Apparatus for reducing noise in digital to analog conversion

Details Apparatus for reducing noise in digital to analog conversion Apparatus for reducing noise in digital to analog conversion

1979-06-01

1981-01-20

Rubinson, Gene Z.

Music

Instruments

84 119, 84 101, 364723, 364724, G06F 1534, G10H 106

Patent

active

042455413

ABSTRACT:
In a musical instrument in which a plurality of data words corresponding to the amplitudes of a corresponding number of evenly spaced points defining a cycle of an audio waveform are transferred sequentially from a waveshape memory in repetitive cycles at a rate proportional to the pitch of the tone being generated, apparatus is provided for reducing undesired frequency components resulting from the conversion of the digital signals into analog musical signals. The noise reduction apparatus applies optimal amplitude weighting values to a subset of the stored data words and adds these weighted values together to provide a new single value which is used for the output signal.

REFERENCES:
patent: 4020332 (1977-04-01), Crochiere et al.
patent: 4111090 (1978-09-01), Deutsch

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