GB641668A - Sound reproduction devices - Google Patents

Sound reproduction devices

Info

Publication number
GB641668A
GB641668A GB25537/47A GB2553747A GB641668A GB 641668 A GB641668 A GB 641668A GB 25537/47 A GB25537/47 A GB 25537/47A GB 2553747 A GB2553747 A GB 2553747A GB 641668 A GB641668 A GB 641668A
Authority
GB
United Kingdom
Prior art keywords
loud
speaker
sound
sept
sound reproduction
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
GB25537/47A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB641668A publication Critical patent/GB641668A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

641,668. Sound-directing appliances. STANDARD TELEPHONES & CABLES, Ltd. Sept. 19, 1947, No. 25537. Convention date, Sept. 20, 1946. [Class 13] [Also in Group XXXIX] A cabinet containing a loud-speaker 21, Fig. 4, has louvres 1, of which a longitudinal view is given in Fig. 3, designed to concentrate the sound energy in a given direction. Acoustic screens 12, 13 may be provided in order to separate the loud-speaker from the amplifier &c. and to close the short path 15 for sound from the rear surface of the loud-speaker and lengthen the equivalent path between the two faces of the diaphragm. In a modification, Fig. 5, two walls 19, 20 form a phase changer to bring the waves from the rear of the loud-speaker into phase with those from the front. An alternative form of phase changer comprises two pipes, Fig. 6 (not shown).
GB25537/47A 1946-09-20 1947-09-19 Sound reproduction devices Expired GB641668A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR934810T 1946-09-20

Publications (1)

Publication Number Publication Date
GB641668A true GB641668A (en) 1950-08-16

Family

ID=9456418

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25537/47A Expired GB641668A (en) 1946-09-20 1947-09-19 Sound reproduction devices

Country Status (3)

Country Link
BE (1) BE478613A (en)
FR (1) FR934810A (en)
GB (1) GB641668A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847081A (en) * 1955-04-25 1958-08-12 Electronic Reproducers Inc Acoustical enclosure to simulate organ tones
US2979149A (en) * 1953-10-02 1961-04-11 Carlsson Stig Loudspeaker apparatus
US3080012A (en) * 1958-09-26 1963-03-05 Columbia Broadcasting Syst Inc Stereophonic loudspeaker arrays

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE943413C (en) * 1951-07-29 1956-05-17 Siemens Ag Loudspeaker arrangement, preferably with a funnel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2979149A (en) * 1953-10-02 1961-04-11 Carlsson Stig Loudspeaker apparatus
US2847081A (en) * 1955-04-25 1958-08-12 Electronic Reproducers Inc Acoustical enclosure to simulate organ tones
US3080012A (en) * 1958-09-26 1963-03-05 Columbia Broadcasting Syst Inc Stereophonic loudspeaker arrays

Also Published As

Publication number Publication date
FR934810A (en) 1948-06-02
BE478613A (en)

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