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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...
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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...
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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...
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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...
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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 ...
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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...
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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...
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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...
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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...
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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...
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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 ...
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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 ...
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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...
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WO/1995/005034A1 |
A scrambler for use with thermometer code digital signals and having a number of interconnected identical switching cells in the form of swapper cells (20) with two inputs and two outputs. A control signal (SWAP/NO SWAP) determines wheth...
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WO/1995/002288A1 |
Properties of human audio perception are used to perform spectral and time masking to reduce perceived loudness of noise added to speech signals. A signal is divided into blocks (2), passed through notch filters (4) to remove noise compo...
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WO/1994/027787A1 |
In order to manufacture a grinding tape (11) which consists of a film substrate (2) and a grinding layer (10) laminated on one surface thereof, and which has a plurality of recesses (9) in the surface of the grinding layer (10), a film s...
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WO/1994/025960A1 |
A transmission system is described comprising at least a coder (101) for coding a signal (10a). The system furthermore comprises at least a transmitter (102), at least a receiver (103) and at least a decoder (104). At least for a coder (...
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WO/1994/025961A1 |
A transmission system is proposed comprising at least a coder (101) for coding a signal (10a). The system furthermore comprises at least a transmitter (102), at least a receiver (103) and at least a decoder (104). At least for a coder (1...
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WO/1994/023492A1 |
The invention relates to a decimation filter comprising a direct cascade arrangement of digital first order and second order integration and derivation stages (22, 23, 25, 27) and a decimation stage. The decimation filter structure of th...
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WO/1994/023493A1 |
The invention relates to a method and an arrangement in a transposed digital FIR filter for multiplying a binary input signal by tap coefficients, and to a method for designing such a filter. The invention comprises a shift register (51,...
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WO/1994/023427A1 |
A filter for compensating discrete secondary pulse formations associated with a data stream of discrete main pulses produced from data read from magnetic media. The filter's impulse response comprises a center coefficient with side compe...
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WO/1994/022230A1 |
In a circuit is disclosed for deriving a signal indicating interference in a received stereo multiplex signal in which the stereo multiplex signal is in the form of a digital signal with a first scanning rate which is substantially great...
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WO/1994/022265A1 |
A bandpass enhancement filter (10) has a pass-band that tracks changes in spatial frequency due to the use of a zooming process upon a digital image signal. The primary pass-band of the enhancement filter is derived from a combination of...
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WO/1994/022219A1 |
In a digital filter which can be switched between a first and a second characteristic, where signals to be filtered can be transmitted from an input (1) via an adder (3) to an output (5) and the signals at the output can be returned to t...
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WO/1994/022218A1 |
When input data are received at a rate of fSL, (M-N) pieces of 0 data are inserted every N pieces of the input data by an interpolation processing circuit (20) to generate data at a rate of fSH, and M coefficient generators (30A) to (30D...
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WO/1994/022229A1 |
In a circuit for deriving audio signal masking signals in a radio receiver, a signal which is substantially proportional to the intensity of the reception field is transmitted through a low pass filter then weighted with a predetermined ...
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WO/1994/022227A1 |
In a circuit for deriving a signal indicating interference in a received stereo multiplex signal, in which the stereo multiplex signal is in the form of a digital signal with a first scanning rate which is substantially greater than twic...
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WO/1994/022226A1 |
In a circuit for deriving a signal dependent on the direction of change of the reception field intensity in a radio receiver controllable by a microcomputer, outside the microcomputer there is a comparator to which the signal representin...
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WO/1994/022228A1 |
In a circuit for deriving a quality signal dependent on the quality of a received multiplex signal in a stereo radio receiver. The multiplex signal contains a sum signal (L+R) in the base band, an auxiliary carrier modulated with a diffe...
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WO/1994/022231A1 |
In a radio receiver with digital signal processing, a first and a second auxiliary signal are derived from a received stereo multiplex signal. The first auxiliary signal depends on the presence of signal components, the frequency of whic...
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WO/1994/022232A1 |
In a radio receiver with digital signal processing, a received stereo multiplex signal and digitalized useful signals derived therefrom are processed at a first scanning rate. Auxiliary signals at least partially derived from the stereo ...
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WO/1994/021041A1 |
A method for filtering a time signal (e(t)) sampled in blocks of N samples (e(n),e(k)) by a transfer function defined in the frequency domain by LN samples (H(K)), wherein the transfer function is filtered by a time window (g1) of width ...
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WO/1994/021061A1 |
An apparatus is provided for use in a multi-channel digital transmitter and receiver. A filtering process is accomplished by conditioning portions of a digitized signal during digital signal processing by integrating, taking the differen...
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WO/1994/019869A1 |
A digital resampling system (300) is provided for converting a first digital signal to a second digital signal, having two different sampling clock rates and not phase-locked together. A filter (302) is clocked by the first clock (H) and...
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WO/1994/019790A1 |
Analysis by synthesis calculates a difference by subtracting (130) synthesized speech from input speech. The synthesized speech is formed by exciting long and short term filters (124, 126) with excitation vectors from a codebook store (1...
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WO/1994/017762A1 |
This invention relates to an improved method of on-line system identification for use with active control systems. The method requires less computation and reduces the problem of coefficient jitter in the filters (12, 22) of the active c...
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WO/1994/016499A2 |
A datasieve typically used for a method of pulse analysis applied to a signal conglomerate to remove unwanted signals, for example to enable the output to be used for object identification in an image analyser, wherein the datasieve incl...
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WO/1994/015427A1 |
An apparatus is provided for maximum likelihood sequence estimation. The apparatus includes a first maximum likelihood sequence estimator (44) in a signal path for flat fading and an at least second maximum likelihood sequence estimator ...
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WO/1994/010760A1 |
Described is an echo compensation device with a digital transversal filter for an information transmission equipment as well as 4/2-wire interface with at least one such device. The invention provides a scale-value device which analyzes ...
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WO/1994/010772A1 |
A method and means are provided of transmultiplexing a plurality of signals between a plurality of signal terminals (17 or 29) and a plurality of selected radio frequency channels. The method includes the step of, and means for, frequenc...
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WO/1994/009382A1 |
A radar system including a Kalman filter that processes radar return signals to produce position, velocity, acceleration, gain and residual error output signals, and a post-processor that processes these signals in accordance with a trac...
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WO/1994/008511A1 |
Method and apparatus for analysis of electrocardiographic signals from a subject undergoing a stress test with signal pickup (6, 11-13) providing inputs to a computer (19) programmed to perform a bidirectional infinite impulse response f...
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WO/1994/009564A1 |
An apparatus and method for filtering intersymbol interference from an information signal generated from a storage medium. This apparatus utilizes a delay line (50), gain devices (51) summing devices (52), and has specified transfer func...
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WO/1994/008395A1 |
An asynchronous digital sample rate converter includes a random access memory (110) for storing input data values and a read only memory (104) for storing a reduced set of interpolation filter coefficients. Input data is written to the r...
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WO/1994/007303A1 |
A method and system by which the number of samples used to characterize the noise cycle of an active noise cancellation system varies dynamically as a function of the fundamental operating frequency of the system.
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WO/1994/007308A1 |
An adaptive filter for the approximation of a read-in set function F in a function space, containing a set of n elementary filters gb, n being an integer 1. The elementary filters cover a sub-space in the function space, the parameters o...
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WO/1994/007208A2 |
A single integrated circuit device is disclosed that is capable of selectively functioning in real time as either a sequential matrix multiplier, a parallel matrix multiplier, a convolver or a FIR filter in order to process image data. A...
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WO/1994/007212A1 |
A filter system with low throughput delay having at least two parallel filters, either sampled-data or continuous, wherein one of the filters has a low throughput delay in comparison with the other filters.
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WO/1994/006233A1 |
A combined equalizer and roll-off filter is formed from a fractional transversal equalizer, certain of the tap weights of which are fixed, while the remainder are variable. In particular, those taps which are at integral multiples of the...
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WO/1994/005089A1 |
A novel bandpass decimator for communication receivers and efficient implementation in VLSI. The bandpass decimator can serve as a decimation filter (303I and 304I) for alternately receiving different protocols. The decimator\'s characte...
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