GB1411418A - Signal generators - Google Patents

Signal generators

Info

Publication number
GB1411418A
GB1411418A GB4124872A GB4124872A GB1411418A GB 1411418 A GB1411418 A GB 1411418A GB 4124872 A GB4124872 A GB 4124872A GB 4124872 A GB4124872 A GB 4124872A GB 1411418 A GB1411418 A GB 1411418A
Authority
GB
United Kingdom
Prior art keywords
signal generator
frequency
produced
resistive elements
circuitry
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
GB4124872A
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.)
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 GB1411418A publication Critical patent/GB1411418A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Push-Button Switches (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Telephonic Communication Services (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Electronic Switches (AREA)
GB4124872A 1971-09-07 1972-09-06 Signal generators Expired GB1411418A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17812671A 1971-09-07 1971-09-07

Publications (1)

Publication Number Publication Date
GB1411418A true GB1411418A (en) 1975-10-22

Family

ID=22651310

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4124872A Expired GB1411418A (en) 1971-09-07 1972-09-06 Signal generators

Country Status (10)

Country Link
US (1) US3699477A (fr)
JP (1) JPS5228522B2 (fr)
BE (1) BE788462A (fr)
CA (1) CA958083A (fr)
DE (1) DE2243625C3 (fr)
ES (1) ES406799A1 (fr)
FR (1) FR2152669B1 (fr)
GB (1) GB1411418A (fr)
IT (1) IT965227B (fr)
NL (1) NL7212067A (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7212510A (fr) * 1972-09-15 1974-03-19
CA988175A (en) * 1974-06-14 1976-04-27 Michael C.J. Cowpland Tone generator
US4110568A (en) * 1976-10-08 1978-08-29 Gte Atea, S.A. Dual tone multifrequency generator
JPS5461804A (en) * 1977-10-26 1979-05-18 Mitsubishi Electric Corp Information transmitter
US6326853B1 (en) * 1999-08-26 2001-12-04 Cypress Semiconductor Corp Circuitry, architecture and method(s) for phase matching and/or reducing load capacitance, current and/or power consumption in an oscillator
US8605889B2 (en) 2011-11-18 2013-12-10 Edward D. REGAN Method and device for encoding characters and routing calls using expanded dual-tone multi-frequency (DTMF) encoding scheme

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3349350A (en) * 1964-12-04 1967-10-24 Otto E Rittenbach Frequency step filter
US3424870A (en) * 1965-09-14 1969-01-28 Bell Telephone Labor Inc Multifrequency signal generator for tone-dialed telephones

Also Published As

Publication number Publication date
JPS5228522B2 (fr) 1977-07-27
JPS4837005A (fr) 1973-05-31
FR2152669B1 (fr) 1976-03-12
DE2243625C3 (de) 1975-04-17
CA958083A (en) 1974-11-19
FR2152669A1 (fr) 1973-04-27
BE788462A (fr) 1973-01-02
ES406799A1 (es) 1975-10-16
IT965227B (it) 1974-01-31
DE2243625A1 (de) 1973-03-15
US3699477A (en) 1972-10-17
DE2243625B2 (de) 1974-08-29
NL7212067A (fr) 1973-03-09

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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