4. Pulse or digital communications
  5. Systems using alternating or pulsating current
  6. Plural channels for transmission of a single pulse train

Roland Hug

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Apparatus and method for echo-cancellation

Telephonic communications – Echo cancellation or suppression – Using digital signal processing
Reexamination Certificate

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Time domain equalization using frequency domain operations

Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate

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Profile ID: LFUS-PAI-P-3194175

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