淘宝网站开发技术名称,小公司做网站的实力,免费咨询骨科医生回答在线,mvc 网站开发Matlab v_melbankm函数参数详解(英文附例)笔者使用的是R2019的matlab#xff0c;下载了voicebox安装至matlab路径下即可使用。下载voicebox请参看此博客需要注意的是#xff0c;melbankm改成了v_melbankm#xff0c;今天自己使用此函数时后面几个参数不知道含义#xff0c;…Matlab v_melbankm函数参数详解(英文附例)笔者使用的是R2019的matlab下载了voicebox安装至matlab路径下即可使用。下载voicebox请参看此博客需要注意的是melbankm改成了v_melbankm今天自己使用此函数时后面几个参数不知道含义翻了源文件看看比较懒没翻译成中文。看到一篇更好的解释和与v_melcepst的比较博客请戳这里函数解释v_melbankm determine matrix for a mel/erb/bark-spaced v_filterbank [X,MN,MX](P,N,FS,FL,FH,W)Inputs:p number of filters in v_filterbank or the filter spacing in k-mel/bark/erb [ceil(4.6*log10(fs))]n length of fftfs sample rate in Hzfl low end of the lowest filter as a fraction of fs [default 0]fh high end of highest filter as a fraction of fs [default 0.5]w any sensible combination of the following:‘b’ bark scale instead of mel‘e’ erb-rate scale‘l’ log10 Hz frequency scale‘f’ linear frequency scale‘c’ fl/fh specify centre of low and high filters‘h’ fl/fh are in Hz instead of fractions of fs‘H’ fl/fh are in mel/erb/bark/log10‘t’ triangular shaped filters in mel/erb/bark domain (default)‘n’ hanning shaped filters in mel/erb/bark domain‘m’ hamming shaped filters in mel/erb/bark domain‘z’ highest and lowest filters taper down to zero [default]‘y’ lowest filter remains at 1 down to 0 frequency and highest filter remains at 1 up to nyquist freqency‘u’ scale filters to sum to unity‘s’ single-sided: do not double filters to account for negative frequencies‘g’ plot idealized filters [default if no output arguments present]Note that the filter shape (triangular, hamming etc) is defined in the mel (or erb etc) domain.Some people instead define an asymmetric triangular filter in the frequency domain.If ‘ty’ or ‘ny’ is specified, the total power in the fft is preserved.Outputs:x a sparse matrix containing the v_filterbank amplitudesIf the mn and mx outputs are given then size(x)[p,mx-mn1]otherwise size(x)[p,1floor(n/2)]Note that the peak filter values equal 2 to account for the powerin the negative FFT frequencies.mc the v_filterbank centre frequencies in mel/erb/barkmn the lowest fft bin with a non-zero coefficientmx the highest fft bin with a non-zero coefficientNote: you must specify both or neither of mn and mx.Examples of use:(a) Calcuate the Mel-frequency Cepstral Coefficientsfv_rfft(s); % v_rfft() returns only 1floor(n/2) coefficientsxv_melbankm(p,n,fs); % n is the fft length, p is the number of filters wantedzlog(x*abs(f).^2); % multiply x by the power spectrumcdct(z); % take the DCT(b) Calcuate the Mel-frequency Cepstral Coefficients efficientlyffft(s); % n is the fft length, p is the number of filters wanted[x,mc,na,nb]v_melbankm(p,n,fs); % na:nb gives the fft bins that are neededzlog(x*(f(na:nb)).*conj(f(na:nb)));© Plot the calculated filterbanksplot((0:floor(n/2))*fs/n,melbankm(p,n,fs)) % fssample frequency(d) Plot the idealized filterbanks (without output sampling)v_melbankm(p,n,fs);References:[1] S. S. Stevens, J. Volkman, and E. B. Newman. A scale for the measurementof the psychological magnitude of pitch. J. Acoust Soc Amer, 8: 185-19, 1937.[2] S. Davis and P. Mermelstein. Comparison of parametric representations formonosyllabic word recognition in continuously spoken sentences.IEEE Trans Acoustics Speech and Signal Processing, 28 (4): 357-366, Aug. 1980.
