Document 
Document Title 
WO/1998/038582A1 
A digital signal processor (100) that is used for echo cancellation computations is disclosed, which includes parallel multiplier/adders (102/104 and 106/108), an input signal sample memory (120), and a plurality of accumulators (112, 11...

WO1998026610A3 

WO/1998/037542A1 
A method and apparatus for removing convolution noise from a signal such as one carrying speech information. The signal is transformed into a logspectral domain where a smoothed model is fitted to the logspectrum subject to constraints...

WO/1998/035439A1 
A desired programmable complex analog bandpass filter (10) is replaced by a 'black box' that receives an analog continuoustime signal and delivers an analog continuoustime signal, just as the analog filter would, but internally realize...

WO1998025342A3 

WO/1998/034346A1 
A signal processor which can be configured to perform interpolation or decimation of an analog input signal, using a combination of continuousvalued discretetime sampling together with digital filter coefficients. In its preferred embo...

WO/1998/032223A2 
An improved digital signal mixing architecture (100) for applications such as digital mixing consoles (76) is provided. The architecture provides a software configurable mixing system that is expanded up to more than 48 channels. The arc...

WO1998015083A3 

WO1998012810A3 

WO1998019396A3 

WO/1998/026609A2 
A programmable versatile digital signal processing system architecture (Fig. 5) allows the implementation of functions for transmitting and receiving a variety of narrow and wideband communication signaling schemes. The flexibility of t...

WO/1998/026610A2 
A programmable versatile digital signal processing system architecture (FIG. 5) allows the implementation of functions for transmitting and receiving a variety of narrow and wideband communication signaling schemes. The flexibility of t...

WO/1998/025341A1 
A filter circuit for a biaxial signal, etc. which has an excellent sharp filtering characteristic in a narrow band, without performing conversion/inverse conversion from a coordinate system at rest to a rotatory coordinate system. Input ...

WO/1998/025343A2 
A digital finite impulse response (FIR) filter having a shift register for receiving a digital signal, a counter for counting pulses in a sampling signal and a lookup table readonly memory (ROM) having address inputs coupled to the out...

WO/1998/025342A2 
The invention relates to a decimation method and a decimation filter, which provide the transfer function of a CIC decimation filter. Decimation of the number of order N is performed by coefficient M, whereby FIR filtering is carried out...

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 integratorcomb (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 shortdelay postfilter (13) for postfiltering an encoded or decoded audio signal, specifically a speech signal, the shortdelay 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 downsampling 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 TomlinsonHarashima ...

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 readonly memory (ROM). The FIR filter table stores a precalculated 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 preequalizer (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 oddlystacked criticallysampled singlesideband analysis/synthesis filter banks is achieved by application of a set of functions to timedomain and frequencydomain 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 timevarying 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 cellulartelephonesystem basestation receiver's channelizer (111), frequency translation of the outputs of a filter bank (fig. 5) implemented in fastFouriertransform 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 
Cochannel interference of a frequency modulated signal represented by complex signal samples is reduced by amplitude limiting each sample and nonlinearly filtering the limited samples. The nonlinear filter low pass filters the limited...

WO/1997/019541A1 
A logpolar digital filter for processing a digitized logpolar signal that is a magnitude signal (rin) and an angle signal (PHIin), has a first converter for converting the logpolar 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 
Cochannel interference in baseband digital samples of an FM communications (e.g. AMPS) signal is cancelled by a complex signal limiter and nonlinear filter (CLNF) (16), to which the samples are supplied, and a timevarying null filter ...
