# Basic info <!--- Add commit SHA used to reproduce --> - Float reference: ff4d7358 - Fixed point: f2eb9e08 # Description The quality of the stereo downmix EVS in PHA mode can be improved. The identified corrections are : Change the filter taps resolution (Q31->Q30), improve the precisions for the IR window, for the ILD & IPD smoothing in sub-bands, for the ISD counters and for ICCr. The corrections are proposed (by Orange) in the related branch. For example : With testv/spectral_test_2ch_48kHz @128kb/s, the improvements are : - MAX_ABS_DIFF : 6389 -> 3299 (-3090) - SSNR : 20,82 -> 25,54 (+4,75) With testv/stvST16c @128kb/s, the improvements are : - MAX_ABS_DIFF : 13522 -> 3526 (-9996) - SSNR : 31,05 -> 33,85 (+2,8) # Ways to reproduce The way to call the stereo downmix EVS is (for example) : <!-- Commandline or script --> ``` ./IVAS_cod -stereo_dmx_evs 128000 48 testv/spectral_test_2ch_48kHz.wav bit ./IVAS_dec 48 bit spectral_test_2ch_48kHz_128000_48-48.wav ```