matlab-(含教程)基于ZCR过零检测法的语音信号端点检测matlab仿真

clc; clear; close all; warning off; addpath(genpath(pwd)); input_audio = 'sample.wav'; [y,Fs] = audioread(input_audio); y = y * 2.^15; % original values into integer n_samples = length(y); frame_length = Fs/40; % Assuming Fs is integer. % Frame length of 400 ms (for Fs = 16 kHz) trailing_samples = mod(n_samples, frame_length); frames = reshape( y(1:end-trailing_samples), frame_length, []); n_frames = length(frames(1,:)); % -------------------------Zero-Crossing Rate----------------------------- [ zcr ] = ZCR( y, frames, n_frames, Fs ); % -----------------------Hamming Windowing-------------------------------- h = hamming(frame_length); h = repmat(h,1,n_frames); w = frames.*h; w_reshaped = reshape(w, 1, frame_length*n_frames); % signal figure; subplot(2,1,1); plot(y); ylabel('Amplitude'); title('Audio input'); subplot(2,1,2); plot(w_reshaped, '.-'); xlabel('time'); ylabel('Amplitude'); title('Windowed signal'); energy = sum(w.^2); figure; subplot(2,1,1); plot(y); ylabel('Amplitude'); title('Audio input'); subplot(2,1,2); plot(energy, '.-'); xlabel('time'); ylabel('Energy (J)'); title('Signal energy');