| public Read ( uint length, double &l, double &r ) : int | ||
| length | uint | 読み出すサンプル数。 |
| l | double | 左チャネルのデータ格納先。 |
| r | double | 右チャネルのデータ格納先。 |
| return | int | |
static void _Main(string[] args)
{
const int N = 1024;
double[] x = new double[N];
IFilter filter = new ShelvingEqualizer(Common.Normalize(1000), 1);
// インパルス応答取得
filter.Clear();
/*
filter.GetValue(1);
for(int i=0; i<16; ++i)
filter.GetValue(0);
*/
filter.GetValue(1);
for(int i=1; i<N; ++i)
x[i] = filter.GetValue(0);
#if TIME_SEQUENCE
int n = N;
double[] t = new double[n];
for(int i=0; i<n; ++i) t[i] = i;
Graph.GraphForm gf = new Graph.GraphForm();
gf.Graph.AddEntry(t, x, new Pen(Color.Crimson));
gf.Graph.SetXAxis(0, n, 5, new Font(FontFamily.GenericSerif, 12), new SolidBrush(Color.Black));
gf.Graph.SetYAxis(0, 2, 5, new Font(FontFamily.GenericSerif, 12), new SolidBrush(Color.Black));
gf.Size = new Size(640, 480);
gf.ShowDialog();
#elif PHASE
Spectrum spec = Spectrum.FromTimeSequence(x, 1);
int n = spec.Count;
double[] t = new double[n];
for(int i=0; i<n; ++i) t[i] = i;
double[] y = spec.GetPhase();
Spectrum.Unwrap(y);
Graph.GraphForm gf = new Graph.GraphForm();
gf.Graph.AddEntry(t, y, new Pen(Color.Crimson));
gf.Graph.SetXAxis(0, n, 4, new Font(FontFamily.GenericSerif, 12), new SolidBrush(Color.Black));
gf.Graph.SetYAxis(-50, 0, 4, new Font(FontFamily.GenericSerif, 12), new SolidBrush(Color.Black));
gf.Size = new Size(640, 480);
gf.ShowDialog();
#elif GAIN
Spectrum spec = Spectrum.FromTimeSequence(x, 1);
int n = spec.Count;
double[] t = new double[n];
for(int i=0; i<n; ++i) t[i] = i;
double[] y = spec.GetAmplitude();
Graph.GraphForm gf = new Graph.GraphForm();
gf.Graph.AddEntry(t, y, new Pen(Color.Crimson));
gf.Graph.SetXAxis(0, n, 4, new Font(FontFamily.GenericSerif, 12), new SolidBrush(Color.Black));
gf.Graph.SetYAxis(0, 4, 4, new Font(FontFamily.GenericSerif, 12), new SolidBrush(Color.Black));
gf.Size = new Size(640, 480);
gf.ShowDialog();
#endif
#if false
const int N = 512;
double[] x = new double[N];
double[] x0 = new double[N];
double[] y0 = new double[N];
/*
Random rnd = new Random();
x0[0] = 1;
x0[1] = 1;
y0[0] = 0;
y0[1] = 0;
for(int i=1; i<N/2; ++i)
{
x0[2*i] = rnd.NextDouble();
x0[2*i+1] = rnd.NextDouble();
y0[2*i] = -x0[2*i+1];
y0[2*i+1] = x0[2*i];
}
Fft fft = new Fft(N);
fft.Invert(x0);
fft.Invert(y0);
for(int i=0; i<N; ++i)
x[i] = x0[i];
//*/
//*
for(int i=0; i<N; ++i)
{
x[i] = 100;
for(int k=1; k<200; ++k)
x[i] += short.MaxValue / 4 / k * Math.Cos(Math.PI / 512 * 32 * i * k);
x0[i] = x[i];
y0[i] = 0;
for(int k=1; k<200; ++k)
y0[i] += short.MaxValue / 4 / k * Math.Sin(Math.PI / 512 * 32 * i * k);
}
//*/
double[] y = Spectrum.HilbertTransform(x);
using(StreamWriter writer = new StreamWriter("z.csv", false, Encoding.Default))
{
/*
for(int i=0; i<x.Length; ++i)
writer.Write("{0},{1},{2},{3},{4}\n", i, x0[i], x[i], y0[i], y[i]);
//*/
//*
Spectrum a0 = Spectrum.FromTimeSequence(x0);
Spectrum a = Spectrum.FromTimeSequence(x);
Spectrum b0 = Spectrum.FromTimeSequence(y0);
Spectrum b = Spectrum.FromTimeSequence(y);
for(int i=0; i<a.Count; ++i)
{
writer.Write("{0},{1},{2},{3},{4}\n", i, a0[i].Abs, a[i].Abs, b0[i].Abs, b[i].Abs);
// writer.Write("{0},{1},{2},{3},{4}\n", i, a0[i].Arg, a[i].Arg, b0[i].Arg, b[i].Arg);
}
//*/
}
#elif false
const int N = 1024;
double[] lp = new double[N];
IFilter lpf = new LowPassFir(16, Common.Normalize(2000));
lp[0] = lpf.GetValue(1);
for(int i=1; i<N; ++i) lp[i] = lpf.GetValue(0);
double[] bp = new double[N];
IFilter bpf = new BandPassFir(16, Common.Normalize(2000), Common.Normalize(8000));
lp[0] = bpf.GetValue(1);
for(int i=1; i<N; ++i) bp[i] = bpf.GetValue(0);
double[] hp = new double[N];
IFilter hpf = new HighPassFir(16, Common.Normalize(8000));
lp[0] = hpf.GetValue(1);
for(int i=1; i<N; ++i) hp[i] = hpf.GetValue(0);
Fft fft = new Fft(N);
fft.Transform(1, lp);
fft.Transform(1, bp);
fft.Transform(1, hp);
using(StreamWriter writer = new StreamWriter("z.csv", false, Encoding.Default))
{
double la = Common.Amp(lp[0]);
double ba = Common.Amp(bp[0]);
double ha = Common.Amp(hp[0]);
writer.Write("{0},{1},{2},{3}\n", 0, la, ba, ha);
for(int i=1; i<N/2; ++i)
{
la = Common.Amp(lp[2*i] * lp[2*i] + lp[2*i+1] * lp[2*i+1]);
ba = Common.Amp(bp[2*i] * bp[2*i] + bp[2*i+1] * bp[2*i+1]);
ha = Common.Amp(hp[2*i] * hp[2*i] + hp[2*i+1] * hp[2*i+1]);
writer.Write("{0},{1},{2},{3}\n", i, la, ba, ha);
}
la = Common.Amp(lp[1]);
ba = Common.Amp(bp[1]);
ha = Common.Amp(hp[1]);
writer.Write("{0},{1},{2},{3}\n", N/2, la, ba, ha);
}
#elif false
uint length;
double[] l;
double[] r;
FormatHeader header;
using(WaveReader reader = new WaveReader(@"TD100V00H030.wav"))
{
header = reader.Header;
length = reader.Length;
int tmp = reader.Read(length, out l, out r);
}
IFilter lpf = new LowPassFir(16, Common.Normalize(4500));
IFilter bpf = new BandPassFir(16, Common.Normalize(4500), Common.Normalize(10000));
IFilter hpf = new HighPassFir(16, Common.Normalize(10000));
for(int i=0; i<l.Length; ++i)
{
double lp = lpf.GetValue(l[i]);
double bp = bpf.GetValue(l[i]);
double hp = hpf.GetValue(l[i]);
l[i] = lp + bp + hp;
}
if(r != null)
for(int i=0; i<l.Length; ++i)
{
double lp = lpf.GetValue(r[i]);
double bp = bpf.GetValue(r[i]);
double hp = hpf.GetValue(r[i]);
r[i] = lp + bp + hp;
}
using(WaveWriter writer = new WaveWriter("z.wav", header))
{
writer.Write(l, r);
}
#elif false
using(StreamWriter writer = new StreamWriter("z.csv", false, Encoding.Default))
{
for(int i=0; i<l.Length; ++i)
{
writer.Write("{0},{1},{2}\n", i, l[i], r[i]);
}
}
#endif
}
}//Read
/// <summary>
/// ファイルから Wave データを読み出し。
/// </summary>
/// <param name="filename">ファイル名</param>
/// <param name="length">読み込む長さ</param>
/// <param name="skip">ファイルの先頭を読み飛ばす長さ</param>
/// <param name="threshold">閾値。この値以下の音は無音とみなす</param>
/// <param name="relative">閾値にピーク値からみた相対値を使う</param>
/// <returns>読み出したデータ</returns>
static WaveData Read(
string filename, int skip, int length,
double threshold ,bool relative)
{
WaveReader reader = null;
FormatHeader header;
double[] l;
double[] r;
using(reader = new WaveReader(filename))
{
header = reader.Header;
reader.Skip(0);
reader.Read(reader.Length, out l, out r);
}
if(relative) threshold *= Math.Max(GetPeekValue(l), GetPeekValue(r));
skip += Math.Min(GetSilentLength(l, threshold), GetSilentLength(r, threshold));
if(skip < 0 || skip + length >= l.Length) skip = 0;
return new WaveTime(header, CopyArray(l, skip, length), CopyArray(r, skip, length));
}//Read
}//Read
/// <summary>
/// ファイルから Wave データを読み出し。
/// </summary>
/// <param name="filename">ファイル名</param>
/// <param name="length">読み込む長さ</param>
/// <param name="skip">ファイルの先頭を読み飛ばす長さ</param>
/// <param name="threshold">閾値。この値以下の音は無音とみなす</param>
/// <param name="relative">閾値にピーク値からみた相対値を使う</param>
/// <param name="type">リファレンスのタイプ</param>
/// <returns>読み出したデータ</returns>
static WaveData Read(
string filename, int skip, int length,
double threshold ,bool relative, ReferenceType type)
{
WaveReader reader = null;
FormatHeader header;
double[] l;
double[] r;
using(reader = new WaveReader(filename))
{
header = reader.Header;
// R ch を使いたいのに wave ファイルがモノラルの場合
if(type != ReferenceType.Left && reader.Header.ch == 1)
{
return new WaveTime();
}
reader.Skip(0);
reader.Read(reader.Length, out l, out r);
}
if(type == ReferenceType.Left)
{
if(relative) threshold *= GetPeekValue(l);
skip += GetSilentLength(l, threshold);
}
else if(type == ReferenceType.Right)
{
if(relative) threshold *= GetPeekValue(r);
skip += GetSilentLength(r, threshold);
}
else
{
if(relative) threshold *= Math.Max(GetPeekValue(l), GetPeekValue(r));
skip += Math.Min(GetSilentLength(l, threshold), GetSilentLength(r, threshold));
}
if(skip < 0 || skip + length >= l.Length) skip = 0;
return new WaveTime(header, CopyArray(l, skip, length), CopyArray(r, skip, length));
}//Read
/// <summary>
/// ファイルから Wave データを読み出し。
/// </summary>
/// <param name="filename">ファイル名</param>
/// <param name="length">読み込む長さ</param>
/// <param name="skip">ファイルの先頭を読み飛ばす長さ</param>
/// <returns>読み出したデータ</returns>
static WaveData Read(string filename, int skip, int length)
{
WaveReader reader = null;
FormatHeader header;
double[] l;
double[] r;
using(reader = new WaveReader(filename))
{
header = reader.Header;
reader.Skip(skip);
reader.Read((uint)length, out l, out r);
}
return new WaveTime(header, l, r);
}//Read