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"Telephone, n. An invention of the devil which abrogates some of the advantages of making a disagreeable person keep his distance. "
Ambose Bierce
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| Number | Title | Issue Date |
| 8189766 | System and method for blind subband acoustic echo cancellation postfiltering Systems and methods for blind subband acoustic echo cancellation postfiltering in a communication device are provided. In exemplary embodiments, an acoustic signal is received via a microphone of the communication device. Acoustic echo cancellation (AEC) is applied ... | 05/29/2012 |
| 8160240 | Echo cancellation balance using noise generator and average power detection A communication system includes transmit and receive paths, a balancing filter, a noise generator, a detector, and an interface. The transmit path is operable to generate data for communication on a communication network. The receive path is operable to receive data... | 04/17/2012 |
| 8031863 | Apparatus and method for controlling acoustic echo cancellation in mobile communication terminal An apparatus and method for controlling acoustic echo cancellation in a mobile communication terminal are capable of improving phenomena occurring during a call, such as an echo phenomenon, muting phenomenon and fluctuation of transmitting signals, by performing rea... | 10/04/2011 |
| 7894598 | System for limiting receive audio A system for limiting a received audio signal in a communication system is provided. The receive audio signal is limited prior to being played over a loudspeaker to insure that the loudspeaker output will not be clipped when picked up by a nearby microphone associat... | 02/22/2011 |
| 7734036 | Dynamic attenuation method and apparatus for optimizing voice quality using echo cancellers A method and corresponding apparatus for managing voice quality by optimizing the amount of attenuation placed in the echo return path based on the conditions observed during each telephone call. At the beginning of a telephone call, a pre-configured initial amount ... | 06/08/2010 |
| 7636435 | Device and method for processing audio signals and telecommunication set equipped with such a processing device This device for processing audio signals for telecommunication equipment comprises automatic gain control means (18) acting on the level of the received audio signal (Sr) by amplifying and attenuating the signal as a function of the level of the received sign... | 12/22/2009 |
| 7319748 | Device and method for suppressing echo in telephones The present invention relates to a suppression device for an arrangement for the transmission of audio signals, in particular uttered speech, having: an echo reduction unit (4), which is arranged between an input channel (1) for receiving an input audi... | 01/15/2008 |
| 7305083 | Echo canceller An echo canceller used in a vocal information exchange system operates in such a circumstance that a sound wave released by a speaker is picked up by a microphone unintentionally and works to suppress an echo signal included in the audio signal produced by the micro... | 12/04/2007 |
| 7280737 | Method and apparatus for discouraging commercial skipping A program includes sequential program segments, commercial segments, segment dividers delimiting the program and commercial segments and extraneous signals inserted into the segments. The extraneous signals are selected to mimic segment dividers and thus discourage ... | 10/09/2007 |
| 7260213 | Telephone echo canceller The invention relates to an echo canceling device and method for an arrangement for transmitting audio signals, in particular uttered speech with an echo filter for canceling echo. The echo filter is arranged between an input channel (1) and an output channel... | 08/21/2007 |
| 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 |
| 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 |
| 7212628 | Echo cancellation/suppression and double-talk detection in communication paths A method of suppressing an echo signal in a communication path such as acoustic coupling between a speaker and a microphone in a telephone device handset includes the steps of monitoring a transmitted signal supplied to the communication path to determine an attribu... | 05/01/2007 |
| 7206561 | Radio equipment A radio equipment, wherein an attenuator (10) is inserted between antennas (91, 92) and a radio module (2), and output and input sensitivities are raised and lowered simultaneously so as to keep the balance of a radio covering range with an inpu... | 04/17/2007 |
| 7203308 | Echo canceller ensuring further reduction in residual echo An echo canceller includes: an echo cancellation part canceling echo included in a near-end input signal; a noise suppression part employing a low-pass filter having a variable cut-off frequency adaptive to power of an input signal, the noise suppression part removi... | 04/10/2007 |
| 7154867 | Echo reduction This invention provides a technique to reduce echoes not adequately attenuated by echo cancellers during initial periods of voice communication. Signals transmitted across communication networks are often reflected back to the caller resulting in echo. Echo cancelle... | 12/26/2006 |
| 7139342 | System and method for cancelling signal echoes in a full-duplex transceiver front end There is disclosed an echo canceller circuit for use in a full duplex transceiver of the type comprising a line driver capable of sending analog transmit signals through a cable and comprising a line receiver capable of receiving analog receive signals from the cabl... | 11/21/2006 |
| 7130413 | 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... | 10/31/2006 |
| 7103177 | Reduced complexity transform-domain adaptive filter using selective partial updates A transform-domain adaptive filter uses selective partial updating of adaptive filter parameters. This updating may be based on a constrained minimization problem. The adaptive filter parameters are separated into subsets, and a subset is selected to be updated at e... | 09/05/2006 |
| 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 |
| 7085715 | Method and apparatus of controlling noise level calculations in a conferencing system Apparatus for controlling noise characteristic estimation in a conferencing system, comprising a noise characteristic estimator for estimating a noise characteristic of a signal of interest transmitted in a first direction through the conferencing system, and a firs... | 08/01/2006 |
| 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 |
| 7062434 | Compressed domain voice activity detector The system and method of the present invention comprises a compressed domain voice activity detector that detects the presence or absence of voice activity in a digital input signal. The method includes converting a digital input signal into parametric data. The par... | 06/13/2006 |
| 7050576 | Double talk, NLP and comfort noise A state machine for attenuating the transition into and out of NLP state to reduce voice clipping and to reduce echo leak in a voice over packet signal transmission. The state machine interposes two additional transitional states between the NLP active state and the... | 05/23/2006 |
| 7046792 | Transmit/receive arbitrator The amplitudes of a signal on the microphone input of a telephone and a signal on the line input of the telephone are compared with each other and with two thresholds. The comparisons are sampled and the samples control an up-down counter. The count in the counter i... | 05/16/2006 |
| 7039181 | Consolidated voice activity detection and noise estimation Methods and apparatus compensating for background noise associated with a transmitted signal. In a first embodiment, an adder combines an echo estimate with the the transmitted signal to form a processed signal, a noise reduction circuit uses a background noise esti... | 05/02/2006 |
| 7027591 | Integrated noise cancellation and residual echo suppression A combined processor, such as might be used in a mobile handset or hands-free communication device, provides residual echo suppression and noise reduction while eliminating the need for explicit comfort noise generation. Operating within a near-end communication dev... | 04/11/2006 |
| 7020099 | Apparatus for, and method of, reducing noise in a communications system A communication line having a plurality of twisted wire pairs connects a plurality of transmitters, one transmitter at each end of each twisted wire pair, with a plurality of receivers, one receiver at each end of each twisted wire pair. Each receiver receives a com... | 03/28/2006 |
| 7003095 | Acoustic echo canceler and handsfree telephone set The present invention provides an acoustic echo canceler for use in a telephone set having a handsfree conversation function. This acoustic echo canceler simultaneously achieves both the stabilization and speedup of an estimation operation and also attains the more ... | 02/21/2006 |
| 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 |
| 6975722 | Dual echo canceller with fast reflector identification An echo canceller, which includes, receives and sends paths connected to standard telecommunication interfaces, a non adaptive filter with filter reflection coefficients which generate an estimated echo signal, which when subtracted from the send path input produces... | 12/13/2005 |
| 6963642 | Band-by-band full duplex communication A telephone includes a first channel having a microphone input and a line output, a second channel having a line input and a speaker output, and each channel having a plurality of band pass filters with their outputs coupled to a multiplex circuit. The multiplex cir... | 11/08/2005 |
| 6961422 | Gain control method for acoustic echo cancellation and suppression A gain control method for reducing or eliminating the undesirable effects of acoustic echo coupling between a speaker and a microphone while providing a full-duplex connection. Weighted normalized far-end and near-end powers are used to first calculate a suppression... | 11/01/2005 |
| 6947553 | Communication system for controlling training of echo canceller and line switching system A communication system being made up of a two-wire/four-wire hybrid circuit, an echo canceller, and a control device and having functions of forming a plurality of communication paths and changing communication paths is provided which is capable of ensuring high spe... | 09/20/2005 |
| 6947550 | Acoustic echo cancellation The invention is an echo canceller for reducing the magnitude of an echo occurring in a return channel of a communication device and a method of implementing the same. The echo canceller includes a processing unit for generating an echo attenuated signal. The proces... | 09/20/2005 |
| 6940829 | Method and processor in a telecommunication system In a method of running a processor for high performance operation in a communication network one function of the processor is a calculation using an algorithm. The function can include calculation for each of a plurality channels. In situations, when there is not av... | 09/06/2005 |
| 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 |
| 6922403 | Acoustic echo control system and double talk control method thereof An acoustic echo control system and a double talk control method thereof that eliminate echo signals which are generated in a hand-free communication system. In order to discriminate a double talk generation and a change of an echo path, the acoustic echo control sy... | 07/26/2005 |
| 6912209 | Voice gateway with echo cancellation A network gateway is configured to facilitate on line and off line bi-directional communication between a number of near end data and telephony devices with far end data termination devices via a hybrid fiber coaxial network and a cable modem termination system. The... | 06/28/2005 |
| 6909894 | Echo plug for a wireless telephone Echo plugs are plugged into the hands-free jacks of wireless telephones to facilitate testing. One echo plug has a pin and a circuit. The pin is physically compatible with the hands-free jack of a wireless telephone. The pin has a speaker connection and a microphone... | 06/21/2005 |
