4. Electrical audio signal processing systems and devices
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Audio amplifier switch-on control circuit

Electrical audio signal processing systems and devices – Noise or distortion suppression – Interpolation
Patent

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Audio amplifier system using a class D amplifier

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

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Audio amplifier system with improved isolation between preamplif

Electrical audio signal processing systems and devices – Noise or distortion suppression – Hum or ground loop
Patent

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Audio amplifier unit

Electrical audio signal processing systems and devices – Binaural and stereophonic – Stereo speaker arrangement
Reexamination Certificate

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Audio amplifier with voltage limiting in response to...

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

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Audio amplifiers

Electrical audio signal processing systems and devices – With amplifier
Patent

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Audio and video signal distribution system and method

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

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Audio apparatus

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

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Audio apparatus

Electrical audio signal processing systems and devices – Headphone circuits
Patent

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Audio apparatus

Electrical audio signal processing systems and devices – Including frequency control – Having automatic equalizer circuit
Patent

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Audio apparatus

Electrical audio signal processing systems and devices – With amplifier
Reexamination Certificate

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Audio apparatus

Electrical audio signal processing systems and devices – One-way audio signal program distribution
Reexamination Certificate

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Audio apparatus and method for use in proximity to a...

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

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Audio apparatus demonstrating

Electrical audio signal processing systems and devices – Noise or distortion suppression – Interpolation
Patent

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Audio apparatus for reducing white noise and control method...

Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices
Reexamination Certificate

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Audio apparatus for vehicle

Electrical audio signal processing systems and devices – Vehicle
Patent

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Audio apparatus having a karaoke function

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

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Audio apparatus having electronic graphic equalizer

Electrical audio signal processing systems and devices – Including frequency control – Having automatic equalizer circuit
Patent

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Audio apparatus having tuner unit and digital reproducing unit

Electrical audio signal processing systems and devices – Switching
Reexamination Certificate

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Audio apparatus of negative driving with adaptive gain control

Electrical audio signal processing systems and devices – With amplifier – Feedback
Reexamination Certificate

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