FR942664A - Perfectionnements au système de communication téléphonique - Google Patents

Perfectionnements au système de communication téléphonique

Info

Publication number
FR942664A
FR942664A FR942664DA FR942664A FR 942664 A FR942664 A FR 942664A FR 942664D A FR942664D A FR 942664DA FR 942664 A FR942664 A FR 942664A
Authority
FR
France
Prior art keywords
communication system
telephone communication
telephone
communication
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
Other languages
English (en)
French (fr)
Inventor
Leonard Ernest Ryall
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 filed Critical
Application granted granted Critical
Publication of FR942664A publication Critical patent/FR942664A/fr
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
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/62—Constructional arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • 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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Telephone Set Structure (AREA)
FR942664D 1946-03-08 1947-03-05 Perfectionnements au système de communication téléphonique Expired FR942664A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB730146A GB614638A (en) 1946-03-08 1946-03-08 Improvements in and relating to loudspeaking telephone systems

Publications (1)

Publication Number Publication Date
FR942664A true FR942664A (fr) 1949-02-15

Family

ID=9830490

Family Applications (1)

Application Number Title Priority Date Filing Date
FR942664D Expired FR942664A (fr) 1946-03-08 1947-03-05 Perfectionnements au système de communication téléphonique

Country Status (3)

Country Link
BE (1) BE471744A (lm)
FR (1) FR942664A (lm)
GB (1) GB614638A (lm)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102169A (en) * 1959-12-14 1963-08-27 Modern Telephones Great Britai Loudspeaking telephones

Also Published As

Publication number Publication date
GB614638A (en) 1948-12-20
BE471744A (lm)

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