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JP4838030B2 |
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JP4838206B2 |
A filter circuit removes noise from digital data which is successively input in synchronism with a sampling clock signal. The filter circuit serves to filter the digital data by calculating the average value of every two of the current, ...
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JP4834166B2 |
A low power programmable digital filter (10) adapted for use with a telecommunications system transceiver. The digital filter (10) includes a first finite impulse response filter section for receiving an input signal and having a first t...
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JP4838892B2 |
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JP2011250087A |
To provide a technology for setting a filter coefficient so that reduction of a delay amount of a digital filter and deterioration of a radio characteristic are balanced.In an FIR-type digital filter constituted of the prescribed number ...
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JP2011249970A |
To provide a delay circuit capable of applying delay with high accuracy to an input signal and a control method thereof.A delay circuit is provided with an edge detection circuit 1004 to detect transition time of rising or falling of an ...
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JP2011244238A |
To provide a simple and inexpensive digital filter that can certainly remove noise.A digital filter comprises first and second synchronous type D flip-flop sections 1 and 2, and control logic sections 3 and 4. The first synchronous type ...
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JP4823507B2 |
A wideband random signal is decomposed into respective frequency bands, the ratio of the highest to the lowest frequency within each band being in the ratio of approximately 3:1. The wideband signal, or a re-constituted wideband signal f...
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JP4822910B2 |
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JP4812685B2 |
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JP4801775B2 |
The present invention has its object to enhance the accuracy of calculation of a tap coefficient in an equalizer, thereby improving the reception characteristic. For this purpose, a channel estimation value of each path timing is determi...
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JP2011205170A |
To generate coefficients of a digital filter to be a response obtained by performing designated time shifting of a response of an object filter.This filter generating device includes: a convolution unit for generating a delay impulse res...
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JP4779820B2 |
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JP4780904B2 |
A transceiver of a communication system is disclosed. The transceiver is implemented by a demodulation apparatus including a front-end receiver, a noise canceller, a feedforward equalizer (FFE) and a decoding system. The front-end receiv...
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JP2011188357A |
To provide a digital filter in which high-speed, high-accuracy and real-time filter processing can be obtained, by introducing and setting as a variable a value relating to the correlation of an error signal, an input signal and an outpu...
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JP4776070B2 |
Adaptive comb filter circuitry is responsive to chrominance vector absolute values to inhibit hanging dots. Chrominance vector absolute values are calculated by delaying (31) bandpass filtered video signal to concurrently provide a plura...
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JP4778007B2 |
Apparatus, and an associated method, for the receive part of a receiving station, such as a mobile station or other transceiver of a cellular communication system. Selection is made of filter characteristics to be exhibited by an adaptiv...
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JP4770440B2 |
A signal processing apparatus includes a plurality of equalizer each used for a corresponding frequency band, controller for setting a gain value in each of the plurality of equalizer, and signal processor for processing an input signal ...
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JP2011176829A |
To provide a method and apparatus for reducing aliasing between neighboring subbands in cascaded filter banks.An alias reduction filter bank filters and adds signals from a set of M2 subbands from M1 subbands of the first stage analysis ...
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JP4769323B2 |
If K=4N, wherein K is a number of subbands and N is a decimation ratio, an analysis filter process unit 21 is used to perform an analysis filter process for every N samples of real-valued input data and output K samples of real-valued da...
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JP4756083B2 |
The invention provides a spread spectrum communication system for maintaining an initial transmit power level of a communication station during periods of inactivity. The system comprises a first station (501) and a second station (502),...
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JP4754941B2 |
A linearity corrector is provided that reduces distortion in a signal processing system, such as an ADC. The linearity corrector provides a first order signal path having distortion components connected to an adder, and a filter product ...
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JP4751945B2 |
The invention provides a spread spectrum communication system for maintaining an initial transmit power level of a communication station during periods of inactivity. The system comprises a first station (501) and a second station (502),...
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JP4749096B2 |
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JP4745032B2 |
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JP4743943B2 |
A digital VSB modulator (200) includes a modulator to which an ongoing sampled data stream of 1-sample-per-symbol successive PCM symbol signal samples are applied as a modulating signal. A sampled carrier stream (302), occurring at the r...
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JP4739226B2 |
An active noise control apparatus for reducing noise from a noise source includes a microphone for detecting noise produced by the noise source, and a generalized finite impulse response (FIR) filter for receiving noise signals of the de...
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JP2011147009A |
To provide a digital filter or the like capable of reducing the number of times of arithmetic operation less than that in the prior arts.The digital filter includes: an arithmetic processing means for performing filtering processing usin...
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JP4734127B2 |
An echo prevention circuit comprises a first and second FIR filters into which a first input signal is input through an input terminal; an input/output terminal to which an output signal of the first FIR filter is output and the output s...
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JP4734126B2 |
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JP4735268B2 |
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JP4726875B2 |
A method of processing a series of input audio signals representing a series of virtual audio sound sources placed at predetermined positions around a listener to produce a reduced set of audio output signals for playback over speaker de...
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JP4729553B2 |
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JP4729685B2 |
A circuit arrangement and method utilize a programmable shifter coupled downstream of a multiplier to shift the product of an input value and a pre-scaled filter coefficient that implements a predetermined filter function. Through the ju...
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JP4722266B2 |
when changing the number of oversamples is performed, tap factors selected by selectors, which respectively correspond to holding parts in a shift register, are changed back to a predetermined number of tap factors used before the changi...
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JP4723030B2 |
A digital trigger circuit has a plurality of data samples extracted from an input electrical signal for each sample clock cycle. The plurality of data samples are compared in parallel with a high threshold level and a low threshold level...
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JP2011135709A |
To miniaturize an analog filter circuit and a digital filter circuit by high speed sampling and to eliminate a phase error of a protection control operation by aligning timing of A/D conversion for a plurality of analog inputs.A protecti...
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JP4712760B2 |
A method and system of accurately processing a discrete time input signal, p(n), having a first clock rate into a discrete time output signal having a second clock rate, comprising the steps of delta filtering the input signal to produce...
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JP4714508B2 |
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JP2011123389A |
To suppress an echo caused by words spoken by a user, and a sound emitted from an acoustic device used by a user at a seat of an aircraft, etc., and to effectively reduce noise in the surrounding.A noise reducing device includes a plural...
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JP4706189B2 |
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JP4699555B2 |
Methods, apparatus and computer programs are provided for multiplication-free identification of the impulse response of an oversampled data channel. An input comprising a pseudo-random binary sequence of L symbols is supplied to the chan...
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JP4700951B2 |
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JP4704646B2 |
The present invention is directed to a reconfigurable finite impulse response (FIR) filter that processes data tap values with canonical sign digit (CSD) coefficients. The FIR filter according to the present invention includes a shift gr...
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JP4694706B2 |
To provide a noise eliminating device in which the deformation of signal waveforms will not occur or reduction in noise eliminating capability in a section where a signal gently changes occurs and small amplitude random noise superimpose...
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JP2011517390T |
Low corner frequency U and high corner frequency f2It is the method of generating a shelving filter of a request for voice data of を有 (ing). Here, it is f of a frequency response of a desired shelving filter.2A difference of a gain w...
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JP2011517390A |
Low corner frequency U and high corner frequency f2Is a method of generating a desired shelving filter for audio data. Here, f of the frequency response of the desired shelving filter2The difference between the gain at and the gain at U ...
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JP2011109283A |
To provide a digital filter which is capable of reducing a trouble of a large change of filter characteristics according to the change of a sampling frequency when using an IIR filter.The digital filter includes: a filter coefficient ope...
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JP4691300B2 |
A matched filter for implementing the correlation of an input signal and a reference signal. The matched filter comprises N parallel M-sample long shift registers for receiving an equal number of input signals at the sampling frequency o...
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JP4690017B2 |
A method is disclosed for designing two separable filters, LPP & HPP, that approximates the circularly symmetric frequency response achievable using a non-separable filter. The method selects a cut-off frequency and designs a 1-D low pas...
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