mysite/freqgen.html at main · zvdxc/mysite · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Frequency Generator</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            margin: 0;
            padding: 20px;
        }

        h1 {
            color: #333;
        }

        label {
            margin-right: 10px;
        }

        select, input {
            margin-bottom: 10px;
            padding: 5px;
        }

        button {
            margin-right: 10px;
            padding: 5px 10px;
            background-color: #007bff;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
        }

        button:hover {
            background-color: #0056b3;
        }
    </style>
</head>
<body>
    <h1>Frequency Generator</h1>
    <label for="waveform">Select Waveform:</label>
    <select id="waveform">
        <option value="sine">Sine</option>
        <option value="square">Square</option>
        <option value="triangle">Triangle</option>
        <option value="sawtooth">Sawtooth</option>
    </select>
    <br>
    <label for="frequency">Frequency (Hz):</label>
    <input type="number" id="frequency" value="440" min="20" max="20000">
    <br>
    <button id="play">Play</button>
    <button id="stop">Stop</button>
    <br>
    <label for="volume">Volume:</label>
    <input type="range" id="volume" value="100" min="0" max="100">
    <script>
        const audioContext = new (window.AudioContext || window.webkitAudioContext)();
        let oscillator;
        let gainNode;

        document.getElementById('play').addEventListener('click', () => {
            const waveform = document.getElementById('waveform').value;
            const frequency = parseFloat(document.getElementById('frequency').value);
            const volume = parseFloat(document.getElementById('volume').value) / 100;

            gainNode = audioContext.createGain();
            gainNode.gain.value = volume;
            gainNode.connect(audioContext.destination);

            oscillator = audioContext.createOscillator();
            oscillator.type = waveform;
            oscillator.frequency.setValueAtTime(frequency, audioContext.currentTime);
            oscillator.connect(gainNode);
            oscillator.start();
        });

        document.getElementById('stop').addEventListener('click', () => {
            if (oscillator) {
                oscillator.stop();
                oscillator.disconnect();
            }
        });

        document.getElementById('volume').addEventListener('input', (event) => {
            if (gainNode) {
                gainNode.gain.value = event.target.value / 100;
            }
        });
    </script>
</body>
</html>