Stable Single-Bit Noise-Shaping Quantizer Based on Σ△ Modulation and Successive Data Coding into Pre-Optimized Binary Vectors(Special Section on Digital Signal Processing)
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概要
- 論文の詳細を見る
This paper presents data coding techniques for a stable single-bit noise-shaping quantizer, which has a cascade structure of a multi-bit Σ△ modulator and a binary interpolator. The binary interpolator chooses a pre-optimized binary vector for each input sample and successively generates the chosen binary vector as an output bit stream. The binary vectors can have different lengths. The paper also proposes two methods to evaluate and bound output errors of a binary interpolator. A multi-bit Σ△ modulator is designed to cause no overload for all possible input signals whose amplitudes are bounded to a specified level, and thus the Σ△ modulator rigorously guarantees the stability condition. In design examples, we have evaluated Signal-to-Noise and Distortion Ratios (SNDRs) and noise spectra and then confirmed that our stable quantizers can sharply shape output noise spectra.
- 社団法人電子情報通信学会の論文
- 2002-08-01
著者
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Nishihara Akinori
Center For Research And Development Of Educational Technology Tokyo Institute Of Technology
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Yagyu Mitsuhiko
Department Of Electrical And Electronic Engineering Tokyo University Of Agriculture And Technology
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