GB1510646A - Synthesizer of multifrequency code signals for a keyboard type telephone station - Google Patents

Synthesizer of multifrequency code signals for a keyboard type telephone station

Info

Publication number
GB1510646A
GB1510646A GB40018/75A GB4001875A GB1510646A GB 1510646 A GB1510646 A GB 1510646A GB 40018/75 A GB40018/75 A GB 40018/75A GB 4001875 A GB4001875 A GB 4001875A GB 1510646 A GB1510646 A GB 1510646A
Authority
GB
United Kingdom
Prior art keywords
bit
memory
sept
shift register
sample
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
GB40018/75A
Other languages
English (en)
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.)
LARDY J
MAJOS J
Original Assignee
LARDY J
MAJOS J
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 LARDY J, MAJOS J filed Critical LARDY J
Publication of GB1510646A publication Critical patent/GB1510646A/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
    • 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)
GB40018/75A 1974-09-30 1975-09-30 Synthesizer of multifrequency code signals for a keyboard type telephone station Expired GB1510646A (en)

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 (1)

Publication Number Publication Date
GB1510646A true GB1510646A (en) 1978-05-10

Family

ID=9143593

Family Applications (1)

Application Number Title Priority Date Filing Date
GB40018/75A Expired GB1510646A (en) 1974-09-30 1975-09-30 Synthesizer of multifrequency code signals for a keyboard type telephone station

Country Status (4)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148061A (en) * 1983-10-07 1985-05-22 Sony Corp Signal generators using digital memories
GB2317251A (en) * 1996-09-13 1998-03-18 Holtek Microelectronics Inc Dual-tone multifrequency generator

Families Citing this family (10)

* 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
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
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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148061A (en) * 1983-10-07 1985-05-22 Sony Corp Signal generators using digital memories
US4701871A (en) * 1983-10-07 1987-10-20 Sony Corporation Signal generator using digital memory
GB2317251A (en) * 1996-09-13 1998-03-18 Holtek Microelectronics Inc Dual-tone multifrequency generator
GB2317251B (en) * 1996-09-13 1998-12-16 Holtek Microelectronics Inc A cycle-modulating type of dual-tone multi-frequency generator

Also Published As

Publication number Publication date
DE2543356A1 (de) 1976-04-15
FR2286552A1 (fr) 1976-04-23
FR2286552B1 (enExample) 1977-10-28
DE2543356B2 (de) 1977-12-15
DE2543356C3 (de) 1978-08-10
US4017693A (en) 1977-04-12

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee