1.数字输出(digital out)，传送的是数字音频信号，是用于转盘至解码器之间的外部传输，传输方式一般有同轴(RCA或BNC接口)，光纤(方口或3.5mm的圆口)，高端领域还有AT&T(ST玻璃光纤)。另有平衡数字输出(AES/EBU)，与同轴类似，但采用适合长距离的平衡方式传输，接口为XLR三芯卡农头。要注意的是USB或者火线并非数字输出，传送的也不是数字音频信号。
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2.模拟输出(analog out)，传送的是模拟音频信号，是用于解码器至放大器之间的外部传输，接口一般为RCA(每声道各一条)或者3.5mm(用于便携式设备的简化接口，共地线)。另有平衡模拟输出，采用平衡方式传输，接口为XLR三芯卡农头(每声道各一条)。
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3.一个完整的数字音频播放器音源(任何可以播放数字音频文件并且具有模拟输出的设备，比如CD台机，声卡，甚至ipod)，必然内置有一个解码器(digital/analog converter)。而任何具有数字输出的音源，必然内置有一个转盘(transport)。这里的转盘有两部分组成，对于CD台机，转盘因为需要读盘，所以必须包含一个稳定的读盘机械结构，再加上一个数字音频信号的发射电路，两者对于数字输出品质都有影响。而声卡之类的音源不需要读盘的机械结构，因此只有一个数字音频信号的发射电路影响输出品质(抓取数字音频文件的那台电脑，包含光驱，供电，系统，软件设置等作为一个整体，充当了读盘机械结构)。
1C31132G01
1. Digital output, which transmits digital audio signals, is used for external transmission between the turntable and the decoder. The transmission methods generally include coaxial (RCA or BNC interface), optical fiber (square or 3.5mm circular port), and AT&T (ST glass fiber) in the high-end field. There is also a balanced digital output (AES/EBU), similar to coaxial, but using a balanced transmission method suitable for long-distance transmission, with an XLR three core Canon head interface. It should be noted that USB or Firewire are not digital outputs, nor are they transmitting digital audio signals.
2. Analog output, which transmits analog audio signals and is used for external transmission between the decoder and amplifier. The interface is generally RCA (one per channel) or 3.5mm (simplified interface for portable devices, common ground wire). There is also a balanced analog output, transmitted in a balanced manner, with an XLR three core Canon head interface (one for each channel).
3. A complete digital audio player audio source (any device that can play digital audio files and has analog output, such as a CD player, sound card, or even an iPod) must have a built-in decoder (digital/analog converter). Any audio source with digital output must have a built-in transport. The turntable here consists of two parts. For a CD player, the turntable must include a stable mechanical structure for reading the disc, and a digital audio signal transmission circuit, both of which have an impact on the digital output quality. And sound sources such as sound cards do not require a mechanical structure for reading disks, so only one digital audio signal transmission circuit affects the output quality (the computer that grabs digital audio files, including the optical drive, power supply, system, software settings, etc. as a whole, acts as the mechanical structure for reading disks).
1C31132G01
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