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| Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
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Class 84 | MUSIC |
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| 1 | INSTRUMENTS |
| 600 | Electrical musical tone generation |
| 601 | Data storage |
| 602 | Digital memory circuit (e.g., RAM, ROM, etc.) |
| 603 | Sampling (e.g., with A/D conversion) |
| 604 | Waveform memory |
| 608 | Fourier coefficient memory |
| 609 | Note sequence |
| 615 | Selecting circuits |
| 616 | Fundamental tone detection or extraction |
| 617 | Multiplexing or scanning |
| 618 | Priority or preference circuits |
| 619 | Transposition |
| 620 | Stops |
| 621 | Noise reduction (e.g., error prevention, etc.) |
| 622 | Tone synthesis or timbre control |
| 626 | Expression or special effects (e.g., force or velocity responsive, etc.) |
| 627 | Envelope shaping (i.e., attack, decay, sustain, or release) |
| 628 | Portamento or glissando |
| 629 | Vibrato or tremolo |
| 630 | Reverberation |
| 631 | Chorus, ensemble, or celeste |
| 632 | Chiff or percussive transients |
| 633 | Loudness control |
| 634 | Accompaniment |
| 639 | Photoelectric |
| 641 | Magnetic |
| 643 | Capacitive |
| 644 | Constructional details |
| 645 | MIDI (musical instrument digital interface) |
| 646 | Fret control |
| 647 | Digital combinational circuit |
| 648 | With frequency multiplication or division |
| 649 | Note sequence |
| 653 | Selecting circuits |
| 654 | Fundamental tone detection or extraction |
| 655 | Multiplexing or scanning |
| 656 | Priority or preference circuits |
| 657 | Transposition |
| 658 | Force or velocity responsive |
| 659 | Tone synthesis or timbre control |
| 662 | Expression or special effects |
| 663 | Envelope shaping (i.e., attack, decay, sustain, or release) |
| 664 | Chorus, ensemble, or celeste |
| 665 | Loudness control |
| 666 | Accompaniment |
| 670 | Constructional details |
| 671 | Electric analog oscillators |
| 672 | Variable frequency |
| 675 | With frequency multiplication or division |
| 678 | Selecting circuits |
| 679 | With transistor |
| 680 | With space discharging means |
| 681 | Fundamental tone detection or extraction |
| 682 | Multiplexing or scanning |
| 683 | Noise reduction (e.g., error prevention, etc.) |
| 684 | Priority or preference circuits |
| 685 | Transposition |
| 686 | Stops |
| 687 | Force or velocity responsive |
| 691 | Noise reduction (e.g., error prevention, etc.) |
| 692 | Tone synthesis or timbre control |
| 701 | Expression or special effects |