Update project dependencies and configuration: Added ECharts for data visualization, integrated Terser for minification, and adjusted Vite configuration for production. Updated app title and ConnectScreen content to reflect new version. Enhanced EQPage with headphone model loading and frequency response chart rendering.

client/src/old/Coeff.js

@@ -0,0 +1,48 @@
+class Coeff{
+    constructor() {
+        this.b0 = 0;
+        this.b1 = 0;
+        this.b2 = 0;
+        this.a0 = 0;
+        this.a1 = 0;
+        this.a2 = 0;
+    }
+
+    setB0(value){
+        this.b0 = value;
+    }
+
+    setB1(value){
+        this.b1 = value;
+    }
+
+    setB2(value){
+        this.b2 = value;
+    }
+
+    setA0(value){
+        this.a0 = value;
+    }
+
+    setA1(value){
+        this.a1 = value;
+    }
+
+    setA2(value){
+        this.a2 = value;
+    }
+
+    getSectionsMatrix(gain, fc, bw, type, bypass, fs){
+        const w = 2 * fc / fs;
+        const q = fc / bw;
+        const bypassStatus = bypass ? 1 : 0;
+        const bqtype = type + bypassStatus * 10;
+        const sA = Math.pow(10, gain / 40);
+        const sqrt_sA = Math.sqrt(sA);
+        const sin_w = Math.sin(Math.PI * w);
+        const cos_w = Math.cos(Math.PI * w);
+        const alpha = sin_w / (2 * q);
+
+        let b0, b1, b2, a0, a1, a2;
+    }
+}