语调不清?

问题描述

除了Console.Beep方法之外，是否还有其他方法可以使您产生音调?要使哔哔声从一个频率开始但逐渐从另一个频率结束?

Is there a way to make real-time tones other than the Console.Beep method that let's you slur notes? To make the beep start at one frequency but gradually end at a different one?

推荐答案

您可以使用JohnWein的BeepBeep:

you can use JohnWein's BeepBeep for it:

https://social.msdn.microsoft.com/Forums/vstudio/zh-CN/18fe83f0-5658-4bcf-bafc-2e02e187eb80/beep-beep?forum=csharpgeneral

https://social.msdn.microsoft.com/Forums/vstudio/en-US/18fe83f0-5658-4bcf-bafc-2e02e187eb80/beep-beep?forum=csharpgeneral

修改它以增加循环中的频率...

Modify it to increment the frequency in the loop...

需要在代码文件的顶部:

needed at the top of the code file:

使用System.IO;
使用System.Media;

using System.IO;
using System.Media;

然后例如:

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.Load += Form1_Load;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //protect your ears, leave the amplitude low while testing.
            Beep.BeepBeep(100, 500, 2000);
        }
    }

    public class Beep
    {
        //orig by JohnWein, https://social.msdn.microsoft.com/Forums/vstudio/en-US/18fe83f0-5658-4bcf-bafc-2e02e187eb80/beep-beep?forum=csharpgeneral
        public static void BeepBeep(int Amplitude, double Frequency, int Duration)
        {
            double A = ((Amplitude * (System.Math.Pow(2, 15))) / 1000) - 1;
            double DeltaFT = 2 * Math.PI * Frequency / 44100.0;
            int Samples = 441 * Duration / 10;
            double increment = Frequency / (double)Samples; //be careful with setting this, might hurt your ears when producing chirp sounds, so dont use with ear buds in.

            int Bytes = Samples * 4;
            int[] Hdr = { 0X46464952, 36 + Bytes, 0X45564157, 0X20746D66, 16, 0X20001, 44100, 176400, 0X100004, 0X61746164, Bytes };
            using (MemoryStream MS = new MemoryStream(44 + Bytes))
            {
                using (BinaryWriter BW = new BinaryWriter(MS))
                {
                    for (int I = 0; I < Hdr.Length; I++)
                    {
                        BW.Write(Hdr[I]);
                    }
                    for (int T = 0; T < Samples; T++)
                    {
                        Frequency += increment;
                        DeltaFT = 2 * Math.PI * Frequency / 44100.0;
                        short Sample = System.Convert.ToInt16(A * Math.Sin(DeltaFT * T));
                        BW.Write(Sample);
                        BW.Write(Sample);
                    }
                    BW.Flush();
                    MS.Seek(0, SeekOrigin.Begin);
                    using (SoundPlayer SP = new SoundPlayer(MS))
                    {
                        SP.PlaySync();
                    }
                }
            }
        }
    }

此致

 托尔斯滕

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