Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 8090094 | Echo canceller An echo canceller is capable of reducing echo feeling in a conversation even if a tone signal is input. The echo canceller of this invention judges whether a far-end input signal is a calling control tone signal or not, and if that is the case, resets a coefficient ... | 01/03/2012 |
| 8085930 | Communication system A method for removing an echo component in a first signal received at an audio input device, said method comprising the steps of outputting a second signal from an audio output device, receiving at the audio input device the first signal wherein the echo component i... | 12/27/2011 |
| 8027462 | Structure and method for conversation like rendering for echo reduction without loss of information A method for conversation like rendering of a stored audio information stream determines a first location in the stored audio information stream. The first location represents a point in time when the sound detection flag became active. The method next moves from th... | 09/27/2011 |
| 8019075 | Hybrid echo canceller controllers Hybrid echo canceller controllers are described herein. By way of example, a system for controlling an echo canceller can include a cross-correlator, a discriminator and an echo canceller controller. The cross-correlator can be configured to produce a cross-correlat... | 09/13/2011 |
| 7995745 | Structure and method for echo reduction without loss of information An echo reduction method stores a received audio information stream. A sound detection flag is activated following detection of locally generated sound. Output based on the received audio information stream is muted in response to the activating the sound detection ... | 08/09/2011 |
| 7991146 | Anti-howling structure A howling control structure for a full duplex communication system. The structure is implemented as part of an acoustic echo canceller having a conventional transversal adaptive filter. A second transversal adaptive filter, shorter than the conventional filter, that... | 08/02/2011 |
| 7920697 | Interaction between echo canceller and packet voice processing System and method for processing communication signals in a communication system having a detector for detecting a parameter of a communication signal. A communication signal is provided to a non-linear processor (NLP) adapted to examine the signal and to decide whe... | 04/05/2011 |
| 7876892 | Multiple echo cancellation using a fixed filter delay There is provided a method for use by an echo canceller to cancel a far echo at a variable delay and a near echo at a fixed delay. The method comprises constructing an echo signal model based on an incoming signal, determining a variable echo delay for a far echo ca... | 01/25/2011 |
| 7853007 | Conference terminal with echo reduction for a voice conference system A conference terminal for a digital voice conference system comprises a first sound transducer means, which is implemented to generate a microphone signal from an acoustic signal, a second sound transducer means, which is implemented to generate an acoustic signal f... | 12/14/2010 |
| 7792281 | Delay estimation and audio signal identification using perceptually matched spectral evolution A signal identification method comprises receiving an incoming signal having incoming frames; receiving an outgoing signal having outgoing frames; extracting outgoing features from a current frame of the outgoing frames; extracting incoming features from a first pre... | 09/07/2010 |
| 7792280 | Narrow band tone detection in echo canceling system The present invention relates generally to tone detection in echo canceling systems, and more particularly to a method of monitoring oscillations of adaptive filter coefficients for narrow band tone detection in echo cancellation systems. The invention is directed a... | 09/07/2010 |
| 7787613 | Method and apparatus for double-talk detection in a hands-free communication system An echo canceling circuit comprising a double talk detector, an upper band signal filter configured to pass only near-end upper band signals to the double talk detector and remove lower band signals, an adaptive filter circuit, a control circuit operatively coupled ... | 08/31/2010 |
| 7539300 | Echo canceller with enhanced infinite and finite ERL detection There is provided a method of detecting an infinite echo return loss (ERL) in an echo cancellation system while in a finite ERL mode. The method comprises determining a running mean attenuation by the echo cancellation system, determining a ratio of an echo signal t... | 05/26/2009 |
| 7512227 | Echo canceller controller An apparatus and method for disabling an echo canceller in a communication channel is external to the echo canceller. The average power of the received signal is compared to the average power of the transmitted signal and if the received signal is more than 26 dB be... | 03/31/2009 |
| 7477735 | System and method for enhanced stereo audio An audio communication system and method with improved acoustic characteristics features a stereo detector that is introduced in the echo canceller of the system. When stereo in far-end audio is detected, converging of the adaptive mono model of the canceller is sus... | 01/13/2009 |
| 7424109 | Rapid training echo cancellor for telecommunications system Plural echo cancellors each are tuned for different hybrid delays until it is established which echo cancellors are operating to cancel echos. The echo cancellors not so operating are then terminated. ... | 09/09/2008 |
| 7394898 | Echo removing apparatus An echo removing apparatus for reducing the echo caused by sound returning from a speaker to a microphone of a small-sized communication terminal, such as a portable telephone. The echo removing apparatus includes a filter unit for outputting a pseudo echo signal es... | 07/01/2008 |
| 7318030 | Method and apparatus to perform voice activity detection A method and apparatus to perform voice detection are described. ... | 01/08/2008 |
| 7298838 | Adaptive cancellation network system and method for digital subscriber line A method for reducing transmit echo in a DSL modem comprises selecting at least one cancellation device of a plurality of cancellation devices. An attenuation signal is generated using the selected cancellation device. At least a portion of transmit echo is removed ... | 11/20/2007 |
| 7273207 | Bi-directional winch A winch includes a first cable reel and a second cable reel. A driveshaft rotates the first cable reel and the second cable reel. The driveshaft is moveable along an axis of rotation between a first position and a second position. The driveshaft operationally engage... | 09/25/2007 |
| 7257175 | Method and apparatus for periodic signal detection in OFDM/DMT systems A method for detecting a periodic signal in a communication system. The method includes converting a time domain digitized signal to obtain a corresponding frequency domain digitized signal, quantizing at least two symbols of the frequency domain digitized signal to... | 08/14/2007 |
| 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 |
| 7236929 | Echo suppression and speech detection techniques for telephony applications Various methods and apparatus are described for implementing effective echo suppression in a wide variety of telephony system architectures. These methods and apparatus include broadband and multi-band techniques for speech detection, estimation of near-end transmis... | 06/26/2007 |
| 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 |
| 7209554 | Ringing controller In a telecommunications system, a switching device selectively applies one of two different voltage supplies to a common node. A first of the voltage supplies is coupled to the common node by a first switch and a second of the voltage supplies is coupled to the comm... | 04/24/2007 |
| 7174291 | Noise suppression circuit for a wireless device An adaptive noise suppression system includes an input A/D converter, an analyzer, a filter, and a output D/A converter. The analyzer includes both feed-forward and feedback signal paths that allow it to compute a filtering coefficient, which is input to the filter.... | 02/06/2007 |
| 7159044 | Input/output device disable control for PC-based consumer electronics device An electronic system that includes control logic that causes input and output ports to be disabled during the interruption windows of the initialization process, and subsequently to be selectively disabled or enabled after completion of the initialization process. T... | 01/02/2007 |
| 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 |
| 7146315 | Multichannel voice detection in adverse environments A multichannel source activity detection system, e.g., a voice activity detection (VAD) system, and method that exploits spatial localization of a target audio source is provided. The method includes the steps of receiving a mixed sound signal by at least two microp... | 12/05/2006 |
| 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 |
| 7142881 | Communications system When communications between mobile terminals MS1 and MS2 are terminated, a TRAU1 judges whether the communications between mobile terminals MS1 and MS2 are synchronous and notifies the mobile terminal MS1 of this information... | 11/28/2006 |
| 7133425 | Communication system A method and apparatus is disclosed for facilitating high-speed data communication. In one embodiment a receiver is configured to include error correction coding in an interleaved environment to increase data transmission rates. In one embodiment the signal mapping ... | 11/07/2006 |
| 7133701 | Microphone position and speech level sensor Improper microphone position and speech level on a telephone headset is sensed by comparison of a speech envelope to multiple signal threshold levels. A first threshold is used to determine whether a headset user is talking. A second threshold is used to determine w... | 11/07/2006 |
| 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 |
| 7123714 | Speakerphone having improved outbound audio quality A telephone (310) and a method for providing outbound audio when the telephone is operating in a speakerphone mode. A first data unit (350) including a first unit type identifier (360) can be received by the telephone. The first unit type identi... | 10/17/2006 |
| 7120246 | Computer apparatus having a multiway acoustic output and input system A computer apparatus is provided, which has a multipath acoustic output system and a multipath acoustic input system, which includes parts for enabling an adaptation of the filter of an acoustic echo canceller incorporated in the computer apparatus that is always pr... | 10/10/2006 |
| 7120130 | Seamless redundant echo canceller replacement in a multi-channel echo canceller An echo cancelling system comprises a system controller for directing inbound and outbound PCM signals to one of two echo canceller modules. The system controller receives status information from the echo cancellers and maintains state information pertaining to the ... | 10/10/2006 |
| 7106856 | Method and apparatus for performing echo cancellation within a communication network A switching center for use in a communication network includes a pool of echo cancellation units for use in providing echo cancellation services to users associated with the switching center on an “as needed” basis. A communication connection being supported by ... | 09/12/2006 |
| 7106855 | Method and apparatus for connecting broadband voice and data signals to telephone systems A system for use in connecting broadband voice and data signals to communications systems such as the telephone system. Due to the low pass filtering characteristics of a standard twisted pair used in conventional telephone access loops data band signals are attenua... | 09/12/2006 |
| 7099329 | Method for preventing overload condition in a circuit switched arrangement An arrangement where connections between a terminal and a switch are effected through a serial connection of shared, overloadable, resources, and where conventionally each of the resources has a given number of communication channels, provides for effective congesti... | 08/29/2006 |
