PORTABLE HEARING TEST APPARATUS
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United States of America Patent
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Issued Date -
Feb 16, 2017
app pub date -
Aug 11, 2015
filing date -
Aug 11, 2015
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Abstract
A portable hearing test apparatus is arranged in an earphone and includes a microphone, an automatic noise elimination module, a mixer and an output unit. The microphone receives an external noise signal. The automatic noise elimination module converts the external noise signal into an inverse acoustic signal and sends the inverse acoustic signal to the mixer to mix with an audio signal provided by an electronic apparatus to obtain a mixed signal. Amplitude of the inverse acoustic signal is equal to amplitude of the external noise signal. Phase of the inverse acoustic signal and phase of the external noise signal are reverse. The mixer sends the mixed signal to the output unit to send out to cancel out the external noise signal, so that only the audio signal provided by the electronic apparatus is heard. A hearing test is proceeded with the audio signal.
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