【摘要】 本文为语言通信系统提供汉语自然说话的声压级和在噪声环境中说话的声压级。经大量统计,得到了统计平均值和分布范围。此外还讨论了人头及身躯散射的影响,指出以人工嘴代替真人作声源时须加指向性校正。对几种常用监测仪表在语言声压级测量中的准确性也作了对比研究。更多还原

【Abstract】 This paper offers some data concerning cenversational speech levels of Chinese such as (1) long term mean RMS values, (2) RMS values of four pitch tones of Chinese words, (3) peak values, and (4) RMS value in environment of different noise levels.Since conversational speech varies fast with time, and its level fluctuates within a wide range, the dynamic response of the monitor systems (VU meter, Sound Level Meter, as well as Level Recorder) have been tested in order to find a more suitable system for statistical measurement. The results suggest that the Level Recorder is preferable for this purpose.Based on measuring more than five thousand syllables, the statistical distribution of long term speech level have been determined. Moreover, the speech powers were calculated from the so called "Talker’s level" formula of Fletcher rather than from spherical wave, because of the scattering effect of head and torse must be taken into accournt.更多还原