IT8120955A0 - Circuito di sottostazione ad altoparlante perfezionato. - Google Patents

Circuito di sottostazione ad altoparlante perfezionato.

Info

Publication number
IT8120955A0
IT8120955A0 IT8120955A IT2095581A IT8120955A0 IT 8120955 A0 IT8120955 A0 IT 8120955A0 IT 8120955 A IT8120955 A IT 8120955A IT 2095581 A IT2095581 A IT 2095581A IT 8120955 A0 IT8120955 A0 IT 8120955A0
Authority
IT
Italy
Prior art keywords
substation circuit
improved speaker
speaker
improved
substation
Prior art date
Application number
IT8120955A
Other languages
English (en)
Other versions
IT1139078B (it
Inventor
Gary Grantland
Larry A Woodworth
Original Assignee
Gte Automatic Electric Lab Inc
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 Gte Automatic Electric Lab Inc filed Critical Gte Automatic Electric Lab Inc
Publication of IT8120955A0 publication Critical patent/IT8120955A0/it
Application granted granted Critical
Publication of IT1139078B publication Critical patent/IT1139078B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • 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)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
IT20955/81A 1980-04-07 1981-04-06 Circuito di sottostazione ad altoparlante perfezionato IT1139078B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/137,702 US4309573A (en) 1980-04-07 1980-04-07 Loudspeaking substation circuit

Publications (2)

Publication Number Publication Date
IT8120955A0 true IT8120955A0 (it) 1981-04-06
IT1139078B IT1139078B (it) 1986-09-17

Family

ID=22478687

Family Applications (1)

Application Number Title Priority Date Filing Date
IT20955/81A IT1139078B (it) 1980-04-07 1981-04-06 Circuito di sottostazione ad altoparlante perfezionato

Country Status (4)

Country Link
US (1) US4309573A (it)
BE (1) BE886978A (it)
CA (1) CA1149091A (it)
IT (1) IT1139078B (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8200666A (nl) * 1982-02-19 1983-09-16 Philips Nv Transmissieschakeling voor een elektronisch telefoontoestel.
US4554411A (en) * 1983-01-24 1985-11-19 Scovill Inc. Intercom system
JPS63234654A (ja) * 1987-03-24 1988-09-29 Toshiba Corp 無線電話装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1303244A (it) * 1969-05-15 1973-01-17
US3881069A (en) * 1973-04-05 1975-04-29 Nitsuko Ltd Telephone call loudspeaker monitoring and relay control circuit

Also Published As

Publication number Publication date
US4309573A (en) 1982-01-05
BE886978A (fr) 1981-05-04
IT1139078B (it) 1986-09-17
CA1149091A (en) 1983-06-28

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