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7518538 Adaptive entropy coding compression with multi-level context escapes  
The performance (compression ratio) of an entropy coding compressor can be improved by separating its output into two streams: encoded output symbols compressed according to a probability model,...
7498964 Analog interface for digital instrumentation  
Nuclear spectroscopy systems have improved over the course of time especially with the advent of digital pulse processing. One disadvantage of digital processing, however, is that it has eliminated...
7489263 Discrete-time programmable-gain analog-to-digital converter (ADC) input circuit with multi-phase reference application  
A discrete-time programmable-gain analog-to-digital converter (ADC) input circuit with multi-phase reference application, provides a high input impedance level substantially independent of input...
7477173 Combined AD/DA converting apparatus  
A combined AD/DA converting apparatus includes an input signal selection circuit configured to select one analog signal out of a plurality of analog input signals based on an input selection...
7188196 Method and apparatus for playing analog audio to multiple codec outputs  
Method and apparatus for playing analog audio in an electronic audio system having multiple audio codecs, only one of which has a direct hardware connection to the analog audio source. First analog...
7138932 Signal converting apparatus for integrating analog-to-digital converter and digital-to-analog converter and integration unit  
A signal converting apparatus for integrating an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC) and an integration unit thereof are provided. The present invention...
7088272 Pipeline arithmetic code decoding method and apparatus using context index predictor  
An arithmetic code decoding apparatus including a context index predictor which predicts a context index, a pipeline arithmetic code decoder which executes a decoding process of the bitstream using...
6909935 Methods with resolution enhancement feature for improving accuracy of conversion of required chemical mechanical polishing pressure to force to be applied by polishing head to wafer  
CMP methods in which a polishing pad is moved relative to a wafer and a retainer ring implement instructions for applying required pressure to the wafer for CMP operations. Accuracy of computations...
6725120 Apparatus and methods with resolution enhancement feature for improving accuracy of conversion of required chemical mechanical polishing pressure to force to be applied by polishing head to wafer  
CMP systems and methods in which a polishing pad is moved relative to a wafer and a retainer ring implement instructions for applying required pressure to the wafer for CMP operations. Accuracy of...
6583745 A/D converter  
An A/D converter has a successive approximation register having a plurality of A/D registers each corresponding to one of A/D inputs. A capacitor in a comparator is charged by a voltage determined...
6577987 Operational monitoring for a converter  
Monitoring a converter ( 1 ) includes detecting whether a value of an input variable ( 2 ) for the converter ( 1 ) assumes a first prescribed input reference value ( 41 ) and checking whether an...
6498577 Piecewise-linear, non-uniform ADC  
A non-uniform analog-to-digital converter (ADC) produces digital output data representing the magnitude of an analog input signal having a non-uniform magnitude probability distribution. The...
6448914 Integrated circuit for conditioning and conversion of bi-directional discrete and analog signals  
An integrated circuit chip for interfacing a digital computer to sensors and controlled devices can be configured to accept and provide a variety of analog and discrete input and output signals....
6407691 Providing power, clock, and control signals as a single combined signal across an isolation barrier in an ADC  
The present invention provides an isolated analog-to-digital converter system including an analog-to-digital subsystem including an analog-to-digital converter for converting an analog signal to a...
6347123 Low-current sample rate converter  
A low power sample rate converter adapted for use with a telecommunications system transceiver. The sample rate converter includes a first circuit that provides an input signal characterized by a...
6260085 Changeover device which uses both analog and digital signals as input signals and supplies an analog output signal  
The invention relates to a changeover device which uses both analog and digital signals as input signals and supplies an analog output signal. The changeover device contains a digital-to-analog...
6211802 Semiconductor integrated circuit for performing data transfer  
A semiconductor integrated circuit for performing data transfer integrated circuit includes a first circuit, a second circuit, and first and second data converters. The first circuit outputs data...
5995033 Signal conditioning circuit including a combined ADC/DAC, sensor system, and method therefor  
An electronically calibrated sensor (100) includes a sensing element (102) with an output coupled to a signal conditioning circuit (104). The signal conditioning circuit (104) is adapted to be...
5929796 Self-calibrating reversible pipeline analog to digital and digital to analog converter  
A self-calibrating reversible pipeline analog to digital converting architecture configured to convert an input analog signal to an output digital signal and further to convert an input digital...
5896100 Method and apparatus for analog-to-digital or digital-to-analog conversion  
An analog-to-digital converter circuit is disclosed that is capable of converting both positive and negative analog input signals, and that is capable of operating as either an analog-to-digital...
5594438 Analog-to-digital converter  
An analog-to-digital converter circuit is disclosed that is capable of converting both positive and negative analog input signals, and that is capable of operating as either an analog-to-digital...
5493300 Circuit configuration for a D/A and A/D converter  
Using only one R2R network, driven by a digital logic, it is possible to implement both a D/A and A/D converter, An existing stabilized voltage V cc is used instead of a separate reference voltage...
5432513 Codec  
In a codec having a coding section A/D converting an analog signal into a digital signal, and a decoding section D/A converting a received digital signal into an analog signal, a decoding timing...
5404141 Signal converting apparatus utilizing an analog-digital converting section and a digital-analog converting section  
There is provided a signal converting apparatus using a semiflash type A/D converter comprising an analog-digital (A/D) converting section and a digital-analog (D/A) converting section, wherein the...
5389925 A/D and D/A conversion device with shared parameter generators  
The inventive A/D and D/A conversion device replaces the conventional parameter generators, which are provided in pairs for supplying same filter parameters to the decimation and interpolation...
5373292 Integration type D-A/A-D Conversion apparatus capable of shortening conversion processing time  
An integrating D-A/A-D converter includes a reference value generation circuit for generating at least one reference value relating to voltage or current, a control circuit for carrying out...
5345234 Method and apparatus for combining a flash analog to digital converter with digital to analog functions  
A converter circuit provides analog to digital and digital to analog functions on a single silicon device. A flash analog to digital converter produces digital outputs using comparators which each...
5317529 Digital filter using intermediate holding registers and common accumulators and multipliers  
An A/D-D/A converting apparatus, in which a multiplier is omitted by storing the multiplied result of a filter coefficient and a digital signal in advance and reading it out responsive to the...
5252972 Codec having controllable frame synchronizing and clocking signals  
A codec comprises a control circuit for generating a frame synchronous signal and a clock signal which are controlled to comply with different types of data carried on a received digital signal to...
5003309 Apparatus having shared architecture for analog-to-digital and for digital-to-analog signal conversion  
An apparatus adaptable for use in effecting communications between an analog device and a digital device, having an analog-digital-analog circuit for converting incoming analog signals received...
5001480 Analog-to-digital and digital-to-analog conversion system and echo cancellation device including the same  
A conversion system is disclosed for performing either an analog-to-digital A/D conversion associated with an amplification step or a digital-to-analog D/A conversion associated with an attenuation...
4908620 Analog-to-digital and digital-to-analog converter  
An analog-to-digital and digital-to-analog converter includes an array of capacitors each being differently weighed from the others, one electrode of each of the capacitors being connected to a...
4622536 Ratio independent cyclic A/D and D/A conversion using a reciprocating reference approach  
An algorithmic analog-to-digital and digital-to-analog converter 10 combines the techniques of switched capacitor cyclic conversion by using first and second amplifiers 31, 32 with capacitors C 1 ,...
4609906 Digital-to-analog/analog-to-digital dual mode circuit  
A circuit operable in two modes alternatively to provide a digital-to-analog converter capability and an analog-to-digital converter capability is disclosed utilizing a single digital multiplexer...
4454500 Analog data acquisition device  
An analog data acquisition device fetches a plurality of analog data by a multiplexer in time-division, compares the analog data fetched with a reference value applied from a digital-to-analog...
4445111 Bi-polar electronic signal converters with single polarity accurate reference source  
Bi-polar electronic signal converters, such as analog-to-digital or digital-to-analog converters, with a single polarity accurate reference source are disclosed. In one polarity direction, the...
4404544 μ-Law/A-law PCM CODEC  
In a PCM CODEC, a binary-weighted charge redistribution capacitor array is designed to be configured for either μ-law or A-law coding. Selection of one or the other coding configuration is...
4385286 Use of single reference voltage for analog to digital or digital to analog conversion of bipolar signals  
In an analog to digital converter circuit for a CODEC a single reference voltage is used for comparing both positive and negative input signals. The circuit comprises a capacitor array to define...
4384278 One-bit codec with slope overload correction  
In a delta modulation coder and decoder system, the disadvantageous effects of slope overload are eliminated by reversing the polarity of the feedback signal in the coder and the polarity of the...
4380756 Charge redistribution circuit having reduced area  
A codec using charge redistribution techniques between two groups of banks of weighted capacitors, which requires substantially reduced chip area as compared to previous codecs of this type. A...
4367456 PCM and PAM Conversion circuit including signal level variation on the PCM portion of the circuit  
A conversion circuit for use with digital telephone switching equipment for converting pulse amplitude modulation (PAM) signals into pulse code modulated (PCM) signals and for converting PCM...
4350975 Dual bandwidth autozero loop for a voice frequency CODEC  
An autozero loop for eliminating offsets in the analog to digital converter section of a voice frequency coder-decoder (CODEC) utilizing an array of capacitors and a linear resistor string. The...
4348768 PCM Codec using common D/A converter for encoding and decoding  
A codec (coder/decoder), having particular utility in a pulse code modulation (PCM) communications system employing per-line coding and decoding, employs a common digital-to-analog (DAC) converter....
4291298 Reversible analog to digital converter with high precision  
A reversible analog to digital converter is designed for high precision in the interrelation of analog voltages and binary digital representations. An upper and a lower limit voltage converge on...
4250492 Non-uniform weighting circuitry  
A non-uniform weighting circuitry which is effective for enhancing speed and accuracy in the operations of encoders and decoders comprises in a cascade connection a constant current switch, a...
4203092 Analogue-to-digital converter  
The basic dual channel pcm coder/decoder arrangement provides PCM/Analogue Codec facilities for use in speech transmission and comprises (a) a pair of transmit channel amplifiers and a pair of...
4184152 Circuit for converting from analog signal into digital signal and vice versa by using insulated gate field effect transistors  
A signal converting circuit for converting an analog signal to a digital signal, or vice versa, comprises a sampling capacitor which is charged to an input signal level during the period of a...
4162376 Conference call circuit using reversible analog to digital converter  
A circuit arrangement is disclosed for individual subscribers in a telecommunication set up. The circuit arrangement converts analog signals into digital signals and digital signals into analog...
4160243 Asynchronous reversible analog to digital converter  
An asynchronous signal processing circuit device having an A-D converter and a D-A converter in which a single ladder voltage generating circuit is commonly or jointly used by changing over a...
4151518 Controlling asynchronous conversion between analog and digital parameters  
A PCM codec for converting between PCM words and analog signals has at least one element which is used for both types of conversions even though the clock pulse frequencies of the incoming and...
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