IE48335B1 - Hands-free facility - Google Patents

Hands-free facility

Info

Publication number
IE48335B1
IE48335B1 IE97379A IE97379A IE48335B1 IE 48335 B1 IE48335 B1 IE 48335B1 IE 97379 A IE97379 A IE 97379A IE 97379 A IE97379 A IE 97379A IE 48335 B1 IE48335 B1 IE 48335B1
Authority
IE
Ireland
Prior art keywords
circuit
amplifier
variable
gain
hands
Prior art date
Application number
IE97379A
Other languages
English (en)
Other versions
IE790973L (en
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 IE790973L publication Critical patent/IE790973L/xx
Publication of IE48335B1 publication Critical patent/IE48335B1/en

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)
IE97379A 1978-05-20 1979-08-08 Hands-free facility IE48335B1 (en)

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 (2)

Publication Number Publication Date
IE790973L IE790973L (en) 1979-11-20
IE48335B1 true IE48335B1 (en) 1984-12-12

Family

ID=6039819

Family Applications (1)

Application Number Title Priority Date Filing Date
IE97379A IE48335B1 (en) 1978-05-20 1979-08-08 Hands-free facility

Country Status (4)

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

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 (de) * 1970-12-22 1971-10-18 Ericsson Telefon Ab L M

Also Published As

Publication number Publication date
BR7902952A (pt) 1979-11-27
GB2021355B (en) 1982-06-03
DE2822069C2 (de) 1986-02-20
DE2822069A1 (de) 1979-11-22
GB2021355A (en) 1979-11-28
IE790973L (en) 1979-11-20

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