Apparatuses and methods for testing a system having a transient response that is longer than the intervals between stimulations, using a sequence of stimuli containing a small jitter. The timing sequence (called a q-sequence) is constrained by time-domain and frequency-domain rules. The system-response can be recovered from noise, despite response superposition, using deconvolution with a recovery sequence. The acronym QSD means 'q-sequence deconvolution'. The invention is especially applicable to signal processing of evoked-responses, including those used for disease screening.
QSD recovery of superposed transient responses