Decoder for a trellis encoded signal corrupted by ntsc...

H - Electricity – 03 – D

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H03D 1/04 (2006.01) H03K 5/02 (2006.01) H03M 13/23 (2006.01) H04B 1/10 (2006.01) H04L 25/08 (2006.01)

Patent

CA 2239889

A receiver for decoding encoded data transmitted by a transmitting station including (i) sum (50) and difference (46) filters for filtering the encoded data (R(n)) and providing corresponding sum (V(n)) and difference (U(n)) filtered outputs, (ii) first and second variable amplifiers (54 and 56) for respectively controlling the sum and difference filtered outputs so as to provide corresponding sum and difference controlled filtered outputs that vary along a continuum in order to suppress co-channel interference and white Gaussian noise in the encoded data, and (iii) a Viterbi decoder (58) for decoding the sum and difference controlled filtered output to recover uncoded data.

Un récepteur, permettant de décoder des données codées émises par une station émettrice, comprend (i) des filtres de sommation (50) et de soustraction (46), qui filtrent les données codées (R(n)) et produisent des sorties de sommation (V(n)) et de soustraction (U(n)) filtrées correspondantes; (ii) un premier et un second amplificateur à gain variable (54, 56), qui commandent les sorties de sommation et de soustraction filtrées, de façon à produire des sorties de sommation et de soustraction filtrées commandées qui varient en continu afin de supprimer les interférences dans un même canal et le bruit blanc gaussien dans les données codées; et (iii) un décodeur de Viterbi (58), qui décode les sorties de sommation et de soustraction filtrées commandées afin de récupérer les données non codées.

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