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| Number | Title | Issue Date |
| 7072465 | Adaptive filter for network echo cancellation A robust adaptive filter for use in a network echo canceller or other digital signal processing application utilizes a coefficient vector update device that, through the application of fast converging algorithms to a fast impulse response filter yields fast converge... | 07/04/2006 |
| 7068793 | Method of automatically fitting hearing aid Provided is a method of automatically fitting a hearing aid. The method includes the steps of entering an audiogram of a test subject, defining criterion gains and SSPLs according to the test subject's audiogram in each test frequency band, generating 70dB SPL long ... | 06/27/2006 |
| 7065207 | Controlling attenuation during echo suppression An echo canceling system receives and transmits audio signals between a far end and a near end. During single talk, which is when only one end is originating audio, the path back to the originator is impeded by echo cancellation and attenuation. When there is double... | 06/20/2006 |
| 6990196 | Crosstalk identification in xDSL systems Methods, apparatus and systems for identifying crosstalk interference in xDSL systems are disclosed and are useful in a variety of xDSL systems to assist in the provisioning, maintenance and diagnosis of the xDSL system and in spectral management and assignments. Si... | 01/24/2006 |
| 6978007 | Communications systems The communications system has a transmission network for transmitting useful data and control data. Call numbers are input at a subscriber terminal. A subscriber line unit with an adjustable transmission characteristic is connected between the subscriber terminal an... | 12/20/2005 |
| 6978009 | Microprocessor-controlled full-duplex speakerphone using automatic gain control A near full duplex portable handset speakerphone comprises: a microprocessor; a hands-free receive register connected to the microprocessor; a hands-free transmit register connected to the microprocessor; a ROM having a speakerphone operation algorithm, the ROM conn... | 12/20/2005 |
| 6978014 | Apparatus for providing power to line drivers in a communication system The apparatus for provides power to selected line drivers in a communication system. Each selected line driver has a respective inherent internal voltage drop. Each selected line driver is coupled with a respective communication loop for providing a respective minim... | 12/20/2005 |
| 6973184 | System and method for stereo conferencing over low-bandwidth links Systems and methods are disclosed for packet voice conferencing. An encoding system accepts two sound field signals, representing the same sound field sampled at two spatially-separated points. The relative delay between the two sound field signals is detected over ... | 12/06/2005 |
| 6968055 | DC holding circuit DC holding circuitry that may be implemented with other parts of a DAA circuit to terminate a telephone connections at the user's end. The DC holding circuitry may be implemented using a synthesized inductor circuit powered by DC termination circuitry of a DAA telep... | 11/22/2005 |
| 6959083 | Loop current monitor circuitry and method for a communication system An audio signal processor which modifies audio signal components outside the conventional audio frequency band. The processor includes a Delta Sigma Modulator (DSM) that receives a non-interpolated digital audio signal sampled at a frequency of at least 198 kHz.... | 10/25/2005 |
| 6950512 | Circuit arrangement for forming the termination of an analogous subscriber line The invention relates to a circuit arrangement for forming the termination of an analogous subscriber line which comprises a first connection and a second connection for connecting a twin-wire analogous subscriber line. Said first connection is linked with said seco... | 09/27/2005 |
| 6950515 | Telecommunication system using digital-subscriber lines coexisting with TCM-ISDN lines Provided is an asymmetric digital subscriber line (ADSL) system that communicates via digital subscriber line (DSL) routing through a bundle of cables including a communication line for time compression multiplexing-integrated services digital network (TCM-ISDN) sys... | 09/27/2005 |
| 6947554 | Least mean power consumption in telecommunications systems A programmable access point (110) has a line driver (201), sensors (202), comparator and control logic (203), a power supply (206), and a backup power supply (207). The line driver (201) provides power and communicati... | 09/20/2005 |
| 6947529 | DSL compatible load coil A load coil is disposed along a local loop for conditioning POTS signals while permitting passage of higher frequency DSL signals with low attenuation. In one embodiment, the load coil includes a coupled inductor having multiple capacitive elements coupled thereto, ... | 09/20/2005 |
| 6947530 | Adaptive pilot tone location in a transmission system A system selects a tone at which a pilot sequence is to be transmitted. The system includes logic configured to adaptively select a tone on which the pilot sequence is transmitted based one or more conditions in the transmission system. ... | 09/20/2005 |
| 6944284 | Pulsed volume control of a magnetic ringer A digital circuit for driving an audio transducer that provides consistent tonal quality over a range of volume levels, without requiring a variable gain analog amplifier. A fixed amplitude ringer tone is multiplied, or amplitude modulated, by a higher frequency dig... | 09/13/2005 |
| 6944282 | Arrangement for using a number of modifiable settings The invention concerns arrangements whereby a number of modifiable settings can be used, where at least some of these settings are stored as individual values in a memory and are or become available to a user as preset values. To that end it is proposed to store the... | 09/13/2005 |
| 6940964 | Push-button signal receiving circuit and a method of detecting a push-button signal A push-button signal receiving circuit and a push-button signal detection method are provided which can enhance frequency detection accuracy and yet can reduce erroneous determination as to the valid length of PB signal and thus erroneous operation. Valid signal det... | 09/06/2005 |
| 6940968 | Telephone terminal apparatus and method A telephone apparatus comprises a first audio input device, a second audio input device, a first audio output device, and a second audio output device. The telephone apparatus is operative to couple the first audio input device and the first audio output device to a... | 09/06/2005 |
| 6937720 | xDSL class C-AB driver A line driver having a non-linear amplifier that is arranged to provide a first output signal, which is an amplified input signal. The line driver also includes an analog linear amplifier providing a second output signal based on the difference between the input sig... | 08/30/2005 |
| 6937719 | Multiplexing and demultiplexing of narrowband and broadband services in a transmission connection The invention relates to the implementation of narrowband and broadband services in a telecommunications network. A splitter element is connected to a transmission link, the splitter element comprising a passive low-pass filter block connected between the transmissi... | 08/30/2005 |
| 6931101 | Method and apparatus for inband testing of an echo canceller Provided is a method and apparatus for inband testing of an echo canceller. The apparatus includes a signal generator for generating an excitation signal including a preamble portion and a test portion. The echo canceller receives the excitation signal at a decoder.... | 08/16/2005 |
| 6928160 | Estimating bulk delay in a telephone system A bulk delay estimating circuit matches time intervals representing a signal with time intervals representing an echo of the signal to identify the echo and estimate bulk delay. Bulk delay is estimated by computing (1, 2, . . . n) intervals representing the signal, ... | 08/09/2005 |
| 6928161 | Echo cancellation apparatus, systems, and methods An echo cancellation unit includes a model store to store a current echo model from an adaptive filter when a real-time error occurs. The real-time error is detected by monitoring a convergence metric. In some embodiments, the convergence metric is echo return loss ... | 08/09/2005 |
| 6928159 | Telephone for connection to a public telephone network In the case of the inventive telephone, telephone operating signals (bell signal, charge-unit signals and caller identifiers) and audio signals are processed together by an integrated circuit. This requires signal level matching to be performed for the individual si... | 08/09/2005 |
| 6925177 | Echo canceler compensating for amplifier saturation and echo amplification An echo canceler having a predictive filter that generates an echo replica signal and an adder that subtracts the echo replica signal from a send input signal also has a receive input amplifier and a clipping circuit. The clipping circuit clips the input to the pred... | 08/02/2005 |
| 6920217 | Method and apparatus for transient suppression in an integrated POTS/DSL line card Combined plain old telephone system (POTS) and digital subscriber loop (DSL) line card capable of suppressing low frequency transients. The line card includes the following elements. A DSL receive path receives DSL data from a loop. A POTS receive path receives POTS... | 07/19/2005 |
| 6917688 | Adaptive noise cancelling microphone system An adaptive noise canceling microphone system for extracting a desired signal, in particular a desired speech signal, comprising two microphones being arranged at a predefined distance from each other; a signal forming system (SFS) being adapted to receive a first a... | 07/12/2005 |
| 6909781 | DSL line tester An analog front end system comprising a digital-to-analog converter, a line driver, a multiple-input device, and an analog-to-digital converter is presented. Furthermore, a method for DSL line testing comprising the steps of providing test stimuli to and receiving r... | 06/21/2005 |
| 6891955 | Audio volume control for computer systems A computer system includes an audio chip to generate audio signals at a target volume level to be emitted as audio output by speakers. Also included in the computer system may be a volume control routine to limit the overall volume level of the system. A maximum vol... | 05/10/2005 |
| 6873701 | System and method for DTMF detection using likelihood ratios A system and method for determining DTMF coefficients stores a plurality of reference templates, at least some of said reference templates representative of likelihood ratios. A plurality of LPC coefficients is received. The LPC coefficients are representative of an... | 03/29/2005 |
| 6873705 | Combine audio and ringing mode A circuit where the same amplifiers and the same volume adjustment circuitry are used for the ringer mode as well as for the audio mode of a mobile phone is achieved. The volume adjustment in the audio and ringer mode is provided by a precise amplitude setting via t... | 03/29/2005 |
| 6865271 | Constant current line circuit with class features A line circuit utilizing a differential amplifier whose output is regulated to zero volts D.C. (when the subscriber's set is off-hook) by a negative feedback circuit, for controlling a voltage controlled power supply which provides a constant current feed to the sub... | 03/08/2005 |
| 6856682 | System and method for processing an input signal communicated on a telephone line In one embodiment, a system is provided for processing an input signal communicated on a telephone line, the input signal including a first component associated with a first frequency band, a second component associated with a second frequency band higher than the f... | 02/15/2005 |
| 6842519 | Communication with current detection Apparatuses and methods are disclosed for communications using current detection. According to one embodiment, a transmitter generates a signal on a transmission line by switching between two power sources. According to one embodiment, the transmitted signal is a ba... | 01/11/2005 |
| 6836543 | Operating surface for class functions in a telephone An operating surface for CLASS functions of a telephone device of an analog network. The operating surface has two functions, “activate” and “deactivate”, so that the command sequence following the “activate” function is interpreted as CLASS function and... | 12/28/2004 |
| 6831976 | Telephone line-powered power supply for ancillary equipment and method of operation thereof A telephone line-powered power supply, a method of operating the same and telephone line-powered ancillary equipment. In one embodiment, the power supply includes: (1) a transformer having a primary winding and a secondary winding and (2) an energy storage device (w... | 12/14/2004 |
| 6829336 | System and method for active filtering in a telecommunications network A filtering device (50) for active filtering at a customer premises includes an input interface that receives telephone signals and digital data signals communicated from a central office (14) using a telephone line (12). The filtering device ( | 12/07/2004 |
| 6826265 | DSL-ready pots device and method A plain old telephone system (POTS) device, for example but not limited to, a telephone, facsimile machine, analog modem, caller identification (ID) system, speaker phone, cordless phone, etc., employs an on-board POTS filter to enable reliable and efficient decoupl... | 11/30/2004 |
| 6826277 | Method for registering and searching dialing information in a communication apparatus A method for registering dialing information contemplates the steps of: inputting dialing information for storage in a dial buffer; registering in memory the dialing information stored in the dial buffer; sorting the dialing information registered in memory in an or... | 11/30/2004 |
