EP0216142A2 - Dispositif commutateur pour clavier - Google Patents

Dispositif commutateur pour clavier Download PDF

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Publication number
EP0216142A2
EP0216142A2 EP86111498A EP86111498A EP0216142A2 EP 0216142 A2 EP0216142 A2 EP 0216142A2 EP 86111498 A EP86111498 A EP 86111498A EP 86111498 A EP86111498 A EP 86111498A EP 0216142 A2 EP0216142 A2 EP 0216142A2
Authority
EP
European Patent Office
Prior art keywords
voltage
arrangement according
circuit
multiplex
key
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.)
Withdrawn
Application number
EP86111498A
Other languages
German (de)
English (en)
Other versions
EP0216142A3 (fr
Inventor
Siegfried Eppinger
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.)
Matth Hohner AG
Original Assignee
Matth Hohner AG
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 Matth Hohner AG filed Critical Matth Hohner AG
Publication of EP0216142A2 publication Critical patent/EP0216142A2/fr
Publication of EP0216142A3 publication Critical patent/EP0216142A3/fr
Withdrawn legal-status Critical Current

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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
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/32—Constructional details
    • G10H1/34—Switch arrangements, e.g. keyboards or mechanical switches specially adapted for electrophonic musical instruments
    • 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
    • G10H1/053—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 during execution only
    • G10H1/055—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 during execution only by switches with variable impedance elements
    • G10H1/0555—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 during execution only by switches with variable impedance elements using magnetic or electromagnetic means
    • 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
    • G10H1/18—Selecting circuits
    • G10H1/182—Key multiplexing

Definitions

  • the invention relates to a keyboard circuit arrangement for an electronic keyboard musical instrument, which has the features mentioned in the preamble of claim 1.
  • a mechanically deformable conductive component is assigned to each button, which changes its resistance in accordance with the touch strength; the output signal is also representative of movements that the player transfers to a key that has already been pressed.
  • the object of the invention is to provide a circuit arrangement of the type mentioned at the outset which, with little structural and circuit complexity, delivers a signal which very well represents the touch dynamics and is independent of the uncertainties resulting from contact transitions.
  • US-A-3,652,774 discloses an arrangement in which each key is assigned a coil in which an immersing permanent magnet induces a voltage when struck. This tension depends on the velocity of the stroke.
  • a pressure-sensitive resistor is assigned to each key in order to record the secondary effects when the key is pressed.
  • DE-C-30 07 156 discloses an arrangement in which an opto-electronic converter is assigned to each key. In this system, a distinction is only made between actuated and non-actuated buttons; however, this system is relatively insensitive to interference.
  • a sine or triangle generator 10 feeds the primary side 12 of a transformer 14 with an alternating voltage, the frequency of which is of the order of 200,500 kHz.
  • the secondary winding 16 of the transformer 14 is connected to coils 18 1 , 18 2 , ..., 18 n , each of which has a center tap.
  • Each center tap is connected to an associated input 20 1 , 20 2 , ..., 20 n of an analog multiplexer 22.
  • Each key (not shown) has a ferrite core, the expression “to have” to be understood such that when the key is pressed, the assigned ferrite core 24 1 , 24 2 ,..., 24 n from a position in which it is essentially only is immersed in the upper half-coil, is moved into a lower position in which it is essentially only effective in the lower half-coil.
  • the operative connection between the button and the assigned core can be very simple, for example by the core being attached directly to the button, or any lever linkage can be interposed, or the like. A clear assignment of key movement and core movement is essential.
  • the center tap 25 of the secondary winding 16 defines the ground potential. If the button is not pressed, the voltage of the center tap of the assigned coil is slightly below that of the earth, if the button is pressed halfway, the voltage is at ground potential and, when the button is pressed, above the ground potential. So you get a bipolar signal. However, in order to obtain a unipolar signal, the voltage at the base 26 of the secondary winding in the subsequent amplifier is partially added to the key signal. An evaluable unipolar signal is thus obtained at the output of the amplifier.
  • the bipolar signal is transmitted from the multiplexer 22 to an amplifier and rectifier circuit 28, in which a peak rectification takes place, and the output signal is transmitted to a sample and hold circuit 30.
  • the sample and hold circuit is reset to zero, for which two us are provided. 10 ⁇ s are required for the scanning process until the "hold" value is reached, and the transmission to an analog-to-digital converter 32 takes place for a further 10 us. Accordingly, the frequency of the generator 10 must be selected such that within 10 ⁇ s at least one full oscillation period is present, so that the frequency for the time data mentioned must be at least 100 kHz.
  • the output amplitude of the oscillator 10 is applied to the analog-digital converter 32 via a peak rectifier 34 as a reference in order to compensate for the effect of amplitude fluctuations.
  • the output of the converter 32 is connected via bus 36 to a microprocessor 38, which supplies the timing control via buses 40, 41, 42 and supplies the digital output signal to the actual sound generation circuit (not shown) via bus 44.
  • differential capacitors could also be used, a movable capacitor covering then being used as the coupling element.
  • the arrangement with coils described is preferred, however, because it has a low resistance and is therefore less susceptible to faults.
  • a particular advantage of the arrangement described is that an individual adjustment of the coils is not necessary and that they can be made relatively insensitive to contamination.
  • the range from 200 to 500 KHz was specified above. This is not essential. With single-wave rectification, one period of the oscillator would normally be required for the rectifier to detect the peak amplitude. With full wave rectification, however, only half a period would be necessary, and if - which is preferred - the oscillator is synchronized with the multiplex rate, even only a quarter period.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Electrophonic Musical Instruments (AREA)
EP86111498A 1985-09-26 1986-08-19 Dispositif commutateur pour clavier Withdrawn EP0216142A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3534250 1985-09-26
DE19853534250 DE3534250A1 (de) 1985-09-26 1985-09-26 Tastatur-schaltungsanordnung

Publications (2)

Publication Number Publication Date
EP0216142A2 true EP0216142A2 (fr) 1987-04-01
EP0216142A3 EP0216142A3 (fr) 1989-03-22

Family

ID=6281942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86111498A Withdrawn EP0216142A3 (fr) 1985-09-26 1986-08-19 Dispositif commutateur pour clavier

Country Status (3)

Country Link
US (1) US4765218A (fr)
EP (1) EP0216142A3 (fr)
DE (1) DE3534250A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3806597A1 (de) * 1988-03-02 1989-09-07 Hohner Ag Matth Tastatur-schaltungsanordnung
US5099738A (en) * 1989-01-03 1992-03-31 Hotz Instruments Technology, Inc. MIDI musical translator
US5365230A (en) * 1993-03-15 1994-11-15 Cordata, Inc. Inductively coupled keyboard
US5680126A (en) * 1992-06-29 1997-10-21 Elonex I.P. Holdings, Ltd. Modular portable computer
DE10031794C2 (de) * 2000-07-04 2003-10-02 Gallitzendoerfer Rainer Klaviatur für elektronische Musikinstrumente
JP2016057374A (ja) * 2014-09-08 2016-04-21 ヤマハ株式会社 操作子の操作検出装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS503874B1 (fr) * 1969-04-24 1975-02-12
US3614287A (en) * 1969-08-15 1971-10-19 Paul A Klann Multiplexing arrangement for electronic organs
US3594487A (en) * 1969-08-25 1971-07-20 Navcor Inc Contactless electronic keyboard array
US3652774A (en) * 1969-10-16 1972-03-28 Nippon Musical Instruments Mfg Keying system for electronic musical instruments
US3902397A (en) * 1973-01-12 1975-09-02 Chicago Musical Instr Co Electronic musical instrument with variable amplitude time encoded pulses
US4321852A (en) * 1979-12-19 1982-03-30 Young Jr Leroy D Stringed instrument synthesizer apparatus
DE3301354A1 (de) * 1983-01-18 1984-07-19 Matth. Hohner Ag, 7218 Trossingen Elektronisches musikinstrument
US4558623A (en) * 1984-02-07 1985-12-17 Kimball International, Inc. Velocity and aftertouch sensitive keyboard
US4628785A (en) * 1984-02-07 1986-12-16 Kimball International, Inc. Method and apparatus for calibrating a keyboard

Also Published As

Publication number Publication date
EP0216142A3 (fr) 1989-03-22
DE3534250A1 (de) 1987-04-02
US4765218A (en) 1988-08-23

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Inventor name: EPPINGER, SIEGFRIED