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Patent Searching and Data


Matches 951 - 1,000 out of 13,092

Document Document Title
WO/1998/023029A1
A reduced power FIR filter may be utilized as the digital decimation filter for a delta sigma ADC. The FIR filter utilizes a serial bit stream which is part of the control path of the filter. Thus, operations of the circuitry which compr...  
WO/1998/023030A1
A signal processing system and method for stabilizing cascaded integrator-comb (CIC) interpolation filters. The signal processing system includes an overflow detection circuit and reset circuitry. The overflow detection circuit monitors ...  
WO/1998/019396A2
A filter device for changing a sample rate of a discrete representation, e.g. to change a size of an image signal (I), comprises a plurality of multipliers (Mi), summing circuitry (Ai) coupled to outputs of the multipliers (Mi), and a pl...  
WO/1998/019298A1
A short-delay postfilter (13) for postfiltering an encoded or decoded audio signal, specifically a speech signal, the short-delay postfilter having a transfer function $i(F(z)) of the form $i(F(z)) = $i(D(z)/E(z)), where $i(E(z)) and $i(...  
WO/1998/016007A1
A reduced hardware complexity, reduced computational intensity finite impulse response filter architecture for filtering multiple (quadrature) channels of an RF modem comprises a cascaded arrangement of L data register stages through whi...  
WO/1998/015083A2
A base station in a radio communication system uses complex bandpass filters ($g(V)�1?, $g(V)�2?, ..., $g(V)�N?) and down-sampling to channelize a wideband signal containing many channels or channel groups.  
WO/1998/013933A1
A decimation device has a sampler, a memory and an adder in the decimation stage. The sampler and the adder form a partial sample for storage in the memory at a sample time. At a next sample time the sum of a current sample and the parti...  
WO/1998/012810A2
A Method and apparatus for improved interference rejection, where the rejection is being accomplished by an IIR filter at the transmitter with complementary characteristics to an FIR filter of the receiver, such as a Tomlinson-Harashima ...  
WO/1998/009477A1
A signal correcting device (12) which can easily, quickly, and surely correct the characteristics of a transmission system, such as the loudspeaker, etc., having nonlinearity. The signal correcting device (12) supplies input signals (u) ...  
WO/1998/008313A1
A spread spectrum matched filter for use with a spread spectrum receiver comprising a first plurality of shift registers (131), a second plurality of shift registers (132), a control processor (138), a multiplexer (133), a plurality of d...  
WO/1998/007101A1
A coupled mode digital filter which simulates any number of arbitrarily tuned modes coupled together so as to share the same loss element at a junction loaded by an arbitrary impedance function is formed from the combination of one first...  
WO/1997/050173A1
An efficient, multichannel filter for CDMA modems permits multiple serial, digital bit streams to be filtered by digital signal processing techniques including sample weighting and summing functions. Each individual channel may have cust...  
WO/1997/050174A1
The finite impulse response (FIR) filter (20) is implemented as a table (104) using read-only memory (ROM). The FIR filter table stores a pre-calculated output filter value for each permissible combination of input values (102) to be fil...  
WO/1997/049179A1
For a digital circuit arrangement for influencing the frequency response of a digital audio signal as a function of frequency and/or amplitude, the input signal of the circuit arrangement is applied to a signal filter (3) having variable...  
WO/1997/049216A1
An improved coding system (fig. 1) for digital compression applicable as a digital compression algorithm for increasing the bandwidth of telecommunications and broadcasting network. The system operates in the transmission regime, not in ...  
WO/1997/047084A1
A method and apparatus for performing bandedge equalization. Specifically, the apparatus contains a pre-equalizer (300, 302) for adjusting the amplitudes of the bandedges of a broadband signal in response to a control signal. A bandedge ...  
WO/1997/045998A2
A novel finite impulse response filter apparatus and method are disclosed. A multiplexed data stream composed of two or more data streams is provided as an input to a tapped delay line. Weight and sum operators are connected to the even ...  
WO/1997/042742A2
A transmitter is disclosed for transmitting a digital information signal having a specific first sampling frequency (fs1) via a transmission medium. The digital information signal is lowpass filtered (10) and down sampled (12) so as to o...  
WO1997033369A3
In a signal converter, an input signal is combined with a feedback signal in a subtracter (10). Samples of the combined signal are mapped onto a larger number of output samples by a mapper (20). According to the present invention a singl...  
WO/1997/039526A1
A filter apparatus (1) has a digital FIR filter (8) divided into two or more sections (6, 12) with means (18, 20, 22, 24, 26, 40) for varying the filter function of each section (6, 12). The filter (1) has an input switch means (2, 4) an...  
WO1997032402A3  
WO/1997/035386A1
An efficient implementation of oddly-stacked critically-sampled single-sideband analysis/synthesis filter banks is achieved by application of a set of functions to time-domain and frequency-domain values before and after transformation. ...  
WO/1997/033369A2
In a signal converter, an input signal is combined with a feedback signal in a subtracter (10). Samples of the combined signal are mapped onto a larger number of output samples by a mapper (20). According to the present invention a singl...  
WO/1997/032397A1
A digital filter is arranged to filter samples representing an audio signal. Filtering includes an input (501), an output (516), a delay device (514), gain devices (504, 509) and feed back path. A filter is arranged such that a character...  
WO/1997/032402A2
The invention offers the opportunity to build time-varying filter banks by gluing together stationary filter banks. This glue process can be arranged in such a manner that in an encoding environment a minimum overhead needs to be transmi...  
WO/1997/028610A1
In a cellular-telephone-system base-station receiver's channelizer (111), frequency translation of the outputs of a filter bank (fig. 5) implemented in fast-Fourier-transform circuitry (453, 455, 460) is achieved by rotating the correspo...  
WO/1997/028453A1
The invention concerns a method of detecting an abrupt variation in an electrical alternating quantity, wherein a criterion for the occurence of the abrupt variation is formed from the sampled values of the alternating quantity. In order...  
WO/1997/024805A1
An extended coefficient resolution range is provided in an adaptive filter arrangement by utilizing several filters, in combination, to represent the extended resolution range. The coefficients of a first filter represents a high portion...  
WO/1997/023970A1
Using digital signal processing in a modem attached to a digital line, the modem sample rate for both transmit and receive signals is interpolated or decimated to the time slot rate of a digital channel connected to the modem by filters ...  
WO/1997/022942A1
An improved signal processing method in a signal processor for performing the deconvolution of a signal resulting from an analytical separation process is disclosed. In a first aspect, a signal representing a plurality of partially separ...  
WO/1997/022061A1
Gain correction for a digital filter is accomplished by using: a multiplier (24b) for multiplying each data value by a coefficient representing the impulse response of the filter to form a convolution of the data values; and an accumulat...  
WO/1997/020397A1
Co-channel interference of a frequency modulated signal represented by complex signal samples is reduced by amplitude limiting each sample and non-linearly filtering the limited samples. The non-linear filter low pass filters the limited...  
WO/1997/019541A1
A log-polar digital filter for processing a digitized log-polar signal that is a magnitude signal (rin) and an angle signal (PHIin), has a first converter for converting the log-polar signal into a converted linear Cartesian signal that ...  
WO/1997/017758A1
The invention calls for two multiplication units (M1i, M2i) to be included in each coefficient block (KBi) of n coefficient blocks, the multiplication units being used several times if the internal rate of the filter (F) is several times...  
WO/1997/014227A1
Co-channel interference in baseband digital samples of an FM communications (e.g. AMPS) signal is cancelled by a complex signal limiter and non-linear filter (CLNF) (16), to which the samples are supplied, and a time-varying null filter ...  
WO/1997/013325A1
A digital oversampling noise-shaping system includes a digital noise-shaped clock signal generating circuit, including a digitally controlled oscillator (DCO) operating at a fixed master clock rate, that receives a digital input sample c...  
WO1997002675A3  
WO/1997/011527A1
In source coding use can be made of switching filter banks in order to adapt the filter bank to properties of the signal to be coded. If it is not allowed that the switching introduces transient phenomena in the reconstructed signal, so-...  
WO1997004525A3  
WO/1997/009790A1
A decimating PRML signal processor system (10) for processing a PRML data signal includes: an adaptive filter circuit (22) for receiving and for shaping the data signal; a gain control circuit (30), responsive to the adaptive filter circ...  
WO/1997/009780A1
In a digital filter in which coefficients are realised using power of two weighting factors, it can occur that due to rounding errors the output signal shows some inaccuracies. By decomposing the filter coefficients into powers of two in...  
WO/1997/009781A1
The invention concerns a decision feedback filter device comprising a direct filter (FF) and a feedback filter (FB) for producing corresponding decisions (d(n)) from input symbols (x(n)), the direct filter (FF) receiving the input symbol...  
WO/1997/008827A1
A FIR interpolator which uses a zero order hold to add samples in-between original samples of a digital input stream. The use of zero order hold with a FIR interpolator reduces output harmonics as compared to the use of conventional zero...  
WO/1997/008611A1
A method and system for an IIR filter are provided. A sequence of input signals is converted to a first sequence of log signals, while a sequence of feedback signals is converted to a second sequence of log signals (458). IIR filtering c...  
WO/1997/008606A1
A method and system for an FIR filter are provided. A sequence of input signal is converted to a corresponding sequence of log signals (408). FIR filtering coefficients are then added to each log signal to generate a plurality of term si...  
WO/1997/006483A1
A fast and efficient median search method and filter searches a dynamically changing time-ordered list of data samples for a data sample representing the arithmetic median of the list. Embodiments include a method to reduce the number of...  
WO1997002665A3  
WO/1997/005748A1
A system for filtering an image during data compression using a standard JPEG compression/decompression chip typically requires a separate spatial filter external to the chip. The spatial filter is composed of numerous shift registers, f...  
WO1997002714A3  
WO/1997/004525A2
A wireless digital communication device is proposed having a pulse shaping network for pulse shaping digital signals before modulation. The pulse shaping network comprises a shift register to which data to be modulated are fed. Outputs o...  

Matches 951 - 1,000 out of 13,092