Transfer function technique for impedance and absorption measurements in an impedance tube using a single microphone

Using a periodic pseudorandom sequence as the noise source, it is possible to implement the two-microphone transfer function technique for impedance and absorption measurement in an impedance tube with a single microphone, thereby eliminating the elaborate calibrating procedure and any error associated with phase-mismatching. Results obtained by the proposed procedure compared well with those obtained by the standard standing-wave-ratio method.