CA1031462A - Frequency-signalling circuit for a telephone - Google Patents

Frequency-signalling circuit for a telephone

Info

Publication number
CA1031462A
CA1031462A CA243,288A CA243288A CA1031462A CA 1031462 A CA1031462 A CA 1031462A CA 243288 A CA243288 A CA 243288A CA 1031462 A CA1031462 A CA 1031462A
Authority
CA
Canada
Prior art keywords
telephone
frequency
signalling circuit
signalling
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.)
Expired
Application number
CA243,288A
Other languages
English (en)
French (fr)
Inventor
John C. 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
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 General Instrument Corp filed Critical General Instrument Corp
Application granted granted Critical
Publication of CA1031462A publication Critical patent/CA1031462A/en
Expired 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)
  • Manipulation Of Pulses (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
CA243,288A 1975-01-10 1976-01-09 Frequency-signalling circuit for a telephone Expired CA1031462A (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 (1)

Publication Number Publication Date
CA1031462A true CA1031462A (en) 1978-05-16

Family

ID=9717956

Family Applications (1)

Application Number Title Priority Date Filing Date
CA243,288A Expired CA1031462A (en) 1975-01-10 1976-01-09 Frequency-signalling circuit for a telephone

Country Status (5)

Country Link
CA (1) CA1031462A (cg-RX-API-DMAC10.html)
DE (1) DE2600606C2 (cg-RX-API-DMAC10.html)
FR (1) FR2297526A1 (cg-RX-API-DMAC10.html)
GB (1) GB1529851A (cg-RX-API-DMAC10.html)
SE (1) SE416100B (cg-RX-API-DMAC10.html)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2452823A1 (fr) * 1979-03-30 1980-10-24 Texas Instruments France Generateur de signaux a basse frequence, notamment de signaux de tonalite pour communications telephoniques
GB2121627B (en) * 1982-06-02 1986-01-15 Plessey Co Plc Direct digital synthesiser
DE69610576T2 (de) * 1995-05-19 2001-05-31 Matsushita Electric Works, Ltd. Schneideinheit für elektrischen Rasierapparat

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2027015A1 (de) * 1969-06-02 1970-12-10 Societe Generale de Constructions Electriques et Mecaniques, Alsthom, Paris Verfahren zur Umwandlung eines elektrischen analogen Signales in ein numerisches und umgekehrt und Schaltung zur Durchführung des Verfahrens
US3820028A (en) * 1971-08-27 1974-06-25 J Thomas Digital tone signal generator
NL160687C (nl) * 1972-06-10 1979-11-15 Philips Nv Toongenerator voor het opwekken van gekozen frequenties.
US3787836A (en) * 1972-06-15 1974-01-22 Bell Telephone Labor Inc Multitone telephone dialing circuit employing digital-to-analog tone synthesis

Also Published As

Publication number Publication date
SE7600157L (sv) 1976-07-12
FR2297526A1 (fr) 1976-08-06
SE416100B (sv) 1980-11-24
GB1529851A (en) 1978-10-25
DE2600606C2 (de) 1985-06-20
DE2600606A1 (de) 1976-07-15
FR2297526B1 (cg-RX-API-DMAC10.html) 1978-05-12

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