4. Electrical audio signal processing systems and devices
  5. Including amplitude or volume control

William A. Williamson, III

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Automatic gain control for a headset

Electrical audio signal processing systems and devices – Including amplitude or volume control
Patent

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Methods for detecting defective communications lines

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Reexamination Certificate

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Tone reduction circuit for headsets

Electrical audio signal processing systems and devices – Including amplitude or volume control
Patent

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Tone suppression automatic gain control for a headset

Electrical audio signal processing systems and devices – Including amplitude or volume control
Patent

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Profile ID: LFUS-PAI-P-175481

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