Method and apparatus for synthesizing music tones with high harmonic content

Claim 1

In a method for synthesizing a musical tone signal on the basis of a predetermined modulation operation employing a modulating signal and a carrier signal, wherein a predetermined waveshape signal is generated in accordance with a stored waveshape table and is used for defining at least one of a modulating wave function and a carrier wave function, wherein the predetermined waveshape signal is a periodic signal having a regularly progressing form within each period, the steps comprising: specifying a phase section of each period of the waveshape signal, said phase section including plural table values and being less than one period of the waveshape signal; modifying the waveshape signal in the specified phase section to provide a modified waveshape signal which has a different form in the specified phase section than that of the remainder of the waveshape signal; and executing said modulation operation by utilizing the modified waveshape signal as said modulating signal or said carrier signal.

Claim 15

An apparatus for synthesizing a musical tone comprising: means for supplying modulation data representing a progressive phase angle value of a modulating signal; means for supplying carrier data representing a progressive phase angle value of a carrier signal; and modulation operation means for executing a predetermined modulation operation employing said modulation data and said carrier data to synthesize a musical tone; said modulation operation means comprising a modulating wave function generation means generating said modulating signal in response to said modulation data and a carrier function generation means generating said carrier signal in response to said carrier data, wherein said modulation operation means modulates the carrier signal in response to the modulating signal, at least one of said modulating wave function generation means and said carrier function generation means comprising a waveshape table storing predetermined waveshape data, said waveshape data being read out as a waveshape signal from said waveshape table in response to said data representing a progressive phase angle value, wherein said waveshape signal is a periodic signal having a regularly progressing form within each period, means for specifying a phase section of each period of the waveshape signal, said phase section including plural table values and being less than one period of the waveshape signal, and modifying means for modifying, in the specified phase section, the waveshape signal to provide a modified waveshape signal having a form in the specified phase section different from the form of the remainder thereof.

Claim 16

An apparatus for synthesizing a musical tone comprising: means for supplying modulation data representing a progressive phase angle value of a modulating signal; means for supplying carrier data representing a progressive phase angle value of a carrier signal; and modulation operation means for executing a predetermined modulation operation employing said modulation data and said carrier data to synthesize a musical tone; said modulation operation means comprising a modulating wave function generation means generating said modulating signal in response to said modulation data and a carrier function generation means generating said carrier signal in response to said carrier data, wherein said modulation operation means modulates the carrier signal in response to the modulating signal, at least one of said modulating wave function generation means and said carrier function generation means comprising a waveshape table storing predetermined waveshape data, said waveshape data being read out as a waveshape signal from said waveshape table in response to said data representing a progressive phase angle value, wherein said waveshape signal is a periodic signal having a regularly progressing form within each period, means for specifying a phase section of each period of the waveshape signal, said phase section including plural table values and being less than one period of the waveshape signal, and modifying means for modifying, in the specified phase section, the waveshape signal to provide a modified waveshape signal having a form in the specified phase section different from the form of the remainder thereof.

Claim 20

An apparatus for synthesizing a musical tone comprising: means for supplying modulation data representing a progressive phase angle value of a modulating signal; means for supplying carrier data representing a progressive phase angle value of a carrier signal; and modulation operation means for executing a predetermined modulation operation employing said modulation data and said carrier data to synthesize a musical tone; said modulation operation means comprising a modulating wave function generation means generating said modulating signal in response to said modulation data and a carrier function generation means generating said carrier signal in response to said carrier data, wherein said modulation operation means modulates the carrier signal in response to the modulating signal, at least one of said modulating wave function generation means and said carrier function generation means comprising a waveshape table storing predetermined waveshape data, said waveshape data being read out as a waveshape signal from said waveshape table in response to the data representing a progressive phase angle value, wherein said waveshape signal is a periodic signal having a regularly progressing form within each period, means for specifying a phase section of each period of the waveshape signal, and modifying means for modifying, in a specified phase section, the waveshape signal to have a form different from the regularly progressing form, wherein said modifying means comprises detection means for detecting said specified phase section in response to a value of said data representing said progressive phase angle value to be applied to said waveshape table and means for modifying, upon detection of said specified phase section, the value of said data representing said progressive phase angle value to be applied to said waveshape table.

Claim 21

An apparatus for synthesizing a musical tone comprising: means for supplying modulation data representing a progressive phase angle value of a modulating signal; means for supplying carrier data representing a progressive phase angle value of a carrier signal; and modulation operation means for executing a predetermined modulation operation employing said modulation data and said carrier data to synthesize a musical tone; said modulation operation means comprising a modulating wave function generation means generating said modulating signal in response to said modulation data and a carrier function generation means generating said carrier signal in response to said carrier data, wherein said modulation operation means modulates the carrier signal in response to the modulating signal, at least one of said modulating wave function generation means and said carrier function generation means comprising a waveshape table storing predetermined waveshape data, said waveshape data being read out as a waveshape signal from said waveshape table in response to the data representing a progressive phase angle value, wherein said waveshape signal is a periodic signal having a regularly progressing form within each period, means for specifying a phase section of each period of the waveshape signal, and modifying means for modifying, in a specified phase section, the waveshape signal to have a form different from the regularly progressing form, wherein said modifying means comprises detection means for detecting said specified phase section in response to a value of said data representing said progressive phase angle value to be applied to said waveshape table and means for modifying, upon detection of said specified phase section, the value of said data representing said progressive phase angle value to be applied to said waveshape table.

Claim 22

An apparatus for synthesizing a musical tone comprising: means for supplying modulation data representing a progressive phase angle value of a modulating signal; means for supplying carrier data representing a progressive phase angle value of a carrier signal; and modulating operation means for executing a predetermined modulation operation employing said modulation data and said carrier data to synthesize a musical tone; said modulation operation means comprising a modulating wave function generation means generating said modulating signal in response to said modulation data and a carrier function generation means generating said carrier signal in response to said carrier data, wherein said modulation operation means modulates the carrier signal in response to the modulating signal, at least one of said modulating wave function generation means and said carrier function generation means comprising a waveshape table storing predetermined waveshape data, said waveshape data being read out from said waveshape table in response to said data representing a progressive phase angle value, and modifying means for modifying, in a specified phase section, a value of waveshape data read out from said waveshape table, wherein said modifying means comprises: a first circuit for modifying the value of said data representing a progressive phase angle value applied to said waveshape table in response to a first control signal; a second circuit for modifying the value of said waveshape data provided by said waveshape table in response to a second control signal; a third circuit provided for setting the polarity of said waveshape data in response to a third control signal; and control means for detecting one or more predetermined phase sections in accordance with the value of said data representing a progressive phase angle value before being applied to said first circuit and selectively generating, upon this detection, said first to third control signals in a predetermined combination.

Claim 23

An apparatus for synthesizing a musical tone comprising: means for supplying modulation data representing a progressive phase angle value of a modulating signal; means for supplying carrier data representing a progressive phase angle value of a carrier signal; and modulating operation means for executing a predetermined modulation operation employing said modulation data and said carrier data to synthesize a musical tone; said modulation operation means comprising a modulating wave function generation means generating said modulating signal in response to said modulation data and a carrier function generation means generating said carrier signal in response to said carrier data, wherein said modulation operation means modulates the carrier signal in response to the modulating signal, at least one of said modulating wave function generation means and said carrier function generation means comprising a waveshape table storing predetermined waveshape data, said waveshape data being read out from said waveshape table in response to said data representing a progressive phase angle value, and modifying means for modifying, in a specified phase section, a value of waveshape data read out from said waveshape table, wherein said modifying means comprises: a first circuit for modifying the value of said data representing a progressive phase angle value applied to said waveshape table in response to a first control signal; a second circuit for modifying the value of said waveshape data provided by said waveshape table in response to a second control signal; a third circuit provided for setting the polarity of said waveshape data in response to a third control signal; and control means for detecting one or more predetermined phase sections in accordance with the value of said data representing a progressive phase angle value before being applied to said first circuit and selectively generating, upon this detection, said first to third control signals in a predetermined combination.