I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "During encoding, 576 time-domain samples are taken and are transformed to 576 frequency-domain samples.[clarification needed] If there is a transient, 192 samples are taken instead of 576. This is done to limit the temporal spread of quantization noise accompanying the transient. (See psychoacoustics.)"? 

When are the samples transformed?