Tone signal generation device for an electric musical instrument

Details Tone signal generation device for an electric musical instrument Tone signal generation device for an electric musical instrument

1987-06-11

1989-06-20

Grimley, Arthur T.

Music

Instruments

84 127, 84 101, 84DIG9, 333 14, G01H 102, G01H 100

Patent

active

048401005

ABSTRACT:
In storing digital tone waveshape data in a waveshape memory, sampled tone waveshape data is stored in the memory by previously elevating the level of frequency components in a predetermined high frequency region. This predetermined high frequency region corresponds to a frequency region to which quantization noise components belong. The tone waveshape data stored in the waveshape memory in this manner has the signal level of the component of the region including the quantization noise components reinforced as compared with the original tone waveshape. The tone waveshape data read out from the waveshape memory is applied to a filter of a characteristic which restrains the level of the component in the predetermined high frequency region. The level of the quantization noise components belonging to the predetermined high frequency region contained in the tone waveshape data thereby is restrained. On the other hand, the level of the signal components of the predetermined high frequency region is restored to the original level by this restraining of the level. Thus, the quantization noise can be eliminated without impairing the level of the signal component.

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