GB1406971A - Signal generators - Google Patents

Signal generators

Info

Publication number
GB1406971A
GB1406971A GB4278473A GB4278473A GB1406971A GB 1406971 A GB1406971 A GB 1406971A GB 4278473 A GB4278473 A GB 4278473A GB 4278473 A GB4278473 A GB 4278473A GB 1406971 A GB1406971 A GB 1406971A
Authority
GB
United Kingdom
Prior art keywords
feedback
transistor
oscillator
frequency
switches
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
GB4278473A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1406971A publication Critical patent/GB1406971A/en
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
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
    • H03B5/24—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator active element in amplifier being semiconductor device
    • 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
    • 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
    • H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
    • H03B2201/01—Varying the frequency of the oscillations by manual means

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
GB4278473A 1972-09-15 1973-09-12 Signal generators Expired GB1406971A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7212510A NL7212510A (enExample) 1972-09-15 1972-09-15

Publications (1)

Publication Number Publication Date
GB1406971A true GB1406971A (en) 1975-09-17

Family

ID=19816941

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4278473A Expired GB1406971A (en) 1972-09-15 1973-09-12 Signal generators

Country Status (9)

Country Link
US (1) US3916341A (enExample)
JP (1) JPS5324241B2 (enExample)
AU (1) AU471479B2 (enExample)
BE (1) BE804831A (enExample)
CA (1) CA977878A (enExample)
DE (1) DE2343084C3 (enExample)
FR (1) FR2200712B1 (enExample)
GB (1) GB1406971A (enExample)
NL (1) NL7212510A (enExample)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6356134B1 (en) * 2000-03-21 2002-03-12 International Business Machines Corporation Universal clock generator circuit and adjustment method for providing a plurality of clock frequencies

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2120067A1 (de) * 1970-05-15 1971-12-02 Inst Fuer Nachrichtentechnik Schaltungsanordnung zur Verhinderung der Auswertung von ausgesendeten Falschoder Fehlinformationen bei gleichzeitiger Betätigung zweier Tasten eines Tastwahlapparates in Fernsprechanlagen mit Zweifrequenz-Codewahl
BE788462A (fr) * 1971-09-07 1973-01-02 Western Electric Co Generateur de signaux electriques multifrequences
US3720887A (en) * 1972-02-22 1973-03-13 Microsystems Int Ltd Frequency determining network

Also Published As

Publication number Publication date
AU471479B2 (en) 1976-04-29
AU6024773A (en) 1975-03-13
JPS5324241B2 (enExample) 1978-07-19
USB392753I5 (enExample) 1975-01-28
US3916341A (en) 1975-10-28
FR2200712A1 (enExample) 1974-04-19
DE2343084B2 (de) 1977-01-27
BE804831A (fr) 1974-03-13
DE2343084C3 (de) 1977-09-15
JPS4969204A (enExample) 1974-07-04
FR2200712B1 (enExample) 1980-03-07
DE2343084A1 (de) 1974-03-21
NL7212510A (enExample) 1974-03-19
CA977878A (en) 1975-11-11

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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