信号的低比特位数表示:一种新颖低比特位数的Σ-Δ调制器

Denoting a Signal With Low Bits:the New Sigma-Delta Modulator With Lower Bits

通过设计一种新的噪声整形滤波器 ,本文提出了一种新颖的Σ -Δ调制器结构 ,可用于实现用较低比特位数的数字信号表示较高比特位数的输入信号 .该调制器与传统的Σ -Δ调制器相比 ,其输出数字信号比特位数(或动态范围 )降低了许多 .理论推导分析和仿真对比的结果表明 ,在量化噪声整形和噪声频谱上 ,该调制器的各项性能有了很大的提高 。

A new sigma-delta modulator is proposed by designing a new noise-shaping filter. By use of this modulator, the input signal can be represented as a signal with lower bits. The number of the output bits of this kind of modulator is greatly decreased, in contrast to the traditional sigma-delta modulator. Theoretical analysis and simulations for this modulator show that it has a great improvement in quantizing noise shaping and noise frequency spectrum. The stability of this kind of modulator is also proved.