Musical tone waveform producing apparatus for electronic musical instrument

A musical tone waveform producing apparatus comprising:

• a memory storing first and second predetermined signals, the first signal representing a waveform, the second signal representing a degree of attenuation;
• means for simultaneously reading the first and second signals from the memory;
• means, responsive to the read second signal, for generating a third signal representing an envelope which varies in accordance with the degree of attenuation represented by the read second signal;
• and
• means for combining the read first signal and the generated third signal into a fourth signal representing a tone which depends on the waveform and the envelope represented by the read first signal and the generated third signal, respectively.

A musical tone waveform producing apparatus comprising:

• a memory storing a first signal having a first component and a second component, the first component representing a waveform, the second component representing a degree of attenuation;
• means for reading the first signal from the memory;
• means for separating the read first signal into the first component and the second component;
• means, responsive to the separated second component of the first signal, for generating a second signal representing an envelope which varies in accordance with the degree of attenuation represented by the separated second component of the first signal;
• and
• means for combining the separated first component of the first signal and the generated second signal into a third signal representing a tone which depends on the waveform and the envelope represented by the read first component of the first signal and the generated second signal, respectively.

A musical tone waveform producing apparatus comprising:

• a first memory storing first and second predetermined signals, the first signal representing a waveform, the second signal representing a degree of attenuation;
• means for simultaneously reading the first and second signals from the first memory;
• a second memory storing third signal representing a first envelope;
• means for reading the third signal from the second memory in synchronism with the reading of the first and second signals from the first memory;
• means for generating a fourth signal representing a second envelope smaller in level than the first envelope;
• means for selecting one of the read third signal and the generated fourth signal in accordance with the read second signal;
• and
• means for combining the read first signal and said selected one of the read third signal and the generated fourth signal into a fifth signal representing a tone which depends on the waveform represented by the read first signal and which depends on the envelope represented by said selected one of the read third signal and the generated fourth signal.

A musical tone waveform producing apparatus comprising:

• a first memory storing a first signal having a first component and a second component, the first component representing a waveform, the second component representing a degree of attenuation;
• means for reading the first signal from the first memory;
• means for separating the read first signal into the first component and the second component;
• a second memory storing a second signal representing a first envelope;
• means for reading the second signal from the second memory in synchronism with the reading of the first signal from the first memory;
• means for generating a third signal representing a second envelope which is smaller in level than the first envelope;
• means for selecting one of the read second signal and the generated third signal in accordance with the separated second component of the first signal;
• and
• means for combining the separated first component of the first signal and said selected one of the read second signal and the generated third signal into a fourth signal representing a tone which depends on the waveform represented by the separated first component of the first signal and which depends on the envelope represented by said selected one of the read second signal and the generated third signal,
• whereby a noise component caused in one tone-color waveform by a following tone-color waveform data is eliminated.