Most 对象 振动 in a more 复杂 way than a simple back and forth 运动 The more 复杂 the 共鸣 the more 复杂 the resulting 声波 波

Simple 声波 can be 加 together When this happens more 复杂 and interesting soundwave 模式 appear

合并 Sounds
Any 声 can be 加 together and 特征 of the 起始 声 will often be transferred into the 终 复杂 声波

As explored in 生成 声 the three 一般 类别（流派） of 声波 are 噪 脉冲 Click and 音高 声

Pitched 声 are regular while 噪 声 are erratic and impulses are very short

These three 声波 种类 can be thought of as 极端 种类 of 生成 声波 Many other 声 存在 between these 极端 points as a 混合 of all three 声波 种类

混 between these three extremes will give us an unlimited supply of 混合 and 复杂 声

Extra
Different 种类 of simple 声波 and what makes them different are explored in 生成 声

If you’re completely lost then it might be useful to refresh your 内存（记忆） of 基础 声波

Fact
We can see the difference between noisy and pitched 声 by 创作 a 声谱 for each 种类 and 对比 them

图像 of a 噪 Sound
A 噪 sound

图像 of a Pitched Sound
A pitched sound

As 声 get more 复杂 so do their 可视化

合并 波 Types
As we combine pitched and 噪 声 we get 声 of 增 complexity

The 跟随 声波 was 创作 from a 混合 of 噪 and a 正弦 音

A 混合 Sound
This 声波 was 创作 by 合并 a pitched 正弦 音 with white 噪 The resulting 声波 retains the 音高 of the 原始/原创 正弦 音 but has been coloured with 噪 特征 from the white 噪

Can you 听 the difference and similarities between the 原始/原创 声 above and the 终 输出 sound?

Beyond 基础 声波 Types
对象 that 振动 in a more ordered fashion produce 声 that we 描述 as pitched This is because the 声 产生 包含 a greater focus of 声波 波 能量 with 频率 concentrated into 窄 频带 These concentrations of 声波 波 能量 are called 分音

Here you can see the many 分音 水平 lines which make up the guitar 声波

The guitar string itself is very 窄 and this 窄 size causes the vibrational 能量 to remain very focussed When the string vibrates it can only do so in a 数 of ways The 图像 below shows some of the 各种各样 rates of 共鸣 which 出现 as the string is plucked

Each of these different 波 of 共鸣 relate to 分音 that you can see in the 声谱 of the guitar 声波 above


The 合并 waveform

All of the 共鸣 出现 simultaneously as the strong is struck And 交互 with one another to 创作 a 复杂 波形 模式

The 关系 of 分音 within a pitched 声波 can also 影响 the 种类 of 声波 that we 听

Fact
If the 分音 制作 a 声波 are 相关 to one another by whole 数 比率 we can 描述 the 声波 as 谐/泛音

The guitar 声波 is an 例如 of a 谐/泛音 声波

You can see in the 声谱 above that all of the 分音 are evenly and regularly spaced

Where the 分音 are 不 evenly spaced we 描述 the 声波 as 非和谐
Bells make an 非和谐 声波

非和谐 声 are still pitched but they do 不 have a simple 关系 between 分音