| Summary: | The development of acoustic filter theory followed closely the development of electric filter theory. Electric wave filters owe their origin to the observation of G. A. Campbell that in a "loaded" telephone line, the lower frequencies are transmitted with less attenuation and the higher frequencies with more attenuation than in the case of a line with no loading. Soon after, G. W. Stewart at Brown University, investigated analogous effects in acoustic tubes and developed a simple theory of acoustic filters. Exploiting the analogy between electric and acoustic phenomena, he considered acoustic tubes as lumped impedance elements.
|
|---|
