数字输出到解码器，用这款声卡应该不错RME HDSP 9632，今后的目标之一：
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Tech Specs
Supported sample frequencies: Internally 32, 44.1, 48, 64, 88.2, 96, 176.4, 192 kHz. Externally 28 kHz - 200 kHz
8 buffer sizes/latencies available: 1.5 ms, 3 ms, 6 ms, 12 ms, 23 ms, 46 ms, 93 ms, 186 ms
All settings changeable in real-time
Automatic and intelligent master/slave clock control
Enhanced Mixed mode: All inputs and outputs simultaneously operational
TMS (Track Marker Support): Supports CD/DAT start-IDs and the read out of CD subcode
Unique status windows for record and playback, showing mode and sample rate
DIGICheck, RMEs unique metering and analysing tool
Digital inputs and outputs ground-free transformer coupled
3-stage hardware level control for analog inputs and outputs
Servo-balanced analog input and output, DC-coupled signal path
192 kHz / 24-Bit converters. SNR 110 dB RMS unweighted, 113 dBA
Maximum input and output level (0 dBFS @ HiGain): +19 dBu
Low impedance headphone output (75 ohm), stepless output level through software faders
Headphone Speaker Protection minimizes noise during power on/off
All inputs and outputs simultaneously operational
Super low jitter design: < 1 ns in all clock modes
