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A/D converter with integrated biasing for a 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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Acoustic sensor and electric stethoscope device...

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With piezoelectric microphone
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Active electronic noise suppression system and method for reduci

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

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Alternative sensing circuit for MEMS microphone and sensing...

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

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Amplifier circuit for capacitive transducers

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With electrostatic microphone
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Amplifier circuit for electret condenser microphone

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

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Amplifier circuit for electret microphone with enhanced...

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With electrostatic microphone
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Amplifier circuit for electret microphone with enhanced...

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker
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Amplifier device for a condenser microphone

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

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Apparatus and method for providing proper microphone DC bias cur

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

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Apparatus and method to provide advanced microphone bias

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

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Apparatus for reproducing sound with a reduced dynamic range

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

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Audio A/D converter using frequency modulation

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With piezoelectric microphone
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Audio A/D convertor using frequency modulation

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

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

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Audio input circuit for voice recognition

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

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Audio processing method and system

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With electrostatic microphone
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Audio signal recording apparatus

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