Beep beep hearing test in C#

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.NET3.5

I am working on .Net compact framework 3.5. I want to generate a beep for my device and I am referring a code which is written in VB.Net. But the problem is I can not use the same wave format in C#.Net. I am referring this thread to generate a beep sound

https://social.msdn.microsoft.com/Forums/vstudio/en-US/c2b953b6-3c85-4eda-a478-080bae781319/beep-beep?forum=vbgeneral[^]

What I have tried:

C#

using System.Collections.Generic;
using System.Text;
using System.Media;

namespace RFID_IndicateRSSI
{
    class beep
    {
        public void Beep(int Amplitude, int Frequency, int Duration)
        {
            double A = ((Amplitude * 2 ^ 15) / 1000) - 1;
            double DeltaFT = 2 * Math.PI * Frequency / 44100;
            
            int Samples = 441 * Duration;
            int Bytes = Samples * 4;
            int[] hdr = {&H46464952, 36 + Bytes, &H45564157,&H20746D66, 16, &H20001, 44100,176400, &H100004, &H61746164, Bytes};
            using (MemoryStream MS = new MemoryStream(44 + Bytes))
            {

                using (BinaryWriter BW = new BinaryWriter(MS))
                {
                    for (int i = 0; i < hdr.Length-1; i++)
                    {
                        BW.Write(hdr[i]);
                    }
                    for (int i = 0; i < Samples -1; i++)
                    {
                        short sample;
                        sample = Convert.ToInt16(A * Math.Sin(DeltaFT * i));
                        BW.Write(sample);
                        BW.Write(sample);
                    }
                    BW.Flush();
                    MS.Seek(0, SeekOrigin.Begin);
                    using (SoundPlayer SP = new SoundPlayer(MS))
                    {
                        SP.Stream = null;
                        SP.Stream = MS;
                        SP.PlaySync();                        
                    }
                }
            }
        }

    }
}

I tried with this code but value in 'hdr' getting error. The error is 'The wave header is corrupt' Even if I try to write some another stream of data, its not accepting as well. I need help with this one.

P.S. I can not use Console.beep(). It's not supported by Net Compact framework.

Posted 1-Mar-18 6:58am

webmail123

Updated 1-Mar-18 8:57am

Richard Deeming

v5

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Comments

Richard Deeming 1-Mar-18 13:58pm

If you want someone to help you fix an error, then you need to tell us what the error is.

Click the green "Improve question" link, and add the full details of the error you're getting.

webmail123 1-Mar-18 14:24pm

@Richard Sorry for the confusion. I updated the question.

Richard Deeming 1-Mar-18 14:32pm

I notice you've changed the calculation for Samples - are you sure the value is still valid?

Based on the MSDN thread, it should be:

int Samples = 441 * Duration / 10;

webmail123 1-Mar-18 14:41pm

@Richard Thanks for the reply. I think that is not a problem at all. The problem is in hdr[]. That particular format of wave file is not recognizable. So that's why I am getting error.

Richard Deeming 1-Mar-18 14:46pm

I assume you've replaced the VB hex prefix (&H) with the C# one (0x)? Otherwise, you'd get a compiler error.

Richard Deeming 1-Mar-18 14:49pm

Also, the calculation for A hasn't translated correctly. In VB, ^ means to the power of, but in C#, it means Xor.

It should be:
double A = ((Amplitude * Math.Pow(2, 15)) / 1000) - 1;

Richard Deeming 1-Mar-18 14:53pm

And your for loop isn't iterating over the whole hdr array. It should be:

for (int i = 0; i < hdr.Length; i++)

(Not i < hdr.Length - 1)

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Richard Deeming · Accepted Answer · 2018-03-01T08:57:00

Here's a corrected translation of the VB.NET code, which works for me on full framework:

C#

using System;
using System.IO;
using System.Media;

static class beep
{
    public static void Beep(int Amplitude, int Frequency, int Duration)
    {
        double A = ((Amplitude * Math.Pow(2, 15)) / 1000) - 1;
        double DeltaFT = 2 * Math.PI * Frequency / 44100;
        
        int Samples = 441 * Duration / 10;
        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 i = 0; i < Samples; i++)
            {
                short sample;
                sample = Convert.ToInt16(A * Math.Sin(DeltaFT * i));
                BW.Write(sample);
                BW.Write(sample);
            }
            
            BW.Flush();
            MS.Seek(0, SeekOrigin.Begin);
            
            using (SoundPlayer SP = new SoundPlayer(MS))
            {
                SP.Stream = null;
                SP.Stream = MS;
                SP.PlaySync();
            }
        }
    }
}

Hopefully that should also work on CF. :)