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Patent Searching and Data


Matches 1,001 - 1,050 out of 13,092

Document Document Title
WO/1997/002675A2
A CDMA modem includes a modem transmitter having: a code generator which provides an associated pilot code signal and which generates a plurality of message code signals; a spreading circuit which produces a spread-spectrum message signa...  
WO/1997/002714A2
A multiple access, spread-spectrum communication system processes a plurality of information signals received by a Radio Carrier Station (RCS) over telecommunication lines for simultaneous transmission over a radio frequency (RF) channel...  
WO/1997/002665A2
An automatic power control (APC) system for a spread-spectrum communications system includes an automatic forward power control (AFPC) system, and an automatic reverse power control (ARPC) system. In the AFPC, each subscriber unit (SU) m...  
WO/1996/037953A1
A digital filtering method that includes sampling an input signal at a first rate, integrating the signal, sampling the integrated version at a different rate, and combining the sampled integrated version with the input signal. The metho...  
WO/1996/037963A1
A computed tomography imaging method that includes receiving an analog beam intensity signal from a computed tomography scanner and converting it into a series of digital representations at successive points in time. An indication that a...  
WO/1996/033656A1
In an ultrasound imaging system, the mean velocity of a fluid flow, variance of velocity of the fluid flow and energy value of Doppler ultrasound signals from the flow in response to transmitted ultrasound are first estimated (40) from a...  
WO1996028889A3  
WO/1996/032653A1
The invention concerns a method for the measurement of distances along a high-tension power-transmission line, the method calling for measurements of the current and voltage in the power-transmission line to be digitalized and then proce...  
WO/1996/031001A1
In a digital filter with a recursive and a non-recursive section, coefficients of the recursive and non-recursive sections can be controlled is such a way that the further filter characteristic can be controlled with a fixed zero point a...  
WO/1996/028953A1
A device for determining the quality of an output signal to be generated by a signal proceesing circuit with respect to a reference signal is provided with a first series circuit for receiving the output signal and with a second series c...  
WO/1996/028950A1
A device for determining the quality of an ouput signal to be generated by a signal processing circuit with respect to a reference signal is provided with a first series circuit for receiving the output signal and with a second series ci...  
WO/1996/028952A1
A device for determining the quality of an output signal to be generated by a signal processing circuit with respect to a reference signal is provided with a first series circuit for receiving the output signal and with a second series c...  
WO/1996/028889A2
A method and apparatus for phase locking to an input signal and outputting a sigma-delta modulated control signal. The method and apparatus of the present invention provide a sigma-delta modulated control signal which can be utilized by ...  
WO/1996/028095A1
A display processor (10) for an ultrasonic imaging system includes a two-dimensional filter (12) to generate a smoothed image signal IP from a high spatial resolution image signal ID. IP is optimized for high contrast resolution and good...  
WO/1996/027830A1
An efficient method and apparatus of median filtering includes a memory circuit (305) for holding a list of N data samples (109). A grading circuit (309, 321, 313, 311) identifies a first data sample of the N data samples that has a firs...  
WO/1996/025093A1
Systems and methods provide nonlinear, non-median filters (56) for signals derived from biological events. The systems and methods select a set of n sample values arranged with respect to time from the derived biological signal input. Th...  
WO/1996/025793A1
An active current steering semi-digital FIR filter for a digital-to-analog conversion circuit, which includes a shift register having a 1-bit digital input stream and a plurality of output taps, where each output tap provides a 1-bit sig...  
WO/1996/024127A1
This invention relates to an improved adaptive spectral estimator for estimating the spectral components in a signal containing both an information signal, such as speech and noise. The improvements relate to a noise power estimator (3) ...  
WO/1996/023353A1
A compact FIR filter uses one or both of a compact address sequencer and a compact multiplier/accumulator. The address sequencer exploits certain symmetry properties existing between different phases of a polyphase FIR filter in order to...  
WO/1996/020531A1
A method of filtering a signal conglomerate using a Datasieve having a plurality of filtering stages in cascade, at least one of the filtering stages comprising a recursive ordinal value filter. A typical arrangement comprises a sequence...  
WO/1996/013897A1
A communications device (100) employs an averaging filter (112) at the output of a demodulator circuit (110) to remove unwanted components introduced by in-channel interfering signals.  
WO/1996/013898A1
Disclosed are repetitive control systems (Fig. 2) and learning control systems (Fig. 4) using filters (24) composed of delay circuits (20) and having parameters resulting in a very high loop gain for only specific frequencies. This resul...  
WO/1996/013097A1
A hybrid filter bank analog-to-digital converter includes continuous-time analysis filters and discrete-time synthesis filters. The continuous-time analysis filters partition a continuous-time wibedand input signal into continuous-time s...  
WO/1996/002981A1
A method and apparatus are provided for echo cancelling which includes double-talk immunity. The echo canceller (15) according to the present invention includes a double-talk detector (17) which uses an adaptive double-talk detection thr...  
WO/1995/031860A1
A method and apparatus for digital-to-digital conversion using sigma-delta modulation of the temporal spacing between digital samples. The method and apparatus of the present invention provides for sigma-delta modulation of the time base...  
WO/1995/030223A1
Synthesized speech is subjected to a post filter which performs calculations based on future (20e, 24e) and past (20d, 24e) data. Frames of data (22a, 22b) are divided into subframes (20a, 20b, ... 20h) to designate points of the calcula...  
WO/1995/029449A1
The invention proposes a digital filter that can be adapted to have appropriate filtering characteristics based on the signal being filtered. The invention uses a neural network (26) to adjust coefficients of a digital filter (20, 22), d...  
WO/1995/028774A1
In an echo cancelling arrangement, an estimated echo signal is produced by an adaptive filter (18) from a receive path signal (R) and is subtracted (20) from an incoming transmit path signal (S) to produce an outgoing transmit path signa...  
WO/1995/028045A1
A physically compact, multichannel wireless communication transceiver architecture employs overlap and add or polyphase signal processing functionality, for wideband signal processing, together with a sample rate. A receiver section rece...  
WO/1995/025382A1
A system and method for cancelling noise in an analogue signal. The analogue signal is received and converted into a digital signal using an analogue to digital converter. The digitised signal is subsequently transformed into the frequen...  
WO/1995/025414A1
Apparatus and method for shifting the frequency range of an audio frequency range signal using digital frequency shifting and single sideband amplitude modulation techniques. In one embodiment, the audio signal (2) is shifted to an ultra...  
WO/1995/024768A1
A digital filter includes a pre-filter cascaded to a low pass filter. The pre-filter has a transfer function providing generally increasing attenuation with increasing frequency above a cutoff frequency. The low pass filter has a transfe...  
WO/1995/022797A1
A digital filter transfer function is implemented using at least two implementing filters (704, 708), one of which has a transfer function which guarantees an output which is unconditionally within a predefined output compliance range, a...  
WO1995017792A3  
WO/1995/020812A1
A method for designing a frequency periodic filter with a frequency response which has a periodic bandwidth including designing a first sampled data filter whose response corresponds to a set period and replacing each unit sampling delay...  
WO/1995/020841A1
An active control system for multiple interacting channels to control a constant noise or vibration consisting of first (3) and second (8) sensor means adapted to provide reference and residual signals respectively, a first and second fi...  
WO1995017708A3  
WO/1995/019676A1
A higher order phase loop filter includes an integrator consisting of an adder (25) and a delay element (31) arranged in a feedback loop between the output port of such adder and one of its input ports. Signal to be filtered is applied t...  
WO/1995/019081A1
Apparatus and method for use with a sampled input signal having an input sampling frequency Fs, including M digital filters (106-1 to 106-M), each receiving the input signal (104), each having a respective transfer characteristic hm(n) a...  
WO/1995/017792A2
During filtering of an image comprising diferent regions, the operation of a filter unit is adapted in response to the detection of a boundary between these regions. To this end, one or more intermediate signal values stored in the filte...  
WO/1995/017708A2
The invention relates to a direct-type FIR filter, a method for calculating a scalar product in a FIR filter, and a method for designing a direct-type FIR filter. Successive words of a digital input signal are delayed in a delay line hav...  
WO/1995/017784A1
The invention relates to a method for adaptation to an echolocation in an echo canceller comprising an output port, an input port, an adjustable delay unit (43) compensating for the pure delay component in the echo path between the echo ...  
WO/1995/012261A1
A physically compact, multichannel wireless communication transceiver architecture employs overlap and add or polyphase signal processing functionality, previously applied to narrowband speech analysis research, for wideband signal proce...  
WO/1995/010883A1
A decimator for effecting a X:1 decimation, where X = is any positive integer greater than 1, comprising a FIR filter for receiving and filtering an input stream of data bits and in response generating a like number of filtered output da...  
WO/1995/010831A1
A multi-channel reverberation system has a substantially constant multi-channel power gain at audio frequencies and comprises multiple signal inputs, one for each input channel, a number of comb filter networks connected to each signal i...  
WO/1995/008890A1
Circuitry and concomitant methodology for demodulating Direct-Sequence, Spread-Spectrum Code-Division Multiple-Access (DS/SS CDMA) channel signal using multiple samples per transmitted symbol and a minimum mean squared error criterion to...  
WO/1995/008867A1
A digital filter characterized by a plurality of filter coefficients, positive ones of the coefficients being represented by unsigned binary integers and negative ones of the coefficients being represented by 2's complement binary intege...  
WO/1995/008220A1
A method and apparatus for analog to digital conversion using sigma-delta modulation of the temporal spacing between digital samples. The method and apparatus of the present invention provides for sigma-delta modulation of the time base ...  
WO/1995/008221A1
A method and apparatus for digital to analog conversion using sigma-delta modulation of the temporal spacing between digital samples. The method and apparatus of the present invention provides for sigma-delta modulation of the time base ...  
WO/1995/006978A1
A ROM filter includes a number of ROMs, each of which is programmed to hold data relating to several pulse response curves during only a particular time interval. As data are read into the filter, data pertaining to a particular pulse re...  

Matches 1,001 - 1,050 out of 13,092