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2-wire/3-wire converting apparatus

Telephonic communications – Subscriber line or transmission line interface
Patent

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Access network with an integrated splitter

Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate

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Acoustic echo cancellation in an integrated audio and telecommun

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Acoustic echo canceller with fast volume control compensation

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Reexamination Certificate

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Acoustical echo canceller having an adaptive filter with passage

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Acoustical echo canceller with sub-band filtering

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Active audio compressing in telecommunication

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Reexamination Certificate

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Active impedance line feed circuit

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Active mode line voltage regulator for ringing subscriber...

Telephonic communications – Subscriber line or transmission line interface
Reissue Patent

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Active mode line voltage regulator for ringing subscriber...

Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate

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Active surge rejection circuit

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Adaptable line driver interface for digital telephone systems

Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate

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Adapter card implementing a time-shared digital signal...

Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate

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Adaptive echo cancellation and equalization system signal proces

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Adaptive echo cancellation apparatus

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Adaptive echo cancellation method

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Adaptive echo cancellation method and device for implementing sa

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Adaptive echo canceller

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Adaptive echo canceller with sparse dynamically positioned taps

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Adaptive echo cancelling system for telephony applications

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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