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WO/2002/093181A1 |
A waveform detector having a signal processing function for producing an output waveform by detecting, by characterizing, a transient state variation having no periodic repetition or by subjecting an input waveform to 1/f fluctuation con...
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WO/2002/091588A1 |
A sub-band adaptive differential pulse code modulation/encoding apparatus includes means (102, 103, 104, 105) having a predetermined asymmetric impulse response for receiving an audio signal and band-dividing the received audio signal in...
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WO/2002/091222A1 |
A method, apparatus, and computer program product for combining a subband decomposition and a linear signal processing filter (LSPF). Operations performed include merging the LSPF, via superposition, with each synthesis filter of the fir...
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WO/2002/091219A1 |
A method, apparatus, and a computer program product for generating a set of jointly optimized linear signal processing filters and subband filters for processing digital data on a computer system are presented. In general, the invention ...
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WO/2002/089334A1 |
A filter system (10) and method are provided that is particular applicable to the resampling of a signal, such as a digital audio signal. The filtering method in accordance with the invention may use as a nearest neighbor strategy to red...
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WO/2002/089116A1 |
An inverse filtering method, comprising: generating a first filtered signal based on an input signal; and combining the first filtered signal with the input signal for obtaining a residual signal. The generating comprises: generating a s...
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WO/2002/089061A2 |
Embodiments of a two-dimensional pyramid filter architecture are described.
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WO/2002/086755A1 |
The present invention is directed to a method of providing signal processing operations, including convolution/filtering, where each parallel stream is processing signals at a lower rate than the signal data rate itself while resulting i...
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WO/2002/084234A1 |
The apparatus is an asynchronous data logger (ADL) comprises a sensor (1) and, in a preferred embodiment, three sampling channels. Each channel comprises an analogue to digital (A/D) converter (3), a sampling clock (4), a memory (5) and ...
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WO/2002/082106A1 |
The invention concerns a device and a method for analysing a digital audio signal (C) for use for identifying musical notes present in a sound, audio or musical signal. The invention is characterised in that the method consists in: creat...
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WO/2002/080362A1 |
The present invention proposes a new method and apparatus for the improvement of digital filterbanks, by a complex extension of cosine modulated digital filterbanks. The invention employs complex-exponential modulation of a low-pass prot...
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WO/2002/080098A2 |
Embodiments of a pyramid are described.
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WO/2002/078182A2 |
This invention relates to an integrated circuit comprising a two-dimensional pyramid filter architecture of order 2N-1, where N is a positive integer greater than two. With this architecture reduction of computational complexity or proce...
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WO/2002/078183A1 |
A filter (201) accepts a diffusion code sequence or the like as an input sequence at the chip late 1/D. The diffusion code sequences accepted are successively delayed by a delay circuit (202) connected in series, and delivered. Delay tim...
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WO/2002/076055A1 |
An interface circuit (103) is integrated in an LSI. A comparator circuit (105) having a hysteresis characteristic compares the signal (111) outputted from a driver circuit (101) through a signal transmission line (102) with a signal (112...
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WO/2002/073615A1 |
When data from an optical recording medium is demodulated, the data demodulation rate is variable in accordance with a reproduction state. Thus, it is possible to maintain a preferable read performance and reduce power consumption. As me...
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WO/2002/071620A1 |
While a digital input is oversampled up to eight times to process and the oversample data into a specified digital fundamental waveform with multipliers/adders (4-10) to carry out only folding operation with delay circuits 11¿-1?-11¿-4...
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WO/2002/071256A1 |
A method for finding optimal filter coefficients includes selecting a wavelet basis k parameters (102). The waveleet basis is reparameterized into k/2 rotation parameters (108) and factorized into a product of rotation and delay matrices...
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WO/2002/069491A1 |
A method for measuring system clock signal frequency variations is disclosed, whereby the number of search operations can be limited to 2log n, where n is the number of elements (signal values) within the sliding window used. A binary tr...
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WO/2002/069492A2 |
A highly-programmable Finite Impulse Response (FIR) digital filter overcomes the limitations of conventional configurations. Specifically, a compound FIR filter configuration is provided, offering the advantages of heightened programmabi...
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WO/2002/063764A1 |
A digital FIR filter is provided that inputs a series of data samples x[0]x[n] and generates a partial sum output PS[i] where i$m(F)n. The partial sum output is a weighted version of the difference between a partial sum of the previous i...
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WO/2002/060261A2 |
An electronic filter operates as a correlator that provides a discrete approximation of an analog signal (Figure 1, 10, 11, 12, 13). The analog to digital conversion is integrated directly approximation calculation. An array of sample an...
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WO/2002/060056A2 |
The present invention comprises a method of obtaining coefficients for a transmit filter such that the power spectral density of the output for the different frequencies comes close to but does not exceed a maximum power spectral density...
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WO/2002/060114A2 |
A multi−carrier filter for a wireless communications system employing a multi−carrier signal. The multi−carrier filter includes a first mechanism for receiving the multi−carrier signal and extracting carrier signal components A s...
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WO/2002/058244A1 |
Data to be compressed is differentiated for respective sampling points (S1-S20) and their absolute values are sequentially added to obtain differential total data (D1-D20). Then sampling points, where when data between two sampling point...
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WO/2002/056468A2 |
The present invention is directed to efficient and accurate filtering and interpolation techniques. Methods of the present invention reduce the number of required operations and reduce computational errors in the filtering and interpolat...
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WO/2002/054350A2 |
A multiplierless pyramid filter is described comprising a sequence of scalable cascaded units, each of said units comprising a delay unit and three the adders, said delay unit the adders being coupled to produce a higher order pyramidall...
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WO/2002/051083A1 |
An IQ modulator and method for modulating a signal in accordance with I and Q symbols using derivative FIR's operating at the symbol rate and programmable multi-accumulators for waveform generator.This provides advantages that reduced co...
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WO/2002/051003A2 |
A method and device are described for generating two output signals (I; Q) each substantially identical to a square-wave input signal (A) from a local oscillator (2), wherein the first output signal (I) may have a certain time shift with...
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WO/2002/048904A1 |
An FIR decimation filter includes the a shift register (51) having M flip-flops arranged in M/R rows (52, 54, 56, 58) of R bits. Each row has a left tap and a right tap. The rows are grouped into upper half and lower half sections. The s...
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WO/2002/047262A2 |
A filtering method is proposed wherein first several filtering steps (I-III,IV-VI) are made. Each step (I-III,IV-VI) includes: generating a filtered signal (I,IV), rounding this filtered signal (II,V) to a certain accuracy and combining ...
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WO/2002/047296A1 |
An analog filter comprises first and second arithmetic operation sections (2¿-1?, 2¿-2?) connected in series and each composed of processing circuits connetected in series. Each processing circuit includes an S/H circuit of plural stag...
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WO/2002/047258A2 |
A filter (26) is used to average power values of a signal that has been subjected to varying gain. The gain is factorised into two factors, the first being the highest power of 2 within the gain, and the second being a factor which can b...
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WO/2002/041490A2 |
A system for digital filtering includes a set of logic gates, a state storage, and a multiplexer. The state storage includes two or more storage banks and may also include combinatorial logic and/or at least one lookup table. In one appl...
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WO/2002/039727A2 |
The invention relates to a method and apparatus for detecting asymmetry in transient signals and to a method and apparatus for correcting such asymmetry. In the apparatus for detecting asymmetry there is provided a pre-shoot filter (1) f...
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WO/2002/037675A1 |
The invention relates to a filtering method and a filter implementing the filtering method. In the solution, a signal is filtered by at least one real FIR filter (22) having at least one stop frequency pair whose different frequencies ar...
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WO/2002/031977A1 |
The invention concerns a finite impulse response filtering device having a transfer function comprising P coefficients, designated c¿q?, wherein P$m(G)1 is a predetermined integer. The invention is characterised in that in such a device...
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WO/2002/025476A1 |
An analog FIR filter (500) that processes multiple output samples in parallel is disclosed. The simultaneous parallel processing of multiple samples permits improved sampling rate and improved accuracy as compared to prior art filters.
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WO/2002/023721A1 |
A digital low pass filter of the FIR type stores the input signal into register means with a plurality of taps. These taps are connected to address a look up table and the filtered output signal is derived from the output of the look up ...
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WO/2002/021688A1 |
The invention relates to a method and to a device for converting a first scanning frequency (f¿A?) of a digitized analog signal to one or more scanning frequencies (f¿B?, f¿C?, f¿D?). The invention is further characterized in that th...
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WO/2002/019150A1 |
The invention pertains to systems that sample a continuous analog time-domain signal. The invention is particularly applicable to systems whose analog components have a bandwidth limit below that desired or specified. The invention has b...
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WO/2002/017486A1 |
A method for long impulse response digital filtering of an input data stream, by use of a digital filtering system. Where the input data stream is divided into zero-input signals and zero-state signals. One of the zero-input signals and ...
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WO/2002/017488A1 |
The partitioned block frequency domain adaptive filter according to the invention comprises a plurality of parallel arranged filter partitions. Each filter partition models a part of an impulse response of the adaptive filter and has upd...
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WO/2002/009582A2 |
A method and apparatus for implementing a signal morphology preservation smoothing scheme. The smoothing scheme includes generating an output signal representative of a filtered version of the input signal, wherein the output signal is g...
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WO/2002/009091A1 |
A device and a method for compressing signal information by removing (thinning out) the signal component of a signal in a specific frequency band. Firstly an input time-series signal (e.g., a PCM signal) is converted by an analyzer (11) ...
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WO/2002/003382A1 |
A method for the conversion of LSF to LPC coefficients (Line Spectral Frequencies to Linear Prediction Coefficients) to avoid excessive growth of intermediate coefficients during calculation of polynomial products. The symmetric and anti...
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WO/2002/003550A1 |
The invention relates to an interpolation filter and to a method for filtering a digital input signal. The interpolation filter has an amplitude characteristic with a low-pass-shaped damping curve in the useful signal frequency range of ...
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WO/2001/099277A1 |
A method for conversion of input audio frequency data, at an input sample frequency, to output audio frequency data, at an output sample frequency. The input data is subjected to expansion to produce expanded data at an output sample fre...
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WO/2001/099279A1 |
A signal peak reduction circuit (10), comprising: a band-limiting filter (13) for limiting the bandwidth of a data bearing signal, a predictive filter (12) for predicting peaks in the data bearing signal at the output of the pulse-shapin...
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WO/2001/097376A1 |
The invention relates to a digital comb filter, which comprises n filter stages, whereby each filter stage has a retaining member located at the input of the filter stage. Said retaining member doubles the sampling rate by outputting eac...
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