wie kann ich viele kurze töne schnell hintereinander spielen

[igel457]

Das musst du einfach in eine WAV Datei schreiben.

Delphi-Quellcode:

procedure MakeSound(Duration{mSec}: Integer);
  {writes tone to memory and plays it}
var
  WaveFormatEx: TWaveFormatEx;
  MS: TMemoryStream;
  i, TempInt, DataCount, RiffCount: integer;
  SoundValue: byte;
  w: double; // omega ( 2 * pi * frequency)
const
  Mono: Word = $0001;
  SampleRate: Integer = 11025; // 8000, 11025, 22050, or 44100 <--Hier Samplerate einsetzen
  RiffId: string = 'RIFF';
  WaveId: string = 'WAVE';
  FmtId: string = 'fmt ';
  DataId: string = 'data';
begin
  with WaveFormatEx do
  begin
    wFormatTag := WAVE_FORMAT_PCM;
    nChannels := Mono;
    nSamplesPerSec := SampleRate;
    wBitsPerSample := $0032;
    nBlockAlign := (nChannels * wBitsPerSample) div 8;
    nAvgBytesPerSec := nSamplesPerSec * nBlockAlign;
    cbSize := 0;
  end;
  MS := TMemoryStream.Create;
  with MS do
  begin
    {Calculate length of sound data and of file data}
    DataCount := (Duration * SampleRate) div 1000; // sound data
    RiffCount := Length(WaveId) + Length(FmtId) + SizeOf(DWORD) +
      SizeOf(TWaveFormatEx) + Length(DataId) + SizeOf(DWORD) + DataCount; // file data
    {write out the wave header}
    Write(RiffId[1], 4); // 'RIFF'
    Write(RiffCount, SizeOf(DWORD)); // file data size
    Write(WaveId[1], Length(WaveId)); // 'WAVE'
    Write(FmtId[1], Length(FmtId)); // 'fmt '
    TempInt := SizeOf(TWaveFormatEx);
    Write(TempInt, SizeOf(DWORD)); // TWaveFormat data size
    Write(WaveFormatEx, SizeOf(TWaveFormatEx)); // WaveFormatEx record
    Write(DataId[1], Length(DataId)); // 'data'
    Write(DataCount, SizeOf(DWORD)); // sound data size
    {calculate and write out the tone signal} // now the data values
    w := 2 * Pi * Frequency; // omega
    for i := 0 to ListBox1.Count-1 do
    begin
      Write(StrToFloat(ListBox1.Items[i]),32);
    end;
    {now play the sound}
    sndPlaySound(MS.Memory, SND_MEMORY or SND_SYNC);
    MS.Free;
  end;
end;

Du musst halt ein wenig mit der Sample-Größe und der Frequenz spielen.