DE2543356C3 - Numerischer Generator zum Erzeugen von Mehrfrequenzsignalen - Google Patents

Numerischer Generator zum Erzeugen von Mehrfrequenzsignalen

Info

Publication number
DE2543356C3
DE2543356C3 DE2543356A DE2543356A DE2543356C3 DE 2543356 C3 DE2543356 C3 DE 2543356C3 DE 2543356 A DE2543356 A DE 2543356A DE 2543356 A DE2543356 A DE 2543356A DE 2543356 C3 DE2543356 C3 DE 2543356C3
Authority
DE
Germany
Prior art keywords
frequency
read
memory
address
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.)
Expired
Application number
DE2543356A
Other languages
German (de)
English (en)
Other versions
DE2543356A1 (de
DE2543356B2 (de
Inventor
Bernard Roche
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of DE2543356A1 publication Critical patent/DE2543356A1/de
Publication of DE2543356B2 publication Critical patent/DE2543356B2/de
Application granted granted Critical
Publication of DE2543356C3 publication Critical patent/DE2543356C3/de
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
    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/80—Generating trains of sinusoidal oscillations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Analogue/Digital Conversion (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Complex Calculations (AREA)
DE2543356A 1974-09-30 1975-09-29 Numerischer Generator zum Erzeugen von Mehrfrequenzsignalen Expired DE2543356C3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7432908A FR2286552A1 (fr) 1974-09-30 1974-09-30 Generateur numerique de signaux du code a multifrequences

Publications (3)

Publication Number Publication Date
DE2543356A1 DE2543356A1 (de) 1976-04-15
DE2543356B2 DE2543356B2 (de) 1977-12-15
DE2543356C3 true DE2543356C3 (de) 1978-08-10

Family

ID=9143593

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2543356A Expired DE2543356C3 (de) 1974-09-30 1975-09-29 Numerischer Generator zum Erzeugen von Mehrfrequenzsignalen

Country Status (4)

Country Link
US (1) US4017693A (enExample)
DE (1) DE2543356C3 (enExample)
FR (1) FR2286552A1 (enExample)
GB (1) GB1510646A (enExample)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2659512B1 (de) * 1976-12-30 1978-05-24 Wandel & Goltermann Verfahren und Schaltungsanordnung zum Erzeugen eines Digitalsignals zum Pruefen einer PCM-Endstelle
US4132871A (en) * 1977-06-22 1979-01-02 Fairchild Camera And Instrument Corporation Digitally synthesized multi-frequency signal generator
US4218587A (en) * 1978-09-18 1980-08-19 Storage Technology Corporation Complex signal generation and transmission
CA1124898A (en) * 1979-03-01 1982-06-01 Ernst A. Munter Pcm tone signal generator
DE2952380C2 (de) * 1979-12-24 1984-02-09 Hagenuk GmbH, 2300 Kiel Schaltungsanordnung zur Datenübertragung auf Fernsprechleitungen
US4349704A (en) * 1979-12-31 1982-09-14 Bell Telephone Laboratories, Incorporated Digital multifrequency signal generator
US4394743A (en) * 1980-12-18 1983-07-19 Bell Telephone Laboratories, Incorporated Tone generation method and apparatus using stored reference calibration coefficients
JP2785821B2 (ja) * 1983-10-07 1998-08-13 ソニー株式会社 デイジタル信号発生回路
US4805193A (en) * 1987-06-04 1989-02-14 Motorola, Inc. Protection of energy information in sub-band coding
US5034977A (en) * 1989-04-04 1991-07-23 Industrial Technology Research Institute Phase accumulation dual tone multiple frequency generator
GB2317251B (en) * 1996-09-13 1998-12-16 Holtek Microelectronics Inc A cycle-modulating type of dual-tone multi-frequency generator
US20060105588A1 (en) * 2004-11-01 2006-05-18 Telcom Marketing Group, Inc. Telephone design and handset placement on inmate telephones to reduce the possibility of hanging, strangulation, or death

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1236961A (en) * 1968-01-12 1971-06-23 Gen Electric Co Ltd Improvements in or relating to electric impulse transmitters
US3610800A (en) * 1969-10-30 1971-10-05 North American Rockwell Digital electronic keyboard instrument with automatic transposition
FR2098528A5 (enExample) * 1970-07-17 1972-03-10 Lannionnais Electronique
US3772681A (en) * 1970-10-14 1973-11-13 Post Office Frequency synthesiser
US3787836A (en) * 1972-06-15 1974-01-22 Bell Telephone Labor Inc Multitone telephone dialing circuit employing digital-to-analog tone synthesis
US3824484A (en) * 1972-10-12 1974-07-16 Compound Computing Corp Touch-tone signal generation system
US3787639A (en) * 1972-11-16 1974-01-22 Northern Electric Co Pushbutton electronic pulsing dial

Also Published As

Publication number Publication date
DE2543356A1 (de) 1976-04-15
GB1510646A (en) 1978-05-10
FR2286552A1 (fr) 1976-04-23
FR2286552B1 (enExample) 1977-10-28
DE2543356B2 (de) 1977-12-15
US4017693A (en) 1977-04-12

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Legal Events

Date Code Title Description
C3 Grant after two publication steps (3rd publication)
8339 Ceased/non-payment of the annual fee