Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 8416946 | System and process for regression-based residual acoustic echo suppression A regression-based residual echo suppression (RES) system and process for suppressing the portion of the microphone signal corresponding to a playback of a speaker audio signal that was not suppressed by an acoustic echo canceller (AEC). In general, a prescribed reg... | 04/09/2013 |
| 8401178 | Multiple microphone switching and configuration A mobile communications device contains at least two microphones. One microphone is designated by a selector to provide a voice dominant signal and another microphone is designated to provide a noise or echo dominant signal, for a call or a recording. The selector c... | 03/19/2013 |
| 8401177 | Combined sidetone and hybrid balance A combined sidetone and hybrid balance apparatus and method of operating same are disclosed. An embodiment of the present invention may provide both a hybrid balance mode of operation and a sidetone generation mode of operation within a single integrated circuit dev... | 03/19/2013 |
| 8363821 | Apparatus and method for canceling echo According to one embodiment, in response to a first acoustic signal output, a second acoustic signal is input. A filter unit is configured to generate a third acoustic signal by convoluting the first acoustic signal with coefficients. A subtraction unit is configure... | 01/29/2013 |
| 8290141 | Techniques for comfort noise generation in a communication system A technique of operating a communication device includes dividing a frequency band associated with a background noise signal into respective sub-bands. Respective individual level estimates for each of the respective sub-bands are then determined. A total level esti... | 10/16/2012 |
| 8184801 | Acoustic echo cancellation for time-varying microphone array beamsteering systems In a mobile terminal device having a processing unit and a memory unit, an acoustic echo cancellation and a microphone beamforming are provided. Said device includes a plurality of a microphones, a pre-processing stage has an amplifier and a signal converter for an ... | 05/22/2012 |
| 8160238 | Method and apparatus for double-talk detection The present invention discloses a double-talk detection method and apparatus. The method includes: obtaining a far-end signal frame and a near-end signal frame; and detecting a talk state according to a spectrum difference between the far-end signal frame and the ne... | 04/17/2012 |
| 8150027 | Control of echo cancellation filters Coefficients of an adaptive filter representative of an acoustic channel between an emitted acoustic signal and a microphone signal are determined and smoothed in time. An echo is then estimated by filtering the emitted acoustic signal with the smoothed coefficients... | 04/03/2012 |
| 8107616 | Acoustic echo canceller An acoustic echo cancellation device (1) for canceling an echo in a microphone signal (z) in response to a far-end signal (x) comprises: an adaptive filter unit (10) arranged for filtering the far-end signal (x) so as to produce an echo cancellation si... | 01/31/2012 |
| 8041027 | Electricity echo cancellation device and method An electricity echo cancellation device applied at a terminal includes: an input buffer memory module, a network echo delay computation module and an adaptive filtering module. The adaptive filtering module includes an adaptive filter, a subtracter and a dual-ended ... | 10/18/2011 |
| 7724892 | Method and apparatus for optimizing speakerphone performance based on tilt angle According to the present invention, a tilt sensor is used to determine the tilt angle of a speakerphone and the surface on which it rests. This information is used to optimize both the receive and transmit signals for the chosen tilt angle. The information can also ... | 05/25/2010 |
| 7649988 | Comfort noise generator using modified Doblinger noise estimate A background noise estimate based upon a modified Doblinger noise estimate is used for modulating the output of a pseudo-random phase spectrum generator to produce the comfort noise. The circuit for estimating noise includes a smoothing filter having a slower time c... | 01/19/2010 |
| 7555116 | Real time processing and management method for cancelling out the echo between a loudspeaker and a microphone of a computer terminal The invention relates to a real time processing and management method for canceling out the echo between a loudspeaker (HP) and a microphone (M) of a computer terminal. Said method consists of establishing the loudspeaker signal or the microphone signal as a referen... | 06/30/2009 |
| 7536006 | Method and system for near-end detection A system (200) and method (400) for near-end detection of voice (107) in speakerphone mode is provided. The method can include determining (402) a convergence of an adaptive filter (220), determining (404) a dissimilarity be... | 05/19/2009 |
| 7443978 | Method and apparatus for audio coding with noise suppression There is disclosed an audio coding apparatus which has a wideband encoder and noise canceller. The encoder includes a high-frequency audio coder and low-frequency audio coder. The low-frequency audio coder includes a low-frequency noise canceller. When the high-freq... | 10/28/2008 |
| 7428304 | Method and apparatus for detecting subscriber alerting signal tones and customer premises equipment alerting signal tones to non-echo canceling modems A non-echo canceling voice band modem capable of detecting subscriber alerting signal (SAS) tones and customer premises equipment alerting signal (CAS) tones is provided. The modem includes a shaping filter, an analog-to-digital converter (ADC), a SAS tone detector,... | 09/23/2008 |
| 7359979 | Packet prioritization and associated bandwidth and buffer management techniques for audio over IP The present invention is directed to voice communication devices in which an audio stream is divided into a sequence of individual packets, each of which is routed via pathways that can vary depending on the availability of network resources. All embodiments of the ... | 04/15/2008 |
| 7330738 | Apparatus and method for canceling residual echo in a mobile terminal of a mobile communication system An apparatus for canceling an echo signal in a mobile terminal of a mobile communication system. A double talk detector (DTD) receives a first signal by canceling an estimated echo signal from a signal received through a microphone, outputs the first signal, and out... | 02/12/2008 |
| 7272552 | Voice activity detection and silence suppression in a packet network The present invention is a system and method that improves upon voice activity detection by packetizing actual noise signals, typically background noise. In accordance with the present invention an access network receives an input voice signal (including noise) and ... | 09/18/2007 |
| 7236586 | Synchronization of echo cancellers in a voice processing system Methods and apparatus for processing a received voice signal from a variable-delay network by a communications system that has at least one echo canceller. An echo canceller determines delay characteristics that are associated with the received voice signal and corr... | 06/26/2007 |
| 7231350 | Speaker verification system using acoustic data and non-acoustic data A method and system for speech characterization. One embodiment includes a method for speaker verification which includes collecting data from a speaker, wherein the data comprises acoustic data and non-acoustic data. The data is used to generate a template that inc... | 06/12/2007 |
| 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 |
| 7161905 | Method and system for managing time-sensitive packetized data streams at a receiver According to one embodiment of the invention, a method for managing time-sensitive packetized data streams at a receiver includes receiving a time-sensitive packet of a data stream, analyzing an energy level of a payload signal of the packet, and determining whether... | 01/09/2007 |
| 7149305 | Combined sidetone and hybrid balance A combined sidetone and hybrid balance apparatus and method of operating same are disclosed. An embodiment of the present invention may provide both a hybrid balance mode of operation and a sidetone generation mode of operation within a single integrated circuit dev... | 12/12/2006 |
| 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 |
| 7139403 | Hearing aid with digital compression recapture Systems, devices, and methods are provided to inhibit apparent amplitude modulation in non-linear processing that causes distortion in a processed signal. One aspect of the invention includes a hearing aid. The hearing aid includes a microphone to receive an input s... | 11/21/2006 |
| 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 |
| 7103014 | Systems and methods for improving sound quality in computer-network telephony application A method of generating comfort noise in a communications includes selecting a packet of data from a stream of packets being received across a communications network, the packet comprising a selected number of data samples. Ones of the data samples from the selected ... | 09/05/2006 |
| 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 |
| 7058568 | Voice quality improvement for voip connections on low loss network The type of audio stored in the payload of a data packet transmitted over a data network is identified as speech audio or non-speech audio through the use of a non-speech identifier included in a header in the data packet. Upon detection of data packet containing no... | 06/06/2006 |
| 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 |
| 7050545 | Methods and apparatus for echo cancellation using an adaptive lattice based non-linear processor A non-linear processor for managing a speech signal is disclosed. The non-linear processor includes an adaptive lattice filter that generates a prediction error from a residual echo of the speech signal, a signum non-linearity unit that generates an excitation compo... | 05/23/2006 |
| 7043435 | System and method for optimizing prompts for speech-enabled applications A computer-implemented method is described for optimizing prompts for a speech-enabled application. The speech-enabled application is operable to receive communications from a number of users and communicate one or more prompts to each user to illicit a response fro... | 05/09/2006 |
| 7043014 | Apparatus and method for time-alignment of two signals A recently received portion of a transmit signal is utilized, and a pitch period of the received signal is determined. Then, the determined pitch period is utilized to search for similarities in the originally transmitted signal. This searching is done over a range ... | 05/09/2006 |
| 7039182 | Echo canceller having improved noise immunity Methods and systems pertaining to preventing the corruption of filter coefficients due to near end speech in an echo canceller that uses an adaptive filter to create a local replica of an echo signal are provided. In accordance with a preferred method, a far end sig... | 05/02/2006 |
| 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 |
| 7035397 | System and method for updating filter coefficients and echo canceller including same A system for updating filter coefficients for use with an echo canceller, a related method for updating filter coefficients and an echo canceller including the system or the method. In one embodiment, the echo canceller has a nonadaptive filter and an adaptive filte... | 04/25/2006 |
| 7031455 | Use of handset microphone to enhance speakerphone loudspeaker performance A speakerphone incorporates a portion defining a loudspeaker cavity, the cavity containing a loudspeaker. The speakerphone also includes a handset with an internal microphone in the handset. The speakerphone has a housing adapted to receive the handset, and when it ... | 04/18/2006 |
| 7027593 | Apparatus and method for echo control Determining the time delay between a transmitted signal and an echo. Then, the echo canceller is adjusted by the delay amount so that the echo canceller tail length is relatively short. ... | 04/11/2006 |
| 7016833 | Speaker verification system using acoustic data and non-acoustic data A method and system for speech characterization. One embodiment includes a method for speaker verification which includes collecting data from a speaker, wherein the data comprises acoustic data and non-acoustic data. The data is used to generate a template that inc... | 03/21/2006 |
