GB1338633A - Digital frequency generator - Google Patents

Digital frequency generator

Info

Publication number
GB1338633A
GB1338633A GB1814171A GB1814171A GB1338633A GB 1338633 A GB1338633 A GB 1338633A GB 1814171 A GB1814171 A GB 1814171A GB 1814171 A GB1814171 A GB 1814171A GB 1338633 A GB1338633 A GB 1338633A
Authority
GB
United Kingdom
Prior art keywords
output
digital
filter
oscillator
stored
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
GB1814171A
Other languages
English (en)
Inventor
J-B Jacob
P Lavanant
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.)
LANNIONNAIS ELECTRONIQUE
Alcatel CIT SA
Nokia Inc
Original Assignee
LANNIONNAIS ELECTRONIQUE
Compagnie Industrielle de Telecommunication CIT Alcatel SA
Nokia Inc
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
Priority claimed from FR7019605A external-priority patent/FR2087711A5/fr
Priority claimed from FR7022230A external-priority patent/FR2094307A6/fr
Application filed by LANNIONNAIS ELECTRONIQUE, Compagnie Industrielle de Telecommunication CIT Alcatel SA, Nokia Inc filed Critical LANNIONNAIS ELECTRONIQUE
Publication of GB1338633A publication Critical patent/GB1338633A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L5/00—Automatic control of voltage, current, or power
    • 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)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
GB1814171A 1970-05-28 1971-05-28 Digital frequency generator Expired GB1338633A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7019605A FR2087711A5 (enExample) 1970-05-28 1970-05-28
FR7022230A FR2094307A6 (enExample) 1970-06-15 1970-06-15

Publications (1)

Publication Number Publication Date
GB1338633A true GB1338633A (en) 1973-11-28

Family

ID=26215768

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1814171A Expired GB1338633A (en) 1970-05-28 1971-05-28 Digital frequency generator

Country Status (4)

Country Link
DE (1) DE2126717A1 (enExample)
GB (1) GB1338633A (enExample)
NL (1) NL7107106A (enExample)
SE (1) SE373711B (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058805A (en) 1975-06-16 1977-11-15 Comdial Corporation Digital multitone generator for telephone dialing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058805A (en) 1975-06-16 1977-11-15 Comdial Corporation Digital multitone generator for telephone dialing
US4142184A (en) 1975-06-16 1979-02-27 Comdial Corporation Digital multitone generator for telephone dialing

Also Published As

Publication number Publication date
DE2126717A1 (de) 1971-12-09
SE373711B (sv) 1975-02-10
NL7107106A (enExample) 1971-11-30

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee