4. Electrical audio signal processing systems and devices
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Ambient imaging loudspeaker system

Electrical audio signal processing systems and devices – Binaural and stereophonic – Hearing aid
Patent

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Ambient noise canceling physiological acoustic monitoring...

Electrical audio signal processing systems and devices – Stethoscopes – electrical
Reexamination Certificate

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Ambient noise isolation audio headphones having a layered...

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Reexamination Certificate

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Ambient noise sound level compensation

Electrical audio signal processing systems and devices – Monitoring of sound – Amplification control responsive to ambient sound
Reexamination Certificate

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Ambient noise suppression circuit

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

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Ambient noise-reduction system

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Counterwave generation control path
Reexamination Certificate

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Ambient sound audio system

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

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Amphibious personal audio system

Electrical audio signal processing systems and devices – Headphone circuits
Patent

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Amplifier arrangement for acoustic signals, provided with means

Electrical audio signal processing systems and devices – Feedback suppression
Patent

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Amplifier circuit for a condenser microphone system

Electrical audio signal processing systems and devices – Directive circuits for microphones
Patent

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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
Reexamination Certificate

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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
Reexamination Certificate

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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
Reexamination Certificate

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Amplifier circuitry with mode compensation and selectable gain a

Electrical audio signal processing systems and devices – Sound effects
Patent

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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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Amplifier filter system for speech therapy

Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent

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Amplifier for a guitar or other musical instrument

Electrical audio signal processing systems and devices – Sound effects
Patent

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Amplifier having maximum summed power output from a plurality of

Electrical audio signal processing systems and devices – With amplifier
Patent

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Amplifier power supply controlled by audio signal

Electrical audio signal processing systems and devices – Voice controlled
Patent

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