Frequency Response Measurement Module
Uses a PC’s 2 channel sound card to measure the frequency response of a system. Can be used for a variety of applications such as a speaker, microphone, or the complex transfer function between two signal points such as the input and output of a telephone system. Computes telephonic metrics such as RLR (receive loudness rating), SLR (send loudness rating), and TCLw (echo reduction). Stepped sine, chirp and arbitrary WAV file excitation (such as real speech) are supported.