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| Number | Title | Issue Date |
| 8098743 | Pilot signal transmission method and radio communication system for enabling measurement of reception quality with high accuracy In a pilot signal transmission method for raising the SIR measurement accuracy for transmission power control during high-speed transmission and thus reducing the block error rate and improving the throughput, a first SIR value measured by first pilot signals and se... | 01/17/2012 |
| 7522669 | Method and apparatus for selective disregard of co-channel transmissions on a medium A method and apparatus to selectively disregard co-channel transmissions on a medium uses an automatic gain control/clear channel assessment (AGC/CCA) circuit to gather signal power information, which is used to establish receiver sensitivity thresholds. Raw and cyc... | 04/21/2009 |
| 7426371 | Method and system for repeat request in hybrid ultra wideband-bluetooth radio A method and system improves data throughput when performing error control in Ultra Wideband (UWB) communications. The method and system is capable of performing communications via a first wireless communications link and a second wireless communications link. The f... | 09/16/2008 |
| 7398058 | Method and system for repeat request in hybrid ultra wideband-bluetooth radio A method and system improves data throughput when performing error control in Ultra Wideband (UWB) communications. The method and system is capable of performing communications via a first wireless communications link and a second wireless communications link. The f... | 07/08/2008 |
| 7362253 | Introduction to R2RC D/A converter A Digital to Analog (D/A) converter has a plurality of stages. Each of the plurality of stages has a first resistive element. A second resistive element is coupled to the first resistive element and has approximately twice a resistive value of the first resistive el... | 04/22/2008 |
| 7358774 | Output driver circuit with pre-emphasis function In an output driver circuit and method, a control circuit generates a control signal in response to a current internal data signal. An output driver generates an output data signal in response to the control signal. A pre-emphasis circuit adjusts a current flowing t... | 04/15/2008 |
| 7323907 | Pre-emphasis driver control Embodiments for controlling pre-emphasis driver circuits for electrical signal interconnects within a computer system are disclosed. ... | 01/29/2008 |
| 7242718 | Coding standard selecting method and terminal device A coding standard selecting method for selecting a coding standard used for communications between a first terminal and a second terminal, each terminal supporting multiple coding standards, is disclosed. The first terminal transmits a first signal representing all ... | 07/10/2007 |
| 7215269 | Delta-sigma analog-to-digital converter suitable for use in a radio receiver channel A radio receiver channel includes an analog front end and a digital signal processing section coupled together by an analog-to-digital converter (ADC) having a delta-sigma modulator coupled to a first digital decimation filter, which is coupled to second digital dec... | 05/08/2007 |
| 7164299 | Output buffer circuit having pre-emphasis function An output buffer circuit having a so-called pre-emphasis function of emphasizing a signal waveform in data transmission in an information processing device or the like according to an attenuation of a transmission line, includes a first buffer which receives input o... | 01/16/2007 |
| 7145936 | Bandpass delta sigma truncator and method of truncating a multi-bit digital signal A bandpass delta sigma truncator receives a series of first multi-bit digital signals each having a number of data bits, a first number of sign bits and sign extending means for sign extending each of the first multi-bit digital signals to a second multi-bit digital... | 12/05/2006 |
| 7113119 | Electronic circuit with a sigma delta A/D converter The A/D convener has a digital output for outputting a digital output signal selected from a set of three or more available values. A feedback loop generates the digital output signal so that a time averaged difference between an analog input signal and an analog fe... | 09/26/2006 |
| 7075977 | Circuit for a transceiver output port of a local area networking device A driving circuit for a transceiver output port of a local area networking device is provided, including first and second current sources coupled to the ground, first and second resistors coupled to the supply voltage with the resistances of the first and second res... | 07/11/2006 |
| 7053808 | Suppressing digital-to-analog converter (DAC) error A digital-to-analog converter (DAC) error suppression arrangement suppresses DAC error arising from mismatched elements contained in a DAC (640 and/or 645) that is part of a modulator (FIG. 6). A low pass averaging (LPA) index decoder 650... | 05/30/2006 |
| 7034729 | Adding circuit suitable for sigma-delta modulator circuits An adding circuit includes storage capacitors and a a switch mechanism, the storage capacitors being charged up via voltage signals to be added during a first clock phase. During a second clock phase, the storage capacitors are connected in parallel, with the result... | 04/25/2006 |
| 7030792 | Suppressing digital-to-analog converter (DAC) error A digital-to-analog converter (DAC) error suppression arrangement suppresses DAC error arising from mismatched elements contained in a DAC (640 and/or 645) that is part of a modulator (FIG. 6). A low pass averaging (LPA) index decoder 650... | 04/18/2006 |
| 6933871 | Feedback steering delta-sigma modulators and systems using the same A digital to analog converter including an input for receiving an input signal, a ramp generator, and a delta-sigma modulator responsive to the input signal and an output of the ramp generator. An order of a noise shaping transfer function of the delta-sigma modulat... | 08/23/2005 |
| 6924760 | Highly accurate switched capacitor DAC In one set of embodiments the invention comprises a highly accurate, low-power, compact size DAC utilizing charge redistribution techniques. Two complementary conversions may be performed and added together to form a final DAC output voltage by performing charge red... | 08/02/2005 |
| 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 |
| 6611221 | Multi-bit sigma-delta modulator employing dynamic element matching using adaptively randomized data-weighted averaging A sigma-delta modulator disclosed herein provides a first order noise shaping of the errors associated with the multi bit DAC employing unit elements, without creating large in-band tones. The sigma-delta modulator includes a multi-bit ADC connected to re... | 08/26/2003 |
| 6486810 | Method and apparatus for continuously variable slope delta modulation coding of signals Continuously variable slope delta modulation coding uses a thresholder having an analog input and a digital output representing the relationship between a signal amplitude at the analog input and a predetermined threshold. An integrator has an output and ... | 11/26/2002 |
| 6393062 | Methods and circuits for generating a preemphasis waveform The present invention overcomes ISI by precompensating for the anticipated high-frequency energy losses in the transmission media. This precompensation is accomplished using a preemphasis waveform, i.e., driving the differential signal to a value larger t... | 05/21/2002 |
| 6384753 | High density analog interface An interface module includes a high density analog interface (HAI) for electrical interconnection between a programmable logic controller (PLC) and an analog to digital converter (ADC) or a digital to analog converter (DAC). The HAI includes a single appl... | 05/07/2002 |
| 6304608 | Multibit sigma-delta converters employing dynamic element matching with reduced baseband tones A method for reducing baseband tones and intermodulation distortions in a multibit sigma-delta converter employing dynamic element matching is disclosed. An N-level sigma-delta analog-to-digital converter includes an analog loop filter, an N-level quantiz... | 10/16/2001 |
| 5815530 | Data converters for sound equipment A delta modulation type data converter is adapted to carry out signal processing by sequentially comparing in cycles an inputted signal with a reference voltage set according to the results of previous comparisons and includes a plurality of current sourc... | 09/29/1998 |
| 5469475 | Transmitter comprising an eletronic arrangement for generating a modulated carrier signal An electronic arrangement for generating a modulated carrier signal in a transmitter includes a sigma-delta (one-bit) signal converter and a mixer. The sigma-delta converter includes, in a closed signal loop, an adder, a low pass filter, and a pulse shape... | 11/21/1995 |
| 5412430 | Image coding method and image coding apparatus In high efficiency coding of a motion image signal in transmission or recording of the motion image signal, plural prediction signals are determined by independently compensating a motion of reproduction signals of plural frames positioned before a frame ... | 05/02/1995 |
| 5323188 | DPCM predictive encoder In a DPCM predictive encoder (or performing DPCM prediction by digitizing a NTSC color television signal with a rate three times of a color sub-carrier frequency, a two-frame predictor which outputs a differential signal over two frames is employed as one... | 06/21/1994 |
| 5030954 | Double rate oversampled interpolative modulators for analog-to-digital conversion A circuit transformation that doubles the effective sampling rate of any switched capacitor oversampled, interpolative modulator, regardless of its order, employs, in each integrator of the modulator, a second input capacitor and switches that operate on ... | 07/09/1991 |
| 5027120 | Delta-sigma converter with bandpass filter for noise reduction in receivers Analogue signals are converted to digital data by use of a Sigma-Delta modulator including a pair of bandpass filters and a feedback loop including a digital to analogue converter. The tendency of such a circuit to instability is reduced or eliminated by ... | 06/25/1991 |
| 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 |
| 4937577 | Integrated analog-to-digital converter A feedback coder, which employs simple CMOS push/pull amplifiers as gain elements, along with a bistable circuit, in its preferred embodiment takes the form of a second-order delta-sigma modulator. The output of the modulator is converted into pulse code ... | 06/26/1990 |
| 4862169 | Oversampled A/D converter using filtered, cascaded noise shaping modulators An oversampling A/D converter for high resolution data conversion is provided. An analog input signal is quantized into a digital equivalent value with a finite quantization error associated therewith in a first circuit portion. An analog low pass filter ... | 08/29/1989 |
| 4860315 | ADPCM encoding and decoding circuits In an ADPCM encoding and decoding system comprising an encoder having an adaptive predictor and an adaptive quantizer and a decoder having an adaptive predictor and an inverse adaptive quantizer, the adaptive predictors each comprise: an adaptive-zero pre... | 08/22/1989 |
| 4833535 | Image transmission apparatus An input image signal is divided into blocks each of 8 x 8 pixels, is subjected to cosine transform and is then converted to a signal of a spatial frequency region. After the cosine transform, the data is subjected to subtraction with respect to first to ... | 05/23/1989 |
| 4831636 | Coding transmission equipment for carrying out coding with adaptive quantization Coding transmission equipment wherein an plurality of adaptive coding units having different processing characteristics are provided, and the adaptive coding unit having the optimum processing characteristic for a current input signal is selected from amo... | 05/16/1989 |
| 4819253 | Method for determining PCM coding law Apparatus and method for analyzing a bit stream to determine whether the stream is encoded in A-law PCM or μ-law PCM. Bit positions 2, 3, and 4 are examined to determine which of the 8 possible segment codes are present. Segment codes representing low am... | 04/04/1989 |
| 4796004 | Integrated analog-to-digital converter A feedback coder, which employs simple CMOS push/pull amplifiers as gain elements, along with a bistable circuit, in its preferred embodiment takes the form of a second-order delta-sigma modulator. The output of the modulator is converted into pulse code ... | 01/03/1989 |
| 4772871 | Delta sigma modulator circuit for an analog-to-digital converter In a delta-sigma modulator for an A/D converter for modulating an analog input signal to produce a modulated signal of a digital form, a first integrator produces a first integral signal indicative of an integral of the difference between the analog input... | 09/20/1988 |
| 4736188 | Analog to digital converters A high resolution analog to digital converter comprising a low resolution analog to digital converter and an interpolating digital to analog converter, the interpolating digital to analog converter having a second order digital controller and a one bit qu... | 04/05/1988 |
