BR7902952A - Arranjo de circuitos para protecao contra escuta clandestina em instalacoes comutadas por voz,do tipo de"maos livres",particularmente em aparelhos telefonicos - Google Patents

Arranjo de circuitos para protecao contra escuta clandestina em instalacoes comutadas por voz,do tipo de"maos livres",particularmente em aparelhos telefonicos

Info

Publication number
BR7902952A
BR7902952A BR7902952A BR7902952A BR7902952A BR 7902952 A BR7902952 A BR 7902952A BR 7902952 A BR7902952 A BR 7902952A BR 7902952 A BR7902952 A BR 7902952A BR 7902952 A BR7902952 A BR 7902952A
Authority
BR
Brazil
Prior art keywords
circuits
arrangement
type
protection against
hands free
Prior art date
Application number
BR7902952A
Other languages
English (en)
Inventor
H Wiedmann
Original Assignee
Int Standard Electric Corp
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 Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of BR7902952A publication Critical patent/BR7902952A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)
  • Emergency Alarm Devices (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
BR7902952A 1978-05-20 1979-05-14 Arranjo de circuitos para protecao contra escuta clandestina em instalacoes comutadas por voz,do tipo de"maos livres",particularmente em aparelhos telefonicos BR7902952A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782822069 DE2822069C2 (de) 1978-05-20 1978-05-20 Schaltungsanordnung für einen Abhörschutz bei sprachgesteuerten Freisprecheinrichtungen, insbesondere in Fernsprechapparaten

Publications (1)

Publication Number Publication Date
BR7902952A true BR7902952A (pt) 1979-11-27

Family

ID=6039819

Family Applications (1)

Application Number Title Priority Date Filing Date
BR7902952A BR7902952A (pt) 1978-05-20 1979-05-14 Arranjo de circuitos para protecao contra escuta clandestina em instalacoes comutadas por voz,do tipo de"maos livres",particularmente em aparelhos telefonicos

Country Status (4)

Country Link
BR (1) BR7902952A (pt)
DE (1) DE2822069C2 (pt)
GB (1) GB2021355B (pt)
IE (1) IE48335B1 (pt)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1181541A (en) * 1982-05-21 1985-01-22 Mitel Corporation Loudspeaking telephone

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE339704B (pt) * 1970-12-22 1971-10-18 Ericsson Telefon Ab L M

Also Published As

Publication number Publication date
DE2822069C2 (de) 1986-02-20
DE2822069A1 (de) 1979-11-22
GB2021355B (en) 1982-06-03
IE48335B1 (en) 1984-12-12
GB2021355A (en) 1979-11-28
IE790973L (en) 1979-11-20

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