(under subclass 99) Subject matter including significant detail of changing some parameter of the information signal.
(1) Note. The parameter change must modify the relationship among plural signal parameters, other than a multiplication of the magnitude. Therefore simple amplification is not classified in this or its indented subclasses, but a change in degree of amplification (e.g., automatic volume control, compression) would be so classified.
(2) Note. Circuitry for changing signal parameters, in general, is classified in the class containing the particular circuitry structure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
88, for similar subject matter in a stereophonic retrieval system.
124, for similar subject matter in a radiation beam retrieval system.
134, for similar subject matter in an electrically actuated mechanical recording system.
