﻿ c# – 帮助实现这种节拍检测算法？ - 代码日志

#### c# – 帮助实现这种节拍检测算法？

``````//Cycle through Tempo's (60 to 200) incrementing each time by 10
for (int i = (int)mintempo; i <= maxtempo; i += 10)
{
//Clear variables to be used
curtempo = i;
fftPulse.Clear();
offset = 0;
energy = 0;
short[] prevBuffer = null;

//Calculate ti
ti = (60 / curtempo) * 44100;
ti = Math.Round(ti, 0);

//Generate pulse train
for (int j = 0; j < pulseTrain.Length; j++)
{
if ((j % ti) == 0)
pulseTrain[j] = short.MaxValue;
else
pulseTrain[j] = 0;
}

//Compute FFT of the pulseTrain array
while (offset < pulseTrain.Length)
{
//Generate block samples (1024 is my blocksize)
short[] fftPulseBuffer = new short[po.blocksize / 2];

//Store samples from pulseTrain in a 1024 block buffer for passing to the FFT algorithm
index = 0;
for (int j = offset; j < (offset + (po.blocksize / 2)) && j < pulseTrain.Length; j++)
{
fftPulseBuffer[index] = pulseTrain[j];
index++;
}

//Initialize prevBuffer, which contains samples from the previous block, used in conjunction with the current block for the FFT
if (prevBuffer == null)
prevBuffer = new short[po.blocksize / 2];

//Calculate the FFT using the current and previous blocks

//Set prevBuffer and increment to next block start position
prevBuffer = fftPulseBuffer;
offset += (po.blocksize / 2);
}

//Calculate energy
for (int j = 0; j < intendomainarr.Count; j++)
{
double[] signalarr = intendomainarr[j];
double[] pulsearr = fftPulse[j];
for (int x = 0; x < signalarr.Length; x++)
{
energy += Math.Abs(signalarr[x] * pulsearr[x]);
}
}

//Get current best tempo match
if (energy > maxenergy)
{
chosentempo = curtempo;
maxenergy = energy;
}
}
``````