Ideal audio reproduction tolerates delay and gain because systems are causal

Evidence

Our observation of a distinct delay to the appearance of compression (or gain) in the response envelopes is new, however. We currently believe that it is impossible to produce such a delay without resorting to a non-instantaneous form of gain control, such as an AGC. Other (non-AGC) types of system which produce level-dependent group delays can easily mimic the envelope asymmetry (hysteresis) effects that we observe, but (to the best of our knowledge) they cannot produce an actual delay in the “effect” of the nonlinearity. — Dijk, Pim van, Physiology, Psychoacoustics and…, 3659 (#expands, via linked claim)

Categorization

• XREF: connects to: Audio coding aims to reconstruct signals while other processing modifies them; Cochlear compression delay implies automatic gain control circuitry — Dijk, Pim van, Physiology, Psychoacoustics and…, 3659

Broader Connections

• Audio coding aims to reconstruct signals while other processing modifies them #expands (0.72)
• Cochlear compression delay implies automatic gain control circuitry #expands (0.70) — Dijk, Pim van, Physiology, Psychoacoustics and…, 3659