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GB202268A - Improvements in sound transmitting devices for use in connexion with the use of telephone receivers - Google Patents

Improvements in sound transmitting devices for use in connexion with the use of telephone receivers

Info

Publication number
GB202268A
GB202268A GB3262/23A GB326223A GB202268A GB 202268 A GB202268 A GB 202268A GB 3262/23 A GB3262/23 A GB 3262/23A GB 326223 A GB326223 A GB 326223A GB 202268 A GB202268 A GB 202268A
Authority
GB
United Kingdom
Prior art keywords
connexion
transmitting devices
sound transmitting
telephone receivers
earpiece
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB3262/23A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB202268A publication Critical patent/GB202268A/en
Expired legal-status Critical Current

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
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)

Abstract

202,268. Andersen, M. G. Aug. 8, 1922, [Convention date]. Earpieces and attachments. - A device by which a third person may listen to a telephone conversation consists of a member a, adapted to be placed in the ear to which a telephone receiver is held and connected by a flexible tube b to an earpiece c. The member a consists of a semicircular perforated disc, and is placed in the lower part of the external ear. The member a of a second apparatus may be placed within the earpiece c, or several tubes may be led from the one member a.
GB3262/23A 1922-08-08 1923-02-03 Improvements in sound transmitting devices for use in connexion with the use of telephone receivers Expired GB202268A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK202268X 1922-08-08

Publications (1)

Publication Number Publication Date
GB202268A true GB202268A (en) 1923-10-18

Family

ID=8149913

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3262/23A Expired GB202268A (en) 1922-08-08 1923-02-03 Improvements in sound transmitting devices for use in connexion with the use of telephone receivers

Country Status (4)

Country Link
DE (1) DE387900C (en)
FR (1) FR562185A (en)
GB (1) GB202268A (en)
NL (1) NL13467C (en)

Also Published As

Publication number Publication date
DE387900C (en) 1924-01-09
FR562185A (en) 1923-11-05
NL13467C (en)

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