Adaptive signal processing algorithms using sigma delta architectures

• Autores: Jaume Juni Estany, Robert W. Stewart
• Localización: Input: revista divulgativa de tecnologies d'informació i gestió de recursos de l'Escola d'Enginyeria la Salle (EUETT-ETTSEI), ISSN 1134-3281, Nº. 10, 1996, págs. 54-58
• Idioma: inglés
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• Resumen

  • Using oversampled sigma-delta techniques a signal can be represented as a single bit binary data stream, sith the quanitzation noise high pass filtered out of baseband. In this paper adaptive filter weights at the oversampled rate to realize architectures that are very suitable for mixed analog/digital VLSI implementation. Using the adaptive architecture PCM values are multiplied by single bits, and can therefore be easily performed by a simple multiplexor. Also using the .. approach, the decimation and interpolation stages required for converting from .. to PCM (and vice-versa) suitable for Nyquist DSP algorithms are circumvented. The paper will describe the sigma delta adaptive LMS filter architecture and present preliminary results for adaptive echo cancellation using adaptive sigma delta and standard PCM architectures