Method and apparatus for reducing quantization noise

Details Method and apparatus for reducing quantization noise Method and apparatus for reducing quantization noise

H - Electricity

03

H

H03H 17/02 (2006.01) H04B 1/26 (2006.01) H04L 1/06 (2006.01) H04L 1/22 (2006.01) H04Q 7/30 (2006.01)

Patent

CA 2185026

In a quantization noise reduction circuit (200), a feedback signal (W) is added to an input signal (X) to the quantization circuit to reduce quantization noise. The feedback signal is generated as a filtered difference between a sample of an N bit signal (X') and a time coincident sample of an M bit quantized signal, where M < N. The feedback signal is subtracted from the input signal (X) prior to quantization thereby introducing out of band noise into the input signal for reducing in band noise in the quantized signal (Y).

Dans un circuit de réduction du bruit de quantification (200), un signal de rétroaction (W) est ajouté à un signal d'entrée (X) dans le circuit de quantification afin de réduire le bruit de quantification. Le signal de rétroaction est généré en tant que différence de filtrage entre l'échantillon d'un signal (X') à N bits et un échantillon à coïncidence temporelle d'un signal quantifié à M bits où M < N. Le signal de rétroaction est déduit du signal d'entrée (X) avant la quantification, ce qui permet d'introduire du bruit hors bande dans le signal d'entrée afin de réduire le bruit de bande dans le signal quantifié (Y).

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