对象 that 振动 in a 随机 fashion produce 声音 that we 描述 as noisy This is because the 声音 产生 包含 a 随机性 assortment of 频率

Advanced

A 术语 that 描述 声音 that have a diffuse spread of 频谱 能量 It is often contrasted with pitched 声音 Noisy 声音 may be hard to 定义 in 术语 of 音高 because their 频谱 能量 涵盖 a wide 范围（排列） of 频率 and is 不 concentrated but diffuse

White Noise
This 声音 文件 plays white 噪音 careful it might be very loud!

This 图像（描绘） shows the complete spread of 声音 能量 across the 频谱