4. Electrical audio signal processing systems and devices
  5. Monitoring/measuring of audio devices
  6. Loudspeaker operation
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Bar code activated speech synthesizer teaching device

Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices – Loudspeaker operation
Patent

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Binary system for generating sound

Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices – Loudspeaker operation
Patent

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