调频FM的英文解释

FM.调频 即frequency modulation

调频是指让高频振荡的频率随着音频信号大小而变化。

调频无线技术的原理和收音机工作原理比较接近，使用的是FM（调频）方式。不过收音机的调频使用的是模拟信号，相对而言失真比较明显，采用调频无线技术的音响多数使用数字方式。简单的说是将模拟音频信号通过AD转换器转换为数字信号，再将信号对载波进行调制并发射，接收端则使用同样频率接收，通过DA转换器转换为模拟信号，然后放大输出到扬声器。载波是无线发射器的中心频率，FM调制就是指用声音信号对载波波形的频率参数进行控制，使载波信号带有声音信息。

调频无线技术比较成熟，实现的成本比较低。其缺点是无线电波容易受到干扰，当周围有频率比较接近的无线电波时会产生明显的失真。为避免这种情况，音响的无线调频载波频率非常高，远远高于无线广播的载波频率，有些产品还可以手工设定数个不同载波频率，以避免同类设备之间的干扰。

翻译之后：

FM frequency modulation

FM refers to let high-frequency oscillation frequency with the changes in the size of the audio signal.

FM wireless technology and the principles of operating principle is closer to the radio, using FM (frequency modulation) mode. However, the FM radios used by the analog signal is relatively more obvious distortion using FM radio technology, the majority of the use of digital audio. Simply put, is the analog audio signal through the AD converter into a digital signal, and then to the carrier signal modulation and launched the receiving end is using the same frequency to receive, through the DA converter for converting analog signals, and then zoom to the speaker output. Carrier is a wireless transmitter at the center frequency, FM modulation refers to the use of the voice signal to the carrier wave frequency control parameters so that the carrier signal with a voice message.

FM wireless technology more mature and realize the cost is relatively low. The shortcoming of radio waves is vulnerable to interference, when surrounded by close to the frequency of the radio wave will have a significant distortion. To avoid this situation, the wireless FM audio carrier frequency is very high, much higher than the carrier frequency of the radio, some products can also be manually set up several different carrier frequency to avoid interference between similar devices.