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| Number | Title | Issue Date |
| 8175169 | Method and system for optimizing quantization for noisy channels Methods are described for configuring a quantizer to achieve improved end-to-end distortion performance when transmitting encoded source data over a noisy channel. The codebook and partitioning are selected using an iterative process of determining an updated codebo... | 05/08/2012 |
| 8149927 | Method of and apparatus for encoding/decoding digital signal using linear quantization by sections A method of encoding/decoding a digital signal using linear quantization by sections, and an apparatus for the same are provided. The method of encoding includes: converting a digital input signal, and removing redundant information from the digital signal; allocati... | 04/03/2012 |
| 8098742 | Gain control method and apparatus An analog/digital gain control device avoid some of the requirements associated with the nature of a closed-loop AGC circuits and which meets the remaining requirements without much difficulty uses an analog to digital conversion method that increases the number of ... | 01/17/2012 |
| 8045625 | Encoding and decoding method to control a direct current (DC) component, and data processing apparatus performing the same An encoding method includes partitioning an input stream into first sub-blocks and second sub-blocks, encoding the second sub-blocks based on a number and location of reference sub-blocks to generate third sub-blocks when at least one of the first sub-blocks corresp... | 10/25/2011 |
| 7983346 | Method of and apparatus for encoding/decoding digital signal using linear quantization by sections A method of encoding/decoding a digital signal using linear quantization by sections, and an apparatus for the same are provided. The method of encoding includes: converting a digital input signal, and removing redundant information from the digital signal; allocati... | 07/19/2011 |
| 7894536 | Calibration model to mitigate data conversion errors An error model can be utilized to mitigate errors associated with a conversion system, such as an analog-to-digital or digital-to analog converter. The error model is adaptively calibrated to approximate error characteristics associated with at least a portion of th... | 02/22/2011 |
| 7787543 | Pulse pattern generator and communication device evaluation system utilizing the same A pulse pattern generator (11) has a pulse generating unit (12) and a lowpass filter (14), and the pulse generating unit (12) includes an amplitude-value setting unit (13, 13a). The pulse generating unit (12) generate... | 08/31/2010 |
| 7639744 | Programmable digital bandpass filter for a codec circuit A codec circuit having a programmable digital bandpass filter is disclosed. According to one aspect, a bandpass filter matches the filter characteristics of the codec circuit to a transmitted pulse code modulation (PCM) signal. The codec circuit includes at least on... | 12/29/2009 |
| 7532671 | Gain control method and apparatus An analog/digital gain control device avoid some of the requirements associated with the nature of a closed-loop AGC circuits and which meets the remaining requirements without much difficulty uses an analog to digital conversion method that increases the number of ... | 05/12/2009 |
| 7406157 | Methods and apparatuses for determining loop characteristics using an extended voice-band modem Embodiments of the invention provide methods for determining the characteristics of a local loop using the multi-carrier tones of a DSL activation process. For one embodiment, one or more sets of downstream multi-carrier tones of a digital subscriber line activation... | 07/29/2008 |
| 7391814 | Gain control method and apparatus An analog/digital gain control device avoid some of the requirements associated with the nature of a closed-loop AGC circuits and which meets the remaining requirements without much difficulty uses an analog to digital conversion method that increases the number of ... | 06/24/2008 |
| 7391813 | Digital wireless communications device A digital wireless communications device enabling call distance to be increased while avoiding mute processing as far as possible, even if code error occurs in an ADPCM code. The digital wireless communications device may be configured to include: an error detector ... | 06/24/2008 |
| 7376189 | Remote control signal reception circuit, remote control signal reception method, remote control signal reception program, and computer-readable storage medium storing the program The subject invention provides a remote control signal reception circuit that carries out quantization of an input data signal 101 by sampling the signal with a first sampling frequency that is higher than a frequency of said input data signal, and stores a r... | 05/20/2008 |
| 7355540 | Multi stage noise shaping quantizer The present invention is an multi stage noise shaping quantizer which includes: a first noise shaping quantizer that includes a first local quantizer which quantizes an input signal and a limiter which limits an output range of the first local quantizer, the first n... | 04/08/2008 |
| 7348897 | Apparatus for transmitting position detection signal of multi-shaft motor An apparatus for transmitting a position detection signal of a multi-shaft motor whereby a parallel-form detection signal that is output from position-detecting devices disposed on each of a plurality of motors and used for indicating a motor rotation position can b... | 03/25/2008 |
| 7346113 | Method and circuit for stop of signals quantized using noise-shaping A system and method are provided for stopping a quantized signal from a noise-shaper with a significantly reduced inband transient, compared to a traditional random stop of a noise-shaped signal. The noise-shaped signal is stopped at a favorable time controlled by a... | 03/18/2008 |
| 7330555 | Coding device and method, and recording medium An L-channel signal and an R-channel signal are input into a subtractor in which the difference between the L-channel signal and the R-channel signal is determined. The resulting signal is input into first and second multipliers. In the first multiplier, a mixed out... | 02/12/2008 |
| 7328151 | Audio decoder with dynamic adjustment of signal modification Methods and devices for dynamically adjusting a multi-band signal-modification profile based on a psychoacoustic model are disclosed. In one arrangement, the encoding parameter side information is used to estimate encoding noise of an encoded signal. The signal spec... | 02/05/2008 |
| 7324598 | Apparatus and method to reduce quantization error An apparatus includes a quantizer to generate a quantized signal from an input signal and a function unit may be included to generate an output signal by applying a predetermined function to the quantized signal. The apparatus further may include a correction unit t... | 01/29/2008 |
| 7321634 | Method and apparatus for variable sigma-delta modulation A method and apparatus for modulating a digital input signal is disclosed. The digital input signal is partitioned into a less-significant bit signal and a more-significant bit signal. A lower-order modulation of the less-significant bit signal is performed to gener... | 01/22/2008 |
| 7315264 | Systems and methods for controlling transient response in the output of a noise shaper Systems and methods implemented in a multi-bit digital noise shaper for reducing or eliminating undesirable transient response when the noise shaper exits a clipping state. In one embodiment, the noise shaper includes a quantizer, a filter, and a filter control unit... | 01/01/2008 |
| 7292902 | Frame-based audio transmission/storage with overlap to facilitate smooth crossfading Methods for splicing PCM audio frames form modified frames by appending to each frame either a portion of the next preceding frame or the next following frame. According to a first approach, splices are obtained by fading up and fading down a frame end and a frame a... | 11/06/2007 |
| 7281140 | Digital throttle for multiple operating points A processor includes a digital throttle to monitor the activity of various units of the processor's instruction execution pipeline. The monitored activity is scaled according to the current operating point of the processor and a power state is determined from the sc... | 10/09/2007 |
| 7281176 | Determining signal quality and selecting a slice level via a forbidden zone In one embodiment, a method may determine a number of data transitions occurring in a forbidden zone at each of a first and second slice levels and adjust a slice level offset for an amplifier based on the number of data transitions at the first and second slice lev... | 10/09/2007 |
| 7272174 | Upstream data transmission A process transmits digital data to an A/D converter via an analog channel. The process includes generating a sequence of output signals by precoding a sequence of input signal points to precompensate for ISI in the analog channel. In the precoding is matched to the... | 09/18/2007 |
| 7266152 | Digital signal processing device and digital signal processing method A device for performing predetermined processing on an input signal that may have a signal amplitude of more than one bit. The input signal is obtained by subjecting one-bit serial signals to predetermined signal processing, wherein the signal amplitude of more than... | 09/04/2007 |
| 7251270 | Systems and methods for fractional bit rate encoding in a communication system Systems and methods for encoding fractional bit rates in a communication system, such as a pulse amplitude modulation (PAM) communication system, are provided. The systems and methods enable a first transceiver to specify to a second transceiver a desired fractional... | 07/31/2007 |
| 7245675 | Upstream data transmission A process transmits digital data to an A/D converter via an analog channel. The process includes generating a sequence of output signals by preceding a sequence of input signal points to precompensate for ISI in the analog channel. In the preceding is matched to the... | 07/17/2007 |
| 7242730 | Mirror suppression circuit and receiver using such circuit A mirror suppression circuit includes a first quadrature signal path coupled between quadrature signal input and output terminals and an error correction circuit for correction of amplitude and phase errors in a carrier modulated quadrature signal. To obtain a suppr... | 07/10/2007 |
| 7233271 | Noise shaper circuit and method for reducing switching noise Noise that is normally generated during the switching of a noise shaper may be reduced by switching the noise shaper to an inactive or off state after the occurrence of one or more predetermined criteria, for example the detection of a predetermined number of data v... | 06/19/2007 |
| 7233746 | Wide dynamic range sensor signal processing method & circuitry for analog and digital information signals A sensor provides an analog sensor output signal that is first converted by a A/D converter, followed by a digital signal processor having a digital signal output that is converted to an analog signal by way of a D/A converter so as to provide an analog information ... | 06/19/2007 |
| 7233624 | Method and system for all digital gain control An analog/digital gain control device avoid some of the requirements associated with the nature of a closed-loop AGC circuits and which meets the remaining requirements without much difficulty uses an analog to digital conversion method that increases the number of ... | 06/19/2007 |
| 7227910 | Communication device with configurable sigma-delta modulator In up-to date communication devices an intermediate frequency signal is generated at first in a digital way and than is converted to an analogue signal by a digital-to-analogue converter (10). In order to offer a greater flexibility in choosing a particular d... | 06/05/2007 |
| 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 |
| 7218693 | Method and apparatus for channel estimation in a packet based transmission system having reduced complexity A method and apparatus for deriving the channel estimation within a packet based transmission system having a predetermined number of tones (N), wherein each channel has a channel order (L). A first method includes precomputing, from the long sequence (X) of a recei... | 05/15/2007 |
| 7212136 | Recursive bit-stream converter and a method for recursive bit-stream conversion A Recursive bit-stream converter (Rebic) having digital low pass filter and multi-bit quantizer means in a feedback arrangement and means to serialize digital words obtain a non-integer Rebic factor via at least two quantizers that are successively operative to seri... | 05/01/2007 |
| 7209878 | Noise feedback coding method and system for efficiently searching vector quantization codevectors used for coding a speech signal A system for performing a computationally efficient method of searching through N Vector Quantization (VQ) codevectors for a preferred one of the N VQ codevectors predicts a speech signal to derive a residual signal, derives a ZERO-INPUT response error vector common... | 04/24/2007 |
| 7206563 | Reduction of radio frequency interference (RFI) produced by switching amplifiers Apparatus and methods for reducing radio frequency interference produced by switching amplifiers, includes a variable-order noise shaper in a system that includes an AM tuner. An alternative implementation involves determining the tuned frequency of a radio signal. ... | 04/17/2007 |
| 7206740 | Efficient excitation quantization in noise feedback coding with general noise shaping In a Noise Feedback Coding (NFC) system operable in a ZERO-STATE condition and a ZERO-INPUT condition, the NFC system including at least one filter having a filter memory, a method of updating the filter memory. The method comprises: (a) producing a ZERO-STATE contr... | 04/17/2007 |
| 7203242 | Code rate adaptive encoding/decoding arrangement and method for a pulse code modulation system A code rate adaptive encoding/decoding arrangement and method for a pulse code modulation system comprises a code rate adaptor and a code capacity meter to dynamically produce a code rate adaptive signal for the code length of the pulse code modulation adaptive to a... | 04/10/2007 |
