Reference Signal for Signal Quality Studies
Reference Signal for Signal Quality Studies
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用于信号质量研究的参考信号
DOI：
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发表时间：
1968
期刊：
影响因子：
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通讯作者：
M. Schroeder
中科院分区：
文献类型：
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作者：
M. Schroeder
描述了用于信号质量研究的参考信号族，其在感知上类似于经历某些信号相关失真（诸如量化和预测编码）的语音信号。这种感知相似性可以在主观比较测试中产生比使用加性、信号独立噪声的参考信号更高的准确性和再现性。同样重要的是，对于非平稳和间歇信号（如语音），本文所述的参考信号的信噪比（S/N）是在瞬时（逐个样本）的基础上定义的，从而避免了测量信号和噪声功率时的麻烦模糊性。其质量将被评估的失真信号可以被分配一个等效的S/N比，该S/N比与平均值被扩展的时间间隔无关。
A family of reference signals for signal quality studies is described that is perceptually similar to speech signals undergoing certain signal‐dependent distortions, such as quantizing and predictive coding. This perceptual similarity can yield greater accuracy and reproducibility in subjective comparison tests than do reference signals employing additive, signal‐independent noises. Equally important, for nonstationary and the intermittent signals (such as speech) the signal‐to‐noise (S/N) ratios of the reference signals described here are defined on an instantaneous (sample‐by‐sample) basis, thus avoiding the troublesome ambiguities in measuring signal and noise powers. The distorted signal whose quality is to be evaluated can be assigned an equivalent S/N ratio independent of the time intervals over which average are extended.