GB948849A - Improvements in or relating to amplifying circuit arrangements - Google Patents

Improvements in or relating to amplifying circuit arrangements

Info

Publication number
GB948849A
GB948849A GB27470/61A GB2747061A GB948849A GB 948849 A GB948849 A GB 948849A GB 27470/61 A GB27470/61 A GB 27470/61A GB 2747061 A GB2747061 A GB 2747061A GB 948849 A GB948849 A GB 948849A
Authority
GB
United Kingdom
Prior art keywords
signals
microphone
amplified
threshold level
transistor
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
GB27470/61A
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 Electrical Industries Ltd
Original Assignee
Philips Electrical 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 Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB948849A publication Critical patent/GB948849A/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
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude
    • H03G11/02—Limiting amplitude; Limiting rate of change of amplitude by means of diodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/58—Anti-side-tone circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
GB27470/61A 1960-08-01 1961-07-28 Improvements in or relating to amplifying circuit arrangements Expired GB948849A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL254433 1960-08-01

Publications (1)

Publication Number Publication Date
GB948849A true GB948849A (en) 1964-02-05

Family

ID=19752506

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27470/61A Expired GB948849A (en) 1960-08-01 1961-07-28 Improvements in or relating to amplifying circuit arrangements

Country Status (6)

Country Link
US (1) US3177294A (OSRAM)
JP (1) JPS3811761B1 (OSRAM)
DE (1) DE1154522B (OSRAM)
FR (1) FR1296397A (OSRAM)
GB (1) GB948849A (OSRAM)
NL (1) NL254433A (OSRAM)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3417390A (en) * 1965-10-12 1968-12-17 Gen Signal Corp Telemetering
FR2055900A5 (OSRAM) * 1969-08-05 1971-05-14 Ericsson Telefon Ab L M

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2223700A (en) * 1938-10-10 1940-12-03 Carl A Norgren Lubricator
US2332430A (en) * 1942-07-16 1943-10-19 Bell Telephone Labor Inc Two-way telephone system
FR1005063A (fr) * 1947-05-29 1952-04-07 Dispositif pour éviter l'effet larsen dans les installations téléphoniques à hautparleur
US2743314A (en) * 1950-09-06 1956-04-24 Le Teleampliphone Soc Two-way loudspeaker telephone installations
US2785231A (en) * 1954-02-25 1957-03-12 Bell Telephone Labor Inc Telephone set with amplifier
BE541780A (OSRAM) * 1954-10-06
GB839975A (en) * 1955-07-28 1960-06-29 Telephone Mfg Co Ltd Improvements in and relating to signal switched telecommunication circuits
DE1058563B (de) * 1956-02-22 1959-06-04 Siemens Ag Schaltungsanordnung zur Pfeifminderung bei Lautfernsprechanlagen
US2801288A (en) * 1956-03-29 1957-07-30 Bell Telephone Labor Inc Equalizing circuit
BE563970A (OSRAM) * 1957-01-15
NL245570A (OSRAM) * 1958-12-29

Also Published As

Publication number Publication date
NL254433A (OSRAM)
FR1296397A (fr) 1962-06-15
DE1154522B (de) 1963-09-19
JPS3811761B1 (OSRAM) 1963-07-11
US3177294A (en) 1965-04-06

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