US PATENT SUBCLASS 84 / 647
.~.~ Digital combinational circuit

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
600  DF  .~ Electrical musical tone generation {5}
647.~.~ Digital combinational circuit {7}
648  DF  .~.~.~> With frequency multiplication or division
649  DF  .~.~.~> Note sequence {1}
653  DF  .~.~.~> Selecting circuits {5}
659  DF  .~.~.~> Tone synthesis or timbre control {2}
662  DF  .~.~.~> Expression or special effects {3}
666  DF  .~.~.~> Accompaniment {2}
670  DF  .~.~.~> Constructional details

DEFINITION

Classification: 84/647

Digital combinational circuit:

(under subclass 600) Subject matter wherein binary inputs are provided to digital combinational circuit to produce musical tone.

(1) Note. Digital combinational circuit performs some unique logic function such as decording, encording, multiplexing, comparison or an arithmetic operation with binary numbers.

(2) Note. This subclass does not provide for stored tone characteristic information to produce musical tone (See this class, subclass 602 for digital memory circuit).

SEE OR SEARCH CLASS

331, Oscillators, appropriate subclasses for oscillators used to provided a digital signal.