIERRE
Original Assignee
MARDESSON PIERRE
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 MARDESSON PIERRE filed Critical MARDESSON PIERRE
Priority to FR7720441A priority Critical patent/FR2397111A1/en
Publication of FR2397111A1 publication Critical patent/FR2397111A1/en
Application granted granted Critical
Publication of FR2397111B1 publication Critical patent/FR2397111B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

An electronic electromagnetic circuit allows the modulation and calling circuit to be switched off during dialling process from the telephone keyboard dial. this allows the specialised integrated circuit to continue operating during reduction of line current during dialling. Operation of dialling key causes output from integrated circuit (SN1) to cause transistor (T1) to conduct. A capacitor (C7) charges through bistable relay coil (RL) and relay shunts listening and bell circuits. When dialling ceases transistor becomes non conducting while another transistor (T7) becomes saturated and causes capacitor to discharge. The relay then operates in opposite direction to open contacts for conversation.
FR7720441A 1977-07-04 1977-07-04 Telephone keyboard integrated circuit operation during dialling - is enabled by relay which shunts listening and bell circuits Granted FR2397111A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7720441A FR2397111A1 (en) 1977-07-04 1977-07-04 Telephone keyboard integrated circuit operation during dialling - is enabled by relay which shunts listening and bell circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7720441A FR2397111A1 (en) 1977-07-04 1977-07-04 Telephone keyboard integrated circuit operation during dialling - is enabled by relay which shunts listening and bell circuits

Publications (2)

Publication Number Publication Date
FR2397111A1 true FR2397111A1 (en) 1979-02-02
FR2397111B1 FR2397111B1 (en) 1980-02-29

Family

ID=9192923

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7720441A Granted FR2397111A1 (en) 1977-07-04 1977-07-04 Telephone keyboard integrated circuit operation during dialling - is enabled by relay which shunts listening and bell circuits

Country Status (1)

Country Link
FR (1) FR2397111A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004901A2 (en) * 1978-04-14 1979-10-31 Siemens Aktiengesellschaft Circuit for subscriber stations with selecting means and current supply over the lines in telecommunication systems, especially telephone systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004901A2 (en) * 1978-04-14 1979-10-31 Siemens Aktiengesellschaft Circuit for subscriber stations with selecting means and current supply over the lines in telecommunication systems, especially telephone systems
EP0004901A3 (en) * 1978-04-14 1979-11-14 Siemens Aktiengesellschaft Berlin Und Munchen Circuit for subscriber stations with selecting means and current supply over the lines in telecommunication systems, especially telephone systems

Also Published As

Publication number Publication date
FR2397111B1 (en) 1980-02-29

Similar Documents

Publication Publication Date Title
FR2397111A1 (en) Telephone keyboard integrated circuit operation during dialling - is enabled by relay which shunts listening and bell circuits
JP3407622B2 (en) Power supply device for plug
GB1091576A (en) Voice-frequency key-dialling circuit arrangement for telecommunication,particularly telephone exchanges
JPS5613866A (en) Communication device
GB1452254A (en) Circuit arrangement for a tone pushbutton selection telephone subscriber set
SU440805A1 (en) Device for paired activation of telephone and telegraph apparatus
JPS5671344A (en) Car telephone with speaker
JPS5733843A (en) Echo cancelling device
KR830000557Y1 (en) Click sound attenuation circuit of MFC dial
GB1041329A (en) An intrinsic safety telephone device
JPS5644257A (en) Telephone set
JPS5531381A (en) Interphone device
SU1131039A1 (en) Device for sending telephone number signal
JPS57173251A (en) Voice switch circuit
KR910002633B1 (en) Telephone power supply system in case of turning off power
GB1142400A (en) Improvements in or relating to circuit arrangements for electric relays
SU1202072A1 (en) Card checking device for coin-box telephones
SU860350A2 (en) Call device
KR0184495B1 (en) Door lock release
SU1480148A1 (en) Subscriber unit using the four-wire line
JPS551793A (en) Automatic response unit for automatic answering telephone
JPS56112194A (en) Omnibus circuit device
SU758561A2 (en) Automatic desk telephone set
JPS5787268A (en) Telephone system
JPS5462716A (en) Privacy telephone circuit for radio telephone set

Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse