PESQ语音测评

function pesq_mos= pesq_psychoacoustic_model (ref_data, ref_Nsamples, deg_data, ... deg_Nsamples ) global CALIBRATE Nfmax Nb Sl Sp global nr_of_hz_bands_per_bark_band centre_of_band_bark global width_of_band_hz centre_of_band_hz width_of_band_bark global pow_dens_correction_factor abs_thresh_power global Downsample SEARCHBUFFER DATAPADDING_MSECS Fs Nutterances global Utt_Start Utt_End Utt_Delay NUMBER_OF_PSQM_FRAMES_PER_SYLLABE global Fs Plot_Frame % Plot_Frame= 75; % this is the frame whose spectrum will be plotted FALSE= 0; TRUE= 1; NUMBER_OF_PSQM_FRAMES_PER_SYLLABE= 20; maxNsamples = max (ref_Nsamples, deg_Nsamples); Nf = Downsample * 8; MAX_NUMBER_OF_BAD_INTERVALS = 1000; start_frame_of_bad_interval= zeros( 1, MAX_NUMBER_OF_BAD_INTERVALS); stop_frame_of_bad_interval= zeros( 1, MAX_NUMBER_OF_BAD_INTERVALS); start_sample_of_bad_interval= zeros( 1, MAX_NUMBER_OF_BAD_INTERVALS); stop_sample_of_bad_interval= zeros( 1, MAX_NUMBER_OF_BAD_INTERVALS); number_of_samples_in_bad_interval= zeros( 1, MAX_NUMBER_OF_BAD_INTERVALS); delay_in_samples_in_bad_interval= zeros( 1, MAX_NUMBER_OF_BAD_INTERVALS); number_of_bad_intervals= 0; there_is_a_bad_frame= FALSE; Whanning= hann( Nf, 'periodic'); Whanning= Whanning'; D_POW_F = 2; D_POW_S = 6; D_POW_T = 2; A_POW_F = 1; A_POW_S = 6; A_POW_T = 2; D_WEIGHT= 0.1; A_WEIGHT= 0.0309; CRITERIUM_FOR_SILENCE_OF_5_SAMPLES = 500; samples_to_skip_at_start = 0; sum_of_5_samples= 0; while ((sum_of_5_samples< CRITERIUM_FOR_SILENCE_OF_5_SAMPLES) ... && (samples_to_skip_at_start < maxNsamples / 2)) sum_of_5_samples= sum( abs( ref_data( samples_to_skip_at_start... + SEARCHBUFFER * Downsample + 1: samples_to_skip_at_start... + SEARCHBUFFER * Downsample + 5))); if (sum_of_5_samples< CRITERIUM_FOR_SILENCE_OF_5_SAMPLES) samples_to_skip_at_start = samples_to_skip_at_start+ 1; end end % fprintf( 'samples_to_skip_at_start is %d\n', samples_to_skip_at_start); samples_to_skip_at_end = 0; sum_of_5_samples= 0; while ((sum_of_5_samples< CRITERIUM_FOR_SILENCE_OF_5_SAMPLES) ... && (samples_to_skip_at_end < maxNsamples / 2)) sum_of_5_samples= sum( abs( ref_data( maxNsamples - ... SEARCHBUFFER* Downsample + DATAPADDING_MSECS* (Fs/ 1000) ... - samples_to_skip_at_end - 4: maxNsamples - ... SEARCHBUFFER* Downsample + DATAPADDING_MSECS* (Fs/ 1000) ... - samples_to_skip_at_end))); if (sum_of_5_samples< CRITERIUM_FOR_SILENCE_OF_5_SAMPLES) samples_to_skip_at_end = samples_to_skip_at_end+ 1; end end % fprintf( 'samples_to_skip_at_end is %d\n', samples_to_skip_at_end); start_frame = floor( samples_to_skip_at_start/ (Nf/ 2)); stop_frame = floor( (maxNsamples- 2* SEARCHBUFFER* Downsample ... + DATAPADDING_MSECS* (Fs/ 1000)- samples_to_skip_at_end) ... / (Nf/ 2))- 1; % number of frames in speech data plus DATAPADDING_MSECS % fprintf( 'start/end frame is %d/%d\n', start_frame, stop_frame); D_disturbance= zeros( stop_frame+ 1, Nb); DA_disturbance= zeros( stop_frame+ 1, Nb); power_ref = pow_of (ref_data, SEARCHBUFFER* Downsample, ... maxNsamples- SEARCHBUFFER* Downsample+ DATAPADDING_MSECS* (Fs/ 1000),... maxNsamples- 2* SEARCHBUFFER* Downsample+ DATAPADDING_MSECS* (Fs/ 1000)); power_deg = pow_of (deg_data, SEARCHBUFFER * Downsample, ... maxNsamples- SEARCHBUFFER* Downsample+ DATAPADDING_MSECS* (Fs/ 1000),... maxNsamples- 2* SEARCHBUFFER* Downsample+ DATAPADDING_MSECS* (Fs/ 1000)); % fprintf( 'ref/deg power is %f/%f\n', power_ref, power_deg); hz_spectrum_ref = zeros( 1, Nf/ 2); hz_spectrum_deg = zeros( 1, Nf/ 2); frame_is_bad = zeros( 1, stop_frame + 1); smeared_frame_is_bad = zeros( 1, stop_frame + 1); silent = zeros( 1, stop_frame + 1); pitch_pow_dens_ref = zeros( stop_frame + 1, Nb); pitch_pow_dens_deg = zeros( stop_frame + 1, Nb); frame_was_skipped = zeros( 1, stop_frame + 1); frame_disturbance = zeros( 1, stop_frame + 1); frame_disturbance_asym_add = zeros( 1, stop_frame + 1); avg_pitch_pow_dens_ref = zeros( 1, Nb); avg_pitch_pow_dens_deg = zeros( 1, Nb); loudness_dens_ref = zeros( 1, Nb); loudness_dens_deg = zeros( 1, Nb); deadzone = zeros( 1, Nb); disturbance_dens = zeros( 1, Nb); disturbance_dens_asym_add = zeros( 1, Nb); time_weight = zeros( 1, stop_frame + 1); total_power_ref = zeros( 1, stop_frame + 1); % fid= fopen( 'tmp_mat.txt', 'wt'); for frame = 0: stop_frame start_sample_ref = 1+ SEARCHBUFFER * Downsample + frame* (Nf/ 2); hz_spectrum_ref= short_term_fft (Nf, ref_data, Whanning, ... start_sample_ref); utt = Nutterances; while ((utt >= 1) && ((Utt_Start(utt)- 1)* Downsample+ 1 ... > start_sample_ref)) utt= utt - 1; end if (utt >= 1) delay = Utt_Delay(utt); else delay = Utt_Delay(1); end start_sample_deg = start_sample_ref + delay; if ((start_sample_deg > 0) && (start_sample_deg + Nf- 1 < ... maxNsamples+ DATAPADDING_MSECS* (Fs/ 1000))) hz_spectrum_deg= short_term_fft (Nf, deg_data, Whanning, ... start_sample_deg); else hz_spectrum_deg( 1: Nf/ 2)= 0; end pitch_pow_dens_ref( frame+ 1, :)= freq_warping (... hz_spectrum_ref, Nb, frame); %peak = maximum_of (pitch_pow_dens_ref, 0, Nb); pitch_pow_dens_deg( frame+ 1, :)= freq_warping (... hz_spectrum_deg, Nb, frame); total_audible_pow_ref = total_audible (frame, pitch_pow_dens_ref, 1E2); total_audible_pow_deg = total_audible (frame, pitch_pow_dens_deg, 1E2); silent(frame+ 1) = (total_audible_pow_ref < 1E7); end % fclose( fid); avg_pitch_pow_dens_ref= time_avg_audible_of (stop_frame + 1, ... silent, pitch_pow_dens_ref, floor((maxNsamples- 2* SEARCHBUFFER* ... Downsample+ DATAPADDING_MSECS* (Fs/ 1000))/ (Nf / 2))- 1); avg_pitch_pow_dens_deg= time_avg_audible_of (stop_frame + 1, ... silent, pitch_pow_dens_deg, floor((maxNsamples- 2* SEARCHBUFFER* ... Downsample+ DATAPADDING_MSECS* (Fs/ 1000))/ (Nf/ 2))- 1); % fid= fopen( 'tmp_mat.txt', 'wt'); % fprintf( fid, '%f\n', avg_pitch_pow_dens_deg); % fclose( fid); if (CALIBRATE== 0) pitch_pow_dens_ref= freq_resp_compensation (stop_frame + 1, ... pitch_pow_dens_ref, avg_pitch_pow_dens_ref, ... avg_pitch_pow_dens_deg, 1000); if (Plot_Frame>= 0) % plot pitch_pow_dens_ref figure; subplot( 1, 2, 1); plot( centre_of_band_hz, 10* log10( eps+ ... pitch_pow_dens_ref( Plot_Frame+ 1, :))); axis( [0 Fs/2 0 95]); %xlabel( 'Hz'); ylabel( 'Db'); title( 'reference signal bark spectrum with frequency compensation'); subplot( 1, 2, 2); plot( centre_of_band_hz, 10* log10( eps+ ... pitch_pow_dens_deg( Plot_Frame+ 1, :))); axis( [0 Fs/2 0 95]); %xlabel( 'Hz'); ylabel( 'Db'); title( 'degraded signal bark spectrum'); end end % tmp1= pitch_pow_dens_ref'; MAX_SCALE = 5.0; MIN_SCALE = 3e-4; oldScale = 1; THRESHOLD_BAD_FRAMES = 30; for frame = 0: stop_frame total_audible_pow_ref = total_audible (frame, pitch_pow_dens_ref, 1); total_audible_pow_deg = total_audible (frame, pitch_pow_dens_deg, 1); total_power_ref (1+ frame) = total_audible_pow_ref; scale = (total_audible_pow_ref + 5e3)/ (total_audible_pow_deg + 5e3); if (frame > 0) scale = 0.2 * oldScale + 0.8 * scale; end oldScale = scale; if (scale > MAX_SCALE) scale = MAX_SCALE; elseif (scale < MIN_SCALE) scale = MIN_SCALE; end