(under subclass 317) Subject matter in which the particular kind of undesired signal is howling or screeching caused by a return to the hearing aid's input of a sufficient fraction of its output to cause oscillation.
(1) Note. Hearing aid feedback normally occurs via an acoustic path.
SEE OR SEARCH THIS CLASS, SUBCLASS:
83, for feedback suppression circuitry in a public address system.
93, for generic feedback circuitry under the class definition.
