Waveshape memory type keyboard electronic musical instrument
AssigneeNippon Gakki Seizo Kabushiki Kaisha
InventorsShigeo Ando, Takayasu Kondou
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Abstract
In a keyboard electronic musical instrument of waveshape memory type wherein different waveshapes read out from memories are mixed together at a variable mixing ratio according to variable parameters and then converted to a musical tone, the variable parameters are calculated on the basis of information associated with both lapse of time and the pitch of a musical tone to be produced. Thus, with this musical instrument, it is possible to produce a musical tone varying in the content of higher harmonics with respect to the pitch of the tone assigned to a depressed key and in tone color according to lapse of time.
Claims14
An electronic musical instrument of keyboard type having a plurality of keys, comprising:
- a plurality of waveshape storage means storing different waveshapes and accessible in response to an operation of tone selection means associated with said keys to deliver said different waveshapes, said waveshapes having the same fundamental frequency but different harmonic content;
- mixing means for obtaining a composite waveshape of said different waveshapes mixed at a variable mixing ratio according to at least one variable parameter;
- conversion means for converting said composite waveshape to a corresponding musical tone;
- first information generating means for generating first information representing a time-dependent parameter related with time following depression of a key;
- second information generating means for generating second information representing a key-dependent parameter related with the pitch of a tone assigned to the depressed key;
- and
- parameter generating means for generating said variable parameter on the basis of said first information and said second information, thereby producing in cooperation with said mixing means said composite waveshape, said composite waveshape being indicative of a musical tone having a harmonic content that varies in accordance with the pitch assigned to the depressed key and with lapse of time.
In an electronic musical instrument including a keyboard circuit for selecting a note, a waveshape information generating means for obtaining composite waveshape information, and a sound system for producing sound from said composite waveshape information, the improvement comprising:
- first information generating means responsive to an output of said keyboard circuit for providing a time-dependent signal indicative of a variation in tone color with lapse of time of a selected note;
- second information generating means responsive to another output of said keyboard circuit for providing a key-dependent signal indicative of a variation in tone color with the pitch of said selected note;
- and
- parameter generating means responsive to said time-dependent signal and said key-dependent signal for obtaining a plurality of mixing parameters representative of pitch-time varying information;
- wherein said waveshape information generating means is responsive to said output of said keyboard circuit and said plurality of mixing parameters.
In an electronic musical instrument of the type including a plurality of waveshape memories having stored therein sample values of respective waveshapes of different harmonic content, each of said respective waveshapes defining a single cycle, means for repeatedly reading out said sample values from each of said waveshape memories, means for mixing said sample values in accordance with a plurality of mixing parameters to provide a proportional mix of sample values, means for imparting a predetermined attack/delay function to said proportional mix of sample values to obtain a composite signal, and means responsive to said composite signal for generating an audio tone, the improvement comprising:
- first information generating means for providing a time-dependent signal varying continuously as determined by lapse of time;
- second information generating means for providing a pitch-dependent signal, said pitch-dependent signal having a predetermined value for each pitch;
- an adder responsive to said time-dependent and pitch-dependent signals for obtaining a time-pitch dependent signal;
- and
- means responsive to said time-pitch dependent signal for obtaining said plurality of mixing parameters.
Dependencies are inferred from the claim text.