MySQL beta at CHEARSdotinfo co uk

Lesson 6

非线性 失真 Any 失真 results in new 频率 components being 生成 within the 设备 which do 不 rightfully belong to the 信号

If the 输入 信号 to an 扩器 is 增 we 期望 a corresponding 增 in 输出 The 操作 区域 over which this is true is rightly called the 线性 区域

Every 為耳/音频 系统 however has its upper 限制 Trying to get 100 瓦特 out of a 10- 瓦特 扩器 certainly results in penetration of what is called the 非线性 区域 Our first exercise 探索 the 失真 resulting from what is called 信号 削峰

The simplest way to 描述 the amount of 失真 is to 滤器 out the 基（础） and measure the 谐（泛音） remaining These 谐（泛音） are then 表示 as a 百分比 of the 基（础）

THD = 总 谐/泛音 失真

Ten percent 谐/泛音 失真 is considered to be very heavy 失真

It is well for us to 音符 at this point that 现代 professional power 放大器 and the better 高保真 consumer-type 放大器 are commonly rated as 低 as a few hundredths of 1 percent 总 谐/泛音 失真

A 改 形（曲）式 of 削峰 results from applying too 高 a 信号 to a 磁 錄機/录机

This results in what is often called a soft 种类 of 削峰 as the 磁带 becomes saturated magnetically
Another 形（曲）式 of 失真 has to do with the slight 变动 in the 速度 of the 磁带 in a 磁 錄機/录机 or the rotational 速度 of the turntable
as a 光盘/磁盘 錄/录 is being played Such 速度 changes result in 不自然 移位/偏移 in 频率

This illustrates what is commonly and understandably called wow

A 类似 形（曲）式 of 失真 resulting from 快 速度 波动 is called 抖动 It can be caused among other things by 脏/得体 錄/录 heads in 磁 录机