均匀频谱脉冲序列的辨别

Discrimination of uniform spectrum pulse sequences.

作者信息

Pollack I

出版信息

J Acoust Soc Am. 1979 Jul;66(1):115-22. doi: 10.1121/1.383063.

Abstract

Random polarity-modulated sequences were produced with a uniform short-term spectrum over defined sampling intervals by a method described by Pierce, Lipes, and Cheetham [J. Acoust. Soc. Am. 61, 1609-1621 (1977)]. These are identified as PLC sequences. By contrast, unconstrained random polarity-modulated pulse trains with a constant interpulse interval may depart from a short-term uniform spectrum. It is shown that listeners can clearly discriminate between PLC sequences and unconstrained random sequences, and can discriminate among different PLC sequences. This discrimination is more nearly related to the statistical redundancy of the PLC sequences. This discrimination is more nearly related to the statistical redundancy of the PLC sequences than to their run-length distribution. Such discrimination is relatively resistant to moderate degrees of temporal jitter and is obtained with other forms of information coding. Discrimination of PLC sequences is presumably based upon phase information.

摘要

通过皮尔斯、利佩斯和切瑟姆[《美国声学学会杂志》61, 1609 - 1621 (1977)]所描述的方法，在规定的采样间隔内产生具有均匀短期频谱的随机极性调制序列。这些被识别为PLC序列。相比之下，具有恒定脉冲间隔的无约束随机极性调制脉冲序列可能会偏离短期均匀频谱。结果表明，听众能够清晰地区分PLC序列和无约束随机序列，并且能够区分不同的PLC序列。这种区分与PLC序列的统计冗余度更为相关，而不是与其游程长度分布相关。这种区分对中等程度的时间抖动相对具有抗性，并且在其他形式的信息编码中也能实现。对PLC序列的区分大概是基于相位信息。