IT986136B - TONE GENERATOR FOR THE GENERATION OF SELECTED FREQUENCIES - Google Patents

TONE GENERATOR FOR THE GENERATION OF SELECTED FREQUENCIES

Info

Publication number
IT986136B
IT986136B IT50551/73A IT5055173A IT986136B IT 986136 B IT986136 B IT 986136B IT 50551/73 A IT50551/73 A IT 50551/73A IT 5055173 A IT5055173 A IT 5055173A IT 986136 B IT986136 B IT 986136B
Authority
IT
Italy
Prior art keywords
generation
tone generator
selected frequencies
frequencies
tone
Prior art date
Application number
IT50551/73A
Other languages
Italian (it)
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Application granted granted Critical
Publication of IT986136B publication Critical patent/IT986136B/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
    • H03K23/64—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two
    • H03K23/68—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a base which is a non-integer
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
    • H03K23/64—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two
    • H03K23/66—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Analogue/Digital Conversion (AREA)
IT50551/73A 1972-06-10 1973-06-07 TONE GENERATOR FOR THE GENERATION OF SELECTED FREQUENCIES IT986136B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7207933.A NL160687C (en) 1972-06-10 1972-06-10 TONE GENERATOR FOR GENERATING SELECTED FREQUENCIES.

Publications (1)

Publication Number Publication Date
IT986136B true IT986136B (en) 1975-01-20

Family

ID=19816248

Family Applications (1)

Application Number Title Priority Date Filing Date
IT50551/73A IT986136B (en) 1972-06-10 1973-06-07 TONE GENERATOR FOR THE GENERATION OF SELECTED FREQUENCIES

Country Status (11)

Country Link
US (1) US3832639A (en)
JP (1) JPS5748883B2 (en)
BE (1) BE800738A (en)
CA (1) CA1001236A (en)
DE (1) DE2328992C3 (en)
DK (1) DK143676C (en)
ES (1) ES415718A1 (en)
FR (1) FR2188360B1 (en)
GB (1) GB1399200A (en)
IT (1) IT986136B (en)
NL (1) NL160687C (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2286564A1 (en) * 1974-09-30 1976-04-23 Roche Bernard MULTIFREQUENCY SIGNAL SYNTHESIZER DEVICE
GB1529851A (en) * 1975-01-10 1978-10-25 Gen Instr Microelect Frequency-signalling circuit for a telephone
US3992612A (en) * 1975-10-14 1976-11-16 The United States Of America As Represented By The Secretary Of The Army Rate multiplier
US4025865A (en) * 1976-01-08 1977-05-24 General Instrument Corporation Frequency-signalling circuit for a telephone
US4160173A (en) * 1976-12-14 1979-07-03 Tokyo Shibaura Electric Co., Ltd. Logic circuit with two pairs of cross-coupled nand/nor gates
JPS546845U (en) * 1977-06-17 1979-01-17
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
DE2924752C2 (en) * 1979-06-20 1984-02-02 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Tone generator for generating signaling frequencies in a DTMF telephone set
US4421952A (en) * 1981-10-16 1983-12-20 Motorola, Inc. Multi-frequency busy signal synthesizing circuitry
NL8301366A (en) * 1983-04-19 1984-11-16 Philips Nv TRANSMISSION CIRCUIT FOR A DTMF TELEPHONE.
US4698619A (en) * 1984-05-07 1987-10-06 Honeywell Inc. Variable frequency fire tone generator
HU191730B (en) * 1984-12-19 1987-04-28 Telefongyar Circuit arrangement for generating channel carrier, pilot, system carrier and carrier-receiver frequencies of the multichannel carrier-current telephone equipments of premodulation system
HU191731B (en) * 1984-12-19 1987-04-28 Telefongyar Circuit arrangement for generating system carrier, line pilot and channel carrier-control frequencies of multichannel open cable telephon equipments
JPH0413868Y2 (en) * 1988-11-29 1992-03-30
US5907597A (en) * 1994-08-05 1999-05-25 Smart Tone Authentication, Inc. Method and system for the secure communication of data

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215860A (en) * 1962-11-23 1965-11-02 Epsco Inc Clock pulse controlled sine wave synthesizer
FR1496141A (en) * 1966-06-03 1967-09-29 Cit Alcatel Frequency modulated wave generator
US3551826A (en) * 1968-05-16 1970-12-29 Raytheon Co Frequency multiplier and frequency waveform generator
US3623160A (en) * 1969-09-17 1971-11-23 Sanders Associates Inc Data modulator employing sinusoidal synthesis
US3657657A (en) * 1970-08-03 1972-04-18 William T Jefferson Digital sine wave generator
NL7107040A (en) * 1971-05-22 1972-11-24
US3752973A (en) * 1971-06-30 1973-08-14 Leybold Heraeus Verwaltung Apparatus for producing voltage functions

Also Published As

Publication number Publication date
NL160687C (en) 1979-11-15
NL7207933A (en) 1973-12-12
BE800738A (en) 1973-12-10
FR2188360B1 (en) 1983-05-06
DE2328992C3 (en) 1977-11-24
DE2328992B2 (en) 1977-04-14
ES415718A1 (en) 1976-02-01
JPS4951854A (en) 1974-05-20
NL160687B (en) 1979-06-15
US3832639A (en) 1974-08-27
FR2188360A1 (en) 1974-01-18
JPS5748883B2 (en) 1982-10-19
GB1399200A (en) 1975-06-25
CA1001236A (en) 1976-12-07
DE2328992A1 (en) 1973-12-20
DK143676C (en) 1982-03-01
DK143676B (en) 1981-09-21

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