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WO/1994/001933A1 |
Apparatus for and methods of operation of digital filters and certain other electronic digital signal processing devices are provided to improve the accuracy and efficiency of filtering. Particularly, the apparatus and method includes a ...
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WO/1994/000821A2 |
A convolution of input data S0 and a Gabor function Galpha,omega is implemented by a processing unit (20) to obtain a wavelet coefficient Tg(20,b) of a 0th stage. The input data S0 is applied to a low-pass filter (30) and is subjected to...
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WO/1993/024995A1 |
A shift and add digital image processor (1) includes two sections (3) and (5), each including a latch (10, 22) for latching an input signal, an adder (18, 28) for summing two channels output from the latch with programmable delay (14, 26...
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WO/1993/024879A1 |
Method and apparatus for implementing a digital filter (10) employing coefficients expressed as sums of 2 to an integer power. Coefficients expressed as sums of powers of 2 may be algebrically manipulated such that higher order terms are...
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WO/1993/023814A1 |
The processing element is useful in solving problems from the class of temporal signal processing problems and is modeled closely on the sub-cellular biology and electrophysiology of neurons having chemical synapses.
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WO/1993/023924A1 |
The invention relates to a filter structure operable at a filter clock frequency f, consisting of m digital decimation filters (DF¿1? ... DF¿j? ... DF¿m?), connected in parallel on the input side, which contain a multiplexer (MUX¿1?)...
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WO/1993/022625A1 |
The invention is based on the use of the principles of Lange's Fast Kalman Filtering (FKF) for large process control, prediction or warning systems where other computing methods are either too slow or fail because of truncation errors. T...
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WO/1993/021710A1 |
Methodology, and associated circuitry, for encoding (e.g., 200) and decoding (e.g., 900) an incoming data stream (201) utilize a coordinated code constellation (e.g., Fig. 3) that effects robust signal detection in the presence of channe...
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WO/1993/019418A1 |
In a typical Viterbi demodulator implemented using the add, compare, select (ACS) method, each state in the expected sample sequence model is associated with a hardware module to perform the functions of adding new branch error metrics t...
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WO/1993/017508A1 |
A method and a system for processing digital audio signal pre-echoes. Samples x(n) are frequency transform block-coded as coefficients y(k) then transmitted as coefficients Cy(k), decoded as coefficients y'(k), and reverse frequency tran...
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WO/1993/016527A1 |
The present invention relates to a method and to an apparatus for ghost cancelling and/or equalizing. A received test signal is compared with an ideal version of this test signal. The coefficients of a correction filter applied to the re...
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WO/1993/013710A1 |
A digital phase shifter capable of shifting the phases of data row by steps shorter than the sampling period even though the sampling signal the phase of which is fixed or a clock signal is used. This phase shifter comprises: a memory fo...
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WO/1993/013711A1 |
A method and apparatus for reducing noise and enhancing the dynamic range of an image data set gather from an array (12) of transducers (T). The method includes the step of processing the image data set in a digital computer (17) by a no...
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WO/1993/014566A1 |
Apparatus for reducing the risk of undesirable drifting of the parameters, so-called bursting, of an adaptive echo filter (15), which is coupled between a receiving branch (17) and a transmitting branch (16) included in a four-wire loop....
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WO/1993/011647A1 |
A device for correcting transmission frequency characteristics, wherein when a synthesis frequency characteristic exceeds a predetermined level, the combination of parameters not exceeding the predetermined level can be known. This devic...
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WO/1993/008643A1 |
A circuit and method for compressing or generating a pulse, particularly a chirp pulse, which uses infinite impulse response filtering (3.2). The infinite impulse response filters (3.9, 3.10, 3.11, 3.12) simulate the response of finite i...
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WO/1993/008651A1 |
A process is disclosed for reducing frequency interlacing during transmission of digitized audio signals. Frequency interlacing is always to be expected when the input signal is distributed among partial bands in series connected stages....
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WO/1993/007678A1 |
Decimation circuitry is provided having a forward shifting data section (14) receiving data samples in order including a plurality of forward decimation registers (17-20) coupled in-line and providing a forward register output. Each forw...
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WO/1993/007688A1 |
A Viterbi equalizer (366) for decoding a pi/4 DQPSK modulated signal. Because symbol values of adjacent symbols of a pi/4 DQPSK signal are offset in phase relative to one another, allowable values of succeeding states of a pi/4 DQPSK sig...
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WO/1993/007712A1 |
A rate converter for digitally converting the sample rate of a signal, has a first digital filter for deriving an intermediate signal at increased sample rate and a second digital filter for deriving an output signal at a decreased sampl...
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WO/1993/005598A1 |
A first and second digital rate converter device and method provides for synchronization between a first digital sample sequence and a second digital output sequence related to the first digital sample sequence for a rate converter pair ...
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WO/1993/005573A1 |
A linear phase high pass filter having a linear phase low pass filter in parallel with an electronic delay means is disclosed to remove baseline wander from an ECG signal. The linear phase low pass filter is preferably a digital Infinite...
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WO/1993/005574A1 |
A filter system for removing small amplitude, high frequency signals such as muscle artifact signals from an ECG signal is provided. The filter system includes a low pass filter with variable cutoff frequencies, an electronic delay and a...
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WO/1993/005612A1 |
Smoothing of regenerated pictures (e.g. after a heavy signal compression and coding for transmission on a narrowband medium) can be effected by means of a so-called "cosmetics filter", which filter comprises a lowpass filter, a delay mea...
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WO/1993/004529A1 |
A procedure for filtering an incoming signal, representing a sound, in order to achieve an intended modification to the character of the sound, comprises feeding the incoming signal to a number of parallel filter branches, convolution of...
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WO/1993/002506A1 |
A pre-averager for digitally averaging the samples of an input data signal (26) over two or more symbols, the averaging interval being defined by the input sampling rate divided by the output sampling rate. As the averaged sample is cloc...
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WO/1993/002508A1 |
In oder to find the overall monitoring threshold (6) during a bit-rate-reducing source coding of digitised audio signals (1), a requantization and coding regulation for the time or spectral scanning values (2) of the audio signal is foun...
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WO/1993/000741A1 |
The method of the present invention generates an optimal adaptive filter update coefficient by first generating three error signals using a signal input and three update coefficients (301-303). Mean Square Error (MSE) values are estimate...
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WO/1992/022137A1 |
The invention relates in general to digital encoding and decoding of information. More particularly, the invention relates to efficient implementation of digital analysis and synthesis filter banks used in digital encoding and decoding. ...
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WO/1992/017803A1 |
The invention describes a programmable transversal filter for adaptive filtering of signals with a very broad passband. The signals to be filtered modulate one or more optical carriers (F1) in a modulator (mod). Each carrier is distribut...
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WO/1992/015243A1 |
A prior art device for filtering out baseline fluctuations from physiological measurement signals in the form of sampled values comprises a first low-pass filter (5) with a subsequent stage (6) for reduction of the sampling rate, a subse...
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WO/1992/016054A1 |
A signal weighting system for associating a confidence level with portions of a communication signal transmitted upon a multipath channel (44) and received by a receiver (76). A signal received by the receiver is equalized by an equalize...
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WO/1992/015151A1 |
A filter is produced having a real and an imaginary part, such that for positive frequencies the frequency characteristic F of the filter is F = A + jS. The real part A is a skew-symmetric filter and S is a real symmetric filter symmetri...
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WO/1992/015150A1 |
The invention provides a real-time (or non real-time) signal processing apparatus which enables the accurate and robust discrimination, separation and suppression (or detection) of one or more component random signals/variables which com...
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WO/1992/011696A1 |
A digital filter bank for reducing power consumption by decreasing the number of multiplications carried out therein. There is particularly proposed a filter bank for use in battery-operated applications. The digital filter bank includes...
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WO/1992/010029A1 |
Adaptive decision feedback equilizer apparatus for processing information including a data input buffer (34), a gain acquisition circuit (42), a timing acquisition circuit (40) operative to generate timing error signals, a synchronizing ...
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WO/1992/004673A1 |
Memory technologies for storing include RAMS and CCDs. Adaptive memory capability and memory servo capability improve memory characteristics. In a RAM embodiment, a detector (220B, 220A) is used to detect a memory address condition (217)...
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WO/1992/002897A1 |
An image coding apparatus and method are disclosed. The method and apparatus are applicable to coding (404) any array (402) of arbitrary dimension. The apparatus utilizes FIR filters (450, 460, 470) which generate three or more sets of c...
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WO/1991/020126A1 |
A phase shifter is implemented using varicap diodes (30) arranged in the form of a lumped element transmission line. A control unit (24) controls the reverse bias voltage of the diodes (30) to provide a delay which can be varied continuo...
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WO/1991/015995A1 |
Information collected from the primary sensor (101) and a plurality of the reference sensors (102) is compared to derive correlation data (1000). A matrix, representing correlation data in the time domain or cross-spectral density inform...
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WO/1991/016769A1 |
This invention relates in general to high-quality low bit-rate digital transform coding and decoding of information corresponding to audio signals such as music signals. More particularly, the invention relates to signal analysis/synthes...
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WO/1991/014310A1 |
Digital signal processing (DSP) apparatus comprises architectures for digital multiplexing and for digital demultiplexing. The architectures comprise a discrete Fourier transformer filter (8) and a modified Hilbert transform network (3)....
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WO/1991/012664A1 |
When a sampling rate conversion apparatus uses first and second sampling frequencies related by a simple ratio of integers, an over-sampling filter is constituted of an FIR type digital filter having a length corresponding to the least c...
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WO/1991/010955A1 |
The invention relates to an address processor for a signal processor. This address processor comprises means for address calculation in a read/write memory containing at least one circular buffer for storing state variables of digital fi...
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WO/1991/010283A1 |
The invention relates to an interpolative analog/digital converter for band-pass signals in which the amplitudes of the scanning values are quantized in 2 consecutive stages. The first stage contains the actual analog/digital interface a...
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WO/1991/009371A1 |
A finite impulse response filter that has the ability to use arbitrary TAPs that are essentially random access TAPs includes a plurality of circuits. The samples it operates on do not need to be in contiguous form. A sequencer (12) is pr...
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WO/1991/008616A1 |
A procedure to split a frequency division signal represented by digital complex sample values into two separate signals depending on frequency by using two frequency selective filters is described in detail. The procedure applies multipl...
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WO/1991/007848A1 |
An interpolation filter is used in television standards conversion to decimate an input sequence of higher definition signals into an output sequence of lower definition signals. The filter is partitioned into a plurality of computationa...
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WO/1991/003872A1 |
A balancing network of wave digital filter type consisting of three-terminal-pair conversion adaptors (21 to 26) connected in cascade each of which having a capacitor (C) and a resistor (R) as constituent elements to exhibit a filter ope...
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WO/1991/002407A1 |
A digital decision feedback equalizer is disclosed in which compensation for the post-cursors of the impulse response of the transmission channel is divided up into two regions. A first region (70) encompasses the initial rapidly changin...
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