SE414856B - SPEAKING PHONE SYSTEM - Google Patents

SPEAKING PHONE SYSTEM

Info

Publication number
SE414856B
SE414856B SE7514036A SE7514036A SE414856B SE 414856 B SE414856 B SE 414856B SE 7514036 A SE7514036 A SE 7514036A SE 7514036 A SE7514036 A SE 7514036A SE 414856 B SE414856 B SE 414856B
Authority
SE
Sweden
Prior art keywords
phone system
speaking phone
speaking
phone
Prior art date
Application number
SE7514036A
Other languages
Swedish (sv)
Other versions
SE7514036L (en
Inventor
R W Brown
Original Assignee
Northern Telecom
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 Telecom filed Critical Northern Telecom
Publication of SE7514036L publication Critical patent/SE7514036L/en
Publication of SE414856B publication Critical patent/SE414856B/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
    • H04M9/085—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using digital techniques

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Analogue/Digital Conversion (AREA)
  • Transceivers (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
SE7514036A 1974-12-12 1975-12-11 SPEAKING PHONE SYSTEM SE414856B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA215,876A CA996692A (en) 1974-12-12 1974-12-12 Digital control of a loudspeaking telephone system

Publications (2)

Publication Number Publication Date
SE7514036L SE7514036L (en) 1976-06-14
SE414856B true SE414856B (en) 1980-08-18

Family

ID=4101835

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7514036A SE414856B (en) 1974-12-12 1975-12-11 SPEAKING PHONE SYSTEM

Country Status (9)

Country Link
JP (1) JPS5183709A (en)
CA (1) CA996692A (en)
DE (1) DE2555552A1 (en)
FR (1) FR2294595A1 (en)
GB (1) GB1519607A (en)
IT (1) IT1050035B (en)
NL (1) NL7514138A (en)
NO (1) NO754207L (en)
SE (1) SE414856B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2659028C3 (en) * 1976-12-27 1979-05-31 Dasy Inter S.A., Genf (Schweiz) Circuit arrangement for preventing feedback
DE2952122A1 (en) * 1979-12-22 1981-06-25 Deutsche Itt Industries Gmbh, 7800 Freiburg Speech controlled telephonic communication channel - employing digital filters and comparators to set reception and transmission channel damping
JPS5797262A (en) * 1980-12-09 1982-06-16 Nippon Telegr & Teleph Corp <Ntt> Loud speaker telephone set system
GB2137458B (en) * 1983-03-01 1986-11-19 Standard Telephones Cables Ltd Digital handsfree telephone
GB2161047B (en) * 1984-06-28 1987-09-16 Stc Plc Improvements in telephone instruments
GB2174578B (en) * 1985-05-04 1988-11-09 Stc Plc Loud speaking telephone
GB2197166A (en) * 1986-11-07 1988-05-11 Storno As Controlling gain in speech-controlled telephones
EP0271948A3 (en) * 1986-12-16 1989-05-03 Alcatel N.V. Telecommunication circuit
DE4130045A1 (en) * 1991-09-10 1993-03-18 Standard Elektrik Lorenz Ag CIRCUIT ARRANGEMENT FOR THE DYNAMIC CONTROL OF A VOICE TERMINAL

Also Published As

Publication number Publication date
NO754207L (en) 1976-06-15
NL7514138A (en) 1976-06-15
GB1519607A (en) 1978-08-02
JPS5183709A (en) 1976-07-22
DE2555552A1 (en) 1976-06-16
SE7514036L (en) 1976-06-14
FR2294595A1 (en) 1976-07-09
CA996692A (en) 1976-09-07
IT1050035B (en) 1981-03-10

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