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发表于 2013-12-12 11:30
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the variable apparently goes through an ADC/DAC stage to accomplish the volume control function. Gotta wonder why they went to all that trouble
The variable goes through a multiplying DAC, (that multiplies an analogue signal by a digital word) which is a pretty common way of achieving "digital" gain control. Way nicer and more reliable than motor-driven potentiometers!
After that it's buffered and given a current boost (so it can drive low-Z headphones).
It needed to be electronically controllable, because you can set the output level by IR remote, or by the serial data connection on the back. And the intention was that it could interface directly with active loudspeakers (Agora-B maybe if you were rich!), needing no extra preamp.
找到了国外网友的类似回复,大致的意思就是可变音量输出是通过或DAC用数字增益的方式来调节音量。
可以通过遥控器调节输出电平(不知前面板功能能否实现)。
主要的用途就是可以直接连接有源音箱,而不用使用前置放大器。 |
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