频域分辨率和时域包络周期性对音乐音高分辨的影响

Effects of spectral resolution and temporal envelope periodicity on musical pitch discrimination

系统地分析与探讨频域分辨率及时域包络周期性对不同音色及频率覆盖范围的音乐音高分辨的影响。选择钢琴、小提琴、小号及单簧管四种乐器的乐音和特定的复合音作为测试音源。利用噪声调制的声码器模型调控音乐信号的频域分辨率和时域包络周期性。十位正常听力者参与了该项音高分辨测试。实验结果表明,随着频域分辨率的提高,受试者对音高分辨的准确率呈上升趋势,16个频带已可获得较好的音高分辨效果;当时域包络周期性信息增加时,未见其对音高分辨产生一致性积极影响。

The main goal of this study was to systematically investigate the relative contributions of spectral resolution and temporal envelope periodicity to musical pitch discrimination.Stimuli from four instruments（clarinet,trumpet, piano and violin） and synthetic complex tones were utilized.A noise-excited vocoder was used to control the spectral resolution and temporal periodicity of the musical stimuli.Ten normal-hearing subjects were recruited for the study. Psychoacoustic experiments on pitch discrimination were carried out.Results showed that the spectral cue is important for musical pitch discrimination.Relative good performance can be achieved when there were 16 frequency channels. No clear trend was found for the temporal periodicity to pitch discrimination.