基于MATLAB的语音信号LPC实时分析输出以及基频实时估计仿真+代码仿真操作视频

clc; clear; close all; warning off; addpath(genpath(pwd)); %**************************************************************************** %更多关于matlab和fpga的搜索“fpga和matlab”的CSDN博客: %matlab/FPGA项目开发合作 %https://blog.csdn.net/ccsss22?type=blog %**************************************************************************** [y, fs] = audioread('jobs.wav'); y = y(:,1); % mono, left channel only y = y/max(abs(y(:)))*1.0; %normalize y_full = zeros(size(y)); % pre-allocate zeros y_inv_full = zeros(size(y)); residue_full = zeros(size(y)); glottal_full = zeros(size(y)); lengthOfThroat = 5.5; %inches speedOfSoundInches = 13397; % inches per second samplesPerInch = fs / speedOfSoundInches; order = round(samplesPerInch*lengthOfThroat); order = 30; % lpc order window_size = 256; % hop_size = window_size-order; hop_size = window_size/2; y_length = length(y); y_start = 1; y_end = length(y) - window_size; theWindow = hann(window_size).^0.5; for loops = 1:1 for frame_start = y_start:hop_size:y_end t_frame = frame_start:frame_start+window_size-1; % times for this frame t_frame_sec = t_frame/fs; % times for this frame y_frame = y(t_frame).*theWindow; % signal for this frame A = lpc(y_frame, order); B = [1]; y_inv_frame = filter(A,B,y_frame); residue = y_frame - y_inv_frame; % the residue glottal = filter(B, A, residue); % actual glottal pulse? % write into files y_full(t_frame) = y_full(t_frame) + y_frame.*theWindow; y_inv_full(t_frame) = y_inv_full(t_frame) + y_inv_frame.*theWindow; residue_full(t_frame) = residue_full(t_frame) + residue.*theWindow; glottal_full(t_frame) = glottal_full(t_frame) + glottal.*theWindow; bins = 0:length(y_frame)/2; % y spectrum Y_frame = fft(y_frame); Y_frame_magnitude = abs(Y_frame); Y_frame_magnitude_max = max(max(Y_frame_magnitude(:), 1)); Y_frame_magnitude_dB = 20*log10(Y_frame_magnitude/Y_frame_magnitude_max); Y_frame_magnitude_dB_pos = Y_frame_magnitude_dB(1:end/2+1); % y inverse filtered spectrum Y_inv_frame = fft(y_inv_frame); Y_inv_frame_magnitude = abs(Y_inv_frame); Y_inv_frame_magnitude_max = max(max(Y_inv_frame_magnitude(:), 1)); Y_inv_frame_magnitude_dB = 20*log10(Y_inv_frame_magnitude/Y_inv_frame_magnitude_max); Y_inv_frame_magnitude_dB_pos = Y_inv_frame_magnitude_dB(1:end/2+1); % residue spectrum RESIDUE = fft(residue); RESIDUE_magnitude = abs(RESIDUE); RESIDUE_magnitude_max = max(max(RESIDUE_magnitude(:), 1)); RESIDUE_magnitude_dB = 20*log10(RESIDUE_magnitude/RESIDUE_magnitude_max); RESIDUE_magnitude_dB_pos = RESIDUE_magnitude_dB(1:end/2+1); % actual glottal pulse? GLOTTAL = fft(glottal); GLOTTAL_magnitude = abs(GLOTTAL); GLOTTAL_magnitude_max = max(max(GLOTTAL_magnitude(:), 1)); GLOTTAL_magnitude_dB = 20*log10(GLOTTAL_magnitude/GLOTTAL_magnitude_max); GLOTTAL_magnitude_dB_pos = GLOTTAL_magnitude_dB(1:end/2+1); figure(1); subplot(4,4,1:4); t = (1:length(y))/fs; % time values plot(t, y); title('Signal'); xlabel('time (seconds)'); ylabel('amplitude'); axis tight; ylim([-1, 1]); rectangle_bounds = [frame_start/fs, -1, (hop_size-1)/fs, 2]; rectangle('Position', rectangle_bounds, 'EdgeColor', 'r'); % current frame subplot(4,4,5); plot(t_frame_sec, y_frame); title('Current Frame'); xlabel('time (seconds)'); ylabel('amplitude'); axis tight; ylim([-1, 1]); subplot(4,4,9); plot(bins, Y_frame_magnitude_dB_pos); title('Current Frame Spectrum'); xlabel('bin'); ylabel('amplitude(dB)'); axis tight; ylim([-60 0]); % current frame, inverse filtered subplot(4,4,6); plot(t_frame_sec, y_inv_frame); title('w/o Formant'); xlabel('time (seconds)'); ylabel('amplitude'); axis tight; ylim([-1, 1]); subplot(4,4,10); plot(bins, Y_inv_frame_magnitude_dB_pos); title('Spectrum, w/o Formant'); xlabel('bin'); ylabel('amplitude(dB)'); axis tight; ylim([-60 0]); % current frame, residue subplot(4,4,7); plot(t_frame_sec, residue); title('Residue'); xlabel('time (seconds)'); ylabel('amplitude'); axis tight; ylim([-1, 1]); subplot(4,4,11); plot(bins, RESIDUE_magnitude_dB_pos); title('Spectrum, Residue'); xlabel('bin'); ylabel('amplitude(dB)'); axis tight; ylim([-60 0]); % current frame, actual glottal? subplot(4,4,8); plot(t_frame_sec, glottal); title('Glottal Pulse estimate?'); xlabel('time (seconds)'); ylabel('amplitude'); axis tight; ylim([-1, 1]); subplot(4,4,12); plot(bins, GLOTTAL_magnitude_dB_pos); title('Spectrum, Glottal Pulse estimate?'); xlabel('bin'); ylabel('amplitude(dB)'); axis tight; ylim([-60 0]); % coefficients subplot(4,4,13:16); A_plot = (A + 1) /2; % process A coefficients for plotting A_plot = (A_plot < 0.0)*0.0 + (A_plot >= 0.0).*(A_plot); %hacky? coeffNums = 1:length(A_plot); plot(coeffNums, A_plot, coeffNums, -A_plot); set(gca, 'XTick', []); set(gca, 'YTick', []); set(gca, 'XTickLabelMode', 'manual', 'XTickLabel', []); set(gca, 'YTickLabelMode', 'manual', 'YTickLabel', []); xlim([min(coeffNums)-1, max(coeffNums)+1]); ylim([-1, 1]); end end % normalize y_full = 0.9 * y_full./max(y_full(:)); y_inv_full = 0.9 * y_inv_full./max(y_inv_full(:)); residue_full = 0.9 * residue_full./max(residue_full(:)); glottal_full = 0.9 * glottal_full./max(glottal_full(:));