Perfect sound reproduction tolerates arbitrary signal delay when reproducing recordings.
Evidence
Perfect reproduction of sound can be defined in terms of the transmission channel, by requiring that it is an LTI (linear and time-invariant) system where any input waveform is repeated perfectly at the output. For this ideal case, the transfer function H(jΟ) = 1 (see Section 3.2.1). In practical audio we may relax this definition of perfect sound reproduction. β¦ Since all physical systems are causal, the output is at least slightly delayed due to the finite speed of acoustic or electronic propagation of the signals. The permissible delay caused by a device may, in some sound reinforcement situations, be critical, and cannot exceed, say, 10 ms. However, when reproducing sound signals, for example when playing music from a recording, the delay can be seconds without major problems. Such a delay allows for the relaxation of the definition of perfect sound reproduction. β Ville Pulkki, Matti Karjalainen, Communication Acoustics- Anβ¦, 495
Categorization
- DEFINE: Defines the practical relaxation of perfect-reproduction: delay is acceptable except in live reinforcement contexts.
- XREF: The 10 ms live-reinforcement threshold connects to the earlier soundscape discussion of timing and acoustic feedback.