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| Number | Title | Issue Date |
| 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 |
| 7003093 | Tone detection for integrated telecommunications processing Disclosed is an integrated tone detection processor for discriminating between tone and voice signals and determining the tones. The tone detection processor performs Automatic Gain Control (AGC) to normalize the power of the tone or voice signal. Further, the energ... | 02/21/2006 |
| 6980641 | Method and apparatus for controlling a computer to implement telephone functions with an enhanced minidialer function An enhanced telephone emulation computer system including a minidialer program for controlling a computer to add telephony functions which can be invoked from whatever active program is currently controlling the computer. The minidialer program controls the computer... | 12/27/2005 |
| 6980644 | System and method for adapting an analog echo canceller in a 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... | 12/27/2005 |
| 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 |
| 6954535 | Method and adapting a hearing aid, and hearing aid with a directional microphone arrangement for implementing the method In a method for adapting a hearing aid, and a hearing aid arrangement for improving the directivity of a hearing aid with a number of microphones that are connected to one another for generating a directional characteristic, the hearing aid is exposed to acoustic wa... | 10/11/2005 |
| 6944304 | Method and apparatus for reducing impulse noise in a signal processing system An observed signal that is corrupted with impulse noise is recorded in a signal processing system of an image processing system or a digital subscriber line (xDSL). The observed signal that is recorded by the signal processing system includes a noise component and d... | 09/13/2005 |
| 6940968 | Telephone terminal apparatus and method A telephone apparatus comprises a first audio input device, a second audio input device, a first audio output device, and a second audio output device. The telephone apparatus is operative to couple the first audio input device and the first audio output device to a... | 09/06/2005 |
| 6940986 | Apparatus and method for remotely and automatically controlling the volume of audio signals produced by a remotely controlled audio device An apparatus and method for remotely and automatically adjusting the volume of a remotely controlled audio device. In one embodiment, the apparatus comprises a sensor circuit for continuously detecting audio signals generated by the audio device, a difference circui... | 09/06/2005 |
| 6934396 | Speaker embedded with oral setup tutorial Oral instructions for setting up a system of speakers are provided in a setup speaker. The setup speaker audibly plays the instructions and is powered by a battery or external power source. Oral indications of successful connections and completion of the setup are p... | 08/23/2005 |
| 6928161 | Echo cancellation apparatus, systems, and methods An echo cancellation unit includes a model store to store a current echo model from an adaptive filter when a real-time error occurs. The real-time error is detected by monitoring a convergence metric. In some embodiments, the convergence metric is echo return loss ... | 08/09/2005 |
| 6928171 | Circuit and method for the adaptive suppression of noise The circuit for adaptive suppression of noise is a component part of a digital-hearing aid, consists of two microphones (1, 2), two AD—converters (3, 4), two compensating filters (5, 6), two retarding elements (7, 8), two subtractors ( | 08/09/2005 |
| 6925168 | Telecommunications network In a telecommunications network short dialling codes for a subscriber terminal are programmed by another party, and the allocation of codes is communicated to the user. An audio announcement played as part of the dial tone may be used to communication the allocation... | 08/02/2005 |
| 6920219 | Method and apparatus for providing echo cancellation A method for providing echo cancellation between a first and second communication unit detects an echo condition (200) between first and second communication units. In addition, the method includes detecting whether a decoded near end audio packet contains a ... | 07/19/2005 |
| 6920218 | Combination clock and charge pump for line powered DAA Disclosed is a method and apparatus which facilitates the use of existing power that is ordinarily unused or discarded to provide power to a telephone interface circuit when the circuit is in the on-hook state, thereby alleviating the need to use loop current to pow... | 07/19/2005 |
| 6917688 | Adaptive noise cancelling 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 from each other; a signal forming system (SFS) being adapted to receive a first a... | 07/12/2005 |
| 6917680 | Apparatus for disabling a telephone ringer An apparatus for disabling a telephone ringer includes a light sensing device operable to produce a signal indicative of a level of ambient light; and a controller operable to receive the signal and disable the telephone ringer when the signal indicates that the amb... | 07/12/2005 |
| 6914979 | Tone detection A DFT is used to compute the magnitude and phase of the frequencies desired to be detected in a frame of sampled data by performing 2 dot products for each such frequency. The two dot products are calculated using the samples in the frame and an equal number of equa... | 07/05/2005 |
| 6912286 | Active noise cancellation system with integrated horn function An active noise cancellation system has a speaker which is utilized to generate sound to cancel engine noise, as is known. An operator horn switch communicates with a control for the active noise cancellation system. Upon receiving a request from the operator for a ... | 06/28/2005 |
| 6907129 | System and method for digital volume control A circuit and related method for digital volume control are provided, where the circuit includes a digital filter configured to process samples of an input stream in a manner that processes a previous input sample during a time interval before a subsequent input sam... | 06/14/2005 |
| 6901147 | Three-dimension active silencer A three-dimension active silencer includes a measuring unit for detecting a signal relating to a sound radiated from a target sound source which is located in a closed box. A plurality of additional sound sources are arranged around the target sound source. A microp... | 05/31/2005 |
| 6895089 | Pots splitter with line impedance matching Resistance in parallel with inductors in a series leg of the low-pass filter facilitates changing input and output resistance of the filter with little or no change in the reactance of the inductors. Furthermore, the reactance of the capacitors in the shunt legs of ... | 05/17/2005 |
| 6895096 | Microchannel plate audio amplifier A audio amplifier employs microchannel plate for multiplying input electrons to produce output electrons at a rate corresponding to an audio input signal. The MCP may have a segment input source, segmented input and output electrodes or a segmented anode for allowin... | 05/17/2005 |
| 6895086 | 3-Way call detection system and method Disclosed herein is a three-way call detection system and method for detecting the addition of a third party to a pre-existing telephonic connection between a first party and a second party. The system comprises a meter for measuring the amplitude of a line voltage ... | 05/17/2005 |
| 6891955 | Audio volume control for computer systems A computer system includes an audio chip to generate audio signals at a target volume level to be emitted as audio output by speakers. Also included in the computer system may be a volume control routine to limit the overall volume level of the system. A maximum vol... | 05/10/2005 |
| 6891947 | Multifunctional analog trunk circuit A multifunctional analog TRK circuit board is designed so as to serve as both loop, ground start, DID, E&M, ring down and both way TRK. Thus, the various analog TRK circuits are embodied in a single TRK board, thereby increasing productivity compared to the conventi... | 05/10/2005 |
| 6891954 | Vehicle-mounted noise control apparatus In an active noise control apparatus in which an audio signal and a noise control signal are mixed to thereby sound a loudspeaker inside a motor vehicle, a general-purpose audio head unit cannot conventionally be freely changed for the one already mounted on the mot... | 05/10/2005 |
| 6891948 | Echo canceller The present invention provides an echo canceller having a holding portion which holds at least a communication frame length's worth of reception signals; a power calculation portion which calculates power for each communication frame based on the reception signals h... | 05/10/2005 |
| 6888939 | Circuit for joint transmitting voice and data over a telephone line The invention relates to an SLIC circuit (1), which is connected directly to a telephone line (2), for joint transmission of voice and data via the telephone line (2), with adequate echo attenuation achieved even at high data frequencies in that... | 05/03/2005 |
| 6885899 | Method and apparatus for controlling a sound function of a computer system A method and an apparatus for controlling a sound function of a computer system based on whether or not a headphone plug is inserted into a monitor is disclosed. A switching section receives a sound signal from a main body of the computer system and outputs the soun... | 04/26/2005 |
| 6885746 | Crosstalk identification for spectrum management in broadband telecommunications systems Crosstalk between subscriber loops used to transmit different broadband services through the same bundled telephone cable is a significant limitation to providing digital subscriber line services. A method for estimating the crosstalk, identifying the sources of the... | 04/26/2005 |
| 6885750 | Asymmetric multichannel filter A multi-channel filter (20) includes S inputs for receiving S input signals (x1 . . . xS) and at least S filters (14, 28) coupled to the S inputs for filtering the input signals (x1 . . . xS) or auxiliary sig... | 04/26/2005 |
| 6882731 | Multi-channel audio converter A method and audio converter for generating further audio signals (u, ul, ur, uc, us) from initial audio signal (x, xl, xr), wherein optionally an information signal (in means 23) is derived fr... | 04/19/2005 |
| 6876741 | Device for detecting telephone line seizure The device for detecting telephone line seizure performs a measurement of voltage of the telephone line across a first and a second optocoupler connected in series to the telephone line and arranged head-to-tail. The first optocoupler makes it possible to discharge ... | 04/05/2005 |
| 6873705 | Combine audio and ringing mode A circuit where the same amplifiers and the same volume adjustment circuitry are used for the ringer mode as well as for the audio mode of a mobile phone is achieved. The volume adjustment in the audio and ringer mode is provided by a precise amplitude setting via t... | 03/29/2005 |
| 6873701 | System and method for DTMF detection using likelihood ratios A system and method for determining DTMF coefficients stores a plurality of reference templates, at least some of said reference templates representative of likelihood ratios. A plurality of LPC coefficients is received. The LPC coefficients are representative of an... | 03/29/2005 |
| 6870933 | Stereo audio processing device for deriving auxiliary audio signals, such as direction sensing and center signals An audio signal processing device is described for deriving auxiliary audio signals, such as audio direction sensing signals or a center audio signal from first and second audio signals through first and second filter paths, each of which comprises a first adaptive ... | 03/22/2005 |
| 6868158 | Echo processing apparatus An echo canceller has a high-pass filter 11, a speaker 3, an A/D converter 6, and an echo canceller 7. The high-pass filter 11 suppresses a low-frequency component in a received signal. The speaker 3 outputs an acoustic soun... | 03/15/2005 |
| 6868156 | Non-voice signal repeater for speech coders A method of repeating a non-voice signal such as a dual tone, multiple frequency (DTMF) signal, by inserting a delay sequence of data values into an output data sequence of data values, a portion of the output data sequence following the delay sequence being the sam... | 03/15/2005 |
| 6868157 | Echo canceling method, echo canceller and voice switch A digitized input signal is sampled, to obtain a reference input signal. The reference input signal is spuriously whitened, to obtain a pseudo whitened signal. An echo replica signal is generated on the basis of the pseudo whitened signal and an adaptive filter coef... | 03/15/2005 |
