METHOD AND DEVICE FOR INSPECTING INTERPHONE

摘要

PROBLEM TO BE SOLVED: To reduce inspection cost and to shorten inspecting time when inspecting an interphone for speech quality and call tone quality. SOLUTION: The interphone to be inspected is constituted in such a way that talking voices and a call tone commonly use at least a part of the circuits. At the time inspecting the interphone, speech quality is first inspected by giving an already known signal to the interphone and measuring the response of the outputted sound (S1). Then the quality of the call tone is inspected by correlating the signal with at least a part of the data obtained at the time of inspecting the speech quality (S2).