Music – Instruments – Electrical musical tone generation
Patent
1990-03-29
1993-06-08
Shoop, Jr., William M.
Music
Instruments
Electrical musical tone generation
84661, 84DIG9, 84607, G10H 700, G10H 106
Patent
active
052181553
ABSTRACT:
A tone signal processing apparatus for time-divisionally reading out tone signal waveforms in units of different channels from a waveform memory for storing a plurality of kinds of tone signal waveforms each consisting of tone data at a plurality of sampling points. An arithmetic circuit for multiplying each of two input data with a predetermined coefficient, and adding the products, and a memory circuit for storing an output from the arithmetic circuit are arranged. The arithmetic circuit is alternately operated in two arithmetic modes, i.e., an interpolation arithmetic mode for multiplying each of two tone data at adjacent sampling points read out from the waveform memory with an interpolation coefficient, and adding the products to obtain an interpolated value obtained by interpolating between the adjacent sampling points, and a filter arithmetic mode for multiplying each of the interpolated value and a previous filter output obtained from the filter circuit with a filter coefficient to obtain a filter output. The filter coefficient is changed in units of channels to provide different filter characteristics in units of channels.
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Donels Jeffrey W.
Kabushiki Kaisha Kawai Gakki Seisakusho
Shoop Jr. William M.
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