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Цитата: Lock-in amplification is a technique used to separate a small,
narrow-band signal from interfering noise. The lock-in amplifier
acts as a detector and narrow-band filter combined. Very small
signals can be detected in the presence of large amounts of
uncorrelated noise when the frequency and phase of the desired
signal are known.
The lock-in amplifier is basically a synchronous demodulator
followed by a low-pass filter.--> Вот его мне и надо реализовать, только с ДСП. Аналоговую технику я здесь не копирую, метод такой просто.
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