biquad-filter.umd.js

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module.exports = require('./dist/biquad-filter');

},{"./dist/biquad-filter":2}],2:[function(require,module,exports){
/**
 * @fileoverview Biquad Filter library
 * @author Arnau.Julia <Arnau.Julia@gmail.com>
 * @version 0.1.0
 */

/**
 * @class BiquadFilter
 * @public
 */
"use strict";

var _createClass = require("babel-runtime/helpers/create-class")["default"];

var _classCallCheck = require("babel-runtime/helpers/class-call-check")["default"];

Object.defineProperty(exports, "__esModule", {
    value: true
});

var BiquadFilter = (function () {
    function BiquadFilter() {
        _classCallCheck(this, BiquadFilter);

        this.coefficients = [];
        this.numberOfCascade = 1;
        this.resetMemories();
    }

    /**
     * Set biquad filter coefficients
     * @public
     * @param coef Array of biquad coefficients in the following order: gain, firstBiquad b1, firstBiquad b2, firstBiquad a1, firstBiquad a2, secondBiquad b1, secondBIquad b2, etc.
     */

    _createClass(BiquadFilter, [{
        key: "setCoefficients",
        value: function setCoefficients(coef) {
            if (coef) {
                // If there is not a number of biquads, we consider that there is only 1 biquad.
                this.numberOfCascade = this.getNumberOfCascadeFilters(coef);
                // Reset coefficients
                this.coefficients = [];
                // Global gain
                this.coefficients.g = coef[0];
                for (var i = 0; i < this.numberOfCascade; i++) {
                    // Four coefficients for each biquad
                    this.coefficients[i] = {
                        b1: coef[1 + i * 4],
                        b2: coef[2 + i * 4],
                        a1: coef[3 + i * 4],
                        a2: coef[4 + i * 4]
                    };
                }
                // Need to reset the memories after change the coefficients
                this.resetMemories();
                return true;
            } else {
                throw new Error("No coefficients are set");
            }
        }

        /**
         * Get the number of cascade filters from the list of coefficients
         * @private
         */
    }, {
        key: "getNumberOfCascadeFilters",
        value: function getNumberOfCascadeFilters(coef) {
            return (coef.length - 1) / 4;
        }

        /**
         * Reset memories of biquad filters.
         * @public
         */
    }, {
        key: "resetMemories",
        value: function resetMemories() {
            this.memories = [{
                xi1: 0,
                xi2: 0,
                yi1: 0,
                yi2: 0
            }];
            // see http://stackoverflow.com/a/19892144
            for (var i = 1; i < this.numberOfCascade; i++) {
                this.memories[i] = {
                    yi1: 0,
                    yi2: 0
                };
            }
        }

        /**
         * Calculate the output of the cascade of biquad filters for an inputBuffer.
         * @public
         * @param inputBuffer Array of the same length of outputBuffer
         * @param outputBuffer Array of the same length of inputBuffer
         */
    }, {
        key: "process",
        value: function process(inputBuffer, outputBuffer) {
            var x;
            var y = [];
            var b1, b2, a1, a2;
            var xi1, xi2, yi1, yi2, y1i1, y1i2;

            for (var i = 0; i < inputBuffer.length; i++) {
                x = inputBuffer[i];
                // Save coefficients in local variables
                b1 = this.coefficients[0].b1;
                b2 = this.coefficients[0].b2;
                a1 = this.coefficients[0].a1;
                a2 = this.coefficients[0].a2;
                // Save memories in local variables
                xi1 = this.memories[0].xi1;
                xi2 = this.memories[0].xi2;
                yi1 = this.memories[0].yi1;
                yi2 = this.memories[0].yi2;

                // Formula: y[n] = x[n] + b1*x[n-1] + b2*x[n-2] - a1*y[n-1] - a2*y[n-2]
                // First biquad
                y[0] = x + b1 * xi1 + b2 * xi2 - a1 * yi1 - a2 * yi2;

                for (var e = 1; e < this.numberOfCascade; e++) {
                    // Save coefficients in local variables
                    b1 = this.coefficients[e].b1;
                    b2 = this.coefficients[e].b2;
                    a1 = this.coefficients[e].a1;
                    a2 = this.coefficients[e].a2;
                    // Save memories in local variables
                    y1i1 = this.memories[e - 1].yi1;
                    y1i2 = this.memories[e - 1].yi2;
                    yi1 = this.memories[e].yi1;
                    yi2 = this.memories[e].yi2;

                    y[e] = y[e - 1] + b1 * y1i1 + b2 * y1i2 - a1 * yi1 - a2 * yi2;
                }

                // Write the output
                outputBuffer[i] = y[this.numberOfCascade - 1] * this.coefficients.g;

                // Update the memories
                this.memories[0].xi2 = this.memories[0].xi1;
                this.memories[0].xi1 = x;

                for (var p = 0; p < this.numberOfCascade; p++) {
                    this.memories[p].yi2 = this.memories[p].yi1;
                    this.memories[p].yi1 = y[p];
                }
            }
        }
    }]);

    return BiquadFilter;
})();

exports["default"] = BiquadFilter;
module.exports = exports["default"];

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b2, firstBiquad a1, firstBiquad a2, secondBiquad b1, secondBIquad b2, etc.\n     */\n    setCoefficients(coef) {\n        if (coef) {\n            // If there is not a number of biquads, we consider that there is only 1 biquad.\n            this.numberOfCascade = this.getNumberOfCascadeFilters(coef);\n            // Reset coefficients\n            this.coefficients = [];\n            // Global gain\n            this.coefficients.g = coef[0];\n            for (var i = 0; i < this.numberOfCascade; i++) {\n                // Four coefficients for each biquad\n                this.coefficients[i] = {\n                    b1: coef[1 + i * 4],\n                    b2: coef[2 + i * 4],\n                    a1: coef[3 + i * 4],\n                    a2: coef[4 + i * 4]\n                };\n            }\n            // Need to reset the memories after change the coefficients\n            this.resetMemories();\n            return true;\n        } else {\n            throw new Error(\"No coefficients are set\");\n        }\n    }\n\n    /**\n     * Get the number of cascade filters from the list of coefficients\n     * @private\n     */\n    getNumberOfCascadeFilters(coef) {\n        return (coef.length - 1) / 4;\n    }\n\n    /**\n     * Reset memories of biquad filters.\n     * @public\n     */\n    resetMemories() {\n        this.memories = [{\n            xi1: 0,\n            xi2: 0,\n            yi1: 0,\n            yi2: 0\n        }];\n        // see http://stackoverflow.com/a/19892144\n        for (var i = 1; i < this.numberOfCascade; i++) {\n            this.memories[i] = {\n                yi1: 0,\n                yi2: 0\n            };\n        }\n    }\n\n    /**\n     * Calculate the output of the cascade of biquad filters for an inputBuffer.\n     * @public\n     * @param inputBuffer Array of the same length of outputBuffer\n     * @param outputBuffer Array of the same length of inputBuffer\n     */\n    process(inputBuffer, outputBuffer) {\n        var x;\n        var y = [];\n        var b1, b2, a1, a2;\n        var xi1, xi2, yi1, yi2, y1i1, y1i2;\n\n        for (var i = 0; i < inputBuffer.length; i++) {\n            x = inputBuffer[i];\n            // Save coefficients in local variables\n            b1 = this.coefficients[0].b1;\n            b2 = this.coefficients[0].b2;\n            a1 = this.coefficients[0].a1;\n            a2 = this.coefficients[0].a2;\n            // Save memories in local variables\n            xi1 = this.memories[0].xi1;\n            xi2 = this.memories[0].xi2;\n            yi1 = this.memories[0].yi1;\n            yi2 = this.memories[0].yi2;\n\n            // Formula: y[n] = x[n] + b1*x[n-1] + b2*x[n-2] - a1*y[n-1] - a2*y[n-2]\n            // First biquad\n            y[0] = x + b1 * xi1 + b2 * xi2 - a1 * yi1 - a2 * yi2;\n\n            for (var e = 1; e < this.numberOfCascade; e++) {\n                // Save coefficients in local variables\n                b1 = this.coefficients[e].b1;\n                b2 = 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