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| Number | Title | Issue Date |
| 7466756 | Receiver based saturation estimator A processor-implemented method of estimating the saturation level of a transmitter from a transmitted communication signal received from the transmitter comprises generating a received data signal from the transmitted communication signal received from the transmitt... | 12/16/2008 |
| 7376178 | Low bias estimation of small signal-to-noise ratio An apparatus and method for estimation of signal-to-noise ratio (SNR) with low bias that is effective for both positive SNRs and small to negative SNRs. The estimation is based on an iterative solution for the maximum likelihood estimate of the amplitude from which ... | 05/20/2008 |
| 7372692 | Electrical enclosure and interior assembly therefor An interior assembly for a load center includes a base member disposed at or about a panel member of the load center housing, a first bus bar assembly disposed on the base member, and a first insulating member overlaying the first bus bar assembly and being coupled ... | 05/13/2008 |
| 7359522 | Coding of stereo signals A method of encoding a multi-channel signal having first and second signal components includes determining a set of filter parameters a prediction filter such that the prediction filter provides an estimate of the second signal component when receiving the first sig... | 04/15/2008 |
| 7358781 | Automation device with stored profile The invention relates to an automation device, in which a multiplicity of physically distributed functional units communicate with each other by means of a common transmission protocol. The device has a microcontroller (110), which is assigned at least one cl... | 04/15/2008 |
| 7356083 | Data compression system and method This invention produces data packets that can vary in length and/or data compression ratio. First, an algorithm is employed to transform a data signal into fixed or variable length data packets at variable data compression ratios. If the algorithm produces fixed len... | 04/08/2008 |
| 7260525 | Filtering of control parameters in quality and rate control for digital audio An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and maximum bit count parameters. Second, an encoder regulates quantization usi... | 08/21/2007 |
| 7225135 | Signal-predictive audio transmission system Various methods and systems disclosed compand audio signals using signal prediction, followed by expansion and reconstruction. The methods and systems compress and expand an error signal that represents deviations between samples of the original signal and predicted... | 05/29/2007 |
| 7225136 | Data compression and expansion of an audio signal A data compression apparatus for data compressing an audio signal includes an input terminal (1) for receiving the audio signal, a 1-bit A/D converter (4) for A/D converting the audio signal so as to obtain a bitstream signal, a lossless coder (10 | 05/29/2007 |
| 7190295 | Accumulator for adaptive sigma-delta modulation A system and method for adaptive sigma-delta modulation. The system includes a input stage that produces a difference signal representing the difference between an analog input signal x(n) and a analog feedback signal z(n), the amplitude of the analog input signal x... | 03/13/2007 |
| 7164310 | Systems and apparatus for digital control of bias for transistors The present invention is directed toward a system and apparatus for digitally controlling a bias control signal for at least one transistor. The present invention provides for software writable registers that control the bias control signal. The present invention fu... | 01/16/2007 |
| 7129764 | System and method for local generation of a ratio clock A system for locally generating a ratio clock from a global clock based on a global clock gate signal includes a staging unit, a pass gate, and a state machine. The state machine is electrically connected to an output of the staging unit and an input of the pass gat... | 10/31/2006 |
| 7080089 | Customization of process logic in a software system The present invention facilitates customization of a process in a software system without modifying the process source code. The process can be customized by customizing a metadata description of the process, by handing the process agent a customized service identif... | 07/18/2006 |
| 7045802 | Method and apparatus for coincidence imaging digital triggering A method for operating a coincidence imaging system is provided. The method includes receiving samples from a detector output and determining an intersection of a first line corresponding to a baseline portion of the detector output samples and a second line corresp... | 05/16/2006 |
| 6954451 | Distributed time-multiplexed bus architecture and emulation apparatus A time-multiplexed data bus driver circuit includes a plurality of combinatorial circuits, each of the circuits forming a logic combination of a datum value, a datum enable signal and a datum timeslot signal, the plurality of circuits producing a plurality of output... | 10/11/2005 |
| 6798851 | Decoding for a non-linear codec A decoding system to achieve rates higher than 33.6 kbps in the analog modem to digital modem direction. The decoding system modifies the standard Tomlinson Harashima Precoding algorithm to adapt it for use in PCM modems. Instead of an arithmetic modulo operation th... | 09/28/2004 |
| 6785339 | Method and apparatus for providing speech quality based packet enhancement in packet switched networks An apparatus (200) checks voice quality when in a vocoder bypass mode. If the voice quality level is beyond an acceptable range, the apparatus (200) ends the vocoder bypass mode and returns to tandem vocoding. For example, a vocoder bypass controller (... | 08/31/2004 |
| 6614839 | Method and apparatus for identifying the encoding type of a central office codec A technique for identifying the encoding law utilized by a central office codec may be implemented in a receive modem. The encoding law, which is typically dictated by the country in which the central office is located, is employed to generate a plurality... | 09/02/2003 |
| 6542097 | Adaptive delta modulation with step size variation responsive to sensed overload A data conversion device converts a series of digital signals into an analog signal. The device has a current selection circuit that can vary the direction and magnitude of the current it outputs and an integrating circuit that integrates the current supp... | 04/01/2003 |
| 6504866 | System and method for eliminating companding conversion distortion on international modem calls A data communication system and method that reduces conversion distortion on data calls between locations that encode telephone signals according to different conversion standards is disclosed. The data communication system (40) includes a first switch (4... | 01/07/2003 |
| 6381266 | Method and apparatus for identifying the encoding type of a central office codec A technique for identifying the encoding law utilized by a central office codec may be implemented in a receive modem. The encoding law, which is typically dictated by the country in which the central office is located, is employed to generate a plurality... | 04/30/2002 |
| 6188677 | Telephone apparatus used for computer network telephone system A telephone apparatus of a telephone system, including at least one server for connecting a plurality of telephone apparatuses connected to a computer network, comprises: a communication circuit means for processing data to and from said computer network;... | 02/13/2001 |
| 6118812 | Digital equalization in the presence of quantization noise A method is presented to enable the impulse response of a channel to be identified when the received signal contains a large amount of quantization noise. A probabilistic estimate of the distribution of the quantization noise is subtracted from the summat... | 09/12/2000 |
| 5963582 | Mitigation of multipath effects in global positioning system receivers A technique for minimizing or eliminating the effect of multipath signals in a receiver processing pseudorandom (PRN) code signals, such as in a global positioning system (GPS) receiver. The presence of multipath signals adversely affects both code measur... | 10/05/1999 |
| 5946353 | Method and apparatus for external intermediate data processing Disclosed is a system for selectively enabling intermediate data processing of digital signals external to an integrated circuit (IC). The system comprises a transcoder, a codec connected to the transcoder, and a data processor located externally to the I... | 08/31/1999 |
| 5933451 | Complexity determining apparatus Apparatus for determining a complexity measure of a data signal is disclosed which includes an encoder, having an input terminal responsive to a data input signal and a data output terminal producing a coded output signal representing the data input signa... | 08/03/1999 |
| 5727023 | Apparatus for and method of speech digitizing A speech encoder converts analog speech signals into a stream of binary coded speech samples. A circuit for performing analog to digital conversion compares an input speech signal with a signal from a digital integrator. Based on the comparison a series o... | 03/10/1998 |
| 5657351 | Method and apparatus for external intermediate data processing Disclosed is a system for selectively enabling intermediate data processing of digital signals external to an integrated circuit (IC). The system comprises a transcoder, a codec connected to the transcoder, and a data processor located externally to the I... | 08/12/1997 |
| 5652782 | Digital telephone overcoming international incompatibilities A digital telephone (60) comprises send equipment (40) and receive equipment (50), coupled via a signal splitter/combiner (61) onto a digital telephone line (62) for communication with a remote party (90). The send equipment (40) comprises an A-law map (1... | 07/29/1997 |
| 5646959 | Terminal adapter capable of reducing a memory capacity of a buffer memory In a terminal adapter which is located between a data terminal equipment unit (11) and a data communication network (12) and which includes a buffer memory (22, 27) for memorizing an original data signal sequence sent from each of the data terminal equipm... | 07/08/1997 |
| 5621760 | Speech coding transmission system and coder and decoder therefor A speech coding transmission system is disclosed in which a coder of a differential coding system quantizes a difference between a predictive value from an adaptive predictor and an input speech signal by an adaptive quantizer in accordance with the level... | 04/15/1997 |
| 5347562 | Synchronizing groups of base stations in time division duplex communication systems A telephone system in which communication between fixedly sited primary stations and transportable secondary stations is by way of respective time division duplex (TDD) radio links, particularly single frequency TDD links. In order to reduce radio interfe... | 09/13/1994 |
| 5317672 | Variable bit rate speech encoder A method and apparatus for allocating transmission bits for use in transmitting samples of a digital signal. An aggregate allowable quantization distortion value is selected representing an allowable quantization distortion error for a frame of samples of... | 05/31/1994 |
| 5291484 | Relay and exchange system for time division multiplex data A relay and exchange system includes a plurality of exchanges for relaying and exchanging transmission information contained in frames each composed of m bits, and are so constructed as to form a tandem connection by a plurality of transmission lines. A p... | 03/01/1994 |
| 5259001 | ADPCM decoder with an integral digital receive gain and method therefor An integral digital receive gain (44) for a G.721 or G.726 ADPCM decoder (28a) or the like in an application such as a CT-2 handset (20) allows digital volume control without the need for external components. The digital receive gain (44) receives a recon... | 11/02/1993 |
| 5155743 | Digital data converter A decoder for recovering an analog signal from its digital representation produced by an encoder employing adaptive-delta-modulation first decodes audio bit-stream (17) in the digital domain with digital delta demodulation (15), to a pulse-code-modulation... | 10/13/1992 |
| 5014284 | Discrete slope delta modulation with recovery means A method and apparatus for processing electrical signals by modifying delta modulation to discrete slope delta modulation includes converting its electrical signals into compressed digital information, and representing this digital information as a sequen... | 05/07/1991 |
| 4996696 | Waveform encoder A waveform encoder/decoder includes an encoder having an input for an audio signal to be encoded, and an output whereby the digitally encoded signal is passed to a transmission link and then to a corresponding decoder. The encoder includes detectors for m... | 02/26/1991 |
| 4940977 | Adaptive-filter single-bit digital encoder and decoder and adaptation control circuit responsive to bit-stream loading An adaptive single-bit encoder and decoder has its adaptive function determined by dynamically dividing the message frequency band into delta-sigma and delta modulation regimes of operation. In a practical embodiment this is accomplished by varying the co... | 07/10/1990 |
| 4939749 | Differential encoder with self-adaptive predictive filter and a decoder suitable for use in connection with such an encoder A differential encoder for speech encoding, typically in a 16 kHz wide band, has a self adaptive predictive filter, comprising a comparator receiving, on an additive input, successive samples of a signal to be encoded and, on a subtractive input, an estim... | 07/03/1990 |
