用于子带编码的滤波器设计的一种新方案

A New Method for Design of SBC Filter

本文对子带编码的SBC分带滤波器设计提出了一种新的方案,用全通IIR滤波器组成一种新的SBC滤波器结构。它只要5个系数(11阶)就可达到阻带衰耗 61dB,通带波动0.001dB,过渡带为1.9kHz～2.1kHz的指标,其特性优于32阶的FIR滤波器,并且在不考虑量化误差的情况下,恢复信号的幅频特性可达到无失真,同时它的时延极小,有可能成为替代FIR分带滤波器的强有力的候选者。

In this paper, we present a new method for the design of SBC filter. The new structure of SBC filter is composed of all-pass IIR filter. Its performance is much better than that of FIR filter. When no quantization is considered, the amplitude- frequency response of synthetic speech is the complete representa- tion of the original signal by using this filter,and the filtering delay is very small. So it may be the powerful candidate of SBC filter.