Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 8176107 | Multi-standard multi-rate filter A method is provided for decimating a digital signal by a factor of M and matching it to a desired channel bandwidth. The method applies the digital signal input samples to a (M-1) stage tapped delay line, downsamples the input samples and the output samples of each... | 05/08/2012 |
| 8145693 | Fir filter apparatus, audio apparatus and fir filter program A coefficient compensating unit 33 calculates based on a loop point and a cross-fade point of impulse response coefficient data renewed compensation impulse response coefficients specified for a cross-fade period defined between the cross-fade point and an en... | 03/27/2012 |
| 8131790 | Decimation filter A decimation filter has: a plurality of calculating devices each having a multiplier and an accumulator; a plurality of coefficient memories (a ring memory and shift registers) which store filter coefficients, and which correspond to the calculating devices, respect... | 03/06/2012 |
| 8065355 | Interpolation FIR filter having multiple data rates in mobile communication system and method of filtering data using the same The present invention relates to an interpolation FIR (finite impulse response) filter having multiple data rates in a mobile communication system, and a method of filtering data using the same. In the method of filtering data using the interpolation FIR filter, a f... | 11/22/2011 |
| 8032575 | Digital signal processing apparatus and digital signal processing method A digital signal processing apparatus including: an arithmetic circuit that performs first digital signal processing on an input signal SA sampled at a first sampling frequency f1 and second digital signal processing on a result of the first digital signal pr... | 10/04/2011 |
| 7991814 | Ultra fast circuitry for digital filtering The invention includes a novel differentiator cell, a novel resample unit cell, and precision synchronization circuitry to ensure proper timing of the circuits and systems at the anticipated ultra-high speed of operation. The novel differentiator cell includes circu... | 08/02/2011 |
| 7958177 | Method of parallelly filtering input data words to obtain final output data words containing packed half-pel pixels The present invention is to provide a parallel filtering method, which is implemented to an interpolation filter and comprises the steps of separating coefficients of the interpolation filter into two sets comprising the positive and negative coefficients respective... | 06/07/2011 |
| 7953783 | Interpolating cubic spline filter and method A filter for high speed digital signal processing. In one embodiment the filter includes a linear, phase-B, interpolating cubic spline filter having a pre-filter section and an interpolating post-filter section. The pre-filter section may be formed to implement any ... | 05/31/2011 |
| 7949699 | Implementation of decimation filter in integrated circuit device using ram-based data storage A programmable integrated circuit device such as a programmable logic device can be configured as a finite impulse response (FIR) filter capable of operating in decimation mode. The device includes at least one user-configurable random access memory block, and that ... | 05/24/2011 |
| 7890564 | Interpolation FIR filter and method thereof An interpolation FIR filter uses a coefficient to generate an interpolation value of a first and second input value. The interpolation FIR filter has several arithmetic units, an adder, and a divider. The nth arithmetic unit outputs a partial product by s... | 02/15/2011 |
| 7890563 | Multi-channel sample rate conversion method A sampling-rate conversion method receives N input channels which have been digitized at an input sampling rate, and converts the sampling rate of each input channel to produce N output channels at an output sampling rate. The method comprises computing a common FIR... | 02/15/2011 |
| 7860913 | Sound signal processing system and related apparatus and method The invention discloses a finite impulse response (FIR) filter for processing a digital input signal to generate a digital output signal. The FIR filter has a tap amount N and a decimation ratio D. The FIR filter includes a first memory, a multiplier, and an accumul... | 12/28/2010 |
| 7856464 | Decimation filter A system and method for decimating a digital signal is disclosed. The system includes an input to receive digital data, a control input to receive a desired decimation rate, and an integrator stage responsive to the input. The system also includes a variable rate do... | 12/21/2010 |
| 7788309 | Interleaved comb and integrator filter structures Filter system embodiments are provided for realizing interpolation and decimation processes with interleaved filter structures. These interleaved structures enable the systems to obtain output data rates that exceed the highest operation rates of the system componen... | 08/31/2010 |
| 7774394 | Exponentiated polyphase digital filter The structure of a digital filter is provided through exponentiation of a polyphase digital filter. This exponentiation may be accomplished by determining an expression for the polyphase digital filter in terms of its polyphase components, and raising the expression... | 08/10/2010 |
| 7752248 | System and method for video processing Method and apparatus for decimating or sub-sampling image data which uses fixed delay intervals to accumulate a weighted sum of input samples. The accumulated sum is output at selected intervals, the interval determining the degree of decimation. The apparatus can t... | 07/06/2010 |
| 7747666 | Parallel filter realization for wideband programmable digital radios A block polyphase filter is constructed of a set of filter blocks having different filter functions, and being arranged for parallel processing of portions of an input sequence of signals. Signals of the input sequence are divided among the blocks by a demultiplexer... | 06/29/2010 |
| 7702710 | Digital signal processor optimized for interpolation and decimation A digital signal processor receives samples of a first digital signal which is to be decimated and samples of a second digital signal which is to be interpolated. A digital signal processing engine performs a decimation function on samples of the first digital signa... | 04/20/2010 |
| 7698355 | Minimal area integrated circuit implementation of a polyphase interpolation filter using coefficients symmetry A minimal area integrated polyphase interpolation filter uses a symmetry of coefficients for a channel of input data. The filter includes an input interface block for synchronizing the input signal to a first internal clock signal; a memory block for providing multi... | 04/13/2010 |
| 7685218 | High frequency signal construction method and apparatus A method of adding high frequency content to an input signal to form an augmented signal, the method comprising the steps of: (a) providing an initial signal having a first predetermined lower spectral range; (b) utilizing the initial signal to form synthesized high... | 03/23/2010 |
| 7685217 | Channel-select decimation filter with programmable bandwidth A channel-select decimation filter capable of operating in multiple bandwidth modes includes a first low pass filter stage, a variable gain stage, a subtraction module a second low pass filter stage and a down-sampling module. The first low pass filter stage include... | 03/23/2010 |
| 7680869 | Interpolation and decimation using newton polyphase filters An interpolation filter for interpolating a digital signal includes a cascade of template filters, each having an identical template transfer function A(z), which is arranged to receive and filter an input sequence representing the digital signal sampled at an input... | 03/16/2010 |
| 7613760 | Efficient implementation of multi-channel integrators and differentiators in a programmable device Efficiently implemented multi-channel integrators and multi-channel differentiators utilize a delay section in a single integrator or differentiator in lieu of parallel integrator or differentiator lines to handle multi-channel data flow and processing. The delay se... | 11/03/2009 |
| 7599978 | Digital signal decimation by subspace projection A digital signal, x(n) (where n is an integer), is decimated by determining a signal vector, y(k), of size M by partitioning samples of the digital signal, x(n) according to sampling phases of the samples. The signal vector, y(k), is projected onto an N-dimensional ... | 10/06/2009 |
| 7587440 | Digital filter and filtering method The digital filter has a first-stage decimation filter and a second-stage decimation filter. The second-stage decimation filter has a shifter that performs shift operation on a filter coefficient, a complementer that performs complementary operation on the filter co... | 09/08/2009 |
| 7577696 | Multirate filter as well as display system and mobile telephone comprising said multirate filter A multirate filter according to the invention comprises, a) an input unit (10) for receiving an input signal (Sin) and for providing a plurality of intermediate signals (IS1, IS2) in response to said input signal, b) a filter unit (20) co... | 08/18/2009 |
| 7529787 | Apparatus and method for generating coefficient data, apparatus and method for processing information signal, program, and medium for recording the same A device generates coefficient data of an estimating equation for converting a first information signal to a second information signal. The device performs decimation on a teacher signal to generate a student signal and acquires plural training data items from the t... | 05/05/2009 |
| 7472150 | Method and system for time sharing N consecutive half-band decimating-by-2-filters using a single filter A method and system for time sharing N consecutive half-band decimating-by-2-filters using a single filter. Aspects of the method may comprise selecting a latched input signal and filtering, via a single decimating filter, the selected latched input signal to genera... | 12/30/2008 |
| 7467172 | N dimensional non-linear, static, adaptive, digital filter design using D scale non-uniform sampling The present invention is a filter design that extracts information from a signal by employing D scale nonuniform sampling. In one embodiment a D scale multiresolution sampler, filter bank router, filter bank sampler controller, phase shifter, and consolidator consti... | 12/16/2008 |
| 7439885 | Method and system for sample rate conversion Described herein is a method and system for sampling rate conversion. A clamped cubic spline interpolator (CCSI) may be utilized to interpolate or decimate a source signal to provide samples at times based on a sink rate. The source clock and sink clock may be drive... | 10/21/2008 |
| 7436333 | Asynchronous sample rate converter Various embodiments perform sample rate conversion of a sample series at an input rate to an output rate. A version of the sample series is corrected with timing error information generated by a digital loop. The digital loop is locked to a first rate and clocked at... | 10/14/2008 |
| 7424502 | Non-uniform filter bank implementation A method of searching for a best-match decimation vector of decimation factors for non-uniform filter bank, the best match vector allowing perfect or near-perfect reconstruction of an input signal of the non-uniform filter bank, the method including the steps of: a)... | 09/09/2008 |
| 7415493 | Asynchronous sampling rate conversion An adaptive proportional integral control loop determines a ratio of the input sampling rate to the output sampling rate for use in asynchronous sample rate conversion. An input counter counts input samples and its output is sampled at the output sampling rate by a ... | 08/19/2008 |
| 7414550 | Methods and systems for sample rate conversion and sample clock synchronization The architecture for a combined universal sample rate converter and a sample clock synchronizer is presented. The universal sample rate converter can be applied, for example, to audio samples created or mixed using any of the standard audio frequencies in the set H=... | 08/19/2008 |
| 7411531 | Methods and apparatus for asynchronous sampling of a received signal at a downsampled rate Methods and apparatus are provided for decimated interpolated clock/data recovery (ICDR) to perform asynchronous sampling of a received signal. A received signal is converted to a plurality of digital samples at a downsampled rate that is lower than a rate of the re... | 08/12/2008 |
| 7408485 | Asynchronous sampling rate converter and method for audio DAC A sample rate converter suitable for use in an audio DAC includes a first estimating circuit (32A) generating first (TR) and second (STAMPR) signals synchronized to an asynchronous clock (MCLK) and representing the period and edge arrival times, respectively,... | 08/05/2008 |
| 7406492 | Digital filter combination for interpolation A digital filter combination for interpolating primary sample values of a sampled signal using an mth-order discrete-time filter and a kth-order continuous time interpolation filter, with m≧3 and k≧2, wherein the discrete-time filter forms n secondary sample val... | 07/29/2008 |
| 7403963 | Re-sampling with an arbitrary scaling ratio A simple to implement sample rate conversion system consisting of an input/output data flow controller, interpolation coefficient generation, and output data flow control to generate the converted data stream. Sample rate conversion may be done at real time video ra... | 07/22/2008 |
| 7403962 | Interpolation filter design and application A method for designing an interpolation filter begins by partitioning interpolation filtering into a plurality of interpolation filtering stages that are cascaded together. Each of the plurality of interpolation filtering stages includes an up sampling stage and a f... | 07/22/2008 |
| 7378996 | Sampling rate conversion calculating apparatus There provided is a low-cost, high performance sampling rate conversion calculating apparatus which achieves both a low delay characteristic required for conversational voice data and high quality required for audio data in a concurrent manner. A first digital signa... | 05/27/2008 |
