Patent ID: 8447041

Claim:
An audio output apparatus, comprising: an electricity-to-sound converter arranged in a housing and configured to reproduce a sound according to a first audio signal; a sound collector configured to pick up a sound outside said housing and output a second audio signal; a first frequency band limit filter that filters the second audio signal; a sound leakage evaluating block configured to evaluate a leakage of a sound reproduced by said electricity-to-sound converter into the outside of said housing on the basis of said first audio signal and said filtered second audio signal; a multiplier configured to multiply said first audio signal by a coefficient approximating a transmission characteristic between said electricity-to-sound converter and said sound collector when the sound reproduced and outputted by said electricity-to-sound converter leaks outside said housing to be picked up by said sound collector; a second frequency band limit filter that filters the multiplied first audio signal and supplies the filtered first audio signal to the sound leakage evaluating block, the first frequency band limit filter and the second frequency band limit filter having passing bands of 1 kHz to 3 kHz; and a controller configured to execute a predetermined processing on the basis of a result of an evaluation made by said sound leakage evaluating block.