Testing apparatus and testing method for telephone apparatus

A testing apparatus, for testing a telephone apparatus, the testing apparatus comprising:

• an audio generator, generating a testing audio signal and transmitting the testing audio signal to a receiver of the telephone apparatus;
• an audio signal processor, coupled to the audio generator and the telephone apparatus, receiving the testing audio signal, receiving an output audio signal from a speaker of the telephone apparatus, and performing a time-to-frequency transformation operation on a difference between the testing audio signal and the output audio signal to obtain a noise information, wherein the noise information comprises a plurality of frequencies and a plurality of noise components respectively corresponding to the frequencies;
• and
• a noise analyzer, coupled to the audio signal processor, receiving the noise information, obtaining a maximum noise component among the noise components respectively corresponding to the frequencies in the noise information, and comparing the maximum noise component with a predetermined threshold to generate a testing result of the telephone apparatus.