4. Electrical audio signal processing systems and devices
  5. One-way audio signal program distribution
  6. Public address system

William R. Belfield

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Adaptive prediction

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
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Password controlled switching system

Telephonic communications – Audio message storage – retrieval – or synthesis – Multilingual system or operation
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Wideband adaptive prediction

Pulse or digital communications – Repeaters – Testing
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Profile ID: LFUS-PAI-P-759828

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