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Patent Searching and Data


Matches 551 - 600 out of 14,267

Document Document Title
WO/2005/064908A1
The present invention relates to an audio communication system and method with improved acoustic characteristics. The present invention utilizes the Haas effect to simulate a sound picture that gives a better subjective impression of ste...  
WO/2005/062595A1
The present invention relates to an audio communication system and method with improved acoustic characteristics. A stereo detector is introduced in the echo cancellator of the system. When stereo in far-end audio is detected, converging...  
WO/2005/060583A2
A double talk activity detector (30) and method for an echo canceler circuit (10) improves the probability of detecting a double talk condition based on at least pre-echo canceler uplink data (40). The echo canceler circuit (10) includes...  
WO/2005/060582A2
A downlink activity and double talk probability detector and method for an echo canceler circuit (10) improves the stability of an echo canceler adaptive filter (300) and improves the attenuation of post-echo canceler uplink data (388). ...  
WO2005002183B1
This invention describes a statistical adaptive-filter controller for digital acoustic echo control in hands-free telephones for achieving more consistent echo cancellation results (i.e. higher output signal quality) and simpler realizat...  
WO/2005/053278A2
An interface device inserted in the telephone line between a data device and a fixed wireless terminal recognizes when the attached data device goes off-hook in order to send a string-command message and signal the fixed wireless termina...  
WO/2005/053277A2
An method (500) and apparatus (100) for adaptive echo and noise control. A signal can be received at an input (140) to a communication or electronic device. Background noise in the signal can be determined. The order of noise suppression...  
WO/2005/050622A1
A method and apparatus for reducing echo in a communication system are provided. A first signal including a voice component associated to a speaker is received. The first signal is processed to derive a harmonic feature of the voice comp...  
WO/2005/048572A2
Embodiments of the invention provide a small and economical two-way communications device that has both an excellent echo-cancellation function that substantially suppresses echoes over the entire frequency range and an excellent voice-o...  
WO/2005/048578A1
A telephone call processing arrangement establishes a path between a called switching center and an audio content server in response to receipt of an incoming call to a subscriber. A preselected audio presentation is transmitted from the...  
WO/2005/046194A1
Disclosed is a device for processing an input signal comprising a number of sub-signals which are allocated to discrete transmitting and receiving units that are disposed in predetermined geometrical positions relative to a space. The in...  
WO/2005/046076A1
A transmission signal u (t) after echo cancellation by an echo canceller (1) is band-divided and a ratio of an echo component for a signal component of each band is estimated by ratio estimation means. An echo suppression amount eg (n) i...  
WO2005002184A3
This invention discloses an improvement to a digital Acoustic Echo Control (AEC) in hands-free telephones. It describes an additional adaptive filter referred to as a residual echo filter, which is placed after the usual echo canceller a...  
WO/2005/041543A1
A headset (16) for communication with a device (10, 20) configured for processing audio signals captured by the headset (16) to detect user speech and transmitting, to the device (10, 20), sampled representations of the captured audio si...  
WO2004066107A3
Stacking of Digital Subscriber Line Access Multiplexers (DSLAMs) is accomplished in multiple communications schemes using a master DSLAM (12) having a control circuit (24) and an uplink communication circuit (26) to a central office and ...  
WO2005002183A3
This invention describes a statistical adaptive-filter controller for digital acoustic echo control in hands-free telephones for achieving more consistent echo cancellation results (i.e. higher output signal quality) and simpler realizat...  
WO/2005/039234A2
A protective cover assembly (14) including a metal foil (20) with perforations (21), and a treatment on one or more surfaces of said metal foil. The treatment is a hydrophobic or oleophobic treatment, or both. The protective cover assemb...  
WO/2005/036922A1
In accordance with the teachings described herein, a communication headset with signal processing capabilities is provided. A radio communications circuitry may be included to communicate wirelessly with a communications device. A speake...  
WO2004045244A8
Abstract ADAPTIVE NOISE CANCELING MICROPHONE SYSTEM An adaptive noise canceling microphone system for extracting a desired signal, in particular a desired speech signal, comprising two microphones being arranged at a predefined distance ...  
WO2004093328A3
A bidirectional amplifier circuit (100) includes first (102) and second (104) input ports, first (106) and second (108) output ports, a power amplifier (110), and first (112), second (114), third (116), and fourth (118) filter circuits. ...  
WO/2005/034577A1
The present invention relates to a method and apparatus for improving interference suppression processing and control in hearing aids (310) communicating with a mobile station (350) over a short-range wireless network. The hearing aid (3...  
WO/2005/031707A1
Method for encoding an acoustic signal (y(n)) containing a speech component (s(n)) and an echo component (e(n) by using an analysis through synthesis method, wherein for encoding the acoustic signal is compared with a synthesised signal ...  
WO/2005/031706A1
Method for transmitting speech parameters representing an acoustic signal being encoded by an analysis through synthesis method wherein at least a part of the speech parameters are selected from fixed gains for describing the acoustic si...  
WO2005011234A3
An echo canceler includes an recursive least squares lattice to whiten a far-end signal s1(t) and provide whitened time delays. The echo canceler further decorrelates a microphone signal based on the whitened time delays to reduce echoes...  
WO2003092255A8
The invention relates to a virtual audio bandwidth extender, and more particularly a device for increasing the perceived bandwidth of audio signals in equipment having limited bandwidth, especially in mobile telephones. The invention als...  
WO/2005/022876A1
Device and method for measuring a talking quality of a communication link in a communications network (10). The device comprises measurement means (22; 31, 36) connected to the communication link, which are arranged to subject a degraded...  
WO2004107588A3
A method and apparatus for transmitting and receiving RF signals for broadband communications using power lines as communication medium. A super-heterodyne structure is used to translate the signals from one frequency to another so as to...  
WO/2005/011248A1
The invention relates to a system for the digital processing of an acoustic signal, arranged in a telephone set provided with a loudspeaker (28) and a microphone (27), between said loudspeaker and said microphone. The aforementioned syst...  
WO/2005/011234A2
An echo canceler includes an recursive least squares lattice to whiten a far-end signal s1(t) and provide whitened time delays. The echo canceler further decorrelates a microphone signal based on the whitened time delays to reduce echoes...  
WO/2005/011274A1
A doorphone system comprising a slave unit (10) installed as a user interface for a visitor (VS), and a master unit (20) installed as a user interface for a resident (RS) and communicating with the slave unit (10) by transmitting/receivi...  
WO/2005/011139A1
In order to reduce noise in telecommunications made over unshielded twisted pair (UTP) of metallic conductors an active electronic circuit for a two-to-four wire hybrid circuit reduces common mode signals without recourse to inductive co...  
WO/2005/008916A1
Disclosed is a wireless repeater including an echo canceller unit capable of efficiently canceling a n echo signal that a n emitted signal by a transmission antenna is re-inputted to a receiving antenna and an echo cancellation method. A...  
WO/2005/008910A1
[PROBLEMS] A speech communication apparatus not only for preventing echo suppression capability from degrading even when the positional relationship between a speaker and a microphone is changed but also for allowing a high quality speec...  
WO2004055996A3
A fault associated with a communication medium (134) is analyzed by correlating a first set of information indicative of echo associated with the communication medium (134) with a second set of information indicative of echo. The fault i...  
WO/2005/002184A2
This invention discloses an improvement to a digital Acoustic Echo Control (AEC) in hands-free telephones. It describes an additional adaptive filter referred to as a residual echo filter, which is placed after the usual echo canceller a...  
WO2004100602A3
The invention is directed to a method comprising receiving input signals emanating from at least two microphone arrays each comprising at least two microphones, processing the input signals of each microphone array by a beamformer to det...  
WO/2005/002183A2
This invention describes a statistical adaptive-filter controller for digital acoustic echo control in hands-free telephones for achieving more consistent echo cancellation results (i.e. higher output signal quality) and simpler realizat...  
WO2004004297A8  
WO2004086555A3  
WO/2004/112370A1
The invention relates to a method and device for processing echo between at least two communications devices in order to attenuate, in a signal received by a communications device comprising at least one microphone, the components of a s...  
WO/2004/110031A2
Managing line power for network elements in an access network. In one embodiment a current sense system in a line power network is disclosed. The current sense system includes a power supply, a splitter and a sense circuit. The power sup...  
WO2004098088A3
A method and apparatus for reducing crosstalk in a multi-channel communication system is disclosed. In one embodiment, outgoing signals (302) in a multi-channel environment are manipulated into a transform domain (416), such as the frequ...  
WO/2004/109439A2
A method of managing power at an element management system for power sourcing and power sinking network elements of an access network. The method includes identifying a set of primitives for managing power usage at the power sinking netw...  
WO/2004/107724A2
A two way sound reproduction system, such as a mobile phone system has an input (2) for an incoming far end signal (W), a loudspeaker (5), a D-to-A-converter (3) between the input (2) and the loudspeaker (5), a microphone (7), a A-to-D (...  
WO/2004/107588A2
A method and apparatus for transmitting and receiving RF signals for broadband communications using power lines as communication medium. A super-heterodyne structure is used to translate the signals from one frequency to another so as to...  
WO/2004/105357A2
A telephone includes a transmit channel and a receive channel, each including a bank of sub-band filters having a VAD coupled one to each sub-band filter. Each VAD measures the spectral energy in a sub-band, compares the spectral energy ...  
WO/2004/105370A1
An interphone has an interphone operation unit (102), an interphone transmitter/receiver (50), and a communication control unit (101) for connecting the interphone operation unit (102) to a telephone circuit. The interphone operation uni...  
WO/2004/105371A1
A microphone circuit includes a first microphone, a second microphone, an adjustable delay unit, and a combiner. The first microphone generates a first microphone signal that includes a contribution associated with an output signal that ...  
WO/2004/100602A2
The invention is directed to a method comprising receiving input signals emanating from at least two microphone arrays each comprising at least two microphones, processing the input signals of each microphone array by a beamformer to det...  
WO/2004/098088A2
A method and apparatus for reducing crosstalk in a multi-channel communication system is disclosed. In one embodiment, outgoing signals (302) in a multi-channel environment are manipulated into a transform domain (416), such as the frequ...  

Matches 551 - 600 out of 14,267