In the text, Sections 6.8.1 to 6.8.5 (Signal-to-Noise Ratio, Optimizing the Signal-to-Noise Ratio, The Lock-In Amplifier and Gated Integrator or Boxcar, Signal Averaging, Waveform Recovery) all provide additional and complementary information to the discussion here. If you are interested in counting experiments (radiation or low-level photon counting) you may also want to look at Section 6.8.6 ...
