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

Ryujiro Muramatsu

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Speech coding system using variable threshold values for noise r

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

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Telephone communication terminal and communication method

Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
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Telephone exchange network using telephone exchanges with speech

Telephonic communications – Audio message storage – retrieval – or synthesis
Patent

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Profile ID: LFUS-PAI-P-1204608

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