Wind instrument sound producing system for electronic musical instruments

Claim 2

A wind instrument sound producing system for an electronic musical instrument comprising means for generating a first tone signal having a clarinet-type tone color, means for generating a second tone signal having a trumpet-type tone color, means for generating a third noise tone signal, a first envelope circuit for controlling said first tone signal to cause said first tone signal to have an envelope having a slow rise time and which is successively sustained, a second envelope circuit for controlling said second tone signal to cause the second tone signal to have an envelope having a moderate rise time and which successively rapidly decays to represent a faintly sustained sound, a third envelope circuit for controlling said third tone signal to cause the third tone signal to have an envelope having a rapid rise time and which rapidly decays to represent a sustained sound weaker than said faintly sustained sound, and an extracting means for converting a sound signal obtained by mixing the outputs from said first, second and third envelope circuits into a musical sound corresponding to the sound of the wind instrument.

Claim 3

The system according to claim 1 wherein said first tone signal generating means comprises a tone generating a tone signal, a first keying switch receiving said tone signal and responsive to a keyboard, and a first tone coloring circuit for causing an output signal from said first keying switch to have a clarinet-type sound, said second tone signal generating means comprises a second tone coloring circuit for causing the tone signal generated by said tone generator and supplied thereto through said first keying switch to have a trumpet-type sound, and said third tone signal generating means comprises a noise tone generator for generating a noise tone signal, a second keying switch for receiving said noise tone signal and operated in response to the keyboard, and a band-pass filter to which an output tone signal is fed from said second keying switch.

Claim 4

The system according to claim 2 wherein said first envelope circuit comprises a first time constant setting circuit energized by a DC power supply through a switch, a first lamp lit by an output voltage derived from said first time constant setting circuit and which has a waveform of the same pattern as an envelope required in said first envelope circuit, and a first photoconductive element to which said first tone signal derived from said first tone coloring circuit is fed and which is radiated by said first lamp to vary a conductivity in response to the intensity of radiation of said first lamp, said second envelope circuit comprises a second time constant setting circuit energizeD by a DC power supply through said switch, a second lamp lit by a voltage derived from said second time constant setting circuit and which has a waveform of the same pattern as an envelope required in said second envelope circuit, and a second photoconductive element to which said first tone signal derived from said second tone coloring circuit is fed and which is radiated by said second lamp to vary a conductivity in response to the intensity of radiation of said second lamp, and said third envelope circuit comprises a third time constant setting circuit energized by a DC power supply through said switch, a third lamp lit by a voltage derived from said third time constant setting circuit and which has a waveform of the same pattern as an envelope required in said third envelope circuit, and a third photoconductive element to which said third tone signal derived from said third tone coloring circuit is fed and which is radiated by said third lamp to vary a conductivity in response to the intensity of radiation of said third lamp.

Claim 5

The system according to claim 2 wherein said first envelope circuit comprises a cascade connection of a first integrator connected to a switch to represent make contacts and a first envelope regulating circuit including a first field effect transistor having a drain to which said first tone signal is applied from said first tone coloring circuit and a gate to which an output from said first integrator is supplied and controlling the envelope of said first tone signal by the gate signal obtained, said second envelope circuit comprises a cascade connection of a pulse shaper connected to said switch, a first monostable multivibrator, a second integrator and a second envelope regulating circuit including a second field effect transistor having a drain to which said second tone signal is supplied from said second coloring circuit and a gate to which an output from said second integrator is supplied and controlling the envelope of said second tone signal by the gate signal obtained; and said third envelope circuit comprises a cascade connection of said pulse shaper connected to said switch, a second monostable multivibrator, a third integrator and a third envelope regulating circuit including a third field effect transistor having a drain to which said third tone signal is supplied from said band-pass filter and a gate to which an output from said third integrator is supplied and controlling the envelope of said third tone signal by the gate signal obtained.

Claim 6

A circuit device comprising a first time constant circuit from which a first signal is derived, said first signal having an envelope which has a slow rise time, reaches a peak point in 500 ms. after the beginning of the signal and later stands at a constant level, a second time constant circuit from which a second signal is derived, said second signal having an envelope which has a moderate rise time, reaches a peak point in 40 ms. after the beginning of the signal, has a moderate decaying time and later stands at a constant level to represent a faintly sustained sound; and a third time constant circuit from which a third signal is derived, said third signal having an envelope which has a rapid rise time reaches a peak point in 20 ms. after the beginning of the signal, has a rapid decaying time and later stands at a constant level to represent a sustained sound weaker than said faintly sustained sound.

Claim 7

A circuit device comprising a first time constant circuit from which a first signal is derived, said first signal having an envelope which has a slow rise time, reaches a peak point in 500 ms. after the beginning of the signal and later stands at a constant level, a second time constant circuit from which a second signal is derived, said second signal having an envelope which has a moderate rise time, reaches a peak point in 40 ms. after the beginning of the signal, has a moderate decaying time and later stands at a constant level to represent a faintly sustained sound; and a third time constant circuit from which a third signal is derived, said third signal having an envelope which has a rapid rise time reaches a peak point in 20 ms. after the beginning of the signal, has a rapid decaying time and later stands at a constant level to represent a sustained sound weaker than said faintly sustained sound.