4. Electrical audio signal processing systems and devices
  5. Monitoring of sound
  6. Amplification control responsive to ambient sound
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Automatic volume control circuit

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

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Automatic volume control to compensate for ambient noise variati

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

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Automatic volume controlling apparatus

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

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