Function generators of time-dependent variable type
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United States of America Patent
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May 19, 1981
Grant Date -
N/A
app pub date -
Oct 24, 1979
filing date -
Oct 28, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A function generator of time-dependent variable type especially suitable for use as an envelope waveshape generator of an electronic musical instrument is constituted by means for setting multi-bit digitalized information which represents time information in terms of a logarithm, dividing means for dividing the bits of the time information into upper order bits and lower order bits at a bit of a predetermined order, means for converting a portion of the information represented by the lower order bits into linear information, a timing pulse generator which produces a timing pulse having a period corresponding to a value obtained by converting a portion of the information represented by the higher order bits into a natural number, and an accumulator for accumulating the output produced by the information converting means at a period of the timing pulse thereby producing an accumulated value as the time function waveshape which varies with time at a rate corresponding to the time information.
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