FR2297526A1 - MULTI-FREQUENCY TELEPHONE CALL CIRCUIT - Google Patents

MULTI-FREQUENCY TELEPHONE CALL CIRCUIT

Info

Publication number
FR2297526A1
FR2297526A1 FR7600633A FR7600633A FR2297526A1 FR 2297526 A1 FR2297526 A1 FR 2297526A1 FR 7600633 A FR7600633 A FR 7600633A FR 7600633 A FR7600633 A FR 7600633A FR 2297526 A1 FR2297526 A1 FR 2297526A1
Authority
FR
France
Prior art keywords
telephone call
call circuit
frequency telephone
frequency
circuit
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
FR7600633A
Other languages
French (fr)
Other versions
FR2297526B1 (en
Inventor
John Charles Munday
Andrew Mcdonald
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.)
Arris Technology Inc
Original Assignee
Arris Technology Inc
General Instrument Corp
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 Arris Technology Inc, General Instrument Corp filed Critical Arris Technology Inc
Publication of FR2297526A1 publication Critical patent/FR2297526A1/en
Application granted granted Critical
Publication of FR2297526B1 publication Critical patent/FR2297526B1/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
    • H04M1/50—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
    • 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
    • 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
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
    • H04Q1/4575—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals which are transmitted in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Manipulation Of Pulses (AREA)
FR7600633A 1975-01-10 1976-01-12 MULTI-FREQUENCY TELEPHONE CALL CIRCUIT Granted FR2297526A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB120375A GB1529851A (en) 1975-01-10 1975-01-10 Frequency-signalling circuit for a telephone

Publications (2)

Publication Number Publication Date
FR2297526A1 true FR2297526A1 (en) 1976-08-06
FR2297526B1 FR2297526B1 (en) 1978-05-12

Family

ID=9717956

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7600633A Granted FR2297526A1 (en) 1975-01-10 1976-01-12 MULTI-FREQUENCY TELEPHONE CALL CIRCUIT

Country Status (5)

Country Link
CA (1) CA1031462A (en)
DE (1) DE2600606C2 (en)
FR (1) FR2297526A1 (en)
GB (1) GB1529851A (en)
SE (1) SE416100B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2452823A1 (en) * 1979-03-30 1980-10-24 Texas Instruments France LF signal generator - is esp. for telephone systems and maintains HF stability by using ceramic oscillator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2121627B (en) * 1982-06-02 1986-01-15 Plessey Co Plc Direct digital synthesiser
EP0743144B1 (en) * 1995-05-19 2000-10-11 Matsushita Electric Works, Ltd. Cutter combination for an electric shaver

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7008014A (en) * 1969-06-02 1970-12-04
US3820028A (en) * 1971-08-27 1974-06-25 J Thomas Digital tone signal generator
NL160687C (en) * 1972-06-10 1979-11-15 Philips Nv TONE GENERATOR FOR GENERATING SELECTED FREQUENCIES.
US3787836A (en) * 1972-06-15 1974-01-22 Bell Telephone Labor Inc Multitone telephone dialing circuit employing digital-to-analog tone synthesis

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2452823A1 (en) * 1979-03-30 1980-10-24 Texas Instruments France LF signal generator - is esp. for telephone systems and maintains HF stability by using ceramic oscillator

Also Published As

Publication number Publication date
FR2297526B1 (en) 1978-05-12
SE416100B (en) 1980-11-24
SE7600157L (en) 1976-07-12
CA1031462A (en) 1978-05-16
DE2600606A1 (en) 1976-07-15
DE2600606C2 (en) 1985-06-20
GB1529851A (en) 1978-10-25

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