FR2368843A1 - Multi-frequency signal generator for telephone - has switching circuit and summing circuit to provide dialling signals - Google Patents

Multi-frequency signal generator for telephone - has switching circuit and summing circuit to provide dialling signals

Info

Publication number
FR2368843A1
FR2368843A1 FR7631827A FR7631827A FR2368843A1 FR 2368843 A1 FR2368843 A1 FR 2368843A1 FR 7631827 A FR7631827 A FR 7631827A FR 7631827 A FR7631827 A FR 7631827A FR 2368843 A1 FR2368843 A1 FR 2368843A1
Authority
FR
France
Prior art keywords
signals
circuit
summing
telephone
signal generator
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
FR7631827A
Other languages
French (fr)
Other versions
FR2368843B1 (en
Inventor
Xavier Chaveron
Pierre Boiteux
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.)
Constr Telephoniques
Original Assignee
Constr Telephoniques
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 Constr Telephoniques filed Critical Constr Telephoniques
Priority to FR7631827A priority Critical patent/FR2368843A1/en
Publication of FR2368843A1 publication Critical patent/FR2368843A1/en
Application granted granted Critical
Publication of FR2368843B1 publication Critical patent/FR2368843B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
    • 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
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • H04M1/505—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies signals generated in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Meter Arrangements (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

A multifrequency signal generator can provide a signal made up of the sum of sinusoidal signals with different frequencies. It is used to transmit dialling signals between two telephone exchanges. The generator has a switching circuit (CC) and a summing and filtering circuit (SF). The circuit receives up to seven rectangular signals (FE1,...,FE7) with separate frequency for each. The signals (FE1,...,FE7) are taken to seven gates (NB1,...NB7). Each gate (NB1,...,NB7) also receives a control signal from a switch (CD1,...,CD7) and supplies two signals (ON1, OB1; ....: ON7, OB7) to the summing and filtering circuit (SF). The summing and filtering circuit (SF) produces the summed frequencies signal (FS).
FR7631827A 1976-10-22 1976-10-22 Multi-frequency signal generator for telephone - has switching circuit and summing circuit to provide dialling signals Granted FR2368843A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7631827A FR2368843A1 (en) 1976-10-22 1976-10-22 Multi-frequency signal generator for telephone - has switching circuit and summing circuit to provide dialling signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7631827A FR2368843A1 (en) 1976-10-22 1976-10-22 Multi-frequency signal generator for telephone - has switching circuit and summing circuit to provide dialling signals

Publications (2)

Publication Number Publication Date
FR2368843A1 true FR2368843A1 (en) 1978-05-19
FR2368843B1 FR2368843B1 (en) 1982-07-23

Family

ID=9179084

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7631827A Granted FR2368843A1 (en) 1976-10-22 1976-10-22 Multi-frequency signal generator for telephone - has switching circuit and summing circuit to provide dialling signals

Country Status (1)

Country Link
FR (1) FR2368843A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0122680A1 (en) * 1983-04-19 1984-10-24 Koninklijke Philips Electronics N.V. Transmission circuit for a DTMF telephone set
EP0147791A3 (en) * 1983-12-26 1988-07-13 Kabushiki Kaisha Toshiba Dual-tone multiple-frequency-signal generating apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946164A (en) * 1974-05-28 1976-03-23 Gte Automatic Electric Laboratories Incorporated Precise tone signal generator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946164A (en) * 1974-05-28 1976-03-23 Gte Automatic Electric Laboratories Incorporated Precise tone signal generator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0122680A1 (en) * 1983-04-19 1984-10-24 Koninklijke Philips Electronics N.V. Transmission circuit for a DTMF telephone set
FR2544938A1 (en) * 1983-04-19 1984-10-26 Philips Nv TRANSMISSION CIRCUIT FOR DTMF TELEPHONE DEVICE
EP0147791A3 (en) * 1983-12-26 1988-07-13 Kabushiki Kaisha Toshiba Dual-tone multiple-frequency-signal generating apparatus

Also Published As

Publication number Publication date
FR2368843B1 (en) 1982-07-23

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Legal Events

Date Code Title Description
TP Transmission of property