The images of the 1kHz signal are nominally higher, but as already said, their overall level is anyway low. In the range between 5-10kHz, the situation is very similar to that in the previous case. The first image of the 20kHz is partially suppressed. It is far from the desired goal, though. The higher images of the 20kHz and the other high frequencies are far better suppressed. A 20kHz sinewave looks better in the time domain.
