Patent ID: 8335944

Claim:
An automatic testing apparatus, comprising: a device under test, having a testing program, and including a plurality of functional modules; and a testing module, coupled to said device under test, and testing said plurality of functional modules of said device under test; wherein said device under test executes said testing program and communicates with said testing module, which tests said plurality of functional modules of said device under test, said testing module includes: a control unit, receiving a testing signal produced by said device under test while said device under test executing said testing program, and producing a control signal; and an audio testing circuit, receiving said control signal and producing a sound signal, a play unit of said plurality of functional modules playing said sound signal, and said audio testing circuit testing said sound signal played by said play unit, said audio testing circuit includes a compare module, comparing a threshold value and said sound signal played by said play unit for performing audio testing, said compare module includes: a first extraction circuit, extracting an alternating-current signal of said sound signal; a first compare circuit, receiving said alternating-current signal, comparing said alternating-current signal and an alternating-current threshold value of said threshold value, and producing a first compare signal; a second extraction circuit, extracting a direct-current signal of said sound signal; and a second compare circuit, receiving said direct-current signal, comparing said direct-current signal and a direct-current threshold value of said threshold value, and producing a second compare signal; wherein said compare module produces an output signal according to said first compare signal and said second compare signal for judging if said play unit operates normally.