4. Coded data generation or conversion
  5. Analog to or from digital conversion
  6. Digital to analog conversion

Herman Chung

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Cycle-modulating type of dual-tone multifrequency generator

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Waveform-generating apparatus

Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent

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Profile ID: LFUS-PAI-P-887814

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