4. Electrical audio signal processing systems and devices
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BTL amplifier apparatus

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

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BTSC encoder

Electrical audio signal processing systems and devices – Including amplitude or volume control – With amplitude compression/expansion
Patent

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BTSC encoder

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

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BTSC encoder and integrated circuit

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

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BTSC encoder and integrated circuit

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

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Built-in microphone device

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation
Reexamination Certificate

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Bulb type speaker structure

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Mounting or support feature of housed loudspeaker
Reexamination Certificate

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Button apparatus with a speaker

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

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