Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 8340278 | Method and apparatus for cross-talk resistant adaptive noise canceller A method and apparatus for cross-talk resistant adaptive noise cancellation. The method includes retrieving, via the processor, a primary signal and a reference signal, filtering the primary signal utilizing a filter H12(z) and estimating a cross-talk, fi... | 12/25/2012 |
| 8265263 | Delayed adaptation structure for improved double-talk immunity in echo cancellation devices In a system having an adaptive filter block for receiving a reference signal and adapting to an input signal, and a block for detecting corruption of the input signal by an interference signal and in response limiting adaptation of the adaptive filter block, the imp... | 09/11/2012 |
| 8259928 | Method and apparatus for reducing timestamp noise in audio echo cancellation A communication end device of a two-way communication system is shown. The device includes an audio signal capture device for capturing local audio to be transmitted to another end device, an audio signal rendering device for playing remote audio received from the o... | 09/04/2012 |
| 8014517 | Method and apparatus for enhanced convergence of the normalized LMS algorithm Adaptive filters employing a normalized time domain least mean square algorithm having enhanced convergence rates by virtue of the use of an update gain greater than 2 λ max | 09/06/2011 |
| 7783032 | Method and system for processing subband signals using adaptive filters A method and system for processing subband signals using adaptive filters is provided. The system is implemented on an oversampled WOLA filterbank. Inputs signals are oversampled. The system includes an adaptive filter for each subband, and the functionality of impr... | 08/24/2010 |
| 7366657 | Voice signal processing system mounted with echo canceller and voice signal processing method In order to prevent generation of a trapezoidal signal waveform due to limitations on dynamic ranges in an echo canceller and an echo path as voice signal transmission paths, a voice signal processing circuit of the voice signal processing system processes a wavefor... | 04/29/2008 |
| 7358875 | Echo preventing circuit and digital signal processing circuit An echo preventing circuit comprises a filter that is inputted with a first digital signal and outputs a second and a third digital signals; a first DA converter that converts the second digital signal into a first analog signal and outputs the first analog signal; ... | 04/15/2008 |
| 7353217 | Intelligent realtime management of processing resources A method and system for ordering a priority for a function to receive any type of processing resources in a system that includes a plurality of functions. The invention includes identifying a plurality of instances of the functions that use processing resources. The... | 04/01/2008 |
| 7327995 | Active resistance summer for a transformer hybrid A transmit canceller comprises an operational amplifier having a first polarity input terminal, a second polarity input terminal, and an output terminal. A feedback element communicates with the second polarity input terminal and the output terminal. A first input r... | 02/05/2008 |
| 7260163 | Noise blanker using an adaptive all-pole predictor and method therefor A noise blanker (40, 106) monitors and removes noise from a sampled signal by adaptive filtering (98, 150) the sampled signal to generate trained adaptive filter prediction coefficients. The sampled signal is provided as an output signal when the noise... | 08/21/2007 |
| 7248629 | Efficient FIR filter for high-speed communication A method for reducing a propagation delay of a digital filter. The digital filter has an input path and an output path and includes a set of delay elements and a number of taps. The taps couples the input path to the output path. Each of the taps includes a coeffici... | 07/24/2007 |
| 7248708 | Noise canceling microphone An improved noise canceling microphone is provided including robust design features and advanced noise control and speech discrimination convergence characteristics. Two adaptive controllers are used to ensure robust performance in quickly changing acoustic environm... | 07/24/2007 |
| 7243065 | Low-complexity comfort noise generator A comfort noise generator (104) suitable for use in a communication system includes a finite impulse response (FIR) filter (136), a random number generator (140), and a coefficient updater (138). The coefficient updater (138) deter... | 07/10/2007 |
| 7242762 | Monitoring and control of an adaptive filter in a communication system A communication system having an echo canceller is disclosed. One embodiment of the echo canceller includes an adaptive filter used to provide an estimate of reflected echo which is removed from the send signal. The echo canceller may also include a near-end talker ... | 07/10/2007 |
| 7212841 | Telephone apparatus and a communication method using such apparatus In accordance with a first aspect of the present invention there is provided a telephone apparatus including a transmitter portion and a receiver portion, an input transducer for converting input audio signals into electrical signals, a connectable input link betwee... | 05/01/2007 |
| 7200222 | Echo canceller employing dual-H architecture having variable adaptive gain settings An echo canceller circuit for use in an echo canceller system is set forth that provides sensitive double-talk detection. The echo canceller circuit comprises a second digital filter having adaptive tap coefficients to simulate an echo response occurring during the ... | 04/03/2007 |
| 7200221 | Methods and systems for providing multi-path echo cancellation Providing multi-path echo cancellation comprises providing a main echo signal corresponding to a main echo section of an echo response and providing a plurality of tail echo signals, each of the plurality of tail echo signals corresponding to respective tail echo se... | 04/03/2007 |
| 7190775 | High quality audio conferencing with adaptive beamforming Systems and methods that enable high quality audio teleconferencing are disclosed. In one embodiment of the present invention, a signal processor receives signals from a spatially dispersed set of directional microphones, processing the microphone signals and the fa... | 03/13/2007 |
| 7181001 | Apparatus and method for echo cancellation An apparatus and method for echo cancellation that detects and tracks the active regions of the echo channel impulse response rather than the entire echo channel impulse response and uses this sparse model to cancel the echo component of the received signal. Two set... | 02/20/2007 |
| 7177419 | Methods and apparatuses for detecting and reducing non-linear echo in a multi-carrier communication system Apparatuses, systems, and methods for a multi-carrier communication system that detects and reduces an echo from a non-linear element present on the transmission medium. In an embodiment, a training period is established between a first transmitter-receiver device a... | 02/13/2007 |
| 7171003 | Robust and reliable acoustic echo and noise cancellation system for cabin communication A cabin communication system for improving clarity of a voice spoken within an interior cabin having ambient noise includes an adaptive speech enhancement filter for receiving an audio signal that includes a first component indicative of the spoken voice, a second c... | 01/30/2007 |
| 7171004 | Room acoustics echo meter for voice terminals The present invention provides an indication to the user of a voice communication system that an echo at the user's location has been detected by the system. In response to receiving this indication of echo, users may take any of several actions to reduce the echo, ... | 01/30/2007 |
| 7164712 | Reconfigurable FIR filter using CSD coefficient representation The present invention is directed to a reconfigurable finite impulse response (FIR) filter that processes data tap values with canonical sign digit (CSD) coefficients. The FIR filter according to the present invention includes a shift group associated with at least ... | 01/16/2007 |
| 7146003 | Noise level calculator for echo canceller A noise level calculator for detecting noise in a telephone line echo canceller that utilizes adaptive filters enables silencing of noise switching so that it is not heard on the far end side. The calculator promotes determining whether the reference signal applied ... | 12/05/2006 |
| 7142595 | System and method for decreasing cross-talk effects in time-domain-modulation (TDM) digital subscriber line (DSL) systems A communications system may be characterized by a system error variance because the error variance provides an indication of signal corruption in the system. By strategically adding a secondary sensor to the communications system, system characteristics may be alter... | 11/28/2006 |
| 7139310 | Method for transmitting data streams, and warm start sequence for S(H)DSL transmission/reception devices The invention relates to a method for transmitting data streams where transmission/reception devices (LTU, NTU) deactivated to a standby state are activated by performing a warm start sequence, with transmission line parameters being determined (S103) using a... | 11/21/2006 |
| 7136471 | Method and apparatus for detecting a secondary destination of a telephone call based on changes in the telephone signal path A method and apparatus for detecting whether a remote party has added a secondary telephone destination to a telephone call, for example through the activation of three-way calling service, conference calling or two lining bridging, by identifying an echo characteri... | 11/14/2006 |
| 7130281 | Devices, softwares and methods with improved performance of acoustic echo canceler in VoIP communication Devices, softwares and methods send a warning signal when a periodic signal is present in the audio content of a VoIP connection. In response to the warning signal, an acoustic echo canceller of an IP telephone discontinues its adapting process. A signaling network ... | 10/31/2006 |
| 7110554 | Sub-band adaptive signal processing in an oversampled filterbank An adaptive signal processing system for improving a quality of a signal. The system includes an analysis filterbank for transforming a primary information signal in time domain into oversampled sub-band primary signals in frequency domain and an analysis filterbank... | 09/19/2006 |
| 7106815 | Ingress noise reduction in a digital receiver The invention provides a device (D2) for reducing ingress noise in a digital signal, comprising a noise predictor (20) for predicting an amount of ingress noise in the digital signal (sn) based on past samples of the ingress noise, and a sub... | 09/12/2006 |
| 7095720 | Trunk level echo canceller test system Integrated echo cancellers in a telecommunications system are tested using a test apparatus connected to the main communications trunk where a large number of individual signals are multiplexed together. The signals are de-multiplexed in the test apparatus and speci... | 08/22/2006 |
| 7085370 | Ringback detection circuit A ringback detector determines whether ringback by comparing measurements of a characteristic of the received signal, such as the energy of the received signal, to a threshold. The threshold is set initially to a low value and then updated based on the measurements ... | 08/01/2006 |
| 7076513 | Method and architecture for controlling asymmetry of an LMS adaptation algorithm that controls FIR filter coefficients A circuit (48) and method, which can be used in a mass data storage device, controls adaptation asymmetry of coefficients of an FIR filter (20) using an accumulator (52) or accumulating correlation results between unequalized FIR filter input da... | 07/11/2006 |
| 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 |
| 7069286 | Solution space principle component-based adaptive filter and method of operation thereof The present invention provides an adaptive filter. In one embodiment, the adaptive filter includes a solution vector generator that develops a sparse expression of an initial solution vector. In addition, the adaptive filter includes a proportionate normalized least... | 06/27/2006 |
| 7068780 | Hybrid echo canceller Systems and methods for reducing transmit echo in a transceiver are disclosed. A hybrid echo canceller includes a limited tap length FIR filter to cancel short-term echo, while an interpolated filter is used to cancel the long-tail echo. The limited tap length FIR f... | 06/27/2006 |
| 7065206 | Method and apparatus for adaptive echo and noise control A method and apparatus for adaptive echo and noise control. A signal can be received at an input to a communication or electronic device. Background noise in the signal can be determined. The order of noise suppression and echo cancellation can be adaptively determi... | 06/20/2006 |
| 7050575 | Echo canceler coefficient update apparatus and method An echo canceler and method for a communications system include an echo-containing signal input for receiving a signal and an echo-causing signal source for developing an echo-causing signal. A first filter coupled to the echo-containing signal input and the echo-ca... | 05/23/2006 |
| 7042969 | Method and apparatus for frame alignment in discrete multitone transceivers A method and apparatus for determining frame alignment in a discrete multitone transceiver by determining a rotation of the coefficients of the shortening channel impulse response for which inter symbol interference (ISI) is minimal. The ISI is determined by multipl... | 05/09/2006 |
| 7039567 | System identification method Quick real-time identification and estimation of a time-non-varying or time-varying system. A new H∞ evaluation criterion is determined, a fast algorithm for a modified H∞ filter based on the criterion is developed, and a quick time-varying... | 05/02/2006 |
