Electronic musical instrument with improved capability for simulating an actual musical instrument

Claim 2

A musical sound waveform generator for generating a musical sound waveform according to a mixed signal obtained by mixing a modulation signal with a carrier signal, comprising: a carrier signal generating means for generating a carrier signal, a modulation signal generating means for generating a modulation signal, a mixing controlling means for outputting a mixed signal X obtained by mixing said modulation signal with said carrier signal and for controlling the mixing ratio of said modulation signal to said carrier signal from 0 to a discretional mixing ratio, and a waveform outputting means, having a predetermined function relationship between input and output thereof, for outputting a musical sound waveform according to said mixed signal X received as an input signal from said mixing controlling means, wherein said predetermined function relationship in said waveform outputting means is neither a sine function nor a cosine function and said carrier signal generated by said carrier signal generating means is such that said musical sound waveform generated by said waveform outputting means is a sine wave or a cosine wave with a single frequency, where the mixing ratio of said modulation signal to said carrier signal is set to 0 by said mixing controlling means.

Claim 3

The musical sound waveform generator according to claim 1, wherein said carrier signal generating means receives a carrier wave phase angle ω ct , which increases at a constant angular speed and outputs a carrier signal W C , given by the following equations W.sub.C =(π/2) sin ω.sub.ct . . . (0≦ω.sub.ct ≦π/2) W.sub.C =π-(π/2) sin ω.sub.ct . . . (π/2≦ω.sub.ct ≦3π/2) W.sub.C =2π+(π/2) sin ω.sub.ct . . . (3π/2≦ω.sub.ct ≦2π), and said waveform outputting means outputs a musical sound waveform D when receiving said mixed signal x as an input, said waveform D being based on the following equations D=(2/π) x . . . (0≦x≦π/2) D-1+(2/π)(3π/2-x) . . . (π/2≦x≦3π/2) D=-1+(2/π)(x-3π/2) . . . (3π/2≦x≦2π).

Claim 4

The musical sound waveform generator according to claim 1, wherein said carrier signal generating means receives a carrier wave phase angle ω ct , which increases at a constant angular speed and outputs a carrier signal W C , given by the following equations W.sub.C =(π/4) sin ωhd ct . . . (0≦ω.sub.ct ≦π/2) W.sub.C =-(π/4) sin ω.sub.ct +π . . . (π/2≦ω.sub.ct ≦3π/2) W.sub.C =(π/4) sin ω.sub.ct +2π . . . (3π/2≦ω.sub.ct ≦2π), and said waveform outputting means outputs a musical sound waveform D when receiving said mixed signal x as an input, said waveform D being based on the following equations D=(4/π) x . . . (0≦x≦π/4) D=1 . . . (π/4≦x≦3π/4) D=-(4/π) x+4 . . . (3π/4≦x≦5π/4) D=-1 . . . (5π/4≦x≦7π/4) D=(4/π) x-8 . . . (7π/4≦x≦2π).

Claim 5

The musical sound waveform generator according to claim 1, wherein said carrier signal generating means receives a carrier wave phase angle ω ct , which increases at a constant angular speed and outputs a carrier signal W C , given by the following equations W.sub.C =ω.sub.ct /2 . . . (0≦ω.sub.ct ≦π/2) W.sub.C ω.sub.ct /2+π/2 . . . (π/2≦ω.sub.ct ≦3π/2) W.sub.C =ω.sub.ct /2+π . . . (3π/2≦ω.sub.ct ≦2π), and said waveform outputting means outputs a musical sound waveform D when receiving said mixed signal x as an input, said waveform D being based on the following equations (sin designates a sine wave arithmetic operation) D=sin 2x . . . (0≦x≦π/4) D=1 . . . (π/4≦x≦3π/4) D=sin (2x-π) . . . (3π/4≦x≦5π/4) D=-1 . . . (5π/4≦x≦7π/4) D=sin (2x-2π) . . . (7π/4≦x≦2π).

Claim 6

The musical sound waveform generator according to claim 1, wherein said carrier signal generating means receives a carrier wave phase angle ω ct , which increases at a constant angular speed and outputs a carrier signal W C , given by the following equations W.sub.C =ω.sub.ct . . . (0≦ω.sub.ct ≦π/2) W.sub.C ≦-(π/2) sin ω.sub.ct +π . . . (π/2≦ω.sub.ct ≦3π/2) W.sub.C≦ω.sub.ct . . . (3π/2≦ω.sub.ct ≦2π), and said waveform outputting means outputs a musical sound waveform D when receiving said mixed signal x as an input, said waveform D being based on the following equations D=sin x . . . (0≦x≦π/2) D=-(2/π) x+2 . . . (π/2≦x≦3π/2) D=sin x . . . (3π/2≦x≦2π).

Claim 7

The musical sound waveform generator according to claim 1, wherein said carrier signal generating means receives a carrier wave phase angle ω ct , which increases at a constant angular speed and outputs a carrier signal W C , given by the following equations W.sub.C =(π/2) sin ω.sub.ct . . . (0≦ω.sub.ct ≦π/2) W.sub.C =ω.sub.ct . . . (π/2≦ω.sub.ct ≦3π/2) W.sub.C =(π/2) sin ω.sub.ct +2π . . . (3π/2≦ω.sub.ct ≦2π), and said waveform outputting means outputs a musical sound waveform D when receiving said mixed signal x as an input, said waveform D being based on the following equations D=(2/π) x . . . (0≦x≦π/2) D=sin x . . . (π/2≦x≦3π/2) D=(2/π) x-4 . . . (3π/2≦x≦2π).

Claim 8

The musical sound waveform generator according to claim 1, further comprising a mixing ratio controlling means for varying with time the mixing ratio of said modulation signal to said carrier signal, used by said mixing control means, after the start of sound generation of said musical sound waveform.

Claim 9

The musical sound waveform generator according to claim 1, further comprising an amplitude envelope controlling means for changing with time the amplitude envelope characteristics of said musical sound waveform outputted from said waveform outputting means.

Claim 10

The musical sound waveform generator according to claim 1, wherein said carrier signal generating means, said modulation signal generating means, said mixing control means and said waveform outputting means perform a time divisional process on a plurality of sound generating channels and polyphonically output a plurality of musical sound waveforms assigned to corresponding sound generating channels.

Claim 11

A musical sound waveform generator according to claim 1, further comprising a random controlling means for performing a control so that at least one of said carrier signals generated by said carrier signal generating means, said modulation signal generated by said modulation signal generating means or said mixing ratio controlled by said mixing controlling means includes a component which varies randomly.

Claim 12

The musical sound waveform generator according to claim 1, further comprising a random controlling means for performing a control so that at least one of said carrier signal, said modulation signal and said mixing ratio includes a component which varies randomly within a predetermined time period after the start of generation of said musical sound waveform.

Claim 13

The musical sound waveform generator according to claim 11, wherein said predetermined time period is one of an attack period, an decay period, an sustain period or a release period in the amplitude envelope characteristics of said musical sound waveform.

Claim 14

The musical sound waveform generator according to claim 11, further comprising an amplitude envelope random controlling means for performing a control such that the amplitude envelope characteristics of said musical sound waveform outputted from said waveform outputting means includes a component which varies randomly within a predetermined time period after the start of generation of said musical sound waveform.

Claim 15

A musical sound waveform generating method for generating a musical sound waveform according to a mixed signal obtained by mixing a modulation signal with a carrier signal, comprising the steps of: generating a carrier signal, generating a modulation signal, outputting a mixed signal obtained by mixing said modulation signal with said carrier signal and controlling the mixing ratio of said modulation signal to said carrier signal from 0 to a discretional mixing ratio, and outputting a musical sound waveform according to said mixed signal provided as an input signal to a predetermined function relationship between an input and an output, wherein said predetermined function relationship is neither a sine function nor a cosine function and said carrier signal is such that said musical sound waveform is a sine wave or a cosine wave with a single frequency, where the mixing ratio of said modulation signal to said carrier signal is set to 0.

Claim 16

A musical sound waveform generating method for generating a musical sound waveform according to a mixed signal obtained by mixing a modulation signal with a carrier signal, comprising the steps of: generating a carrier signal, generating a modulation signal, outputting a mixed signal obtained by mixing said modulation signal with said carrier signal and controlling the mixing ratio of said modulation signal to said carrier signal from 0 to a discretional mixing ratio, and outputting a musical sound waveform according to said mixed signal provided as an input signal to a predetermined function relationship between an input and an output, wherein said predetermined function relationship is neither a sine function nor a cosine function and said carrier signal is such that said musical sound waveform is a sine wave or a cosine wave with a single frequency, where the mixing ratio of said modulation signal to said carrier signal is set to 0.

Claim 17

A musical sound waveform generator for generating a musical sound waveform according to a mixed signal obtained by mixing a modulation signal with a carrier signal and for controlling a characteristic of said musical sound waveform based on performance information generated in accordance with a performance operation, comprising: a carrier signal generating means for generating a carrier signal corresponding to said performance information, a modulation signal generating means for generating a modulation signal corresponding to said performance information, a mixing controlling means for outputting a mixed signal obtained by mixing said modulation signal with said carrier signal and for controlling the mixing ratio of said modulation signal to said carrier signal so that it varies in accordance with mixing characteristics corresponding to said performance information, and a waveform outputting means, having a predetermined function relationship between input and output thereof, for outputting a musical sound waveform according to said mixed signal received as an input signal from said mixing controlling means, wherein said predetermined function relationship in said waveform outputting means is neither a sine function nor a cosine function and said carrier signal is such that said musical sound waveform generated by said waveform outputting means is a sine wave or a cosine wave with a single frequency, where the mixing ratio of said modulation signal to said carrier signal is set to 0 by said mixing controlling means.

Claim 18

A musical sound waveform generator for generating a musical sound waveform according to a mixed signal obtained by mixing a modulation signal with a carrier signal and for controlling a characteristic of said musical sound waveform based on performance information generated in accordance with a performance operation, comprising: a carrier signal generating means for generating a carrier signal corresponding to said performance information, a modulation signal generating means for generating a modulation signal corresponding to said performance information, a mixing controlling means for outputting a mixed signal obtained by mixing said modulation signal with said carrier signal and for controlling the mixing ratio of said modulation signal to said carrier signal so that it varies in accordance with mixing characteristics corresponding to said performance information, and a waveform outputting means, having a predetermined function relationship between input and output thereof, for outputting a musical sound waveform according to said mixed signal received as an input signal from said mixing controlling means, wherein said predetermined function relationship in said waveform outputting means is neither a sine function nor a cosine function and said carrier signal is such that said musical sound waveform generated by said waveform outputting means is a sine wave or a cosine wave with a single frequency, where the mixing ratio of said modulation signal to said carrier signal is set to 0 by said mixing controlling means.

Claim 19

The musical sound waveform generator according to claim 15, wherein said performance operation is a key depression operation of a keyboard, and said mixing controlling means controls said mixing characteristics so that they correspond to at least one of a speed of said key depression operation or an area of the keyboard in which said key is depressed.

Claim 20

The musical sound waveform generator according to claim 15, further comprising an amplitude envelope controlling means for changing with time the amplitude envelope characteristics of said musical sound waveform outputted from said waveform outputting means to correspond to said performance information.

Claim 21

The musical sound waveform generator according to claim 15, wherein said carrier signal generating means, said modulation signal generating means, said mixing control means and said waveform outputting means perform a time divisional process on a plurality of sound generating channels and polyphonically output a plurality of musical sound waveforms assigned to corresponding sound generating channels.

Claim 22

A musical sound waveform generator for generating a musical sound waveform according to a mixed signal obtained by mixing a modulation signal with a carrier signal, comprising: a carrier signal generating means for generating a carrier signal, a modulation signal generating means for selectively generating plural kinds of modulation signals, a mixing controlling means for outputting a mixed signal obtained by mixing said selectively generated modulation signal with said carrier signal and for controlling the mixing ratio of said modulation signal to said carrier signal from 0 to a discretional mixing ratio, and a waveform outputting means, having a predetermined function relationship between an input and an output thereof, for outputting a musical sound waveform according to said mixed signal received as an input signal from said mixing controlling means, wherein said predetermined function relationship in said waveform outputting means is neither a sine function nor a cosine function and said carrier signal generated by said carrier signal generating means is such that said musical sound waveform generated by said waveform outputting means is a sine wave or a cosine wave with a single frequency, where the mixing ratio of said modulation signal to said carrier signal is set to 0.

Claim 23

A musical sound waveform generator for generating a musical sound waveform according to a mixed signal obtained by mixing a modulation signal with a carrier signal, comprising: a carrier signal generating means for generating a carrier signal, a modulation signal generating means for selectively generating plural kinds of modulation signals, a mixing controlling means for outputting a mixed signal obtained by mixing said selectively generated modulation signal with said carrier signal and for controlling the mixing ratio of said modulation signal to said carrier signal from 0 to a discretional mixing ratio, and a waveform outputting means, having a predetermined function relationship between an input and an output thereof, for outputting a musical sound waveform according to said mixed signal received as an input signal from said mixing controlling means, wherein said predetermined function relationship in said waveform outputting means is neither a sine function nor a cosine function and said carrier signal generated by said carrier signal generating means is such that said musical sound waveform generated by said waveform outputting means is a sine wave or a cosine wave with a single frequency, where the mixing ratio of said modulation signal to said carrier signal is set to 0.

Claim 24

The musical sound waveform generator according to claim 19, wherein said modulation signal generating means further comprises: a storing means for storing plural kinds of modulation functions beforehand, a selecting means for selecting one of said plural kinds of modulation functions stored in said storing means, and an outputting means for generating a modulation wave corrected phase angle signal by converting the inputted modulation wave phase angle signal by a modulation function selected by said selecting means and by further converting the modulation wave corrected phase angle signal based on a triangular wave function, thereby generating said modulation signal.

Claim 25

The musical sound waveform generator according to claim 19, further comprising an amplitude envelope controlling means for changing with time the amplitude envelope characteristic of said musical sound waveform outputted from waveform outputting means.

Claim 26

The musical sound waveform generator according to claim 19, wherein said carrier signal generating means, said modulation signal generating means, said mixing control means and said waveform outputting means perform a time divisional process on a plurality of sound generating channels and polyphonically output a plurality of musical sound waveforms assigned to corresponding sound generating channels.

Claim 27

A musical sound waveform generator for generating a musical sound waveform according to a mixed signal obtained by stereophonically mixing a modulation signal with a carrier signal, comprising: a carrier signal generating means for generating a carrier signal, a modulation signal generating means for generating a modulation signal, a mixing means for outputting a mixed signal obtained by mixing said modulation signal with said carrier signal, a mixing ratio controlling means for varying the mixing ratio of said modulation signal to said carrier signal from 0 to a discretional mixing ratio, a waveform outputting means, having a predetermined function relationship between input and output thereof, for outputting a musical sound waveform according to said mixed signal received as an input signal from said mixing means, and a time divisional controlling means for performing a time divisional control of said carrier signal generating means, said modulation signal generating means and said mixing ratio controlling means so that at least one of them generates values which are different between respective stereo channels, and inputting mixed signals of respective stereo channels from said mixing means at respective time divisional timings based on said time divisional control to said waveform outputting means, thereby outputting respective musical sound waveforms modulated independently for respective stereo channels, wherein said predetermined function relationship in said waveform outputting means is neither a sine function nor a cosine function and said carrier signal generated by said carrier signal generating means is such that said musical sound waveform generated by said waveform outputting means is a sine wave or a cosine wave with a single frequency, where the mixing ratio of said modulation signal to said carrier signal is set to 0 by said mixing ratio controlling means.

Claim 28

A musical sound waveform generator for generating a musical sound waveform according to a mixed signal obtained by stereophonically mixing a modulation signal with a carrier signal, comprising: a carrier signal generating means for generating a carrier signal, a modulation signal generating means for generating a modulation signal, a mixing means for outputting a mixed signal obtained by mixing said modulation signal with said carrier signal, a mixing ratio controlling means for varying the mixing ratio of said modulation signal to said carrier signal from 0 to a discretional mixing ratio, a waveform outputting means, having a predetermined function relationship between input and output thereof, for outputting a musical sound waveform according to said mixed signal received as an input signal from said mixing means, and a time divisional controlling means for performing a time divisional control of said carrier signal generating means, said modulation signal generating means and said mixing ratio controlling means so that at least one of them generates values which are different between respective stereo channels, and inputting mixed signals of respective stereo channels from said mixing means at respective time divisional timings based on said time divisional control to said waveform outputting means, thereby outputting respective musical sound waveforms modulated independently for respective stereo channels, wherein said predetermined function relationship in said waveform outputting means is neither a sine function nor a cosine function and said carrier signal generated by said carrier signal generating means is such that said musical sound waveform generated by said waveform outputting means is a sine wave or a cosine wave with a single frequency, where the mixing ratio of said modulation signal to said carrier signal is set to 0 by said mixing ratio controlling means.

Claim 29

The musical sound waveform generator according to claim 23, further comprising an amplitude envelope controlling means for varying with time the amplitude envelope characteristics of respective musical sound waveforms independently outputted from said waveform outputting means for respective stereo channels so that the respective amplitude envelope characteristics are different between respective stereo channels.

Claim 30

The musical signal waveform generator according to claim 23, wherein said carrier signal generating means, said modulation signal generating means, said mixing means, said mixing ratio controlling means, said waveform outputting means, and said time divisional controlling means perform a time divisional process by dividing said respective stereo channels further into a plurality of sound generating channels and stereophonically and polyphonically output a plurality of musical sound waveforms assigned to corresponding sound generating channels.

Claim 31

A musical sound waveform generator generating a musical sound waveform according to a mixed signal obtained by mixing a modulation signal with a carrier signal and for controlling a characteristics of said musical sound waveform based on performance information generated in accordance with a performance operation, comprising: a carrier signal generating means for generating a carrier signal, a modulation signal generating means for generating a modulation signal, a mixing controlling means for outputting a mixed signal obtained by mixing said modulation signal with said carrier signal and for controlling the mixing ratio of said modulation signal to said carrier signal from 0 to a discretional mixing ratio, a waveform outputting means, having a predetermined function relationship between an input and an output thereof, for outputting a musical sound waveform according to said mixed signal received as an input signal from said mixing controlling means, and a frequency ratio controlling means for performing a control such that the frequency ratio of said modulation signal to said carrier signal corresponds to said performance information, wherein said predetermined function relationship in said waveform outputting means is neither a sine function nor a cosine function and said carrier signal generated by said carrier signal generating means is such that said musical sound waveform generated by said waveform outputting means is a sine wave or a cosine wave with a single frequency, where the mixing ratio of said modulation signal to said carrier signal is made 0 by said mixing controlling means.

Claim 32

A musical sound waveform generator generating a musical sound waveform according to a mixed signal obtained by mixing a modulation signal with a carrier signal and for controlling a characteristics of said musical sound waveform based on performance information generated in accordance with a performance operation, comprising: a carrier signal generating means for generating a carrier signal, a modulation signal generating means for generating a modulation signal, a mixing controlling means for outputting a mixed signal obtained by mixing said modulation signal with said carrier signal and for controlling the mixing ratio of said modulation signal to said carrier signal from 0 to a discretional mixing ratio, a waveform outputting means, having a predetermined function relationship between an input and an output thereof, for outputting a musical sound waveform according to said mixed signal received as an input signal from said mixing controlling means, and a frequency ratio controlling means for performing a control such that the frequency ratio of said modulation signal to said carrier signal corresponds to said performance information, wherein said predetermined function relationship in said waveform outputting means is neither a sine function nor a cosine function and said carrier signal generated by said carrier signal generating means is such that said musical sound waveform generated by said waveform outputting means is a sine wave or a cosine wave with a single frequency, where the mixing ratio of said modulation signal to said carrier signal is made 0 by said mixing controlling means.

Claim 33

The musical sound waveform generator according to claim 26, wherein said frequency ratio controlling means controls said frequency ratio in accordance with the timbre of said musical sound waveform.

Claim 34

The musical sound waveform generator according to claim 26, wherein said performance operation is a depression of a key on a keyboard, and said frequency ratio controlling means controls said frequency ratio so that it corresponds to at least one of key depression speed and the area of the keyboard at which said depressed key is located.

Claim 35

A musical sound waveform generator for generating a musical sound waveform according to a mixed signal obtained by mixing a modulation signal with a carrier signal, comprising: a carrier signal generating means for generating a carrier signal, a modulation signal generating means for generating a modulation signal, a mixing controlling means for outputting a mixed signal obtained by mixing said modulation signal with said carrier signal and for controlling the mixing ratio of said modulation signal to said carrier signal, and a waveform outputting means, having a predetermined function relationship between an input and an output thereof, for outputting a musical sound waveform according to said mixed signal received as an input signal from said mixing controlling means, wherein said predetermined function relationship in said waveform outputting means is neither a sine function nor a cosine function, and is determined such that one of a sine wave and a cosine wave with a single frequency is outputted from the waveform outputting mean when the mixing ratio is a predetermined value, and wave shapes of said carrier signal and said modulation signal are specified ones.

Claim 36

A musical sound waveform generator for generating a musical sound waveform according to a mixed signal obtained by mixing a modulation signal with a carrier signal, comprising: a carrier signal generating means for generating a carrier signal, a modulation signal generating means for generating a modulation signal, a mixing controlling means for outputting a mixed signal obtained by mixing said modulation signal with said carrier signal and for controlling the mixing ratio of said modulation signal to said carrier signal, and a waveform outputting means, having a predetermined function relationship between an input and an output thereof, for outputting a musical sound waveform according to said mixed signal received as an input signal from said mixing controlling means, wherein said predetermined function relationship in said waveform outputting means is neither a sine function nor a cosine function, and is determined such that one of a sine wave and a cosine wave with a single frequency is outputted from the waveform outputting mean when the mixing ratio is a predetermined value, and wave shapes of said carrier signal and said modulation signal are specified ones.