English to French Tech/Engineering Patents traitement de signaux

In an unclaimed aspect, a transmission system comprises an encoder comprising a lossless bandsplitter and a decoder comprising a lossless bandjoiner,
wherein the bandsplitter and bandjoiner each contain an allpass filter comprising a dithered quantiser,
wherein the transmission system also provides synchronised dither for a quantiser in the bandsplitter and a quantiser in the bandjoiner.
In this way, the quantisations in the bandsplitter benefit from the use of dither whilst the synchronisation preserves the lossless behaviour of the combined system. Those quantisations are audible if the bandsplit signal is listened to directly.

The filters were second order with coefficients k1=0.8365625224 and k2=0.09327361235 as given earlier, and their respective quantisers were dithered with the same ‘RPDF’ dither having a rectangular probability density function and a peak-to-peak amplitude equal to one 10 quantisation step.