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
• • 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
  • H03B5/26—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 frequency-determining element being part of bridge circuit in closed ring around which signal is transmitted; frequency-determining element being connected via a bridge circuit to such a closed ring, e.g. Wien-Bridge oscillator, parallel-T oscillator

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Amplifiers (AREA)
• Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=5856372

Family Applications (1)

Country Status (11)

Family Cites Families (1)

• 1972
  • 1972-09-14 DE DE2245182A patent/DE2245182A1/de active Pending
• 1973
  • 1973-09-04 NL NL7312224A patent/NL7312224A/xx unknown
  • 1973-09-11 ZA ZA737225*A patent/ZA737225B/xx unknown
  • 1973-09-11 IT IT28770/73A patent/IT993192B/it active
  • 1973-09-12 FR FR7332758A patent/FR2200711A1/fr not_active Withdrawn
  • 1973-09-12 LU LU68408A patent/LU68408A1/xx unknown
  • 1973-09-13 AU AU60303/73A patent/AU6030373A/en not_active Expired
  • 1973-09-13 AR AR250085A patent/AR195943A1/es active
  • 1973-09-13 BR BR7112/73A patent/BR7307112D0/pt unknown
  • 1973-09-13 JP JP48103703A patent/JPS4969256A/ja active Pending
  • 1973-09-14 BE BE135664A patent/BE804872A/xx unknown

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