Quantitative analysis yields objective audio-amplifier click and pop measurements

摘要

Product differentiation in portable audio devices is a hot topic. But what makes one product better and more desirable than its similarly specified rival? From a performance viewpoint, the usual audio figures of merit, such as frequency-response flatness, THD+N (total harmonic distortion plus noise), and clipping levels maybe too similar to point to a winner. The user interface is an obvious differentiator, but more subjective audio-performance parameters can set one product above another. One such factor is the occurrence of "clicks" and "pops" or other strange, transient noises audible through the headphones or speakers when a user turns the unit on or off. Although these types of events are difficult to assess, a method that quantifies this click and pop parameter allows meaningful, repeatable comparisons between components.