Abstract An electronic musical instrument capable of controlling a tone color of a musical tone at the time of rise of the tone as well as the intensity of the tone in proportion to a key-depressing force so as to produce, in particular, a musical sound simulating to that produced by a wind instrument, whereby the expressionability of music can be improved. The said electronic musical instrument comprising a touch responsive DC voltage generator circuit for deriving a DC output at a level in response to a key-depressing force, a tone generator for generating a tone, signal, means for switching said tone signal by the output signal derived from said DC voltage generator circuit, a tonecoloring circuit including a filter for giving a musical tone color to the tone signal from said switching means, a pulsederiving circuit for producing a pulse from the DC output of said DC voltage generator circuit at the time of rise of the DC output, the intensity of the pulse being proportional to the intensity of the DC output, and a wave from transducer for converting the pulse from the pulse-deriving circuit into a control signal having a predetermined rising and decaying wave form, said filter circuit having variable impedance means whose impedance is varied by and in response to the control signal from the wave form transducer and as a result the frequency characteristic of the filter circuit being carried in response to the control signal.
An electronic musical instrument comprising a touch responsive DC voltage generator circuit for deriving a DC output at a level in response to a key-depressing force, a tone generator for generating a tone signal, means for switching said tone signal by the output signal derived from said DC voltage generator circuit, a tone-coloring circuit including a filter for giving a musical tone color to the tone signal from said switching means, a pulse-deriving circuit for producing a pulse from the DC output of said DC voltage generator circuit at the time of rise of the DC output, the intensity of the pulse being proportional to the intensity of the DC output, and a waveform transducer for converting the pulse from the pulse-deriving circuit into a control signal having a predetermined rising and decaying waveform, said filter circuit having variable impedance means whose impedance is varied by and in response to the control signal from the waveform transducer and as a result the frequency characteristic of the filter circuit being varied in response to the control signal.
Claim 2
Dependent Claim
176 words
An electronic musical instrument comprising a touch responsive DC voltage generator circuit for deriving a DC output at a level in response to a key-depressing force, a tone generator for generating a tone signal, means for switching said tone signal by the output signal derived from said DC voltage generator circuit, a tone-coloring circuit including a filter for giving a musical tone color to the tone signal from said switching means, a pulse-deriving circuit for producing a pulse from the DC output of said DC voltage generator circuit at the time of rise of the DC output, the intensity of the pulse being proportional to the intensity of the DC output, and a waveform transducer for converting the pulse from the pulse-deriving circuit into a control signal having a predetermined rising and decaying waveform, said filter circuit having variable impedance means whose impedance is varied by and in response to the control signal from the waveform transducer and as a result the frequency characteristic of the filter circuit being varied in response to the control signal.
Claim 3
Dependent Claim
45 words
An electronic musical instrument as claimed in claim 1 in which said variable impedance means is a field effect transistor with its gate connected to the output of said transducer so as to vary the impedance of itself by the pulse applied from said transducer
Claim 4
Dependent Claim
50 words
An electronic musical instrument as claimed in claim 1 further comprising a DC bias circuit of which the input is connected with the input of said pulse-deriving circuit and the output is connected with the output of said waveform transducer for controlling said tone-coloring circuit while the key is depressed.
Claim 5
Dependent Claim
56 words
An electronic musical instrument as claimed in claim 3 in which said variable impedance means is a field effect transistor with its gate connected to the outputs of said transducer and said bias circuit so as to vary the impedance of itself by the pulse applied from the outputs of said transducer and said bias circuit.
Claim 6
Dependent Claim
36 words
An electronic musical instrument as claimed in claim 4 in which said filter circuit comprises means to vary the capacitive component of said filter circuit by the variation of the impedance of said field effect transistor.