US1575951A - Acoustical instrument - Google Patents

Acoustical instrument Download PDF

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Publication number
US1575951A
US1575951A US757277A US75727724A US1575951A US 1575951 A US1575951 A US 1575951A US 757277 A US757277 A US 757277A US 75727724 A US75727724 A US 75727724A US 1575951 A US1575951 A US 1575951A
Authority
US
United States
Prior art keywords
diaphragm
area
sound
ratio
air
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 - Lifetime
Application number
US757277A
Other languages
English (en)
Inventor
Albert L Thuras
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 NL27036D priority Critical patent/NL27036C/xx
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to US757277A priority patent/US1575951A/en
Priority to GB23664/25A priority patent/GB266395A/en
Application granted granted Critical
Publication of US1575951A publication Critical patent/US1575951A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/08—Non-electric sound-amplifying devices, e.g. non-electric megaphones
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/001—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor with vibrating mechanical coupling means between pick-up element and sound producing element
    • 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 
    • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns

Definitions

  • This invention relates to acoustical instruments and has for an, object -an imroved sound passage for instruments used 1n the reception or transmission of sound.
  • the sound passage comprises a stationary wall through which is an opening leading to a sound deliverin'gmeans and a diaphragm movable toward and vaway from the stationmy wall through the medium of suitable means,vsuch, for example, as thestylus of a phonograph -'or the electromagnet of a telephone receiver;
  • the stationary wall of the sound box' is so shaped relative to the diaphragm that the instantaneous vibrational velocity of the air throughout the sound box is constant.
  • Fig. 1 is a section through .a phonograph sound box embodying the invention and Fig. 2 is a similar view of a modified form.
  • the sound box shown in Fig. 1 of the ber leads .to a suitable soun delivering means (not shown A, stylus .14 is con-.
  • a the radius of the iaphragm 12. Then for constant instantaneous vibrational velocity throughout the chamber of the face 11 may be obtained In sound producersthe term )(a:) ofthis equation is small or negligible compared to the term 93 Lama, v p 22; J af (2:)da: Integrating this equation for various values of :11 determines the shape of the inner wall 11.
  • the diaphragm 12 is of the plunger type and consequently its amplitude of v1- bration (d) is constant.
  • the rela tionship necessary to produce constant instantaneous vibrational velocity of air throughout the sound box is simplified.
  • the desired condition is obtainedwhere the ratio of the area of the annulus a; to the area of the opening 1), equals the ratio between the area of a and areas 'of the opening 6, and also equals the ratio of the efbeing 'sha vibrationa fective area of the diaphragmjto the area of the opening 13.
  • a sound; "chamber, and means for setting up sound vibrations in said chamber In an "acoustic apparatus, a sound; "chamber, and means for setting up sound vibrations in said chamber,.-sa1dchamber (1 to cause the instantaneous 2.
  • a sound box for, acoustical instruments jcomprisin a stationary wall having a delivery ori co and a diaphragm, the inner face ofthe' stationary wall bemg so shaped that the ratio of the voLume of air displaced by an annulusof the-diaphragm to the area of the opening through which the air is displaced equals the ratio'of the total volume of air d1s'placed by the diaphragm to the area of said delivery orifice.
  • a soundbox for acoustical instruments comprislnga stationary 'wall 'having a delivery orifice and a diaphragm, the inner.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US757277A 1924-12-20 1924-12-20 Acoustical instrument Expired - Lifetime US1575951A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL27036D NL27036C (enrdf_load_stackoverflow) 1924-12-20
US757277A US1575951A (en) 1924-12-20 1924-12-20 Acoustical instrument
GB23664/25A GB266395A (en) 1924-12-20 1925-09-22 Improvements in or relating to acoustic apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US757277A US1575951A (en) 1924-12-20 1924-12-20 Acoustical instrument

Publications (1)

Publication Number Publication Date
US1575951A true US1575951A (en) 1926-03-09

Family

ID=25047180

Family Applications (1)

Application Number Title Priority Date Filing Date
US757277A Expired - Lifetime US1575951A (en) 1924-12-20 1924-12-20 Acoustical instrument

Country Status (3)

Country Link
US (1) US1575951A (enrdf_load_stackoverflow)
GB (1) GB266395A (enrdf_load_stackoverflow)
NL (1) NL27036C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
NL27036C (enrdf_load_stackoverflow)
GB266395A (en) 1927-02-22

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