FR2234703B1 - - Google Patents

Info

Publication number
FR2234703B1
FR2234703B1 FR7421925A FR7421925A FR2234703B1 FR 2234703 B1 FR2234703 B1 FR 2234703B1 FR 7421925 A FR7421925 A FR 7421925A FR 7421925 A FR7421925 A FR 7421925A FR 2234703 B1 FR2234703 B1 FR 2234703B1
Authority
FR
France
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
FR7421925A
Other versions
FR2234703A1 (fr
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.)
AT&T Corp
Original Assignee
Western Electric Co 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
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of FR2234703A1 publication Critical patent/FR2234703A1/fr
Application granted granted Critical
Publication of FR2234703B1 publication Critical patent/FR2234703B1/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B28/00—Generation of oscillations by methods not covered by groups H03B5/00 - H03B27/00, including modification of the waveform to produce sinusoidal oscillations
    • 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)
  • Power Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Manipulation Of Pulses (AREA)
  • Networks Using Active Elements (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Analogue/Digital Conversion (AREA)
FR7421925A 1973-06-25 1974-06-24 Expired FR2234703B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00373426A US3838348A (en) 1973-06-25 1973-06-25 Digital multifrequency signal generator

Publications (2)

Publication Number Publication Date
FR2234703A1 FR2234703A1 (fr) 1975-01-17
FR2234703B1 true FR2234703B1 (fr) 1976-12-24

Family

ID=23472363

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7421925A Expired FR2234703B1 (fr) 1973-06-25 1974-06-24

Country Status (12)

Country Link
US (1) US3838348A (fr)
JP (1) JPS5038443A (fr)
AU (1) AU472886B2 (fr)
BE (1) BE816679A (fr)
CA (1) CA1009314A (fr)
DE (1) DE2430076B2 (fr)
ES (1) ES427586A1 (fr)
FR (1) FR2234703B1 (fr)
GB (1) GB1448300A (fr)
IT (1) IT1014360B (fr)
NL (1) NL7408138A (fr)
SE (1) SE396261B (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021654A (en) * 1975-06-11 1977-05-03 Paradyne, Inc. Digital filter
JPS58717B2 (ja) * 1977-08-22 1983-01-07 株式会社日立国際電気 選択呼出回路
US4421952A (en) * 1981-10-16 1983-12-20 Motorola, Inc. Multi-frequency busy signal synthesizing circuitry
NL8301366A (nl) * 1983-04-19 1984-11-16 Philips Nv Transmissieschakeling voor een dtmf-telefoontoestel.
AU593671B2 (en) * 1986-08-12 1990-02-15 Alcatel N.V. Signal generator
US5121069A (en) * 1988-12-16 1992-06-09 Siemens Transmission Systems, Inc. Low frequency sinewave generator
US6212229B1 (en) * 1998-12-16 2001-04-03 General Dynamics Government Systems Corporation Adaptive pre-emphasis technique
JP6310709B2 (ja) * 2014-01-28 2018-04-11 株式会社日立製作所 周期信号発生装置
KR101836705B1 (ko) * 2016-09-26 2018-03-09 현대자동차주식회사 정현파 생성 장치 및 방법

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1279058A (en) * 1970-01-28 1972-06-21 Seiko Instr & Electronics Timepiece
US3657657A (en) * 1970-08-03 1972-04-18 William T Jefferson Digital sine wave generator
US3657669A (en) * 1970-09-02 1972-04-18 Gte Laboratories Inc Frequency domain adaptive equalizer
US3701027A (en) * 1971-04-15 1972-10-24 Bunker Ramo Digital frequency synthesizer
US3699461A (en) * 1971-09-27 1972-10-17 Collins Radio Co Analog harmonic rejecting phase detector
US3719897A (en) * 1971-11-26 1973-03-06 Gte Automatic Electric Lab Inc Digital tone generator

Also Published As

Publication number Publication date
JPS5038443A (fr) 1975-04-09
DE2430076A1 (de) 1975-04-30
AU472886B2 (en) 1976-06-10
AU7024074A (en) 1976-01-08
NL7408138A (fr) 1974-12-30
US3838348A (en) 1974-09-24
IT1014360B (it) 1977-04-20
CA1009314A (en) 1977-04-26
SE396261B (sv) 1977-09-12
DE2430076B2 (de) 1976-09-09
GB1448300A (en) 1976-09-02
ES427586A1 (es) 1976-07-16
BE816679A (fr) 1974-10-16
FR2234703A1 (fr) 1975-01-17
SE7407758L (fr) 1974-12-27

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Legal Events

Date Code Title Description
ST Notification of lapse