Method and apparatus for spline parameter transitions in sound s

Details Method and apparatus for spline parameter transitions in sound s Method and apparatus for spline parameter transitions in sound s

1995-11-09

1997-09-09

Shoop, Jr., William M.

Music

Instruments

Electrical musical tone generation

84665, G10H 700, H03F 126

Patent

active

056659288

ABSTRACT:
In a sound (music) synthesis system, a transition between levels of a sound parameter (e.g. volume) is synthesized by fitting a cubic (third degree) spline function between two discontinuous parameter levels. This advantageously eliminates any sound artifacts (pops or clicks) which would otherwise be present due to abrupt changes in the parameter. The cubic spline is fitted (interpolated) to match both the parameter value and its derivative with respect to time at each of the adjacent parameter levels on either side of the transition. The transition thus is advantageously kept brief and in addition it is possible to deal with the situation when the parameter dynamically changes during the transition period, again without causing undesirable sound artifacts.

REFERENCES:
patent: 3878382 (1975-04-01), Bjor et al.
patent: 4901615 (1990-02-01), Matsushima et al.
patent: 5403971 (1995-04-01), Aoki
patent: 5428728 (1995-06-01), Lung et al.

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