Dither noise source with notched frequency spectrum

Details Dither noise source with notched frequency spectrum Dither noise source with notched frequency spectrum

G - Physics

06

F

G06F 1/02 (2006.01) H03M 1/06 (2006.01) H04B 1/10 (2006.01)

Patent

CA 2325549

A dither signal source generates a dither signal which is spectrally shaped in a desired manner. One or more notches are located at desired frequencies while minimising the hardware required in a digital signal processor for generating the digital random noise for the dither signal source. The notched dither signal can be added to an analogue signal prior to digitisation to reduce quantisation distortion without adding noise to the frequency range of interest.

Une source de signal de superposition produit un signal de superposition dont le spectre respecte une forme voulue. Une ou plusieurs discontinuités se produisent à des fréquences requises. On a ainsi besoins de moins de ressources matérielles de processeur de signaux numériques pour engendrer le bruit numérique aléatoire destiné à la source de signal de superposition. Le signal de superposition discontinu peut être ajouté à un signal analogique avant numérisation, ce qui permet de réduire la distorsion de quantification sans ajouter de bruit à la plage de fréquences considérée.

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