4. Electrical audio signal processing systems and devices
  5. Circuitry combined with specific type microphone or loudspeaker
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Impedance converter for a condenser microphone

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

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Integrated amplifier and speaker system with improved cooling ef

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

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Integrated audio codec with silicon audio transducer

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

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Interfacing circuit for a removable microphone

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

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