GB184988A - Improvements in and relating to gramophones - Google Patents

Improvements in and relating to gramophones

Info

Publication number
GB184988A
GB184988A GB2029721A GB2029721A GB184988A GB 184988 A GB184988 A GB 184988A GB 2029721 A GB2029721 A GB 2029721A GB 2029721 A GB2029721 A GB 2029721A GB 184988 A GB184988 A GB 184988A
Authority
GB
United Kingdom
Prior art keywords
gramophones
relating
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
GB2029721A
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.)
Montgomery Mac Donald & Compan
Original Assignee
Montgomery Mac Donald & Compan
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 Montgomery Mac Donald & Compan filed Critical Montgomery Mac Donald & Compan
Priority to GB2029721A priority Critical patent/GB184988A/en
Publication of GB184988A publication Critical patent/GB184988A/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
    • H04R1/38—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 in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
GB2029721A 1921-07-28 1921-07-28 Improvements in and relating to gramophones Expired GB184988A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2029721A GB184988A (en) 1921-07-28 1921-07-28 Improvements in and relating to gramophones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2029721A GB184988A (en) 1921-07-28 1921-07-28 Improvements in and relating to gramophones

Publications (1)

Publication Number Publication Date
GB184988A true GB184988A (en) 1922-08-31

Family

ID=10143630

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2029721A Expired GB184988A (en) 1921-07-28 1921-07-28 Improvements in and relating to gramophones

Country Status (1)

Country Link
GB (1) GB184988A (en)

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