How to use normalizeFilterCoefficients method in wpt

Best JavaScript code snippet using wpt

biquad-filters.js

Source:biquad-filters.js

...31        a0 = 1 + alpha;32        a1 = -2.0 * cos_w0;33        a2 = 1 - alpha;34    }35    return normalizeFilterCoefficients(b0, b1, b2, a0, a1, a2);36}37function createHighpassFilter(freq, q, gain) {38    var b0;39    var b1;40    var b2;41    var a1;42    var a2;43    if (freq == 1) {44        // The filter is 045        b0 = 0;46        b1 = 0;47        b2 = 0;48        a0 = 1;49        a1 = 0;50        a2 = 0;51    } else if (freq == 0) {52        // The filter is 1.  Computation of coefficients below is ok, but53        // there's a pole at 1 and a zero at 1, so round-off could make54        // the filter unstable.55        b0 = 1;56        b1 = 0;57        b2 = 0;58        a0 = 1;59        a1 = 0;60        a2 = 0;61    } else {62        var w0 = Math.PI * freq;63        var alpha = 0.5 * Math.sin(w0) / Math.pow(10, q / 20);64        var cos_w0 = Math.cos(w0);65        b0 = 0.5 * (1 + cos_w0);66        b1 = -1 - cos_w0;67        b2 = b0;68        a0 = 1 + alpha;69        a1 = -2.0 * cos_w0;70        a2 = 1 - alpha;71    }72    return normalizeFilterCoefficients(b0, b1, b2, a0, a1, a2);73}74function normalizeFilterCoefficients(b0, b1, b2, a0, a1, a2) {75    var scale = 1 / a0;76    return {b0 : b0 * scale,77            b1 : b1 * scale,78            b2 : b2 * scale,79            a1 : a1 * scale,80            a2 : a2 * scale};81}82function createBandpassFilter(freq, q, gain) {83    var b0;84    var b1;85    var b2;86    var a0;87    var a1;88    var a2;89    var coef;90    if (freq > 0 && freq < 1) {91        var w0 = Math.PI * freq;92        if (q > 0) {93            var alpha = Math.sin(w0) / (2 * q);94            var k = Math.cos(w0);95            b0 = alpha;96            b1 = 0;97            b2 = -alpha;98            a0 = 1 + alpha;99            a1 = -2 * k;100            a2 = 1 - alpha;101            coef = normalizeFilterCoefficients(b0, b1, b2, a0, a1, a2);102        } else {103            // q = 0, and frequency is not 0 or 1.  The above formula has a104            // divide by zero problem.  The limit of the z-transform as q105            // approaches 0 is 1, so set the filter that way.106            coef = {b0 : 1, b1 : 0, b2 : 0, a1 : 0, a2 : 0};107        }108    } else {109        // When freq = 0 or 1, the z-transform is identically 0,110        // independent of q.111        coef = {b0 : 0, b1 : 0, b2 : 0, a1 : 0, a2 : 0}112    }113    return coef;114}115function createLowShelfFilter(freq, q, gain) {116    // q not used117    var b0;118    var b1;119    var b2;120    var a0;121    var a1;122    var a2;123    var coef;124    var S = 1;125    var A = Math.pow(10, gain / 40);126    if (freq == 1) {127        // The filter is just a constant gain128        coef = {b0 : A * A, b1 : 0, b2 : 0, a1 : 0, a2 : 0};129    } else if (freq == 0) {130        // The filter is 1131        coef = {b0 : 1, b1 : 0, b2 : 0, a1 : 0, a2 : 0};132    } else {133        var w0 = Math.PI * freq;134        var alpha = 1 / 2 * Math.sin(w0) * Math.sqrt((A + 1 / A) * (1 / S - 1) + 2);135        var k = Math.cos(w0);136        var k2 = 2 * Math.sqrt(A) * alpha;137        var Ap1 = A + 1;138        var Am1 = A - 1;139        b0 = A * (Ap1 - Am1 * k + k2);140        b1 = 2 * A * (Am1 - Ap1 * k);141        b2 = A * (Ap1 - Am1 * k - k2);142        a0 = Ap1 + Am1 * k + k2;143        a1 = -2 * (Am1 + Ap1 * k);144        a2 = Ap1 + Am1 * k - k2;145        coef = normalizeFilterCoefficients(b0, b1, b2, a0, a1, a2);146    }147    return coef;148}149function createHighShelfFilter(freq, q, gain) {150    // q not used151    var b0;152    var b1;153    var b2;154    var a0;155    var a1;156    var a2;157    var coef;158    var A = Math.pow(10, gain / 40);159    if (freq == 1) {160        // When freq = 1, the z-transform is 1161        coef = {b0 : 1, b1 : 0, b2 : 0, a1 : 0, a2 : 0};162    } else if (freq > 0) {163        var w0 = Math.PI * freq;164        var S = 1;165        var alpha = 0.5 * Math.sin(w0) * Math.sqrt((A + 1 / A) * (1 / S - 1) + 2);166        var k = Math.cos(w0);167        var k2 = 2 * Math.sqrt(A) * alpha;168        var Ap1 = A + 1;169        var Am1 = A - 1;170        b0 = A * (Ap1 + Am1 * k + k2);171        b1 = -2 * A * (Am1 + Ap1 * k);172        b2 = A * (Ap1 + Am1 * k - k2);173        a0 = Ap1 - Am1 * k + k2;174        a1 = 2 * (Am1 - Ap1*k);175        a2 = Ap1 - Am1 * k-k2;176        coef = normalizeFilterCoefficients(b0, b1, b2, a0, a1, a2);177    } else {178        // When freq = 0, the filter is just a gain179        coef = {b0 : A * A, b1 : 0, b2 : 0, a1 : 0, a2 : 0};180    }181    return coef;182}183function createPeakingFilter(freq, q, gain) {184    var b0;185    var b1;186    var b2;187    var a0;188    var a1;189    var a2;190    var coef;191    var A = Math.pow(10, gain / 40);192    if (freq > 0 && freq < 1) {193        if (q > 0) {194            var w0 = Math.PI * freq;195            var alpha = Math.sin(w0) / (2 * q);196            var k = Math.cos(w0);197            b0 = 1 + alpha * A;198            b1 = -2 * k;199            b2 = 1 - alpha * A;200            a0 = 1 + alpha / A;201            a1 = -2 * k;202            a2 = 1 - alpha / A;203            coef = normalizeFilterCoefficients(b0, b1, b2, a0, a1, a2);204        } else {205            // q = 0, we have a divide by zero problem in the formulas206            // above.  But if we look at the z-transform, we see that the207            // limit as q approaches 0 is A^2.208            coef = {b0 : A * A, b1 : 0, b2 : 0, a1 : 0, a2 : 0};209        }210    } else {211        // freq = 0 or 1, the z-transform is 1212        coef = {b0 : 1, b1 : 0, b2 : 0, a1 : 0, a2 : 0};213    }214    return coef;215}216function createNotchFilter(freq, q, gain) {217    var b0;218    var b1;219    var b2;220    var a0;221    var a1;222    var a2;223    var coef;224    if (freq > 0 && freq < 1) {225        if (q > 0) {226            var w0 = Math.PI * freq;227            var alpha = Math.sin(w0) / (2 * q);228            var k = Math.cos(w0);229            b0 = 1;230            b1 = -2 * k;231            b2 = 1;232            a0 = 1 + alpha;233            a1 = -2 * k;234            a2 = 1 - alpha;235            coef = normalizeFilterCoefficients(b0, b1, b2, a0, a1, a2);236        } else {237            // When q = 0, we get a divide by zero above.  The limit of the238            // z-transform as q approaches 0 is 0, so set the coefficients239            // appropriately.240            coef = {b0 : 0, b1 : 0, b2 : 0, a1 : 0, a2 : 0};241        }242    } else {243        // When freq = 0 or 1, the z-transform is 1244        coef = {b0 : 1, b1 : 0, b2 : 0, a1 : 0, a2 : 0};245    }246    return coef;247}248function createAllpassFilter(freq, q, gain) {249    var b0;250    var b1;251    var b2;252    var a0;253    var a1;254    var a2;255    var coef;256    if (freq > 0 && freq < 1) {257        if (q > 0) {258            var w0 = Math.PI * freq;259            var alpha = Math.sin(w0) / (2 * q);260            var k = Math.cos(w0);261            b0 = 1 - alpha;262            b1 = -2 * k;263            b2 = 1 + alpha;264            a0 = 1 + alpha;265            a1 = -2 * k;266            a2 = 1 - alpha;267            coef = normalizeFilterCoefficients(b0, b1, b2, a0, a1, a2);268        } else {269            // q = 0270            coef = {b0 : -1, b1 : 0, b2 : 0, a1 : 0, a2 : 0};271        }272    } else {273        coef = {b0 : 1, b1 : 0, b2 : 0, a1 : 0, a2 : 0};274    }275    return coef;276}277function filterData(filterCoef, signal, len) {278    var y = new Array(len);279    var b0 = filterCoef.b0;280    var b1 = filterCoef.b1;281    var b2 = filterCoef.b2;...

Using AI Code Generation

1var wptoolbox = require("wptoolbox");2var filterCoeffs = wptoolbox.normalizeFilterCoefficients([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);3console.log(filterCoeffs);4var wptoolbox = require("wptoolbox");5var filterCoeffs = wptoolbox.normalizeFilterCoefficients([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);6console.log(filterCoeffs);7var wptoolbox = require("wptoolbox");8var filterCoeffs = wptoolbox.normalizeFilterCoefficients([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);9console.log(filterCoeffs);10var wptoolbox = require("wptoolbox");11var filterCoeffs = wptoolbox.normalizeFilterCoefficients([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);12console.log(filterCoeffs);13var wptoolbox = require("wptoolbox");14var filterCoeffs = wptoolbox.normalizeFilterCoefficients([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);15console.log(filterCoeffs);16var wptoolbox = require("wptoolbox");17var filterCoeffs = wptoolbox.normalizeFilterCoefficients([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);18console.log(filterCoeffs);

Using AI Code Generation

1var wptools = require('./wptools.js');2var numCoeffs = [0.1, 0.2, 0.3, 0.4, 0.5];3var denCoeffs = [0.1, 0.2, 0.3, 0.4, 0.5];4var normalizedCoeffs = wptools.normalizeFilterCoefficients(numCoeffs, denCoeffs);5console.log('Normalized Numerator Coefficients: ' + normalizedCoeffs.numeratorCoefficients);6console.log('Normalized Denominator Coefficients: ' + normalizedCoeffs.denominatorCoefficients);7exports.normalizeFilterCoefficients = function (numeratorCoefficients, denominatorCoefficients) {8    var maxDenominatorCoefficient = Math.abs(denominatorCoefficients[0]);9    for (var i = 1; i < denominatorCoefficients.length; i++) {10        var absCoefficient = Math.abs(denominatorCoefficients[i]);11        if (absCoefficient > maxDenominatorCoefficient) {12            maxDenominatorCoefficient = absCoefficient;13        }14    }15    var normalizedNumeratorCoefficients = [];16    var normalizedDenominatorCoefficients = [];17    for (var i = 0; i < numeratorCoefficients.length; i++) {18        normalizedNumeratorCoefficients.push(numeratorCoefficients[i] / maxDenominatorCoefficient);19    }20    for (var i = 0; i < denominatorCoefficients.length; i++) {21        normalizedDenominatorCoefficients.push(denominatorCoefficients[i] / maxDenominatorCoefficient);22    }23    return {24    };25};

Using AI Code Generation

1var wptools = require('..');2var fs = require('fs');3var path = require('path');4var filter = wptools.normalizeFilterCoefficients([0.2, 0.2, 0.2, 0.2, 0.2]);5console.log(filter);6var filter = wptools.normalizeFilterCoefficients([0.2, 0.2, 0.2, 0.2, 0.2], 1);7console.log(filter);8var filter = wptools.normalizeFilterCoefficients([0.2, 0.2, 0.2, 0.2, 0.2], 0);9console.log(filter);10var filter = wptools.normalizeFilterCoefficients([0.2, 0.2, 0.2, 0.2, 0.2], 2);11console.log(filter);12var filter = wptools.normalizeFilterCoefficients([0.2, 0.2, 0.2, 0.2, 0.2], 3);13console.log(filter);14var filter = wptools.normalizeFilterCoefficients([0.2, 0.2, 0.2, 0.2, 0.2], 4);15console.log(filter);16var filter = wptools.normalizeFilterCoefficients([0.2, 0.2, 0.2, 0.2, 0.2], 5);17console.log(filter);18var filter = wptools.normalizeFilterCoefficients([0.2, 0.2, 0.2, 0.2, 0.2], 6);19console.log(filter);20var filter = wptools.normalizeFilterCoefficients([0.2, 0.2, 0.2, 0.2, 0.2], 7);21console.log(filter);22var filter = wptools.normalizeFilterCoefficients([0.2, 0.2, 0.2, 0.2, 0.2], 8);23console.log(filter);24var filter = wptools.normalizeFilterCoefficients([0.2, 0.2, 0.2, 0.2, 0.2], 9);25console.log(filter);

Using AI Code Generation

1var wptools = require('wptools');2var a = [0.5, 0.5];3var b = [0.5, 0.5];4var norm = wptools.normalizeFilterCoefficients(a, b);5console.log(norm);6var wptools = require('wptools');7var a = [0.5, 0.5];8var b = [0.5, 0.5];9var norm = wptools.normalizeFilterCoefficients(a, b, true);10console.log(norm);11var wptools = require('wptools');12var a = [0.5, 0.5];13var b = [0.5, 0.5];14var norm = wptools.normalizeFilterCoefficients(a, b, false);15console.log(norm);16var wptools = require('wptools');17var a = [0.5, 0.5];18var b = [0.5, 0.5];19var norm = wptools.normalizeFilterCoefficients(a, b, true, 0.1);20console.log(norm);21var wptools = require('wptools');22var a = [0.5, 0.5];23var b = [0.5, 0.5];

Using AI Code Generation

1var wptools = require('wptools');2var fs = require('fs');3var filterCoefficients = [1, 2, 3, 4, 5];4var normalizedFilterCoefficients = wptools.normalizeFilterCoefficients(filterCoefficients);5console.log(normalizedFilterCoefficients);6var wptools = require('wptools');7var fs = require('fs');8var filterCoefficients = [1, 2, 3, 4, 5];9var signal = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];10var filteredSignal = wptools.filter(filterCoefficients, signal);11console.log(filteredSignal);12var wptools = require('wptools');13var fs = require('fs');14var filterType = 'lowpass';15var filterOrder = 3;16var filterCutoffFrequency = 0.2;17var filterCoefficients = wptools.generateFilterCoefficients(filterType, filterOrder, filterCutoffFrequency);18console.log(filterCoefficients);19var wptools = require('wptools');20var fs = require('fs');21var filterType = 'highpass';22var filterOrder = 3;23var filterCutoffFrequency = 0.2;24var filterCoefficients = wptools.generateFilterCoefficients(filterType, filterOrder, filterCutoffFrequency);25console.log(filterCoefficients);26var wptools = require('wptools');27var fs = require('fs');28var filterType = 'bandpass';29var filterOrder = 3;

Using AI Code Generation

1var wptoolkit = require('wptoolkit');2var b = [1, 2, 3];3var a = [1, 2, 3];4var normalizedCoefficients = wptoolkit.normalizeFilterCoefficients(b, a);5var frequencyResponse = wptoolkit.calculateFrequencyResponse(normalizedCoefficients.b, normalizedCoefficients.a);6console.log(frequencyResponse);7var frequencyResponse = wptoolkit.calculateFrequencyResponse(b, a);8console.log(frequencyResponse);

Using AI Code Generation

1var wptools = require('./wptools.js');2var b = [1, 2, 3, 4, 5];3var a = [1, 2, 3, 4, 5];4var b_normalized = wptools.normalizeFilterCoefficients(b);5var a_normalized = wptools.normalizeFilterCoefficients(a);6console.log(b_normalized);7console.log(a_normalized);

Using AI Code Generation

1var wpt = new WPT();2var coeffs = [1,2,3,4,5,6,7,8,9,10];3var normalizedCoeffs = wpt.normalizeFilterCoefficients(coeffs);4console.log('Normalized filter coefficients: ' + normalizedCoeffs);5filter(input, filterCoeffs)6WPT.prototype.filter = function(input, filterCoeffs) {7  var output = [];8  var n = input.length;9  var m = filterCoeffs.length;10  var i, j, sum;11  for (i = 0; i < n; i++) {12    sum = 0;13    for (j = 0; j < m; j++) {14      sum += input[i - j] * filterCoeffs[j];15    }16    output[i] = sum;17  }18  return output;19};20filter(input, filterCoeffs)

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