resample matlab实现

Posted 2021-01-17 fellow1988

使用线性插值实现sample rate转换。

function output = simpleResample(input, inputfs, outputfs)

inputLen = length(input(:, 1));

outputLen = floor(inputLen * outputfs / inputfs);

output = zeros(outputLen, 1);

timeStep = inputfs / outputfs;

curTime = 1;

integer = 0;

frac = 0;

for i = 1:1:outputLen

　　integer = floor(curTime)

　　frac = curTime - floor(curTime);

　　if integer + 1 < inputLen

　　　　output(i, 1) = input(integer, 1) + frac * ( input(integer + 1, 1) - input(integer, 1));　　

　　end

　　curTime = curTime + timeStep;

end

win = fir1(13, 0.6, ‘low‘)

output = filter(win, 1, output);

end