Electronic musical instrument having a vibrato effecting capability
First Claim
1. An electronic musical instrument capable of effecting vibratos with a tone being produced, comprising:
- a keyboard having a vibrato switch;
key detecting means for detecting a key on said keyboard which is pressed down;
key constant storing means storing predetermined key constants each being associated with respective one of tones which may be produced by said instrument;
address signal generating means for generating an address signal by performing, every predetermined period of time, an arithmetic operation with the key constant associated with the key which is pressed;
tone waveform storing means storing amplitudes of a tone waveform each being associated with respective one of a plurality of sampling points, in the form of digital values;
digital-to-analog converting means for sequentially converting the digital amplitudes read out of said tone waveform storing means in response to the address signals into an analog tone signal;
counting means for counting clock pulses which begin to appear when a power supply of said instrument is turned on;
vibrato constant storing means storing vibrato constant each being associated with respective one of the keys on said keyboard; and
adding and subtracting means for, when said vibrato switch is pressed, periodically performing addition and subtraction with the key constant and vibrato constant in response to an addition/subtraction switchover signal and an addition/subtraction execution control signal which are constituted by an output of said counting means.
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Accused Products
Abstract
An electronic musical instrument capable of effecting vibratos with any of tones which may be produced by pressing down the keys of a keyboard. A key constant memory stores key constants each being assigned to a different tone, while a vibrato constant memory stores vibrato constants each being assigned to a different tone. The keyboard is provided with an exclusive switch for effecting vibratos. When this exclusive switch is pressed, a counter which counts clock pulses feeds its output to an adder/subtractor in the form of an addition/subtraction switchover signal and an addition/subtraction execution control signal. In response, the adder/subtractor periodically and alternately performs addition and subtraction with the key constant and vibrato constant associated with a key being pressed down.
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Citations
1 Claim
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1. An electronic musical instrument capable of effecting vibratos with a tone being produced, comprising:
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a keyboard having a vibrato switch; key detecting means for detecting a key on said keyboard which is pressed down; key constant storing means storing predetermined key constants each being associated with respective one of tones which may be produced by said instrument; address signal generating means for generating an address signal by performing, every predetermined period of time, an arithmetic operation with the key constant associated with the key which is pressed; tone waveform storing means storing amplitudes of a tone waveform each being associated with respective one of a plurality of sampling points, in the form of digital values; digital-to-analog converting means for sequentially converting the digital amplitudes read out of said tone waveform storing means in response to the address signals into an analog tone signal; counting means for counting clock pulses which begin to appear when a power supply of said instrument is turned on; vibrato constant storing means storing vibrato constant each being associated with respective one of the keys on said keyboard; and adding and subtracting means for, when said vibrato switch is pressed, periodically performing addition and subtraction with the key constant and vibrato constant in response to an addition/subtraction switchover signal and an addition/subtraction execution control signal which are constituted by an output of said counting means.
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Specification