US Patent Class 381
ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES-- Main Headings



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Current as of: June, 1999
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CLASS NOTES
1  DF  BINAURAL AND STEREOPHONIC {8}
54  DF  HELIUM SPEECH
55  DF  AUDIO TRANSDUCER PROTECTION CIRCUITRY
56  DF  MONITORING OF SOUND {1}
58  DF  MONITORING/MEASURING OF AUDIO DEVICES {2}
61  DF  SOUND EFFECTS {2}
66  DF  DEREVERBERATORS
67  DF  STETHOSCOPES, ELECTRICAL
312  DF  HEARING AIDS, ELECTRICAL {9}
70  DF  ARTIFICIAL LARYNX, ELECTRICAL
71.1  DF  ACOUSTICAL NOISE OR SOUND CANCELLATION {7}
72  DF  HEARING PROTECTORS, ELECTRICAL
73.1  DF  SOUND OR NOISE MASKING
74  DF  HEADPHONE CIRCUITS
75  DF  MEGAPHONES
76  DF  LECTERNS
77  DF  ONE-WAY AUDIO SIGNAL PROGRAM DISTRIBUTION {4}
86  DF  VEHICLE
87  DF  HAVING NON-ELECTRICAL FEATURE (E.G., MOUNTING) {3}
92  DF  DIRECTIVE CIRCUITS FOR MICROPHONES
93  DF  FEEDBACK SUPPRESSION
94.1  DF  NOISE OR DISTORTION SUPPRESSION {7}
95  DF  MICROPHONE FEEDBACK
96  DF  LOUDSPEAKER FEEDBACK
97  DF  INCLUDING PHASE CONTROL
98  DF  INCLUDING FREQUENCY CONTROL {3}
104  DF  INCLUDING AMPLITUDE OR VOLUME CONTROL {4}
110  DF  VOICE CONTROLLED
111  DF  CIRCUITRY COMBINED WITH SPECIFIC TYPE MICROPHONE OR LOUDSPEAKER {6}
118  DF  WITH MUSICAL INSTRUMENT
119  DF  WITH MIXER
120  DF  WITH AMPLIFIER {1}
122  DF  HAVING MICROPHONE
123  DF  SWITCHING
150  DF  ELECTRO-ACOUSTIC AUDIO TRANSDUCER {18}
124  DF  MISCELLANEOUS
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FOREIGN ART COLLECTIONS
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FOR 100  DF  AUDIO BANDWIDTH COMPRESSION OR EXPANSION (381/29) {2}
FOR 103  DF  TIME COMPRESSION OR EXPANSION (E.G., RUN LENGTH CODING) (381/34) {1}
FOR 105  DF  SPEECH ANALYSIS AND SYNTHESIS COMBINED (381/36) {2}
FOR 110  DF  SPEECH ANALYSIS (E.G., PHONEME RECOGNITION) (381/41) {7}
FOR 120  DF  SPEECH SYNTHESIS (381/51) {2}
FOR 123  DF  ACOUSTICAL NOISE OR SOUND CANCELLATION (381/71)
FOR 124  DF  NOISE SUPPRESSION (381/94)
*  DF  BINAURAL AND STEREOPHONIC {1}
FOR 127  DF  HEARING AIDS, ELECTRICAL (381/68) {15}