A method and apparatus for compressing signals in a fixed...

G - Physics – 06 – F

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G06F 5/01 (2006.01) G06F 7/48 (2006.01)

Patent

CA 2340421

A method and apparatus for compressing fixed point signals without introducing a bias. Signals are compressed according to a dithered rounding approach wherein signal values are rounded up and rounded down with approximately equal probability, canceling the bias that would otherwise result from the rounding operation. Numerical properties of the input signal are exploited in order to determine whether the signal value should be rounded up or down. Signal compression may, therefore, be introduced at multiple points within a system without accumulating a signal bias and degrading downstream performance. Further, one bit signal compression may be achieved in a particularly efficient fashion with a minimal amount of hardware.

L'invention concerne un procédé et un appareil de compression de signaux en point fixe sans introduire de distorsion. Les signaux sont comprimés selon une méthode d'arrondissement par vibration, les valeurs des signaux étant arrondies au chiffre supérieur et arrondies au chiffre inférieur avec une probabilité approximativement égale, ce qui annule la distorsion qui pourrait découler de l'opération d'arrondissement. On exploite les propriétés numériques du signal d'entrée afin de déterminer si la valeur du signal doit être arrondie au chiffre supérieur ou au chiffre inférieur. On peut donc introduire une compression de signaux à des points multiples dans un système sans accumuler une distorsion des signaux et dégrader les performances en aval. En outre, on peut effectuer une compression de signaux à un bit de manière particulièrement efficace avec une quantité minimale de matériel.

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