4. Electrical audio signal processing systems and devices
  5. Including amplitude or volume control
  6. Automatic
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Talker speech level control circuit for telephone transmitter by

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

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Techniques for improving audio clarity and intelligibility...

Electrical audio signal processing systems and devices – Including amplitude or volume control – Automatic
Reexamination Certificate

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Thermal feedback for switch mode amplification

Electrical audio signal processing systems and devices – Including amplitude or volume control – Automatic
Reexamination Certificate

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Triphonic sound system

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

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