4. Electrical audio signal processing systems and devices
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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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Teleconference system using expanders for emphasizing a desired

Electrical audio signal processing systems and devices – Including amplitude or volume control – With amplitude compression/expansion
Patent

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Telephone handset amplifier circuit

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

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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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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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Triphonic sound system

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

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