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JP4585162B2 |
Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input signal, and down-converting the filtere...
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JP4581114B2 |
To provide an adaptive filter capable of realizing high-speed convergence, simple computation, high tracking capability, and sufficiently low delay together with step size control for each frequency domain. An adaptive filter 80 includes...
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JP4580508B2 |
To improve the cancellation performance by excluding an influence of a noise energy to perform stable noise suppression processing even in the case of variance of the noise energy and preventing an unexpected noise from being erroneously...
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JP4582680B2 |
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JP4581970B2 |
A sampling frequency conversion apparatus having sampling frequency conversion circuits for a plurality of channels includes a detector operable to detect phase information of digital signals inputted to the conversion circuit for each c...
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JP2010245629A |
To obtain at low cost an adaptive equalizer which has a short processing delay.In the adaptive equalizer 100, a first sampling frequency is set to a value higher than a value of a second sampling frequency. First and second input signals...
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JP4571316B2 |
A matched filter computes complex correlations between a sequence of complex input values and a complex code. The matched filter includes a set of N changeover switches (55) having a first input connected to receive real parts (Sr) of th...
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JP2010233198A |
To switch characteristics of a filter in a short period of time. An infinite impulse response (IIR) filter 10 performs filtering processing to digital input audio signal Sin according to an established coefficient COEFF. An RAM 20 stores...
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JP2010232714A |
To control a signal passband without increasing the number of taps.The signal processing apparatus includes: an analysis signal-generating section that converts a digital signal into an analysis signal of a complex number, using a digita...
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JP4563561B2 |
Digital remodulation systems typically include digital to analog converters which have an inherent undesirable sin(x)/x frequency response. Digital remodulated signals are typically high frequency and thus not conducive to sin(x)/x pre-c...
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JP4561151B2 |
A second-order Volterra filter has a quadratic section including a plurality of multiplication units that multiply a first input signal with a second input signal. One of the multiplication units employs a signal not delayed from the fir...
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JP4563310B2 |
A radio receiver including a reception processing system that uses a discrete-time frequency conversion to acquire a signal having a sampling rate corresponding to a local frequency, wherein the reception characteristic is improved when ...
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JP2010226714A |
To provide a method and device for implementing finite impulse response filters, called FIR filters where filtering is applied to finite sets of samples.The FIR filter is prescribed by symmetrical coefficients of odd numbers M=2L+1 aroun...
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JP2010219582A |
To reduce a computation amount, or the like, in the convolution computation of the discrete-time signal x[n] of a length N and the filter coefficient h[m] of a length M.N and M satisfy the condition: M-1≤(P-N)/2. The discrete-time sign...
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JP2010220096A |
To reduce power consumption when a memory storing filter coefficients is accessed.A digital signal processor includes a memory 2 for storing coefficients, which is divided into partial memories for storing a plurality of filter coefficie...
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JP4554855B2 |
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JP4547123B2 |
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JP4549535B2 |
A device for processing digital data. A module (M 2 , M 3 ) produces on a data vector of the frequency domain Z(k), wherein K varies from 0 to N-1, a convolution with a function U, convolution which corresponds to a cancellation in the t...
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JP4548767B2 |
A sampling apparatus for converting first data, sampled at a first sampling rate, into second data, sampled at a second sampling rate. A FIFO storing the first data based on a write control signal and outputs the second data read out bas...
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JP4548516B2 |
A coefficient compensating unit 33 calculates based on a loop point and a cross-fade point of impulse response coefficient data renewed compensation impulse response coefficients specified for a cross-fade period defined between the cros...
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JP4545272B2 |
To actualize a digital attenuator with smaller layout area without using any large-capacity memory. A fine coefficient multiplication part 1 performs multiplication by a fine coefficient which enables an attenuation quantity to be set in...
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JP4545161B2 |
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JP4538705B2 |
Power spectrum data is calculated from a digital audio signal D 10. A part of power spectrum data is extracted from thus calculated power spectrum data. Classification is made based on the extracted part of power spectrum data. And the d...
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JP2010192983A |
To improve efficiency of filter processing for an image.A filter processing module (100) includes a filter circuit (208) and a control circuit (209). The filter circuit includes a first register (206) capable of storing data, a first ari...
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JP4535548B2 |
The disclosed filter structure employs parallel first and second input signal data paths. The first data path includes a digital Finite Impulse Response (FIR) filter having a small number of non-zero multiplier coefficients to define its...
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JP4534609B2 |
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JP2010182382A |
To provide a digital audio signal interpolation apparatus and a digital audio signal interpolation method, for minimizing an error with respect to a true value as much as possible with simple processing.The apparatus selects an interpola...
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JP4527716B2 |
A synthesizer for generating a decorrelation signal using an input signal is operative on a plurality of subband signals, wherein a subband signal includes a sequence of at least two subband samples, the sequence of the subband samples r...
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JP2010178307A |
To reduce the price of an FIR type digital filter by making circuit scale small and constant regardless of increase/decrease in the number of taps.A digital filter includes a memory 43 for storing FIR output data indicating a result of a...
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JP4516644B2 |
A receiving beam is formed using 60 elements arranged in a 90° sector area of a cylindrical receiving array. Receiving beam 0 is formed with elements 0-59 divided into two (front and rear) groups. Specifically, the elements 0-59 are div...
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JP4519807B2 |
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JP4516051B2 |
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JP4512138B2 |
An adaptive equalizer including an equalizer filter and a tap coefficients generator used to process a sample data stream derived from a plurality of received signals is disclosed. The tap coefficients generator includes an equalizer tap...
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JP4511796B2 |
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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JP4509604B2 |
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JP4505565B2 |
The transmitter receives the digital information signal with the specific first sampling frequency, and lowpass filters and downpasses the signal to obtain a lowpass filtered version of the signal with a specific second sampling frequenc...
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JP4504414B2 |
In a method for reducing data in a multi-channel data transmission, existing cross-relations between the signal channels are determined with due consideration of the transit-time difference. Upon the data transmission, a signal channel, ...
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JP2010154389A |
To accomplish a band dividing apparatus, which converts digital audio signals into low-frequency, medium-frequency and high-frequency analog signals, inexpensively while maintaining signal quality. A band division processing section 50 c...
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JP2010154111A |
To provide an IIR filter design method that can accurately calculate filter coefficients used for an IIR filter. A method of designing an IIR filter used in digital signal processing, comprises a step of setting an optimum solution of fi...
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JP4499240B2 |
To provide a signal processing filter system that can decide between setting the reduction in a signal throughput total sum as a higher priority or the reduction in a signal processing delay time as a higher priority and can cope with bo...
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JP4495522B2 |
The present invention provides a digital imaging apparatus having an optical sensor, an analog-to-digital converter, a plurality of computational elements, and an interconnection network. The optical sensor converts an object image into ...
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JP2010148034A |
To reduce the number of multipliers using an upsampling filer that performs N-fold upsampling to data. Two or more data generation means C, in an aspect in which a time-series value for data is previously set, generate two or more kinds ...
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JP4493720B2 |
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JP4494531B2 |
A filter co-processor within a Digital Signal Processor (DSP) takes advantage of the orthogonal nature of modulated signals during the equalization process. Since, after reception, only certain real/imaginary values of the received signa...
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JP2010141780A |
To obtain an IIR filter design method capable of precisely calculating a filter factor of a higher order IIR filter. This invention is based on a method of designing the IIR filter comprising the steps of: calculating a provisional filte...
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JP4488496B2 |
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JP2010135879A |
To overcome the problem that a conventional digital signal processing circuit cannot maintain linearity of data before and after a no-signal state.The digital signal processing circuit has: a digital filter 10 for executing digital filte...
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JP4480584B2 |
The present invention provides an adaptive equalization circuit and adaptive equalization method that can perform signal processing on a small scale with good computation accuracy, and can improve the reproducing signal quality and impro...
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JP2010130185A |
To provide a sampling rate conversion circuit for achieving an optional conversion ratio by a relatively small circuit scale. The sampling rate conversion circuit 14 has a CIC filter (cascade integrator comb filter), and the CIC filter c...
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JP2010130460A |
To solve the problem that a degree of freedom in a filter coefficient correction method is low in a conventional filter coefficient calculation method.The filter coefficient calculation method is the filter coefficient calculation method...
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