CH228093A - Device for amplifying the speech currents in a telephone subscriber station. - Google Patents

Device for amplifying the speech currents in a telephone subscriber station.

Info

Publication number
CH228093A
CH228093A CH228093DA CH228093A CH 228093 A CH228093 A CH 228093A CH 228093D A CH228093D A CH 228093DA CH 228093 A CH228093 A CH 228093A
Authority
CH
Switzerland
Prior art keywords
amplifying
subscriber station
telephone subscriber
speech currents
speech
Prior art date
Application number
Other languages
German (de)
Inventor
Bell Telephone Manufac Anonyme
Original Assignee
Bell Telephone Mfg
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 Bell Telephone Mfg filed Critical Bell Telephone Mfg
Publication of CH228093A publication Critical patent/CH228093A/en

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
CH228093D 1936-11-20 1937-11-17 Device for amplifying the speech currents in a telephone subscriber station. CH228093A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE228093X 1936-11-20

Publications (1)

Publication Number Publication Date
CH228093A true CH228093A (en) 1943-07-31

Family

ID=3866209

Family Applications (1)

Application Number Title Priority Date Filing Date
CH228093D CH228093A (en) 1936-11-20 1937-11-17 Device for amplifying the speech currents in a telephone subscriber station.

Country Status (5)

Country Link
BE (1) BE418493A (en)
CH (1) CH228093A (en)
FR (1) FR829576A (en)
GB (1) GB493668A (en)
NL (1) NL49768C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE965133C (en) * 1953-10-11 1957-06-06 Telefonbau & Normalzeit Gmbh Circuit arrangement for preferred call stations in telephone systems with dialer operation
DE1141681B (en) * 1961-04-07 1962-12-27 Huettenwerk Oberhausen Ag Telephone subscriber circuit for line dialing systems with speakerphone

Also Published As

Publication number Publication date
BE418493A (en)
NL49768C (en)
FR829576A (en) 1938-06-30
GB493668A (en) 1938-10-12

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