CH288283A - Verstärkungsvorrichtung zur Verwendung mit einem Mikrotelephon eines Telephonapparates. - Google Patents

Verstärkungsvorrichtung zur Verwendung mit einem Mikrotelephon eines Telephonapparates.

Info

Publication number
CH288283A
CH288283A CH288283DA CH288283A CH 288283 A CH288283 A CH 288283A CH 288283D A CH288283D A CH 288283DA CH 288283 A CH288283 A CH 288283A
Authority
CH
Switzerland
Prior art keywords
microphone
telephone set
amplifying device
amplifying
telephone
Prior art date
Application number
Other languages
German (de)
English (en)
Inventor
Sydney Branson John Charles
Clifford Branson Leslie
Original Assignee
Sydney Branson John Charles
Clifford Branson Leslie
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 Sydney Branson John Charles, Clifford Branson Leslie filed Critical Sydney Branson John Charles
Publication of CH288283A publication Critical patent/CH288283A/de

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/21—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
    • H04M1/215—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads by non-intrusive coupling means, e.g. acoustic couplers
    • H04M1/2155—Acoustic coupling
    • 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
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/62—Constructional arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Coils Or Transformers For Communication (AREA)
CH288283D 1950-06-08 1950-11-22 Verstärkungsvorrichtung zur Verwendung mit einem Mikrotelephon eines Telephonapparates. CH288283A (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1427050A GB684633A (en) 1950-06-08 1950-06-08 Improvements in or relating to amplifying devices for use with telephone apparatus

Publications (1)

Publication Number Publication Date
CH288283A true CH288283A (de) 1953-01-15

Family

ID=10038122

Family Applications (1)

Application Number Title Priority Date Filing Date
CH288283D CH288283A (de) 1950-06-08 1950-11-22 Verstärkungsvorrichtung zur Verwendung mit einem Mikrotelephon eines Telephonapparates.

Country Status (3)

Country Link
BE (1) BE499477A (is")
CH (1) CH288283A (is")
GB (2) GB646589A (is")

Also Published As

Publication number Publication date
BE499477A (is")
GB684633A (en) 1952-12-24
GB646589A (en) 1950-11-22

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