FR2452823A1 - Generateur de signaux a basse frequence, notamment de signaux de tonalite pour communications telephoniques - Google Patents

Generateur de signaux a basse frequence, notamment de signaux de tonalite pour communications telephoniques

Info

Publication number
FR2452823A1
FR2452823A1 FR7908050A FR7908050A FR2452823A1 FR 2452823 A1 FR2452823 A1 FR 2452823A1 FR 7908050 A FR7908050 A FR 7908050A FR 7908050 A FR7908050 A FR 7908050A FR 2452823 A1 FR2452823 A1 FR 2452823A1
Authority
FR
France
Prior art keywords
esp
frequency
signal generator
outputs
oscillator
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
FR7908050A
Other languages
English (en)
Other versions
FR2452823B1 (fr
Inventor
Giuseppe Savarese
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.)
Texas Instruments France SAS
Original Assignee
Texas Instruments France SAS
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 Texas Instruments France SAS filed Critical Texas Instruments France SAS
Priority to FR7908050A priority Critical patent/FR2452823A1/fr
Publication of FR2452823A1 publication Critical patent/FR2452823A1/fr
Application granted granted Critical
Publication of FR2452823B1 publication Critical patent/FR2452823B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/02—Generating pulses having essentially a finite slope or stepped portions having stepped portions, e.g. staircase waveform
    • H03K4/026—Generating pulses having essentially a finite slope or stepped portions having stepped portions, e.g. staircase waveform using digital techniques
    • 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

Abstract

CE GENERATEUR COMPREND UN OSCILLATEUR A CERAMIQUE 1 COMMANDE PAR UN CLAVIER A TOUCHES 4 ET UN DECODEUR 5, DEUX BLOCS DE FREQUENCE 2 ET 3 DESTINES A ENGENDRER CHACUN QUATRE FREQUENCES DIFFERENTES D'IDENTIFICATION DES TOUCHES DU CLAVIER 4, CHAQUE BLOC DE FREQUENCE COMPORTANT UN DIVISEUR 6 PROGRAMMABLE PAR LEDIT CLAVIER, UN REGISTRE A DECALAGE 8, DES TRANSISTORS T A T DE SOMMATION DES SORTIES DU REGISTRE A DECALAGE ET UN MULTIPLEXEUR INTERPOSE ENTRE LE REGISTRE ET LES TRANSISTORS. LE DIVISEUR PROGRAMMABLE COMPREND DES MOYENS POUR DIVISER LA FREQUENCE DE L'OSCILLATEUR A CERAMIQUE PAR DES NOMBRES ENTIERS ET DES MOYENS POUR DIVISER CETTE FREQUENCE PAR AU MOINS UN NOMBRE NON ENTIER.
FR7908050A 1979-03-30 1979-03-30 Generateur de signaux a basse frequence, notamment de signaux de tonalite pour communications telephoniques Granted FR2452823A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7908050A FR2452823A1 (fr) 1979-03-30 1979-03-30 Generateur de signaux a basse frequence, notamment de signaux de tonalite pour communications telephoniques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7908050A FR2452823A1 (fr) 1979-03-30 1979-03-30 Generateur de signaux a basse frequence, notamment de signaux de tonalite pour communications telephoniques

Publications (2)

Publication Number Publication Date
FR2452823A1 true FR2452823A1 (fr) 1980-10-24
FR2452823B1 FR2452823B1 (fr) 1982-11-19

Family

ID=9223763

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7908050A Granted FR2452823A1 (fr) 1979-03-30 1979-03-30 Generateur de signaux a basse frequence, notamment de signaux de tonalite pour communications telephoniques

Country Status (1)

Country Link
FR (1) FR2452823A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0147791A3 (en) * 1983-12-26 1988-07-13 Kabushiki Kaisha Toshiba Dual-tone multiple-frequency-signal generating apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2188360A1 (fr) * 1972-06-10 1974-01-18 Philips Nv
US3787836A (en) * 1972-06-15 1974-01-22 Bell Telephone Labor Inc Multitone telephone dialing circuit employing digital-to-analog tone synthesis
FR2297526A1 (fr) * 1975-01-10 1976-08-06 Gen Instrument Corp Circuit d'appel telephonique a frequences multiples
FR2336831A1 (fr) * 1975-12-24 1977-07-22 Texas Instruments France Generateur de signaux a basse frequence, notamment de signaux de tonalite

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2188360A1 (fr) * 1972-06-10 1974-01-18 Philips Nv
US3787836A (en) * 1972-06-15 1974-01-22 Bell Telephone Labor Inc Multitone telephone dialing circuit employing digital-to-analog tone synthesis
FR2297526A1 (fr) * 1975-01-10 1976-08-06 Gen Instrument Corp Circuit d'appel telephonique a frequences multiples
FR2336831A1 (fr) * 1975-12-24 1977-07-22 Texas Instruments France Generateur de signaux a basse frequence, notamment de signaux de tonalite

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2452823B1 (fr) 1982-11-19

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Legal Events

Date Code Title Description
ST Notification of lapse
AR Application made for restoration
BR Restoration of rights