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本文提出了一种新型的9.6kb/s时域谐波压扩(Time Domain Harmonic Scaling,简称TDHS)与自适应比特分配(Adaptive Bit Allocation,简称AB)子带编码(Subband Coding,简称SBC)系统(TDHS+SBC—AB),该系统采用了三子带等带宽子带编码。文中提出了一种根据各子带余量信号的最大幅度进行自适应比特分配的算法,并提出了一种新的比特调整方法,减少了运算量,简化了系统。本文还提出了以不同的帧长分别进行TDHS处理和SBC编码的新编码结构,有效地改善了重建语音的质量。并对系统的比特分配进行了优化。对典型汉语测试语句的计算机模拟结果表明,本文所设计的系统的重建语音主观质量优于已有的16kb/s SBC—AB系统,重建语音的自然度和清晰度都较高。
In this paper, we propose a new 9.6kb / s Time Domain Harmonic Scaling (TDHS) and Adaptive Bit Allocation (AB) Subband Coding (SBC) system (TDHS + SBC-AB), the system uses three subband bandwidth subband coding. In this paper, an adaptive bit allocation algorithm based on the maximum amplitude of each subband residual signal is proposed, and a new bit adjustment method is proposed to reduce the computational complexity and simplify the system. In this paper, we propose a new coding structure for TDHS processing and SBC coding with different frame lengths, which can effectively improve the quality of reconstructed speech. The system’s bit allocation is optimized. Computer simulation of typical Chinese test sentences shows that the subjective quality of the reconstructed voice system is better than the existing 16kb / s SBC-AB system, and the reconstructed voice has higher naturalness and clarity.