The optical signal was amplified by a lock-in amplifier.

光信号用锁定放大器放大，进行动态测量。

youdao

We use the principle of lock - in amplifier to amplify the weak singal and send it to A/ D conversion properly.

为将接收二极管上的微弱信号送到A／D转换器处理，采用锁定放大原理设计接收信号的调理电路。

youdao

The mix-lookin detection technique for high frequency signal measurement with low frequency look-in amplifier is presented.

本文提出一种利用低频锁相放大器测量高频信号的混频-锁相检测技术。

youdao

"Last year,one of our staff members actually brought his own guitar and amplifier and led us in several rounds of song, Christmas songs and holiday songs.

VOA: special.2010.12.20

The new luxury AH-NC600 earbud headphones offer music lovers an opportunity to enjoy the ultimate in private listening enjoyment, with a high-quality built-in amplifier and advanced noise-cancelling technologies that reduce outside ambient noise by 99%.

ENGADGET: Denon outs 2009 line of Blu-ray players, AV receivers and headphones

The software would then add up the impedances just like an electrical engineer adding up impedances in an amplifier circuit.

FORBES: Magazine Article

"In 1962 Jim Marshall developed the first Marshall amplifier in his shop in Hanwell, London, England after taking time to listen to what guitar players wanted and needed, " says Managing Director of Marshall Amplification, Jonathan Ellery.

ENGADGET: Marshall's Hanwell HiFi speaker is bred from guitar amps, at-home with your PMP (update)