US3695385A - Variable distance doppler generator - Google Patents

Variable distance doppler generator Download PDF

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Publication number
US3695385A
US3695385A US147022A US3695385DA US3695385A US 3695385 A US3695385 A US 3695385A US 147022 A US147022 A US 147022A US 3695385D A US3695385D A US 3695385DA US 3695385 A US3695385 A US 3695385A
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United States
Prior art keywords
sound
speaker
pulsato
reflector
opening
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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
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US147022A
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English (en)
Inventor
Paul H Sharp
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.)
CBS Broadcasting Inc
Marmon Co
Original Assignee
Columbia Broadcasting System Inc
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Assigned to MARMON COMPANY reassignment MARMON COMPANY CONDITIONAL ASSIGNMENT (SEE DOCUMENT FOR DETAILS). Assignors: CBS INC.
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Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/02—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos
    • G10H1/04—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos by additional modulation
    • G10H1/043—Continuous modulation
    • G10H1/047—Continuous modulation by acousto-mechanical means, e.g. rotating speakers or sound deflectors

Definitions

  • ABSTRACT A plurality of acoustic pulsato units are mounted in a vertical stack with the axes of the pulsato rotors horizontal in spaced parallel array. Reflector walls on opposite sides not only direct the sound frontally but also serve as the primary means for producing frequency deviations by Doppler effect since the distance. between the reflector walls and the mouths of the sound channels changes in accordance with the angular movement of the rotors. Pulsato sound at a high energy level is efficiently radiated.
  • acoustic instruments such as trumpets and trombones are capable of producing extremely loud sounds.
  • An electronic instrument such as an organ or electric guitar played in concert with an acoustic instrument suchas a trumpet, requires a high level of amplification.
  • High powers have been achieved by driving a plurality of speakers from a common high power amplifier. As many as ten speakers may be more or less compactly mounted in a common cabinet.
  • Theprimary object of the present invention is to provide'a relatively compact pulsato speaker capable of efficiently producing high sound levels.
  • a reflector Whereas a conventional reflector produces a beam from a fixed localized source, the present reflector produces a beam from a moving source with the distance between the reflector wall and the source changing so that a cyclic Doppler or pulsato effect is thereby created.
  • the reflector thus performs a unique combined function of channelling sound energy as well as producing a full vibrant pulsato effect.
  • the reflector in one form of the invention comprises two wing plates at opposite sides of a speaker mounting panel, the plates being angled at about 45.
  • the pulsato rotors are mounted in front of the common mounting panel there being a stationary speaker for each rotor mounted in back of the panel.
  • a plurality of pulsato drums are coaxially stacked along the axis of the reflector. Each drum in this instance carries a speaker for rotation therewith. In both forms, not only is acoustic efficiency maximized, but the pulsato effect is greatly enhanced.
  • FIG. 1 is a pictorial view of a speaker system incorporating the present invention.
  • FIG. 2 is an enlarged transverse sectional view taken along a plane corresponding to line 2-2 of FIG. 1.
  • FIG. 3 is a vertical sectional view taken along a plane corresponding to line 3-3 of FIG. 2.
  • FIG. 4 is a fragmentary front elevational view of the speaker system shoiving the stack of rotors.
  • FIG. 5 is a further enlarged fragmentary sectional view taken along a plane corresponding to line 5-5 of FIG. 2.
  • FIG. 6 is an isometric view of a modified form of the present invention.
  • FIG. 7 is a top plan view of the speaker system of FIG. 6.
  • FIG. 8 is a frontelevational view thereof with part of the cabinet structure being broken away and shown in section.
  • FIG. 9 is a sectional view taken along a plane corresponding to line 9-9 of FIG. 8.
  • the panel 18 is enclosed within a cabinet which comprises the top wall 20, a bottom wall 22, and side walls 24 and 26 (see also FIG. 2) and a rear wall 28.
  • the speaker mounting panel 18 is recessed within the frontal opening of the cabinet structure with its top and bottom edges respectively abutting the inner surfaces of the top and bottom walls 20 and 22.
  • An enclosure for the speakers is completed by a pair of reflector panels or walls 30 and 32.
  • One reflector wall 30, for example (FIG. 2) extends inwardly from the front vertical side edge of the cabinet opening at an angle of approximately 45 to the corresponding side of the speaker mounting panel 18.
  • the other reflector wall 32 similarly extends from the vertical side edge of the cabinet opening to the corresponding side of the panel 18. The sound is accordingly beamed frontally to maximize acoustic efficiency.
  • the speakers may all be driven by the electrical output of a musical instrument such as an electric organ, electric guitar, or the like.
  • Amplifiers may conveniently be housed in the bottom of the enclosure behind the reflectors 30 and 32.
  • the axes a, b, c and d of the speakers 10, 12, 14 and 16 are horizontal and vertically spaced one above the other, the speakers facing frontally of the cabinet opening.
  • four openings are provided in the panel 18, one of which 34 is shown in FIG. 5.
  • Each opening is a composite, comprising a plurality of smaller openings.
  • the smaller openings together form a circular array providing a spider supporting a central hub 36.
  • the speaker 10 is mounted upon a U-shaped bracket 38 attached to the panel 18 behind the opening 34.
  • a cylindrical section 39 attached to the inside of the bracket 38 channels the sound from the speaker 10 to the region adjacent to composite opening 34.
  • the sounds passing through the opening 34 are acted upon by a pulsato rotor 40 mounted in front of the speaker panel 18.
  • the pulsato rotor 40 in this instance is of a type shown and described in Schillerer U.S. Pat. No. 3,3l5,760 issued Apr. 25, 1967, and entitled ACOUSTIC DAMPING DRIVE FOR PULSATO R TOR.
  • the pulsato rotor 40 is mounted coaxially of the corresponding speaker 10.
  • a pair of bearings are provided for opposite ends of the rotor, one of the'bearings (not shown) being mounted upon a U-shaped bracket 42 (FIG. I) that straddles the rotor.
  • a shaft 44 mounted by the bearings mounts the pulsato rotor 40.
  • a pulley 46 is carried upon an inward extension of the shaft 34.
  • a motor 48 (FIG. 2) on the inside of the panel 18 drives the pulley 46 through a belt 50.
  • the rotor 40 rotates the sound pattern in such manner that the sound-pattern is repeated at the rate of 5 to 8 cycles per second.
  • the rotor 40 channels the sound to an opening that moves orbitally.
  • the pulsato rotor 40 thus has a channel with throat region 52 (FIG. 5) at the rotor side registering with the panel opening 34.
  • the channel has a lateral mouth 54 (see also FIGS. 1, 2 and 4) that describes a circular orbit.
  • Similar pulsato rotors 56, 58 and 60 are provided for the other three speakers l2, l4 and 16. Each pulsato rotor is provided with its own motor drive located on the inside of the panel. The rotors need not be synchronized.
  • the side reflectors panels 32 and 34 cooperate with the pulsato rotors to produce a substantial distance deviation even for a listener situated directly in front of the cabinet.
  • the distance between the mouth 54 and either one of the reflector panels changes cyclically byfan amount corresponding to the diameter of the pulsato rotor. Accordingly full rich pulsato effect is restored even though the rotors themselves are compactly oriented and mounted in a simple manner.
  • a plurality of pulsato drums 80, 82, 84 and 86 are mounted for rotation about a common vertical axis by the aid of a shaft 88. Inside each drum is a speaker that provides a radially outwardly opening sound channelfThe'shaft 88 is rotated by a motor 90, pulleys 92, 94 and a flexible belt 96 all housed beneath a horizontal partition 98 in a cabinet structure 100.
  • the cabinet structure includes a reflector 102 having a simple generally parabolic curvature. Like panels 30 and 32 of the previous form, the curved reflector 102 not only beams the sound for maximum efficiency but it also cooperates with the speaker channels to enhance the pulsato effect by virtue of the fact that the distance between the reflector 102 and the opening of the sound channel is cyclically changing. The sound intensity is maximized for a given unit of power.
  • a speaker cabinet having a frontal opening, said speaker cabinet having reflector means at the op posite sides of said opening that are angled with respect to each other for beaming sound waves to an audience;
  • a sound channel rotatable about an axis and having a sound emitting opening spaced from said axis to describe an orbit
  • motor means for rotating said sound channel at a rate to repeat the sound radiation pattern at a desired rate
  • a speaker cabinet having a frontal opening, said speaker cabinet having reflector means at the opposite sides of said opening that are angled with respect to each other for beaming sound waves to an audience;
  • b. means forming a plurality of individual sound channels each rotatable about an axis and each having a sound emitting opening spaced from its axis to describe an orbit;
  • said reflector means comprises a pair of angled wing panels adjoining the sides of said speaker mounting panel.
  • a speaker cabinet having a front opening
  • motor means for rotating said pulsato rotors to repeat the sound radiation patterns produced by each at a desired rate whereby said sound openings move toward and away from said reflectors by an amount corresponding to the orbits of said sound openings.
  • each rotor has its own motor located behind the mounting panel.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Stereophonic Arrangements (AREA)
US147022A 1971-05-26 1971-05-26 Variable distance doppler generator Expired - Lifetime US3695385A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14702271A 1971-05-26 1971-05-26

Publications (1)

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US3695385A true US3695385A (en) 1972-10-03

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Application Number Title Priority Date Filing Date
US147022A Expired - Lifetime US3695385A (en) 1971-05-26 1971-05-26 Variable distance doppler generator

Country Status (7)

Country Link
US (1) US3695385A (it)
BE (1) BE783903A (it)
CA (1) CA944696A (it)
DE (1) DE2224950A1 (it)
GB (1) GB1371848A (it)
IT (1) IT958032B (it)
NL (1) NL7207035A (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4215664A (en) * 1977-09-05 1980-08-05 Motorenfabrik Hatz Gmbh & Co. Kg Internal combustion engine with a sound-proofing shell
WO2005104617A1 (en) * 2004-04-23 2005-11-03 Stroembaeck Lars Acoustic element
US9769561B1 (en) 2016-09-02 2017-09-19 Murray R. Clark Rotating speaker array
CN108269470A (zh) * 2018-03-02 2018-07-10 贺宜琛 一种应用于多普勒效应的实验装置和实现系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2355318C2 (de) * 1973-11-06 1983-04-28 Thomas Dr.-Ing. 8504 Stein Kühl Bauelementesatz für eine elektroakustische Wiedergabevorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3057430A (en) * 1959-05-28 1962-10-09 Rototone Inc Rotatable acoustical apparatus
US3070660A (en) * 1961-05-29 1962-12-25 Wurlitzer Co Rotary electrical apparatus
US3315760A (en) * 1966-04-12 1967-04-25 Columbia Broadcasting Syst Inc Acoustic damping drive for pulsato rotor
US3495022A (en) * 1966-11-14 1970-02-10 Chicago Musical Instr Co Tremolant mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3057430A (en) * 1959-05-28 1962-10-09 Rototone Inc Rotatable acoustical apparatus
US3070660A (en) * 1961-05-29 1962-12-25 Wurlitzer Co Rotary electrical apparatus
US3315760A (en) * 1966-04-12 1967-04-25 Columbia Broadcasting Syst Inc Acoustic damping drive for pulsato rotor
US3495022A (en) * 1966-11-14 1970-02-10 Chicago Musical Instr Co Tremolant mechanism

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4215664A (en) * 1977-09-05 1980-08-05 Motorenfabrik Hatz Gmbh & Co. Kg Internal combustion engine with a sound-proofing shell
WO2005104617A1 (en) * 2004-04-23 2005-11-03 Stroembaeck Lars Acoustic element
US20070230720A1 (en) * 2004-04-23 2007-10-04 Lars Stromback Acoustic Element
US9654862B2 (en) 2004-04-23 2017-05-16 Lars Strömbäck Acoustic element
US9769561B1 (en) 2016-09-02 2017-09-19 Murray R. Clark Rotating speaker array
CN108269470A (zh) * 2018-03-02 2018-07-10 贺宜琛 一种应用于多普勒效应的实验装置和实现系统
CN108269470B (zh) * 2018-03-02 2024-03-08 贺宜琛 一种应用于多普勒效应的实验装置和实现系统

Also Published As

Publication number Publication date
BE783903A (fr) 1972-09-18
IT958032B (it) 1973-10-20
GB1371848A (en) 1974-10-30
DE2224950A1 (de) 1972-12-14
CA944696A (en) 1974-04-02
NL7207035A (it) 1972-11-28

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AS Assignment

Owner name: MARMON COMPANY, 39 SOUTH LASALLE ST., CHICAGO, IL.

Free format text: CONDITIONAL ASSIGNMENT;ASSIGNOR:CBS INC.;REEL/FRAME:003844/0106

Effective date: 19810306