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Echo canceling apparatus and method, and voice reproducing...

Telephonic communications – Echo cancellation or suppression – Combined diverse function
Reexamination Certificate

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Echo cancellation filter

Telephonic communications – Echo cancellation or suppression – Combined diverse function
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Echo cancellation method and apparatus

Telephonic communications – Echo cancellation or suppression – Combined diverse function
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Echo canceller and echo cancelling method

Telephonic communications – Echo cancellation or suppression – Combined diverse function
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Echo canceller employing dual-H architecture having variable...

Telephonic communications – Echo cancellation or suppression – Combined diverse function
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Electricity echo cancellation device and method

Telephonic communications – Echo cancellation or suppression – Combined diverse function
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Enhancement of near-end voice signals in an echo suppression...

Telephonic communications – Echo cancellation or suppression – Combined diverse function
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