KR880012000A - Filter coefficient calculation device and setting method of filter coefficient calculation - Google Patents

Abstract

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Description

Filter coefficient calculation device and setting method of filter coefficient calculation

Since this is an open matter, no full text was included.

2 is a block diagram showing a first embodiment of the FIR coefficient calculating apparatus of the present invention.

3 shows (a), (b), (c) and (d) the desired frequency characteristic bands.

4 is a diagram of sample point interpolation.

Claims (31)

Input means for inputting desired frequency characteristics, dividing means for dividing the frequency characteristic input by the input means into a plurality of frequency bands, and realizing frequency characteristics of each frequency band divided by the dividing means. A filter coefficient calculating device comprising: calculating means for obtaining filter coefficients of a transverse filter. 2. The filter coefficient calculating device according to claim 1, wherein the desired frequency characteristic is an amplitude frequency characteristic or a phase frequency characteristic or a group delay frequency characteristic or a group delay skew frequency characteristic. The filter coefficient calculating device according to claim 1, wherein the input means inputs frequency characteristics by frequency resolution corresponding to the number of filter coefficients of each transverse filter. The frequency input corresponding to the number of filter coefficients of the transversal filter for each frequency band is input in a part where the input means overlaps in frequency bands corresponding to a plurality of different sampling frequencies. A filter for dividing the frequency characteristic by dividing the frequency characteristic by calculating a frequency characteristic having a large frequency resolution of overlapping frequency bands from a frequency characteristic having a small overlapping frequency resolution inputted by the input means. Coefficient computing device. 2. The input means according to claim 1, wherein the input means has a large frequency resolution corresponding to the number of filter coefficients of the transversal filter for each frequency band near the boundary of the portion where the frequency bands corresponding to the plurality of sampling frequencies overlap. The dividing means for inputting and dividing the input frequency characteristic includes the frequency characteristic near the boundary inputted by the input means, the frequency characteristic of the frequency characteristic where the frequency band overlaps with the other frequency band of the small frequency resolution overlapping. A filter coefficient calculating device that obtains by performing calculation from frequency characteristics having large overlapping frequency resolution and divides the frequency characteristics. The frequency resolution according to claim 1, wherein the input means inputs by frequency resolution irrespective of the number of filter coefficients of the transversal filter, and inputs the input frequency characteristic corresponding to the number of filter coefficients of each phase transversal filter. Filter coefficient computing device that calculates and sets the value at. The method according to claim 1, wherein the input means is performed by sampling the first type (the method of taking the sampling point of frequency not from frequency 0, but for each frequency resolution determined by the sampling frequency and the filter coefficient of the transversal filter). Filter coefficient calculator. The method according to claim 1, wherein the input means expands by the sample of the second type (the method of taking the sampling point of the frequency at every frequency resolution determined by the sampling frequency and the filter coefficient of the transversal filter, not from frequency 0). Filter coefficient calculating device. The sampling means according to claim 1, wherein the input means inputs irrespective of the sampling of the first type and the second type, and the dividing means calculates the sampling point of the first type or the second type from the frequency characteristics inputted by the input means. A filter coefficient calculating device that obtains and divides the data. The method according to claim 1, wherein the input means multiplies a window function having some characteristic with respect to the obtained filter coefficient when the frequency characteristic set by the dividing means is performed by sampling of the first type. A filter coefficient calculating device wherein multiplying this window is a filter coefficient. The frequency corresponding to the transversal filter according to claim 1, wherein the dividing means has a frequency corresponding to the transversal filter from a frequency higher than or equal to a cutoff frequency of a high pass of the band pass filter which actually divides a signal input to each transversal filter that processes the signal. A filter coefficient calculating device for correcting and dividing a frequency characteristic toward zero toward a Nyquist frequency (half frequency of a sampling frequency) of a band. The filter coefficient calculating device according to claim 1, wherein the dividing means corrects and divides the frequency characteristic at zero at the Nyquist frequency (half frequency of the sampling frequency) of the frequency band corresponding to a plurality of different sampling frequencies. . 2. The filter coefficient calculating device according to claim 1, wherein the calculating means includes first converting means for performing Hilbert transform or linear phase transform on the amplitude frequency characteristic in the temporary band divided by the divider. The method of claim 13, wherein the calculating means. A filter coefficient calculating device comprising: a reverse means for changing the inverse purge with a characteristic obtained by the first converting means. 2. The apparatus according to claim 1, further comprising: input means for inputting desired amplitude frequency characteristics, band division means for dividing a band of amplitude frequency characteristics input by said input means, and extracting a sample point, and said band division A first conversion means for performing a hill belt transformation or a linear phase transformation on the amplitude frequency characteristic in each band divided by the means, and performing inverse Fourier transformation on the characteristics converted by the first conversion means. And a transmission means for directly or indirectly transmitting the filter coefficients obtained by the second conversion means and the second conversion means. 2. The apparatus according to claim 1, further comprising: sampling frequency conversion means for equalizing all sampling frequencies of filter coefficients obtained by inverse Fourier transform means in each divided band, and only signals of a predetermined band from the outputs of the respective sampling frequency conversion means. A filter coefficient calculating device, comprising: a plurality of band pass filter means for outputting, and an adding means for adding the filter coefficients obtained in each band, to transmit the added filter coefficients by the transmitting means. Input means having an amplitude input means for inputting an arbitrary amplitude frequency characteristic and a phase input means for inputting an arbitrary phase frequency characteristic, and an inverse pusher for obtaining an impulse response to a transfer function having the input amplitude frequency characteristic and phase frequency characteristic. A filter coefficient calculating device having conversion means and setting means for setting an impulse response obtained by inverse Fourier transform as a filter coefficient to filter means such as an external transversal filter. 18. The apparatus according to claim 17, wherein the input means comprises: a phase amplitude characteristic in relation to a Hilbert transform based on a correction amplitude input means for inputting an arbitrary correction amplitude frequency characteristic and a maintenance amplitude frequency characteristic inputted by the correction amplitude input means. And a filter coefficient calculating device for obtaining filter coefficients by an inverse Fourier transforming means from a transfer function having an amplitude frequency characteristic inputted by said amplitude input means and a phase frequency characteristic obtained by said calculating means. 18. The apparatus of claim 17, wherein the phase input means comprises: group delay input means for inputting group delay or old delay skewed frequency frequency characteristic? (W), and starch means for calculating phase frequency characteristic by integrating group delay or group delay skewed frequency characteristic; And a filter coefficient calculated by the inverse Fourier transform means from a transfer function having an amplitude frequency characteristic input by the amplitude input means and a phase frequency characteristic obtained by the integrating means. 18. The phase input unit according to claim 17, wherein the phase input unit inputs only phase frequency characteristics in the range of W = 1 to π (W: each frequency), reverses the phase frequency characteristics, and repeats again W = π to 2π. A filter coefficient computing device for generating amplitude frequency characteristics in the range of < RTI ID = 0.0 > and < / RTI > 18. The amplitude input unit according to claim 17, wherein the amplitude input unit inputs only the amplitude frequency characteristics in the range of W = 0 to π (W: each frequency), and repeats the amplitude frequency characteristics in the range of W = π to 2π. And a filter coefficient calculating device that sets this as the overall amplitude frequency characteristic. 18. The filter coefficient calculating device according to claim 17, further comprising: window means for multiplying an impulse response obtained by the converting means by a window, and using the impulse response multiplied by this window as a filter coefficient. 18. The apparatus according to claim 17, wherein the input means inputs an amplitude frequency characteristic by the second type of sampling frequency, and the inverse purge converting means uses the inputted amplitude frequency characteristic to sample the first type by the condition of the linear phase. A filter coefficient calculating means for converting an inverse purifier using a sampling frequency of a first type from a transfer function calculated by frequency to obtain an impulse response. The method according to claim 17, wherein the first table moving in response to the movement of an object is displayed, the frequency value is taken from the horizontal position of the position where the first table is located, and the amplitude value is set from the vertical position, and furthermore, A filter coefficient calculating device having setting means for displaying the position in a second table. 25. The filter coefficient calculating device according to claim 24, wherein the setting means stores a frequency value and an amplitude value set immediately before, and connects these two positions in a straight line or a curve when the frequency value and the amplitude value are set next, and displays them. . 25. The filter coefficient calculating device according to claim 24, wherein the setting means erases the already displayed line and sets a new value when the already displayed line is the same frequency value and amplitude value as the newly displayed line. 25. The filter coefficient calculating device according to claim 24, wherein the setting means displays numerical values of frequency and amplitude which are established. 25. The apparatus of claim 24, wherein the first table has the shape of a shovel and the second table has the shape of a circle or a cross. 18. The filter coefficient according to claim 17, wherein the filter coefficient to be obtained is a filter coefficient of an FIR filter or an IIR filter composed of a digital circuit, or a parameter (frequency, Q, gain) of a parametric filter composed of an analog circuit. Filter coefficient computing device. The amplitude frequency characteristic is inputted to the input circuit by the sampling frequency of the first kind or the second kind, and the sampling frequency of the first kind and the sampling frequency of the second kind are obtained by using the Hilbert transform relationship from the input amplitude frequency characteristic. In combination, the transfer function is obtained, and when the amplitude frequency characteristic is set to the first type of sampling frequency in the input circuit, the transfer function is converted into an inverse purifier at the second type of sampling frequency to obtain an impulse response. In case of setting two kinds of sampling frequency, the transfer function is converted into inverse purifier at first sampling frequency to obtain impulse response. How to set the calculation of filter coefficients to be set in the filter. When the amplitude frequency characteristic is input to the input circuit according to the first or second type sampling frequency, the transfer function is obtained from the input amplitude frequency characteristic, and the amplitude frequency characteristic is set to the sampling frequency of the first type. In the following example, the transfer function is converted into an inverse purge using a sampling frequency of a second type to obtain an impulse response. When the sampling frequency of the second type is set in the input circuit, the transfer function is reversed using a sampling frequency of a first type. A filter coefficient calculation setting method for converting the impulse response by converting the result into an integer, and setting the real part of the impulse response obtained by the inverse Fourier transform as a filter coefficient to an external translator assertion filter. ※ Note: This is to be disclosed based on the first application.