Recently, a new type Sigma Delta Modulator (SDM), a Trellis Noise-Shaping Converter, has been introduced in  as a 1-bit digital audio stream generator. This type has several advantages compared to standard SDM, including better performance in stability, signal to noise ratio, linearity and prevention of oscillation. A major drawback of the trellis architecture is the large amount of computations and memory usage compared to standard architecture. An efficient trellis implementation will be introduced resulting in a significant decrease of the number of computations and memory with hardly any change in the converter's performance. Hiroshi Kato, 'Trellis Noise Shaping Converters, Architecture and Evaluation', Technical Report of IEICE, Vol. 101, No. 381, 65-72, EA2001-59 (2001)
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