4. Electrical audio signal processing systems and devices
  5. Headphone circuits
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Earphone with control device of timing call setting

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

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Electret microphone detection using a current source

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

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Electronic device accessory with ultrasonic tone generator

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

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Electronic interfacing with a head-mounted device

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

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