FR1287248A - Circuit for a speaker phone system - Google Patents

Circuit for a speaker phone system

Info

Publication number
FR1287248A
FR1287248A FR860009A FR860009A FR1287248A FR 1287248 A FR1287248 A FR 1287248A FR 860009 A FR860009 A FR 860009A FR 860009 A FR860009 A FR 860009A FR 1287248 A FR1287248 A FR 1287248A
Authority
FR
France
Prior art keywords
circuit
phone system
speaker phone
speaker
phone
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
FR860009A
Other languages
French (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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of FR1287248A publication Critical patent/FR1287248A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/34—DC amplifiers in which all stages are DC-coupled
    • H03F3/343—DC amplifiers in which all stages are DC-coupled with semiconductor devices only
    • H03F3/345—DC amplifiers in which all stages are DC-coupled with semiconductor devices only with field-effect devices
    • H03F3/3455—DC amplifiers in which all stages are DC-coupled with semiconductor devices only with field-effect devices with junction-FET's
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
    • H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
    • H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
    • H03K3/286—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable
    • H03K3/2893—Bistables with hysteresis, e.g. Schmitt trigger

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Electronic Switches (AREA)
FR860009A 1959-06-11 1961-04-27 Circuit for a speaker phone system Expired FR1287248A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CA701637T
GB20034/59A GB950182A (en) 1959-06-11 1959-06-11 Improvements in and relating to electrical circuits employing transistor networks
NL250981 1960-04-28
NL1127407X 1960-04-28

Publications (1)

Publication Number Publication Date
FR1287248A true FR1287248A (en) 1962-03-09

Family

ID=76269552

Family Applications (2)

Application Number Title Priority Date Filing Date
FR829644A Expired FR1259724A (en) 1959-06-11 1960-06-10 Transistor networks for the detection of electrical signal levels
FR860009A Expired FR1287248A (en) 1959-06-11 1961-04-27 Circuit for a speaker phone system

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR829644A Expired FR1259724A (en) 1959-06-11 1960-06-10 Transistor networks for the detection of electrical signal levels

Country Status (6)

Country Link
JP (3) JPS384353B1 (en)
CA (1) CA701637A (en)
DE (2) DE1141333B (en)
FR (2) FR1259724A (en)
GB (3) GB950183A (en)
NL (1) NL250981A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH407212A (en) * 1963-08-29 1966-02-15 Siemens Ag Albis Amplitude discriminator with a bistable circuit
US3373295A (en) * 1965-04-27 1968-03-12 Aerojet General Co Memory element
SE435679B (en) * 1980-09-17 1984-10-15 Landskrona Finans Ab STIMULATOR SYSTEM, INCLUDING ONE OF A RECHARGEABLE BATTERY DRIVE PULSE GENERATOR

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1048946B (en) * 1957-07-19 1959-01-22 Siemens Ag Circuit arrangement for controlling the power supply to a consumer with, in particular, an inductive reactance component by means of a transistor

Also Published As

Publication number Publication date
JPS3819521B1 (en) 1963-09-26
GB950182A (en) 1964-02-19
CA701637A (en) 1965-01-12
JPS384353B1 (en) 1963-02-24
GB936756A (en) 1963-09-11
FR1259724A (en) 1961-04-28
NL250981A (en)
DE1141333B (en) 1962-12-20
GB950183A (en) 1964-02-19
JPS384354B1 (en) 1963-04-24
DE1127407B (en) 1962-04-12

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