CA996692A - Digital control of a loudspeaking telephone system - Google Patents

Digital control of a loudspeaking telephone system

Info

Publication number
CA996692A
CA996692A CA215,876A CA215876A CA996692A CA 996692 A CA996692 A CA 996692A CA 215876 A CA215876 A CA 215876A CA 996692 A CA996692 A CA 996692A
Authority
CA
Canada
Prior art keywords
digital control
telephone system
loudspeaking telephone
loudspeaking
digital
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
CA215,876A
Other versions
CA215876S (en
Inventor
Russell W. Brown
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.)
Nortel Networks Ltd
Original Assignee
Northern Electric Co 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 Northern Electric Co Ltd filed Critical Northern Electric Co Ltd
Priority to CA215,876A priority Critical patent/CA996692A/en
Priority to NL7514138A priority patent/NL7514138A/en
Priority to GB50016/75A priority patent/GB1519607A/en
Priority to IT30127/75A priority patent/IT1050035B/en
Priority to JP50146495A priority patent/JPS5183709A/ja
Priority to DE19752555552 priority patent/DE2555552A1/en
Priority to SE7514036A priority patent/SE414856B/en
Priority to NO754207A priority patent/NO754207L/no
Priority to FR7538184A priority patent/FR2294595A1/en
Application granted granted Critical
Publication of CA996692A publication Critical patent/CA996692A/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
    • 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)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Transceivers (AREA)
CA215,876A 1974-12-12 1974-12-12 Digital control of a loudspeaking telephone system Expired CA996692A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
CA215,876A CA996692A (en) 1974-12-12 1974-12-12 Digital control of a loudspeaking telephone system
NL7514138A NL7514138A (en) 1974-12-12 1975-12-04 SPEAKING TELEPHONE SYSTEM.
GB50016/75A GB1519607A (en) 1974-12-12 1975-12-05 Digital control of a loudspeaking telephone system
IT30127/75A IT1050035B (en) 1974-12-12 1975-12-09 DIGITAL CONTROL SPEAKER TELEPHONE SYSTEM
JP50146495A JPS5183709A (en) 1974-12-12 1975-12-10
DE19752555552 DE2555552A1 (en) 1974-12-12 1975-12-10 DIGITAL CONTROL FOR A LOUDSPEAKER SYSTEM
SE7514036A SE414856B (en) 1974-12-12 1975-12-11 SPEAKING PHONE SYSTEM
NO754207A NO754207L (en) 1974-12-12 1975-12-11
FR7538184A FR2294595A1 (en) 1974-12-12 1975-12-12 HANDS-FREE TELEPHONE SYSTEM WITH DIGITAL CONTROL

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 (1)

Publication Number Publication Date
CA996692A true CA996692A (en) 1976-09-07

Family

ID=4101835

Family Applications (1)

Application Number Title Priority Date Filing Date
CA215,876A Expired CA996692A (en) 1974-12-12 1974-12-12 Digital control of a loudspeaking telephone 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
IT1050035B (en) 1981-03-10
NL7514138A (en) 1976-06-15
SE414856B (en) 1980-08-18
FR2294595A1 (en) 1976-07-09
NO754207L (en) 1976-06-15
DE2555552A1 (en) 1976-06-16
SE7514036L (en) 1976-06-14
GB1519607A (en) 1978-08-02
JPS5183709A (en) 1976-07-22

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