(under subclass 197) Subject matter wherein each control signal is a vibratory wave having a distinctive frequency characteristic.
SEE OR SEARCH CLASS
381, Electrical Audio Signal Processing Systems and Devices,
110, for voice controlled audio signal systems.
CROSS-REFERENCE ART COLLECTIONS
The following subclasses are collections of published disclosures pertaining to various specified aspects of the electroacoustic communication art which do not form appropriate bases for subclasses in the foregoing classification.All copies of U.S. patents to be found in the following subclasses are cross-reference copies, the originals of which appear in the foregoing subclasses or elsewhere.Therefore, these cross-reference art collections serve primarily either as a starting point in searching this class or an indication of further fields of search inside or outside the class. In no case should any of these collections be considered exhaustive of the subject matter provided for by them.
