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Class Information
Number: 381/203
Name: Electrical audio signal processing systems and devices >
Description:

Sub-classes under this class:

Class Number	Class Name	Patents
381/	Binaural and stereophonic	0
381/1	Binaural and stereophonic	581
381/104	Including amplitude or volume control	632
381/110	Voice controlled	203
381/111	Circuitry combined with specific type microphone or loudspeaker	385
381/118	With musical instrument	139
381/119	With mixer	580
381/120	With amplifier	509
381/122	Having microphone	404
381/123	Switching	372
381/124	Miscellaneous	115
381/150	Electro-acoustic audio transducer	157
381/312	Hearing aids, electrical	941
381/54	Helium speech	8
381/55	Audio transducer protection circuitry	127
381/56	Monitoring of sound	640
381/58	Monitoring/measuring of audio devices	521
381/61	Sound effects	599
381/66	Dereverberators	241
381/67	Stethoscopes, electrical	183
381/70	Artificial larynx, electrical	40
381/71.1	Acoustical noise or sound cancellation	455
381/72	Hearing protectors, electrical	175
381/73.1	Sound or noise masking	168
381/74	Headphone circuits	530
381/75	Megaphones	24
381/76	Lecterns	8
381/77	One-way audio signal program distribution	475
381/86	Vehicle	771
381/87	Having non-electrical feature (e.g., mounting)	209
381/92	Directive circuits for microphones	760
381/93	Feedback suppression	278
381/94.1	Noise or distortion suppression	696
381/95	Microphone feedback	95
381/96	Loudspeaker feedback	281
381/97	Including phase control	223
381/98	Including frequency control	681