4. Electrical audio signal processing systems and devices
  5. Headphone circuits
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Supplying electrical power

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

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Surround headphone output signal generator

Electrical audio signal processing systems and devices – Headphone circuits
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System and apparatus for speech communication and speech...

Electrical audio signal processing systems and devices – Headphone circuits
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System and method for controlling states of a device

Electrical audio signal processing systems and devices – Headphone circuits
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System and method for engaging in conversation while using...

Electrical audio signal processing systems and devices – Headphone circuits
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System for producing an artificial sound environment

Electrical audio signal processing systems and devices – Headphone circuits
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Tri-functional dual earphone device

Electrical audio signal processing systems and devices – Headphone circuits
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Wireless headset

Electrical audio signal processing systems and devices – Headphone circuits
Patent

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