FR2168549A1 - - Google Patents

Info

Publication number
FR2168549A1
FR2168549A1 FR7301931A FR7301931A FR2168549A1 FR 2168549 A1 FR2168549 A1 FR 2168549A1 FR 7301931 A FR7301931 A FR 7301931A FR 7301931 A FR7301931 A FR 7301931A FR 2168549 A1 FR2168549 A1 FR 2168549A1
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.)
Granted
Application number
FR7301931A
Other versions
FR2168549B1 (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 FR2168549A1 publication Critical patent/FR2168549A1/fr
Application granted granted Critical
Publication of FR2168549B1 publication Critical patent/FR2168549B1/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6008—Substation equipment, e.g. for use by subscribers including speech amplifiers in the transmitter circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
FR7301931A 1972-01-20 1973-01-19 Expired FR2168549B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US21946672A 1972-01-20 1972-01-20

Publications (2)

Publication Number Publication Date
FR2168549A1 true FR2168549A1 (fr) 1973-08-31
FR2168549B1 FR2168549B1 (fr) 1976-11-05

Family

ID=22819375

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7301931A Expired FR2168549B1 (fr) 1972-01-20 1973-01-19

Country Status (9)

Country Link
US (1) US3743956A (fr)
JP (1) JPS5230201B2 (fr)
BE (1) BE794023A (fr)
CA (1) CA979083A (fr)
DE (1) DE2302575B2 (fr)
ES (1) ES411074A1 (fr)
FR (1) FR2168549B1 (fr)
GB (1) GB1387103A (fr)
IT (1) IT974461B (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH329937A (de) * 1954-02-08 1958-05-15 Standard Telephon & Radio Ag Teilnehmertelephonstation mit Rückhörverhinderung
US2945133A (en) * 1955-11-14 1960-07-12 Honeywell Regulator Co Transistor circuit
GB1124629A (en) * 1965-12-23 1968-08-21 Int Standard Electric Corp A transistorised subscriber's telephone circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3100877A (en) * 1960-12-27 1963-08-13 Honeywell Regulator Co Transistor amplifier with constant input impedance

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH329937A (de) * 1954-02-08 1958-05-15 Standard Telephon & Radio Ag Teilnehmertelephonstation mit Rückhörverhinderung
US2945133A (en) * 1955-11-14 1960-07-12 Honeywell Regulator Co Transistor circuit
GB1124629A (en) * 1965-12-23 1968-08-21 Int Standard Electric Corp A transistorised subscriber's telephone circuit

Also Published As

Publication number Publication date
CA979083A (en) 1975-12-02
GB1387103A (en) 1975-03-12
US3743956A (en) 1973-07-03
JPS5230201B2 (fr) 1977-08-06
FR2168549B1 (fr) 1976-11-05
DE2302575B2 (de) 1976-04-08
DE2302575A1 (de) 1973-07-26
IT974461B (it) 1974-06-20
ES411074A1 (es) 1976-01-01
JPS4883707A (fr) 1973-11-08
BE794023A (fr) 1973-05-02

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Legal Events

Date Code Title Description
ST Notification of lapse