A filter’s inherent time response is determined by its bandwidth

Evidence

A similar argument can used for band-pass filters. In this case there is a maximum range of frequencies that can be passed around a given frequency. Although the sine waves corresponding to the band-pass frequencies will be passed, and they may be at quite a high frequency, their amplitude envelope cannot vary quickly, as shown in Figure 1.59. This is because the speed of variation of the envelope depends on the number of, and total frequency occupied by, the sine wave components in the output of the filter, as shown in Figure 1.60. As it is the amplitude variation of the output of a bandpass filter that carries the information, it too has an inherent time response which is a function of its bandwidth. — David Howard, Jamie Angus, coustics and Psychoacoustics, 477

Categorization

Category: Causal Relationships

  • DEFINE: Clarifies the concept that filters impose a time response on signals due to bandwidth limitations.

Broader Connections