4. Electrical audio signal processing systems and devices
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Karaoke apparatus having automatic effector control

Electrical audio signal processing systems and devices – Sound effects
Patent

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Karaoke equipment

Electrical audio signal processing systems and devices – Including amplitude or volume control – Automatic
Patent

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Key click masker and method for masking key clicks

Electrical audio signal processing systems and devices – Sound or noise masking
Reexamination Certificate

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Key-actuated volume control

Electrical audio signal processing systems and devices – Including amplitude or volume control – With manual volume control
Patent

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Keyboard comprising a loudspeaker

Electrical audio signal processing systems and devices – Having non-electrical feature – And loudspeaker
Reexamination Certificate

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Kitchen ventilator

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent

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Knockdown speaker

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate

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Knowledge-guided automatic speech recognition apparatus and meth

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent

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