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System of sound transducers with controllable directional...

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Multiple channel
Reexamination Certificate

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System operable as an automaton for recognizing continuously spo

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
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System to block unwanted sound waves and alert while sleeping

Electrical audio signal processing systems and devices – Hearing protectors – electrical
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System, apparatus, and method for improving speech quality...

Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
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System, method and apparatus for adjusting an output of a...

Electrical audio signal processing systems and devices – With amplifier
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Systems and methods for adaptive noise cancellation

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation
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Systems and methods for automatically adjusting the volume...

Electrical audio signal processing systems and devices – Including amplitude or volume control – Remote
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Systems and methods for determining sound of a moving object

Electrical audio signal processing systems and devices – One-way audio signal program distribution
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Systems and methods for interference suppression with...

Electrical audio signal processing systems and devices – Hearing aids – electrical – Directional
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Systems and methods for interference-suppression with...

Electrical audio signal processing systems and devices – Hearing aids – electrical – Directional
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Systems and methods for reducing audio noise

Electrical audio signal processing systems and devices – Noise or distortion suppression – Spectral adjustment
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Systems and methods for selectively switching between...

Electrical audio signal processing systems and devices – Directive circuits for microphones
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Systems and methods for switching and mixing signals in a...

Electrical audio signal processing systems and devices – With amplifier
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Systems for feedback cancellation in an audio interface garment

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