Device for the generation of analog signals through...

H - Electricity – 03 – M

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H03M 1/66 (2006.01) G06F 1/03 (2006.01) H03M 7/00 (2006.01)

Patent

CA 2239581

A device for the generation of analog signals by means of analog-digital converters comprises a block for the generation of words encoded on N bits and an analog-digital converter whose input is encoded on M bits, M being smaller than N. The device furthermore comprises a sigma-delta modulator, at the output of the first block, the bus being separated into M most significant bits reserved for the input of the analog-digital converter andN-M least significant bits that enter the sigma-delta modulator, the output of this modulator being an M-bit bus that is added to the M output bits of the word generation block by digital addition means, M being smaller than N. Application especially to digital synthesizerss.

L'invention est un dispositif de génération de signaux analogiques au moyen de convertisseurs analogiques-numériques qui comporte un bloc de génération de mots codés sur N bits et un convertisseur analogique-numérique dont le signal d'entrée est codé sur M bits, M étant inférieur à N. Ce dispositif comprend de plus un modulateur sigma-delta monté à la sortie du premier bloc, le bus étant séparé en M bits de poids fort réservés au signal d'entrée du convertisseur analogique-numérique et en N - M bits de poids faible qui sont introduits dans le modulateur sigma-delta, la sortie de ce modulateur étant un bus à M bits qui sont ajoutés aux M bits de sortie du bloc de génération de mots par un dispositif d'addition numérique, M étant inférieur à N. Le dispositif de l'invention est particulièrement utile aux synthétiseurs numériques.

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