LandOfFree - US Patents - Listing for Telephonic communications

Telephonic communications – Special services – Call diversion

Double-registration avoidance method for use in registering subs

Telephonic communications – Echo cancellation or suppression

Double-talk and path change detection using a matrix of...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of hybrid or echo suppressor or canceller

Double-talk detecting apparatus, echo canceller using the...

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

Double-talk detection

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

Double-talk detector

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

Double-talk detector suitable for a telephone-enabled PC

Telephonic communications – Echo cancellation or suppression

Doubletalk detection by means of spectral content

Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit

Downlink activity and double talk probability detector and...

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...

Download booster for ADSL transmission

Telephonic communications – Audio message storage – retrieval – or synthesis

DPNSS VRU with single channel transfer

Telephonic communications – Centralized switching system – Structure of equipment

Drain ground for telephone connector blocks

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing

Drive and method for transferring unbundled network elements...

Telephonic communications – Centralized switching system – Structure of equipment

Drive and positioning method and system for automated switch...

Telephonic communications – Subscriber line or transmission line interface

Drive circuit

Telephonic communications – Audio message storage – retrieval – or synthesis – Dynamic audio signal recording or reproduction

Drive mechanism for a two-tape telephone answering machine using

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network

Drive-by personnel monitoring system with radio link

Telephonic communications – With usage measurement – Call charge metering or monitoring

Drive-in restaurant credit-card transaction system

Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit

Driver circuit and method for driving a signal

Telephonic communications – Subscriber line or transmission line interface

Driver circuit for subscriber terminals