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| Number | Title | Issue Date |
| 8098812 | Method of controlling an adaptation of a filter The invention concerns a method of controlling an adaptation of a filter, and a controller and a computer program product to execute this method. The filter is an adaptive finite impulse response (=FIR) filter for modelling an echo path impulse response for echo can... | 01/17/2012 |
| 8050397 | Multi-tone signal discriminator In one embodiment, a method for discriminating between a machine generated multi-tone signal and a simulated voice multi-tone signal is provided. The method may comprise comparing output profiles generated from sampled outputs of a plurality of filters. The pluralit... | 11/01/2011 |
| 8027461 | Systems and methods for splitting telecommunication signals with reduced noise A telecommunication system has a telecommunication line for communicating a combined signal and a splitter that is coupled to the telecommunication line. The splitter has a high-pass filter, a low-pass filter, and a current limiter. The high-pass filter is configure... | 09/27/2011 |
| 8009823 | System and method for low-power echo and NEXT cancellers A method to design low complexity and low power echo and NEXT cancellers based on wordlength reduction technique is presented. A circuit architecture to implement echo and cancellers is also presented. The low complexity and low power design relies on the fact that ... | 08/30/2011 |
| 7352857 | Method and apparatus for spectral containment over telephone service lines A method for providing spectral containment over telecommunications service lines is provided. The method includes selecting a filter having spectral characteristics corresponding to a predetermined passband. The method also includes connecting the filter in series ... | 04/01/2008 |
| 7313150 | Telecommunications signal relay node A relay node is provided for coupling telephone, facsimile or data terminals to a digital packet telecommunications network. The relay node includes a signal discriminator for determining the type of signal coming from a terminal coupled to the node, from amongst a ... | 12/25/2007 |
| 7227944 | Echo reduction for a headset or handset The present invention provides an echo reduction apparatus, system, and method that advantageously reduces echo when communicating over packet-switched networks. An echo reduction apparatus, including echo reduction circuit, operably couples a headset or handset dev... | 06/05/2007 |
| 7218695 | Method and device for acquiring an estimated value dependent on the maximum of a single-frequency signal The invention relates to a method and device for estimating an estimated value (U2max) dependent on the maximum (Umax) of a single-frequency signal sampled via a succession of sampled values (d(n)), wherein each of a predetermined nu... | 05/15/2007 |
| 7206322 | System and method for using ADSL for introducing multiple derived lines over a single line A system and method for providing a plurality of voice and data communication lines using an ADSL local loop communication line over existing premises wire comprising a network interface device (NID), the NID receiving the ADSL local loop communication line from an ... | 04/17/2007 |
| 7187765 | Method of capturing constant echo path information in a full duplex speakerphone using default coefficients A method of determining when to save default coefficients in an echo canceller so as to ensure that the capture of coefficients that correspond to the best possible echo cancellation in a current condition. Coefficients are saved at varying times depending on the am... | 03/06/2007 |
| 7095846 | Half duplex device and signal processing method thereof A half duplex device and signal processing method thereof. First, a signal detection unit of a signal detector of a half duplex device obtains a short-term power and long-term power. Next, a data update unit of the signal detector sets a short-term power threshold a... | 08/22/2006 |
| 7079646 | ADSL receiver high pass filter architecture An ADSL receiver HPF architecture 300 that reduces the number of Op Amps below that required for known ADSL receiver HPFs. The ADSL receiver HPF 300 is implemented as an active RC filter to provide a single fifth-order Elliptic filter instead of the mo... | 07/18/2006 |
| 7043013 | Method for adaptive control of multichannel acoustic echo cancellation system and device therefor A method for adaptive control of a multi-channel echo cancellation system including N loudspeakers, where N is an integer greater than or equal to 2, and M microphones, where M is an integer greater than or equal to 1. The system includes N×M identification filters... | 05/09/2006 |
| 7039179 | Echo reduction for a headset or handset The present invention provides an echo reduction apparatus, system, and method that advantageously reduces echo when communicating over packet-switched networks. An echo reduction apparatus, including echo reduction circuit, operably couples a headset or handset dev... | 05/02/2006 |
| 7035394 | Tone detector judging a detection of a predetermined tone signal by comparing a characteristic quantity of the tone signal with characteristic quantities of other signals A tone transmission part transmits a tone signal. A tone signal detection part detects data representing an echo signal of the tone signal transmitted by the tone transmission part, and detects data representing a predetermined tone signal targeted to be detected. T... | 04/25/2006 |
| 7035293 | Tone relay A system and method for detecting and removing tones from an incoming communications channel that may also carry other signals such as, for example, voice is disclosed which includes pre-detecting tones in a communication signal, processing the communication signal ... | 04/25/2006 |
| 7020275 | Method and apparatus for spectral containment over telephone service lines A filter passing only desired frequencies is selected according to a desired level of service for copper lines. At a point of access between a loop plant and Central Office, the filter is interposed in series over a telephone service line to provide spectral contain... | 03/28/2006 |
| 7003093 | Tone detection for integrated telecommunications processing Disclosed is an integrated tone detection processor for discriminating between tone and voice signals and determining the tones. The tone detection processor performs Automatic Gain Control (AGC) to normalize the power of the tone or voice signal. Further, the energ... | 02/21/2006 |
| 6978011 | Enhanced low pass filter An ADSL POTS splitter includes an enhanced low pass filter. The enhanced low pass filter includes a first filter capacitor, a first non-isolated inductor, a second non-isolated inductor, a first isolated inductor and a common mode choke. The second non-isolated indu... | 12/20/2005 |
| 6975140 | Adaptive data transmitter having rewriteable non-volatile storage A data transmitter and transmitting method are provided in which an adaptive finite impulse response (FIR) driver has a plurality of taps to which coefficients having updateable values are applied. The FIR driver has a transfer function between an input stream of da... | 12/13/2005 |
| 6952471 | Handset proximity muting Apparatus and methods for automatically (i.e., without requiring manual user adjustment) reducing gain in one or both acoustic feedback paths of a cordless telephone when the handset and its base unit are operating in close proximity to one another, preventing uncon... | 10/04/2005 |
| 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 |
| 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 |
| 6904146 | Full duplex echo cancelling circuit Sub-band filtering, adaptive echo cancellation, and residual echo suppression are selectively and separately applied in hierarchical order under the control of a circuit that monitors four separate signals to determine n machine states. The number of machine states ... | 06/07/2005 |
| 6898280 | Line card and method for supporting pots, asymmetric DSL and symmetric DSL services A line card and method is provided which supports symmetric and asymmetric telecommunication services, such as symmetric and asymmetric DSL services. The line card may support concomitantly POTS and asymmetric DSL services or support DSL services. A xDSL interface p... | 05/24/2005 |
| 6888938 | Dynamically adjustable digital gyrator having extendable feedback for stable DC load line A dynamically adjustable digital gyrator device for a telephone line interface (e.g., a DAA) utilizing extended feedback and a dynamically adjustable filter to achieve stable convergence in the control of DC line current on a telephone line a short period of time. T... | 05/03/2005 |
| 6845252 | Programmable echo cancellation filter Programmable echo cancellation filter for echo signal cancellation for a transceiver having a signal input (13) for receiving the transmission signal emitted by the transceiver (1), an input resistor (36) connected to the signal input (13... | 01/18/2005 |
| 6842516 | Digital adaptive filter and acoustic echo canceller using the same To achieve an improved convergence behaviour for, e.g., echo cancellation there is provided a digital adaptive filter which includes a filter coefficient update means to successively update filter coefficients in accordance with an input signal, an estimated power o... | 01/11/2005 |
| 6842517 | Meter pulse filtering circuit for analog modems A filtering circuit is described for filtering out meter pulses of analog telephone communication, for example in analog modems. The circuit is mainly composed of resistors and capacitors and is configured as a double T element or a Wien bridge circuit. The filterin... | 01/11/2005 |
| 6836546 | Apparatus and method of coupling home network signals between an analog phone line and a digital bus An arrangement for implementing a network in an ISDN-based customer premises having a four-wire ISDN S0 bus. The ISDN-based customer premises includes a Network Termination Basic Access (NTBA) that interfaces between the residential customer premises and the public ... | 12/28/2004 |
| 6831975 | Digital subscriber line (DSL) modem compatible with home networks A cost-effective filter consuming low power and occupying minimal space. The filter may be used in a ADSL modem (or CPE) to filter the signal components other than the ADSL signals. A high pass filter first filters the low frequency components to attenuate (or remov... | 12/14/2004 |
| 6795547 | Full duplex speaker-phone providing increased loop stability A full duplex speaker-phone that performs adaptive filtering to provide increased loop stability between users of the speaker-phone. The invention employs a sliding filter that performs adaptive frequency dependent attenuation of the speech signals within a speaker-... | 09/21/2004 |
| 6792107 | Double-talk detector suitable for a telephone-enabled PC A double-talk detector (109) for an acoustic echo canceler (104) of a VoIP terminal (101) converts (216,226) received far-end signals (212) and transmitted near-end signals (222) into the frequency domain and high-pass filte... | 09/14/2004 |
| 6751313 | Method and apparatus for an improved echo canceller Method and apparatus for an improved echo canceller provide for faster convergence in echo canceling, which also contribute to better voice quality and provide for an increase in the capacity (number of channels) of a multi-channel voice processing products. Whiteni... | 06/15/2004 |
| 6711260 | Method and apparatus for spectral containment over telephone service lines A filter passing only desired frequencies is selected according to a desired level of service for copper lines. At a point of access between a loop plant and Central Office, the filter is interposed in series over a telephone service line to provide spectral contain... | 03/23/2004 |
| 6691073 | Adaptive state space signal separation, discrimination and recovery This invention unifies a set of statistical signal processing, neuromorphic systems, and microelectronic implementation techniques for blind separation and recovery of mixed signals. A set of architectures, frameworks, algorithms, and devices for separati... | 02/10/2004 |
| 6608898 | Band pass and notch filters for echo reduction with less phase distortion A complementary comb filter includes a plurality of band pass filters and a plurality of notch filters, wherein the notch filters have the same center frequencies as the band pass filters or the same center frequencies as the dead bands defined by the ban... | 08/19/2003 |
| 6570985 | Echo canceler adaptive filter optimization The Least Mean Square (LMS) and Normalized LMS (NLMS) algorithms commonly employed in adaptive filters of echo cancelers are further optimized. Finite impulse response (FIR) filters are used to estimate a transfer function of an echo channel in a communic... | 05/27/2003 |
| 6553118 | Method and apparatus for calculating DC offset in a digital gyrator A method and apparatus for controlling the DC line current on a telephone line and reducing the amount of error introduced to the system. The error is reduced by compensating for a DC error term introduced by an analog to digital converter having a DC off... | 04/22/2003 |
| 6044150 | Method and apparatus for a host-based personal computer speakerphone A method and apparatus for implementing a speakerphone within a personal computer having a voice-capable modem and an audio board is provided. The personal computer executes host software providing the user interface for speakerphone operation and the ind... | 03/28/2000 |
