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Sound effect imparting device for an electronic musical instrument
| Details |
Inventors: Futamase, Tsuyoshi; Kato, Mitsumi;
Assignee: Nippon Gakki Seizo Kabushiki Kaisha (Hamamatsu, JP)
Primary Examiner: Witkowski; S. J.
Assistant Examiner:
Attorney, Agent or Firm: Spensley, Horn, Jubas & Lubitz
A sound effect imparting device for an electronic musical instrument is capable of imparting a plurality of desired sound effect such as vibrato and reverberation effects to a digital musical tone generated from the electronic musical instrument. The device comprises a digital arithmetic operation unit constructed with a combination of adders, multipliers, delay circuits, etc., a control unit, a parameter memory and a read-out unit. By control data and parameter data which are respectively read out from the control unit and the parameter memory by means of the read-out unit, switching of the operation mode of the digital arithmetic operation unit is controlled in a time-sharing manner, whereby a plurality of sound effects are imparted to a musical tone through digital arithmetic operations. |
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DETAILED DESCRIPTION Accordingly, this invention is directed to eliminate the above-mentioned drawbacks of prior art, and an object of this invention is to provide a sound effect imparting device to provide a sound effect imparting device for an electronic musical instrument, in which an effect imparting circuit for any desired sound effect is formed by means of a digital memory and a digital operation circuit based on the instruction of programmed control data, whereby a plurality of different sound effects may be easily imparted to musical tones in a time-sharing manner; such as imparting a reverberation effect after imparting a vibrato effects, imparting different kinds of sound effect in parallel and, to musical tones of plural sequences, imparting different kinds of sound effect to each musical tone sequence.
Another object of this invention is to provide a sound effect imparting circuit for an electronic musical instrument, in which a digital-coded musical tone signal can be directly inputted without employing a D/A converter and a filter, whereby device scale can be minimized.
A still further object of this invention is to provide a sound effect imparting circuit, in which parameters for controlling the characteristics of sound effects can be changed freely according to the instructions of programmed control data, whereby the sound effect characteristic can be changed during the performance of the musical instrument.
To achieve the above-mentioned objects of this invention, the addition of a plurality of desired effects is designed to be accomplished by a digital operation processing on the time-sharing basis, and the content of digital operation processing in this case is arranged so as to be freely determined by parameters and control data which correspond to individual effects.
According to this invention for imparting the modulation effect, such as vibrato or chorus effect, a digital filter corresponding to a desired modulation effect is designed with a digital memory and digital operational circuit according to the instruction of the control program, and digital-coded musical tone signals are fed to this digital filter
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