EP0301059A1 - Dispositif de prise de son avec au moins deux micros ou instruments a cordes acoustiques, notamment pour guitares acoustiques. - Google Patents

Dispositif de prise de son avec au moins deux micros ou instruments a cordes acoustiques, notamment pour guitares acoustiques.

Info

Publication number
EP0301059A1
EP0301059A1 EP88901540A EP88901540A EP0301059A1 EP 0301059 A1 EP0301059 A1 EP 0301059A1 EP 88901540 A EP88901540 A EP 88901540A EP 88901540 A EP88901540 A EP 88901540A EP 0301059 A1 EP0301059 A1 EP 0301059A1
Authority
EP
European Patent Office
Prior art keywords
foam body
pickup device
microphones
foam
resonance
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.)
Granted
Application number
EP88901540A
Other languages
German (de)
English (en)
Other versions
EP0301059B1 (fr
Inventor
Von Maltzan Wolf-Ulri Freiherr
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.)
MALTZAN WOLF U FREIHERR VON
MALTZAN WOLF-U FREIHERR VON
Original Assignee
MALTZAN WOLF U FREIHERR VON
MALTZAN WOLF-U FREIHERR VON
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 claimed from DE8702014U external-priority patent/DE8702014U1/de
Priority claimed from DE8711963U external-priority patent/DE8711963U1/de
Application filed by MALTZAN WOLF U FREIHERR VON, MALTZAN WOLF-U FREIHERR VON filed Critical MALTZAN WOLF U FREIHERR VON
Priority to AT88901540T priority Critical patent/ATE81558T1/de
Publication of EP0301059A1 publication Critical patent/EP0301059A1/fr
Application granted granted Critical
Publication of EP0301059B1 publication Critical patent/EP0301059B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • G10H3/00—Instruments in which the tones are generated by electromechanical means
    • G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
    • G10H3/14—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means
    • G10H3/146—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means using a membrane, e.g. a drum; Pick-up means for vibrating surfaces, e.g. housing of an instrument
    • 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
    • G10H3/00—Instruments in which the tones are generated by electromechanical means
    • G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
    • G10H3/14—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means
    • G10H3/18—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means using a string, e.g. electric guitar

Definitions

  • the invention relates to a pickup device according to the preamble of claim 1 and represents a further development of the pickup according to the German utility model G 84 31 266.1, the so-called De Byl pickup.
  • the object of the invention is based on the vibration and resonance explanations in German Utility model G 84 31 266.1 to significantly improve the acoustic conditions when picking up an acoustic stringed instrument, especially an acoustic guitar. That is, the so-called de Byl effect is to be increased with a special design of the pickup device according to the invention, while at the same time an easier to handle and less expensive pickup device is sought.
  • Characteristics of claim 1 specified features and further by the features specified in the characterizing part of claim 11.
  • Advantageous further developments of the pickup device according to the invention result from patent claims 2 to 10 and 12 to 16.
  • a foam material with open pores is used, which due to its pore size and standard hardness has very specific acoustic properties and shields against sound from outside through the sound hole.
  • the wedge-shaped pointer integrated into the top shows the installation position or the angle at which the "De Byl” or the system of microphone capsules has the best acoustic properties.
  • the optimal position is set when the pointer is parallel to the guitar strings and the wedge tip is facing the guitar neck.
  • the foam body consists of two parts (horizontal division), whereby the upper part is provided with a central hole, which is used to hold a metal socket in which the electronics are housed »After inserting this socket and the one connected to it via cable Microphone capsules are glued together in the recesses provided for this purpose, so that a body is formed in the surface, from which only the cable leads out, so the microphone capsules are not visible.
  • the socket for the electronics housed in the upper part of the foam body also fulfills the function of a tie rod for the cable routed to the outside by absorbing tensile forces in the event of sudden tensile stress - someone treads on the cable - thereby tearing out the cable with the socket connected microphone capsules prevented from their seats. Because the can, which is considerably larger than the capsules, also absorbs greater forces with its bearing seat (adhesive bonding).
  • the acoustic properties of the sound pickup are significantly improved because of the substantial reduction in the volume of the foam body, which is due to the continuous, central and preferably circular bore with a diameter with a usual diameter for sound holes, the Damping of the air volume vibrating in the resonance body of the guitar is reduced and the sound hole remains open. Since the sound hole is not covered by the foam of the foam body, the latter has less influence on the natural sound of the guitar than a solid foam body. The sound of the guitar is therefore reproduced more naturally by the microphones. Without removing the foam body from the resonance body, playing with only slight tonal losses is possible even when the microphones are switched off, since the sound becomes "freer" with more pronounced ringing of the strings and there is more echo;
  • annular foam body can be manufactured from one part and the fully wired microphones, which are already installed in the valve feet, can be inserted through the central opening into the channel-like cavities, which lead radially outwards through the outer surface are.
  • the cross-sectionally semicircular ribs on the top and bottom of the annular foam fabric body adapt very well to sharp-edged, protruding parts, such as stiffening ribs, on the ceiling and bottom of the resonance body and are relatively easy to manufacture due to their stiffness.
  • the ribs also improve the design.
  • the elastic skin with a closed surface which is applied to the outer surface by a special process, creates an interface effect by reflecting the impinging sound.
  • the predetermined expansion of the skin surface essentially reflects the higher-frequency components with a correspondingly shorter wavelength.
  • the reflected portion is added in phase to the - unreflected - sound arriving from the sound source directly at the microphones because the microphone membranes are arranged in the plane of the skin. This results in an amplification of the higher-frequency sound components, which is a desired effect in guitars with conventional resonances in the low-frequency range.
  • valve feet are used, as are usually used to hold valves with bicycles hoses are screwed. Due to their very small dimensions, the microphones can be accommodated in the central bore of the valve base without additional processing, which means that the manufacturing technology
  • the central, circular opening of the foam body can be closed with a stopper made of fine-pored foam. In this way, with a small loss of natural sound, a greater amplification or volume is possible when playing through loudspeakers.
  • the ring-shaped foam body can be placed on a base-like foam body that is placed on the floor and protrudes with a protrusion into the central opening of the ring-shaped foam body. In this way, the annular foam body can also be used in special guitars without changing its dimensions.
  • an electronic circuit automatically switches to a battery provided in the housing in which the electronics of the pickup device are located Device is located, provided battery supply switched as soon as there is no phantom power.
  • the electronic circuit according to FIG. 7 light-emitting diodes can be used to visually indicate whether battery or phantom power is present.
  • this electronic circuit makes the impedance of the microphone outputs symmetrical at and at 200 ohms
  • the electronics of the pickup device according to the invention are preferably implemented in hybrid technology connected to two microphone transmitters.
  • the housing is small and robust and accommodates a 9 volt battery block.
  • the housing is made of mu-metal, so that the electronics inside protect against external electromagnetic interference fields, e.g. shielded from transformers for power supplies or from electric motors.
  • the geometric dimensions of the housing of the pickup device according to the invention can be kept relatively small by using a commercially available, multi-pole miniature flange socket for all outputs and a further miniature flange socket or a multi-core cable for all inputs.
  • Figure 1 is a cross section of the foam body of a first embodiment of the pickup device.
  • FIG. 3 shows a plan view of the foam body with installation aid
  • FIG. 4 is a sectional view showing an annular foam body of a second embodiment of the pickup device clamped in the resonance body of a stringed instrument;
  • FIG. 5 shows a plan view of the foam body of the second embodiment, the arrangement of the two microphones relative to one another being visible at an opening angle of 90;
  • FIG. 6 shows a side view of the foam body of the second embodiment, on the outer jacket of which an elastic skin is applied;
  • 7a is a partial longitudinal section showing a plug made of open-cell and fine-pored foam inserted into the upper central opening of the annular foam body to reduce the feedback sensitivity;
  • 7b shows a plan view of the foam body of FIG. 6a
  • 8a shows a side view of a base-like, open-pore foam body onto which the annular foam body can be placed in a coherent manner
  • FIG. 8b shows a plan view of the annular foam body assigned to the base-like foam body according to FIG. 5a;
  • 9a shows a plan view of the housing of the pickup device which contains the electronics
  • Fig. 9b is a side view of the housing of Fig. 6a and
  • Fig. 10 shows the electronic circuit of the electronics with optional power supply to the pickup device.
  • Fig. 1 shows a first embodiment of the pickup device with a foam body 1, which has a diameter of 130 mm and a height of 100 mm, wherein upper outer and lower ribs 2a and 4a of 20 mm and 35 are now included in this height . Furthermore, an upper inner rib 3a with a height of 15 mm is provided.
  • the foam body 1 consists of two parts 12a and 13a of approximately the same height, which can be glued together and, in the combined state, form a cavity 7a which accommodates electronics.
  • the foam body 1 has a substantially cylindrical lateral surface 9a.
  • the upper and lower ribs 2a, 3a and 4a are concentric to the vertical axis X of the foam body 1, are conical in cross section and are in linear contact with the cover or the bottom of the resonance body in the installed state of the pickup device.
  • the entire surface of the foam body 1 can be coated with velvet.
  • the foam body 1 On the lower side, the foam body 1 has a conical recess within the conical rib 4a.
  • the conical surfaces 14a of the upper ribs 2a and 3a are inclined by 13 ° to the vertical axis X of the foam body 1.
  • the outer and inner surfaces 15a and 16a of the conical lower rib 4a are inclined by 41 ° and 24 to the vertical axis.
  • the contact tips of the upper and lower ribs 2a, 3a and 4a have a radius of curvature of 4 mm and 5 mm, respectively.
  • the recess 11a on the lower end face of the foam body 1 has a depth of 35 mm and its diameter between the tips of the lower ribs 4a is 80 mm.
  • the wedge-shaped surfaces 17a of the pointers 10a (FIG. 3) on the upper end face are inclined at 45 ° to the vertical axis X.
  • the cavity 7a receiving the electronics in the upper half 13a of the foam body 1 has a diameter of 40 mm and a height of 15 mm.
  • a connecting cable 8a coming from outside the upper end face of the foam body is guided into the cavity 7a and connected to the electronics.
  • Fig. 2 shows the possibility of centering the "De Byl" in the sound hole.
  • the integrated wedge-shaped pointer 10a shown in FIGS. 2 and 3 shows the installation insert.
  • the sectional view according to FIG. 4 shows the annular, open-pore foam body 1 of a second embodiment of the pickup device, the outer jacket 2 of which is circular-cylindrical and which in the preferred second embodiment shown has a diameter of 130 mm.
  • the outer jacket 2 merges into a concentric upper rib 3 which is semicircular in cross section and which lies on the inner surface 4 of the lid 5 of the resonance body of the stringed instrument in a circular line.
  • the diameter of the circular lines in FIG. 4 is 100 mm.
  • the Radius of the upper semicircular ribs 3 is 15 mm.
  • the upper semicircular rib 3 merges on the inside into an inner jacket 6 which tapers downward at an angle of 10 to the vertical axis of the foam body 1 and has a diameter of 54 mm at its lower end.
  • the foam body 1 has a height of 100 mm, the circular cylindrical outer jacket 2 extending downwards up to 30 mm over the bottom 7 of the resonance body of the stringed instrument.
  • the circular-cylindrical outer jacket 2 merges at its lower end into an inwardly bent part 8 with a radius of curvature of 22 mm, which in turn merges into a straight part 9 which extends inwardly at an angle of 45 to the vertical axis A of the foam body 1.
  • a lower concentric rib 10 which is semicircular in cross section and has a radius of 5 mm, which lies in a circular shape on the bottom 7 of the resonance body of the stringed instrument.
  • the diameter of this circular line is 82 mm.
  • the lower semicircular rib 10 goes up into a straight line, at an angle of 25 to the vertical axis of the foam body 1 obliquely upward part 11, which in turn merges upwards into a curved part 12 with a radius of curvature of 40 mm, which on End of the downwardly tapered inner shell 6 of the foam body 1 passes into this at a height of 30 mm above the bottom 7 of the resonance body.
  • the foam body 1 is easily compressible, can be inserted comfortably through the sound hole 13 of the stringed instrument into the resonance body and, due to its elasticity, can be securely clamped against the floor 7 and the ceiling 5 of the resonance body. 4, the diameter of the sound hole 13 is somewhat smaller than 100 mm. 5 shows that two microphones 14, which are arranged in channel-like cavities 15 formed radially in the foam body 1, one
  • the two microphones 14, the membrane 17 of which are arranged in the outer circumferential surface 2 of the annular foam body 1 at an angle ⁇ 90 ° to one another, are seated in valve feet 18 which are provided symmetrically with respect to the diameter direction mentioned.
  • the two microphones 14 are directed into the large part of the resonance room.
  • an elastic, self-contained skin 19 is applied to the outer jacket 2 of the annular foam body 1, which is essentially cylindrical, and is connected to the foam.
  • the microphones 14 are above the valve foot 18 of the respective valve with the elastic skin 19 tense. How from
  • the skin 19 extends in the direction of the vertical axis A of the annular foam body 1 from 15 mm below the upper edge to 70 mm below the upper edge of the foam body 1.
  • the stopper 20 has an upper circular-cylindrical, plate-shaped part with a diameter of 100 mm and a height of 5 mm, which continues in one piece in a part 21 which is bent inward with a radius of curvature of 15 mm and which in turn tapers downwards , at the lower end a part 22 having a diameter of 61 mm runs out.
  • the plug 20 has a height of 45 mm in the direction of the vertical axis A.
  • the annular foam body 1 (FIG. 8b) can be placed on a base-like foam body 23 according to FIG. 8a that can be placed on the bottom 7 of the resonance body.
  • the base-like foam body 23 has a circular cylindrical lower part 24 with a diameter of preferably 90 mm and a height of 30 mm in the direction of the vertical axis A, which upwards into a curved part 25 with a radius of curvature of
  • the part 26 passes, which in turn continues into a part 26 tapering upwards at an angle of 25 to the vertical axis A.
  • the part 26 has a diameter of 62 mm at its upper end.
  • the parts 25 and 26 form a suitable protrusion which protrudes into the lower central opening 27 of the annular foam body 1 (FIG. 8b).
  • the height of the protrusion 25, 26 in the direction of the vertical axis A is 15 mm.
  • FIG. 9a and 9b show in plan view and in side view a housing 28 containing the electronics of the pickup device made of mu-metal, which is relatively small and robust and accommodates a battery block 29 (FIG. 10) of 9 volts.
  • the mu-metal of the housing 28 protects the electronics located inside, whose circuit is shown in Fig. 10, against external electromagnetic interference fields.
  • the housing 28 On the output side, the housing 28 has a commercially available, multipole miniature flange socket 30 for all outputs.
  • a multi-core cable is provided on the input side for all inputs.
  • the housing 28 has a diameter of 70 mm (FIG. 9a) and a height of 20 mm (FIG. 9b).
  • a light emitting diode D1 (FIGS. 9b and 10) can be used to indicate whether the power supply to the pickup device is carried out via phantom power.
  • FIG. 10 shows the circuit of the electronics of the pickup device with optional power supply via the battery block 29 located in the housing 28 or the phantom feed.
  • Fig. 10 shows two outputs K1 and K2 for mixer inputs with phantom power according to DIN 45596, symmetrical 200 O h m, to each of which a backelectret microphone capsule Q 1 or Q 2 can be connected via a low-frequency transformer T 1 or T 2, which effects an impedance transformation.
  • a series connection of metal film resistors R 1 and R 2 and R 3 and R 4 is connected in parallel to the primary part of the low-frequency part T 1 and T 2 .
  • An electrolytic capacitor C 1 or C 2 is connected in series with the secondary part of the low-frequency part T 1 or T 2 and the backelectret microphone capsule Q 1 or Q 2 .
  • a metal film resistor R 7 or R 8 is connected in the line branch in parallel with each backelectret microphone capsule Q 1 or Q 2 .
  • Outputs K 3 and K 4 for instrument amplifier inputs asymmetrical 20 kOhm are provided in the secondary branch of the low-frequency section T 1 and T 2 , which in turn also has a grounded direct connection for the mixer outputs K 1 and K 2 .
  • a line 31 leads through a metal film resistor R 5 switched Zener diode Z 1 , the light-emitting diode D 1 for the display in phantom mode, a downstream metal film resistor R 6 to the backelectret microphone capsule Q 2 .
  • the backelectret microphone capsule Q 1 is also connected to line 30.
  • the output of the metal film resistor R 6 is connected to earth via a Zener diode Z 2 .
  • the battery block 29 is connected to the line 31 via a silicon diode to protect the battery between the light-emitting diode D 1 for displaying the phantom power operation and the metal film resistor R 6 .

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Stringed Musical Instruments (AREA)

Abstract

Le dispositif décrit comporte un corps en mousse (1) à pores ouverts, qui s'insère dans l'ouï de l'instrument et qui peut être bloqué à l'intérieur de la caisse de résonance, des parties de sa surface inférieure touchant le fond de la caisse de résonance et des parties de sa surface supérieure touchant le haut de la caisse de résonance. Le corps en mousse (1) possède sur ces deux faces frontales des nervures (2a, 3a) de sections coniques, qui sont en contact linéaire avec le haut ou le fond de la caisse de résonance. Le corps en mousse (1) peut également être de forme annulaire avec un trou traversant. Dans le corps en mousse (1) sont ménagées des cavités en forme de canal, dans lesquelles sont logés des microphones (14) spécialement orientés. Les composants électroniques associés aux microphones (14) peuvent être agencés à l'intérieur ou à l'extérieur du corps en mousse (1).
EP88901540A 1987-02-08 1988-02-08 Dispositif de prise de son avec au moins deux micros ou instruments a cordes acoustiques, notamment pour guitares acoustiques Expired - Lifetime EP0301059B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88901540T ATE81558T1 (de) 1987-02-08 1988-02-08 Tonabnehmervorrichtung mit mindestens zwei mikrofonen fuer akustische saiteninstrumente, insbesonder fuer akustische gitarren.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE8702014U DE8702014U1 (de) 1987-02-08 1987-02-08 Tonabnehmervorrichtung mit mindestens zwei Mikrofonen für akustische Saiteninstrumente, insbesondere für akustische Gitarren
DE8702014U 1987-02-08
DE8711963U DE8711963U1 (de) 1987-09-01 1987-09-01 Tonabnehmervorrichtung mit mindestens zwei Mikrofonen für akustische Saiteninstrumente, insbesondere für akustische Gitarren
DE8711963U 1987-09-01

Publications (2)

Publication Number Publication Date
EP0301059A1 true EP0301059A1 (fr) 1989-02-01
EP0301059B1 EP0301059B1 (fr) 1992-10-14

Family

ID=25951521

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88901540A Expired - Lifetime EP0301059B1 (fr) 1987-02-08 1988-02-08 Dispositif de prise de son avec au moins deux micros ou instruments a cordes acoustiques, notamment pour guitares acoustiques

Country Status (5)

Country Link
US (1) US4949619A (fr)
EP (1) EP0301059B1 (fr)
AT (1) ATE81558T1 (fr)
DE (1) DE3875297D1 (fr)
WO (1) WO1988005952A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5401900A (en) * 1993-01-14 1995-03-28 Actodyne General, Inc. Mounting assembly for an acoustic pick-up
US5464948A (en) * 1994-04-22 1995-11-07 Actodyne General, Inc. Sensor assembly for a stringed musical instrument
US5641932A (en) * 1995-01-19 1997-06-24 Actodyne General, Inc. Sensor assembly for stringed musical instruments
US8822805B2 (en) * 2007-05-17 2014-09-02 Eliton, Llc Musical instrument
US20120312146A1 (en) * 2011-06-11 2012-12-13 Benjamin Randal Bekerman Interface Adapter for Installation of a Standard Magnetic Pickup into an Acoustic Guitar Sound Hole
CN103686484A (zh) * 2012-09-21 2014-03-26 刘骏涛 一种音箱
WO2014110718A1 (fr) * 2013-01-15 2014-07-24 Liu Juntao Haut-parleur en forme d'arc
CN103079129A (zh) * 2013-01-16 2013-05-01 刘骏涛 一种圆弧形音箱

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1529057A (en) * 1974-11-25 1978-10-18 Biro D Electronic musical instrument
US4151777A (en) * 1975-11-27 1979-05-01 Ikuo Nosaka Piano sound pickup method and device
US4182214A (en) * 1977-02-10 1980-01-08 Birotronics Ltd. Electronic musical instrument
DE3413510A1 (de) * 1984-04-10 1984-10-31 Werner Dipl.-Ing. 8000 München Widmeier Vorrichtung zur schallabnahme bei saitenmusikinstrumenten mit resonanzkorpus
DE8431266U1 (de) * 1984-10-22 1985-04-11 Byl, Franz de, 1000 Berlin Tonabnehmervorrichtung mit mindestens zwei mikrofonen fuer akustische saiteninstrumente, insbesondere fuer akustische gitarren

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8805952A1 *

Also Published As

Publication number Publication date
US4949619A (en) 1990-08-21
ATE81558T1 (de) 1992-10-15
WO1988005952A1 (fr) 1988-08-11
EP0301059B1 (fr) 1992-10-14
DE3875297D1 (de) 1992-11-19

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