...World Intellectual Property Organization) As anyone who watches Dr. Phil has surely learned, standard polygraph testsmeasure responses such as blood pressure, pulse, and respiration rate to detect anxiety associated with guilt or lying...
http://news.cnet.com/8301-17938_105-10049177-1.html
...do not have the ability to measure acoustic echo. They only operate in a one-way listening mode. The objective testsmeasure one-way speech distortion and noise quality. They do not measure echo, delay, loudness loss and other impairments...
http://www.ivp.tellabs.com/resources/papers/tlab_pbvqe_wp.pdf