Response of Spectrum Analyzers of the Bank‐of‐Filters Type to Signals Generated by Vowel Sounds

This paper describes a study that has been made of a comparison of the response of spectrum analyzers of the bank‐of‐filters type to signals generated by steady‐state vowel sounds. Each analyzer is comprised of a bank of one of the following types of filters: single‐tuned, cascaded single‐tuned, double‐tuned, cascaded double‐tuned, Butterworth, and Gaussian. Both constant‐bandwidth and constant‐mel‐bandwidth analyzers were investigated. The response characteristics of these analyzers were obtained both with and without frequency equalization. A comparison was made of constant‐bandwidth analyzers having bandwidths of 70, 140, and 280 cps. In this investigation, the bank of filters and the input signals to the analyzers were synthesized on a digital computer.