ZA741555B - Loudspeaker communication terminal apparatus and method of operation - Google Patents

Loudspeaker communication terminal apparatus and method of operation

Info

Publication number
ZA741555B
ZA741555B ZA00741555*[A ZA741555A ZA741555B ZA 741555 B ZA741555 B ZA 741555B ZA 741555 A ZA741555 A ZA 741555A ZA 741555 B ZA741555 B ZA 741555B
Authority
ZA
South Africa
Prior art keywords
communication terminal
terminal apparatus
loudspeaker communication
loudspeaker
terminal
Prior art date
Application number
ZA00741555*[A
Inventor
W Clarke
J Gale
J Thompson
Original Assignee
Northern Electric Co
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 Northern Electric Co filed Critical Northern Electric Co
Publication of ZA741555B publication Critical patent/ZA741555B/en

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
    • H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Amplifiers (AREA)
ZA00741555*[A 1973-03-12 1974-04-09 Loudspeaker communication terminal apparatus and method of operation ZA741555B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA165,801A CA976677A (en) 1973-03-12 1973-03-12 Loudspeaking communication terminal apparatus and method of operation

Publications (1)

Publication Number Publication Date
ZA741555B true ZA741555B (en) 1975-02-26

Family

ID=4096059

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA00741555*[A ZA741555B (en) 1973-03-12 1974-04-09 Loudspeaker communication terminal apparatus and method of operation

Country Status (11)

Country Link
AU (1) AU476504B2 (en)
BE (1) BE812212A (en)
BR (1) BR7401879D0 (en)
CA (1) CA976677A (en)
FR (1) FR2221885B1 (en)
GB (1) GB1444828A (en)
IE (1) IE40708B1 (en)
IT (1) IT1025013B (en)
NL (1) NL169809C (en)
SE (1) SE400148B (en)
ZA (1) ZA741555B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4178548A (en) * 1976-10-04 1979-12-11 Geraldine E. Thompson Voice actuated mobile radio
DE2842369A1 (en) * 1978-09-28 1980-04-10 Siemens Ag CIRCUIT ARRANGEMENT FOR A VOICE-CONTROLLED SPEAKER STATION IN TELECOMMUNICATION, IN PARTICULAR TELEPHONE SYSTEMS
GB2174578B (en) * 1985-05-04 1988-11-09 Stc Plc Loud speaking telephone
FI73341C (en) * 1985-08-06 1987-09-10 Outel Oy MELLANFOERSTAERKARE SOM ANVAENDS I TVAOLEDNINGSFOERBINDELSER I ETT VALBART TELEFONNAET SAMT FOERFARANDE FOER REGLERING AV DESS FOERSTAERKNING.
CA1291837C (en) * 1987-07-15 1991-11-05 Juro Ohga Electronic telephone terminal having noise suppression function

Also Published As

Publication number Publication date
CA976677A (en) 1975-10-21
NL169809B (en) 1982-03-16
BR7401879D0 (en) 1974-11-19
GB1444828A (en) 1976-08-04
NL7403286A (en) 1974-09-16
DE2411501A1 (en) 1974-10-10
DE2411501B2 (en) 1975-08-21
NL169809C (en) 1982-08-16
SE400148B (en) 1978-03-13
AU476504B2 (en) 1976-09-23
BE812212A (en) 1974-07-31
IE40708B1 (en) 1979-08-01
FR2221885B1 (en) 1982-04-23
AU6657974A (en) 1975-09-18
FR2221885A1 (en) 1974-10-11
IT1025013B (en) 1978-08-10

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