4. Electrical audio signal processing systems and devices
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Multipurpose headwear

Electrical audio signal processing systems and devices – Binaural and stereophonic – Hearing aid
Patent

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Multirate digital transmission method and device for implementin

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

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Multirate digital transmission method and device for implementin

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

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Multispeaker sound imaging system

Electrical audio signal processing systems and devices – Binaural and stereophonic – Pseudo stereophonic
Reexamination Certificate

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Multivoice signal switching circuit

Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent

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Music apparatus with dynamic change of effects

Electrical audio signal processing systems and devices – Sound effects
Reexamination Certificate

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Music reproduction apparatus, audio player, and headphone

Electrical audio signal processing systems and devices – Headphone circuits
Reexamination Certificate

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Music spatialisation system and method

Electrical audio signal processing systems and devices – Sound effects
Reexamination Certificate

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Music speech filter

Electrical audio signal processing systems and devices – Voice controlled
Patent

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Music tone pitch shift apparatus

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

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Music/voice discriminating apparatus

Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Patent

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Musical bench

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

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Musical massager

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Body contact wave transfer
Patent

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Musical sound reproduction controller with two-stage adjustment

Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent

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Mute apparatus and mute method

Electrical audio signal processing systems and devices – Switching
Reexamination Certificate

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Mute circuit for a microphone

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker
Reexamination Certificate

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Mute circuit for audio amplifiers

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

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Mute circuit for use with switching relays

Electrical audio signal processing systems and devices – Noise or distortion suppression – Soft switching – muting – or noise gating
Reexamination Certificate

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Mute switch

Electrical audio signal processing systems and devices – Noise or distortion suppression – Soft switching – muting – or noise gating
Reexamination Certificate

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Muting circuit

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

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