GB614638A - Improvements in and relating to loudspeaking telephone systems - Google Patents

Improvements in and relating to loudspeaking telephone systems

Info

Publication number
GB614638A
GB614638A GB730146A GB730146A GB614638A GB 614638 A GB614638 A GB 614638A GB 730146 A GB730146 A GB 730146A GB 730146 A GB730146 A GB 730146A GB 614638 A GB614638 A GB 614638A
Authority
GB
United Kingdom
Prior art keywords
loudspeaker
casing
microphone
outer casing
opening
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
GB730146A
Other languages
English (en)
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
Priority to BE471744D priority Critical patent/BE471744A/xx
Application filed by Individual filed Critical Individual
Priority to GB730146A priority patent/GB614638A/en
Priority to FR942664D priority patent/FR942664A/fr
Publication of GB614638A publication Critical patent/GB614638A/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
    • H04M1/60—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)
GB730146A 1946-03-08 1946-03-08 Improvements in and relating to loudspeaking telephone systems Expired GB614638A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE471744D BE471744A (enrdf_load_stackoverflow) 1946-03-08
GB730146A GB614638A (en) 1946-03-08 1946-03-08 Improvements in and relating to loudspeaking telephone systems
FR942664D FR942664A (fr) 1946-03-08 1947-03-05 Perfectionnements au système de communication téléphonique

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
GB614638A true GB614638A (en) 1948-12-20

Family

ID=9830490

Family Applications (1)

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

Country Status (3)

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

Cited By (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

Cited By (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
FR942664A (fr) 1949-02-15
BE471744A (enrdf_load_stackoverflow)

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