Group delay describes the time-domain behavior of a transfer function
Evidence
A technical measure commonly used to describe the temporal-domain characteristics of a signal or a transfer function is the group delay τg(ω), defined in Equations (3.23a) and (3.23ab) on page 51. It is related to the delay of the components of the envelope (or modulation) of a signal. For example, the phase characteristics of a loudspeaker can be described by group delay. The mean value of the delay has no importance in one-way communication, such as listening to music records. However, if two-way communication is utilized, the group delay should be minimized to avoid latencies. If the group delay changes significantly with frequency, audible degradations of quality may occur. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1274
Categorization
Category: Definitional Content
- DEFINE: Defines group delay and explains why mean delay is harmless for one-way playback but harmful for two-way communication.
- XREF: Relates to Chapter 1 communication-acoustics framing of two-way vs one-way links; also to the reader’s interest in applied acoustic communication.