US3649933A - Electromechanical apparatus for producing artifical reverberation - Google Patents

Electromechanical apparatus for producing artifical reverberation Download PDF

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Publication number
US3649933A
US3649933A US79995A US3649933DA US3649933A US 3649933 A US3649933 A US 3649933A US 79995 A US79995 A US 79995A US 3649933D A US3649933D A US 3649933DA US 3649933 A US3649933 A US 3649933A
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spring
turn
wound coil
frame
electromechanical
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US79995A
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English (en)
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Werner Fidi
Franz Srb
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    • 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
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/08—Arrangements for producing a reverberation or echo sound
    • G10K15/10—Arrangements for producing a reverberation or echo sound using time-delay networks comprising electromechanical or electro-acoustic devices

Definitions

  • ABSTRACT In electromechanical apparatus, which includes a helical
  • Foreign Appliuitlon Priority Data spring as a delay item for producing artificial reverberation, a Oct. 22, 1969 Austria ..A 9967/69
  • Name element a isfigidly P' least one turn of the spring at a point intermediate the ends of the spring without interrupting its continuity.
  • the movable US. Cl. "333/? R, 179/1 J, 310/15 element is a rotatable frame wound coil and the connection is [51 1.
  • the present invention is directed to electromechanical apparatus including a helical spring which acts as a delay ele ment for producing artificial reverberation and, more particularly, it is directed to the use of electromechanical transducers including a movable element rigidly connected to the spring at the point intermediate the ends of the spring. The transducers apply mechanical vibrations to the spring and pick up the vibrations transmitting by the spring.
  • an electromechanical transducer is disposed at each end of the helical spring.
  • at least one transducer is disposed at each end of the helical spring.
  • the pickup transducer is not disposed at an end of the helical spring but is located intermediate the ends of the spring.
  • the continuity of the spring is interrupted by a movable element, usually a rotatable frame-wound .coil, of the transducer which is coupled to the spring. It is essential for reliable functioning of such a reverberation apparatus that no reflections, or only slight reflections, occur at the location at which the transducer is inserted, otherwise the desired live impression of the reverberation would be disturbed.
  • the present invention provides electromechanical apparatus for producing artificial reverberation, including a helical spring which functions as a delay element, and electromechanical transducers for applying mechanical vibrations to the spring and for picking up the vibrations transmitted by the spring.
  • electromechanical apparatus for producing artificial reverberation, including a helical spring which functions as a delay element, and electromechanical transducers for applying mechanical vibrations to the spring and for picking up the vibrations transmitted by the spring.
  • at least one of the transducers is coupled to the spring intermediate the ends of the spring by a movable element of the transducer which is rigidly connected to at least one turn of the spring without any interruption to the continuity of the spring at the connection.
  • the movable element of the transducer coupled to the spring intermediate the ends of the spring is a rotatable frame-wound coil.
  • a connection between at least one turn of the spring and the rotatable frame is made directly to a side of the frame which is parallel to the axis of rotation of the frame.
  • the side of the frame may be arranged inside or outside the turn or turns to which it is connected.
  • the connection is made by means of a hard, nonelastic adhesive.
  • each turn of the spring connected to the rotatable frame is deformed inwardly, so that the polar moment of inertia of the deformed turn plus the rotatable frame is at least approximately equal to that of turns not connected to the rotatable frame-wound coil.
  • each deformed spring turn should be provided with a reduced portion or notch which results in a corresponding reduction in its stiffness.
  • FIG. 1 a known reverberation apparatus is illustrated and is provided with a helical spring S which is subdivided into two portions S1 and S2.
  • a rotatable frame-wound coil D2 of a pick up transducer is positioned between the two axially spaced helical spring portions S1 and S2 in the magnetic field of a magnet system M2 having poles PN2, PS2.
  • An input transducer having a rotatable frame-wound coil D1 is disposed between the poles PNI, PS1 of a magnet system Ml, however, it is located at one end of the helical spring and the spring is supported at that end to the point A by the frame-wound coil D1 and a suspension F1, and it is supported at the other end to a fixed point B via the suspension F2.
  • the mode of connection of the coil D2 results in a discontinuity in the helical spring which gives rise to disturbance.
  • the rotatable frame-sound coil D2 of the embodiment of the invention shown in FIG. 2 is positioned within the helical spring, one turn of the spring is rigidly connected at two oppositely disposed points 1 and 2 to the two sides of the coil D2 which are parallel to the axis of rotation of the coil.
  • the connection of the coil to the spring is effected by adhesive attachment and must be as rigid as possible to insure that the frame-wound coil is reliably driven by the vibrating spring turn. Accordingly, adhesives of an elastic nature should be avoided, and hard, nonelastic adhesives should be used.
  • the magnet system M2 (not shown in FIG. 2) is arranged so that the spring, that is to say the part thereof surrounding the frame-wound coil D2, is also disposed in the air gap between the poles PN2, PS2.
  • FIG. 3 the alternative embodiment illustrated in FIG. 3 may be used.
  • the spring turn is deformed inwardly at two oppositely disposed positions, but instead of inserting the frame-wound coil D2 within the spring as in FIG. 2, the frame is applied over the spring turn so that the frame is practically suspended on the spring turn.
  • the frame-wound coil D2 is attached to the spring turn at points 1 and 2 by means of rigid adhesive.
  • the frame-wound coil D2 is adhesively attached to two adjacent turns of the spring at the four points 3, 4, 5 and 6.
  • each of the deformed turns is notched or provided with reduced portions to insure that the stiffness of each deformed turn plus the frame attached to it is equal to the stiffness of the undeformed turns of the spring.
  • each embodiment of the invention offers the further advantage of preventing any tensile forces of the spring from acting upon the frame and deformation thereof is therefore obviated. Accordingly, a construction of lighter weightmay be adopted.
  • the invention has been described only in relation to an electromechanical transducer having a rotatable frame-wound coil because, in addition to a high degree of efficiency, this construction provides for precise and controllable conditions.
  • the apparatus responds only to torsional vibrations, proportionally to the homogeneity of the magnetic field and can also fundamentally employ electromechanical transducers which are provided with movable elements such as moving iron elements, moving magnets or the like.
  • Electromechanical apparatus for producing artificial reverberation comprising an elongated helical spring which operates as a delay element, and electromechanical transducers for applying mechanical vibrations to the springand for picking up the vibrations transmitted by the spring, at least one of said transducers comprising a movable element being rigidly connected to at least one turn of said helical spring at a position intermediate the ends of the spring and without any interruption in the continuity of said spring at the connection for coupling said transducer to said spring, said movable element of said transducer coupled to said spring intermediate the ends thereof being a rotatable frame-wound coil, the connection between at least one turn of said spring and said rotatable frame-wound coil being made directly to a side of the frame-wound coil which is disposed in parallel relationship to the axis of rotation of said coil.
  • Electromechanical apparatus as set forth in claim 1,
  • Electromechanical apparatus as set forth in claim 1, wherein said frame-wound coil being disposed outside the turn of said spring to which it is connected.
  • Electromechanical apparatus for producing artificial reverberation comprising an elongated helical spring which operates as a delay element, and electromechanical transducers for applying mechanical vibrations to the spring and for picking up the vibrations transmitted by the spring, at least one of said transducers comprising a movable element being rigidly connected to at least one turn of said helical spring at a position intennediate the ends of the spring and without any interruption in the continuity of said spring at the connection for coupling said transducer to said spring, said movable element of said transducer coupled to said spring intermediate the ends thereof being a rotatable frame-wound coil, the portion of each turn of said spring connected to said rotatable frame-wound coil being deformed inwardly whereby the polar moment of inertia of each said deformed turn plus said rotatable frame-wound coil connected thereto is at least approximately equal to the polar moment of inertia of the remaining undeforrned turns of said spring.
  • Electromechanical apparatus as set forth in claim 5 wherein each inwardly deformed turn of said spring being provided with reduced portions so that the stiffness of each said deformed turn plus said frame-wound coil connected thereto IS equal to the stiffness of the remaining undefonned turns of said spring.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
US79995A 1969-10-22 1970-10-12 Electromechanical apparatus for producing artifical reverberation Expired - Lifetime US3649933A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT996769A AT294450B (de) 1969-10-22 1969-10-22 Elektromechanische Einrichtung zur Erzeugung künstlichen Nachhalles

Publications (1)

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US3649933A true US3649933A (en) 1972-03-14

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US79995A Expired - Lifetime US3649933A (en) 1969-10-22 1970-10-12 Electromechanical apparatus for producing artifical reverberation

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US (1) US3649933A (en:Method)
AT (1) AT294450B (en:Method)
AU (1) AU2019670A (en:Method)
BE (1) BE757813A (en:Method)
CH (1) CH513553A (en:Method)
DE (1) DE2050879A1 (en:Method)
FR (1) FR2080334A5 (en:Method)
GB (1) GB1289055A (en:Method)
NL (1) NL7014832A (en:Method)
SE (1) SE358788B (en:Method)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112396A (en) * 1975-02-17 1978-09-05 Chuzo Honda Echo annexation device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1852795A (en) * 1928-10-24 1932-04-05 Bell Telephone Labor Inc Wave transmission device
US2959747A (en) * 1957-10-11 1960-11-08 Elgin Nat Watch Co Electromotive vibrator and oscillator systems

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1852795A (en) * 1928-10-24 1932-04-05 Bell Telephone Labor Inc Wave transmission device
US2959747A (en) * 1957-10-11 1960-11-08 Elgin Nat Watch Co Electromotive vibrator and oscillator systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112396A (en) * 1975-02-17 1978-09-05 Chuzo Honda Echo annexation device

Also Published As

Publication number Publication date
GB1289055A (en:Method) 1972-09-13
AU2019670A (en) 1972-03-23
DE2050879A1 (de) 1971-04-29
AT294450B (de) 1971-11-25
FR2080334A5 (en:Method) 1971-11-12
CH513553A (de) 1971-09-30
BE757813A (fr) 1971-04-01
SE358788B (en:Method) 1973-08-06
NL7014832A (en:Method) 1971-04-26

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