复合频率 meaning in English

combination frequency
complex frequency

Compound frequency distribution
复合频率数分布
Tone color the color of the voice would send out with the different musical instrument with the characteristics , different person each have the special features s voice , and can say it to have relation with voice for vibrating , if say the tone is the symbol of the one frequency , so the tone color is then from the performance for compound frequency for constituting of of various frequencies
音色声音的色彩和特点，不同的人和不同的乐器都会发出各具特色的声音，可以说它与声源振动的频谱有关，如果说音调是单一频率的象征，那么音色则是由多种频率所组成的复合频率的表现。