Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 8170200 | Method and apparatus for percussive noise reduction in a conference A conferencing unit reduces or eliminates percussive noise in audio that it outputs to a far-end. The unit filters near-end audio into a plurality of bands and calculates instantaneous energies for each band. The energies in first and second ranges of the bands are ... | 05/01/2012 |
| 8155304 | Filter bank optimization for acoustic echo cancellation A communications device is presented for providing bi-directional audio communications between a near-end user and a far-end user via a bidirectional communications channel. The communications device includes an adaptive echo canceller receiving a near-end audio sig... | 04/10/2012 |
| 8144863 | Method and apparatus for echo cancellation A technique of echo cancellation in a communication system. A method and/or apparatus of echo cancellation that may be suitable for performing echo cancellation under single talk and double talk conditions. A method and/or apparatus of echo cancellation that may sig... | 03/27/2012 |
| 8045703 | Apparatus and method for echo-cancellation There is disclosed a multi-carrier transceiver system for use in echo cancellation. The transceiver system is arranged to generate from input data a multicarrier transmit signal comprising a plurality of multi-carrier data blocks. The transceiver system also has a m... | 10/25/2011 |
| 7856098 | Echo cancellation and control in discrete cosine transform domain There is provided an echo cancellation method that comprises computing a Discrete Cosine Transform (DCT) domain over a plurality of samples of a first signal to generate a plurality of first DCT samples, selecting one or more first coefficients from the plurality of... | 12/21/2010 |
| 7433463 | Echo cancellation and noise reduction method A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem.... | 10/07/2008 |
| 7349482 | Echo canceller of ADSL system and training method thereof An echo cancellation circuit includes delay units at its input unit and output unit in order to adjust the delay caused by a FIFO. The delay times of the delay units are trained using a training signal, such the REVERB signal, that is a system initializing signal. I... | 03/25/2008 |
| 7333579 | Robust symbol timing recovery circuit for telephone line modem A robust symbol timing recovery circuit for a telephone line modem is provided. The symbol timing recovery circuit comprises a timing estimator and an interpolator. The timing estimator, which performs an operation on input samples and estimates a timing offset of a... | 02/19/2008 |
| 7327840 | Loudspeaker telephone equalization method and equalizer for loudspeaker telephone An equalizer for a loudspeaker telephone includes a signal generator for generating a reference signal for broadcast by a loudspeaker of the loudspeaker telephone. A filter alters the frequency response of signals prior to broadcast by the loudspeaker. During set-up... | 02/05/2008 |
| 7277517 | Method for achieving symbol alignment to a pre-existing ADSL data exchange A method for determining symbol boundaries in an ADSL modem, comprising receiving multi-frequency modulated signals in the time domain, wherein the multi-frequency modulated signals include a pilot signal at a pilot frequency. Performing a time-to-frequency transfor... | 10/02/2007 |
| 7251322 | Systems and methods for echo cancellation with arbitrary playback sampling rates The present invention relates to systems and methods that remove echo from a signal via a novel echo cancellation technique that supports arbitrary playback sampling rates. The novel echo cancellation technique transforms a playback signal to a frequency domain repr... | 07/31/2007 |
| 7231036 | Anti-howling circuit detecting howling from effect of predicted echo signal In a system in which echo transferred from a received signal to an outgoing signal is canceled by subtracting an adaptively predicted echo signal from the outgoing signal, howling is detected by detecting the effect of the predicted echo signal. The detected effect ... | 06/12/2007 |
| 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 |
| 7155018 | System and method facilitating acoustic echo cancellation convergence detection A system and method facilitating acoustic echo cancellation convergence detection is provided. The invention includes an acoustic echo cancellation convergence detector having a center clipping component, a convergence calculator, a convergence filter and a converge... | 12/26/2006 |
| 7142533 | Echo canceller and compression operators cascaded in time division multiplex voice communication path of integrated access device for decreasing latency and processor overhead A cascaded signal processing arrangement processes digitally encoded voice samples transported over a time division multiplex (TDM) communication path for application to a processor-controlled digital communication device, in particular an integrated access device. ... | 11/28/2006 |
| 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 |
| 7103015 | DSL transmission system with means for ensuring local echo orthogonality A digital subscriber line transmission system comprising an IFFT circuit generating successive outgoing time domain symbols on a subscriber line from respective groups of digital frequency domain coefficients; an FFT circuit generating groups of digital frequency do... | 09/05/2006 |
| 7099349 | xDSL-based communication system Broadband communication systems and methods of the type utilizing xDSL packet-based technologies are configured to provide packet-based point-to-multipoint communication between an upstream xDSL modem and a plurality of downstream xDSL modems. The system preferably ... | 08/29/2006 |
| 7092832 | Adaptive compensation for measurement distortions in spectroscopy Methods of reducing the effects of measurement device artifacts on a measurement of a sample are presented. A number of reference measurements performed with the measurement device are observed to identify reference independent components of the reference measuremen... | 08/15/2006 |
| 7076002 | Method and apparatus for symbol boundary synchronization The apparatus for symbol boundary synchronization in one embodiment includes on the receive path of a multi-tone modem a window synchronizer, a converter and a symbol boundary component. The window synchronizer obtains windowed portions of the received datastream wh... | 07/11/2006 |
| 7042953 | Method and arrangement for compensating signal echoes during duplex data transmission with discrete multitone modulation A system and method for compensating for signal echoes during duplex data transmission with discrete multitone modulation includes determining, the error of a first reference channel. The error of the first reference channel is determined in the frequency domain and... | 05/09/2006 |
| 7027592 | Non-linear echo cancellation in discrete multi-tone systems A circuit arrangement for two-wire/four-wire conversion in a DMT system, which is connected to a digital reception path, a digital transmission path and also an analog transmission/reception path and which has nonlinear echo cancellation in the time domain of a sign... | 04/11/2006 |
| 7023812 | System and method for improving modem transmission through private branch exchanges, central offices, and other systems A modem including an echo canceller adapted to determine locations of far-end echo sources. The echo canceller is adapted to send a signal to turn off network echo suppressors and enter a training mode. A training signal at a predetermined modem training frequency i... | 04/04/2006 |
| 7003101 | Subband echo location and double-talk detection in communication systems A method of controlling an echo canceller in a communications channel, is disclosed wherein input signals from the communications channel are first subbanded into a subband. Echo locations are then identified within the subband and are used to control the echo cance... | 02/21/2006 |
| 6975585 | Slotted synchronous frequency division multiplexing for multi-drop networks In a modulation system an efficient modulation at a master station and allows great flexibility in clients, from simple 2 bit/symbol single-channel modulation and demodulation to multi-channel multiple-bit modulation. The present invention also permits selection of ... | 12/13/2005 |
| 6968064 | Adaptive thresholds in acoustic echo canceller for use during double talk Disclosed is an apparatus for cancelling far endpoint echo signals in audio signals transmitted from a near endpoint to a far endpoint. In one embodiment, the apparatus includes a near endpoint analysis filter bank operable to divide a near endpoint signal into a pl... | 11/22/2005 |
| 6959167 | Noise-level adaptive residual echo suppressor An improved echo control system has an adaptive controlled echo canceling filter arrangement in which a background filter updates the filter coefficients of an echo shaping filter responsive to a normalized least mean square (NLMS) algorithm. An adaptive control mod... | 10/25/2005 |
| 6952472 | Dynamically estimating echo return loss in a communication link A method of estimating an echo return loss of a communication link measures the peak power value of a signal received from a far end of a communication link and the corresponding peak power value of a signal received from the near end of the communication link. When... | 10/04/2005 |
| 6944289 | Delay insertion for echo cancellation, with echo supression, in a communication network The invention provides an apparatus and method for bulk delay insertion prior to echo cancellation, with echo suppression. The exemplary apparatus embodiment (100) bandpass filters (120) and down samples (130), by a down sampling factor, a refer... | 09/13/2005 |
| 6943827 | Apparatus for monitoring quality of picture in transmission A first characteristic value extracting unit extracts a characteristic value from a picture transmitted from a transmission side, and a second characteristic value extracting unit extracts a characteristic value from a picture received on a reception side. These ext... | 09/13/2005 |
| 6931084 | Differential coding and carrier recovery for multicarrier systems A method of performing an echo phase offset correction in a multi-carrier demodulation system involves the step of differential phase decoding phase shifts based on a phase difference between simultaneous carriers having different frequencies. An echo phase offset i... | 08/16/2005 |
| 6895095 | Method of eliminating interference in a microphone A method of eliminating interference components in a microphone signal by generating a compensation signal and subtracting the compensation signal from the microphone signal. The compensation occurs completely in the frequency domain and the output signal is process... | 05/17/2005 |
| 6859531 | Residual echo estimation for echo cancellation Real and imaginary components of the discrete Fourier transform (DFT) of the residual echo in an acoustic echo cancellation system are separately estimated using mapping functions derived without an assumption of statistical independence between separate components ... | 02/22/2005 |
| 6834108 | Method for improving acoustic noise attenuation in hand-free devices The present invention relates to a method for improving acoustic noise attenuation, in which the method includes an adaptive control for partial-band echo compensation as well as global-band post-filtering for suppressing residual echo in hand-free devices. This met... | 12/21/2004 |
| 6804348 | Circuit for echo-cancellation in an asymmetric, two-way time-and frequency-shared communication medium A hybrid circuit models a plurality of attributes of a communication system including a subscriber line coupled to a line interface circuit. The plurality of attributes includes subscriber line impedance, and impedance of a coupling transformer. The attributes are b... | 10/12/2004 |
| 6798828 | Full duplex gigabit-rate transceiver front-end and method operation A method for equalizing a signal in a transceiver includes receiving an analog signal and adaptively equalizing the analog signal in an adaptive equalization filter to produce an analog filtered signal. The method also includes converting the analog filtered signal ... | 09/28/2004 |
| 6798827 | System and method for correcting offsets in an analog receiver front end A method corrects an input DC offset signal generated in front-end analog signal processing circuitry in a transceiver capable of operating in a high frequency local area network. An output signal from the front-end analog signal processing circuitry of the transcei... | 09/28/2004 |
| 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 |
| 6760435 | Method and apparatus for network speech enhancement An apparatus for enhancing intelligibility of a voice signal in a noisy environment includes a first noise estimator which estimates a far-end noise component from the far-end signal, and a second noise estimator which estimates a near-end noise component from the n... | 07/06/2004 |
| 6757385 | Symmetry based subband acoustic echo cancellation Processing complexity in an acoustic echo canceller can be reduced by partitioning the input near-end and far-end signals into respective pluralities of frequency subband signals. Also, due to the complex conjugate symmetry of conventional Discrete Fourier Transform... | 06/29/2004 |
