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POHow to handle floating point overflow?
 

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  1. POHow to handle floating point overflow?
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    <p>I'm trying to do filtering .wav sample data value using the HAAR formula but got error "floating point overflow"</p> <p>Edited : add more code </p> <pre><code>numsamples := round(wavehdr.SampleRate); SetLength(wavedata[0].Data, numsamples); Stream.Read(wavedata[0].Data[0], numsamples); SetLength(cA1, numsamples); SetLength(cD1, numsamples); for i:=1 to numsamples-1 do begin cA1[i]:=(wavedata[0].Data[(i*2)-1]*0.7071) + (wavedata[0].Data[(i*2)]*0.7071); cD1[i]:=(wavedata[0].Data[(i*2)-1]*0.7071) + (wavedata[0].Data[(i*2)]*-0.7071); end; </code></pre> <p>where wavedata[0].Data[i], i get it from function Stream.Read to load sample data value of .wav file. I don't know why i got the error or what the error means and i've been searching the error mostly caused of divizion by zero, but there is no divizion by zero in my code. So maybe i could some help here what is the error mean in my code?</p> <p>EDIT 1: (i'm really new to delphi, this code is not mine i found it internet. In my understanding the following code is the one to read .wav file sample data value)</p> <pre><code>type TWaveHeader = packed record Marker_RIFF: array [0..3] of char; ChunkSize: cardinal; Marker_WAVE: array [0..3] of char; Marker_fmt: array [0..3] of char; SubChunkSize: cardinal; FormatTag: word; { nChannels : 1 mono, 2 stereo } NumChannels: word; SampleRate: longint; BytesPerSecond: longint; BytesPerSample: word; BitsPerSample: word; Marker_data: array [0..3] of char; DataBytes: longint; end; TChannel = record Data : array of double; end; </code></pre> <p>And a private declaration :</p> <pre><code>private wavehdr:TWaveHeader; </code></pre> <p>the function :</p> <pre><code>FillChar(wavehdr, sizeof(wavehdr),0); Stream.Read(wavehdr,sizeof(wavehdr)); </code></pre> <p>i modified a bit of the code to handle null value while reading the sample data :</p> <pre><code> if(IsNan(wavedata[0].Data[(i*2)-1])) then begin wavedata[0].Data[(i*2)-1]:=0; end else if(IsNan(wavedata[0].Data[(i*2)])) then begin wavedata[0].Data[(i*2)]:=0; end; </code></pre>
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    1. USWawan Ma-chun
    1. USWawan Ma-chun
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      1. POHow to handle floating point overflow?
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    1. COhow are cA1, cD1 and wavedata[0].Data declared?
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    2. COcA1 cD1 and wavedata were all array of double. which wavedata array may contain value like : 0, 1.98E-04, etc (it's the value of sample .wav data)
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      1. USWawan Ma-chun
    3. COresult is to big to be kept in your float try to understand uses Math; procedure TForm6.Button1Click(Sender: TObject); var f:Double; begin f := MaxDouble; f := F * 2; Showmessage(FloatToStr(F)) end;
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