Figure 5
From: Wide-Band Audio Coding Based on Frequency-Domain Linear Prediction
Time-frequency characteristics obtained from a randomly selected audio example: (a) 1000 ms segment of the Hilbert envelope (estimated from the squared magnitude of an analytic signal) computed for the 3rd QMF sub-band, and its FDLP approximation (b) magnitude Fourier spectral components of the 200 ms subsegment of the sub-band FDLP residual signal and its reconstructed version, adaptive thresholds for DPQ (5, 4 bits) are also shown (c) phase Fourier spectral components of the 200 ms subsegment of the sub-band FDLP residual signal and its reconstructed version and (d) original 200 ms subsegment of the sub-band FDLP residual signal and its reconstructed version.