Patent ID: 8335320

Claim:
A headphone connected to an electronic device including an electronic circuit that adjusts a variation of an electric characteristic of the electronic circuit, the headphone comprising: an audio collection section; an audio output section; an adjustment section that adjusts a variation of an acoustic characteristic of the audio collection section and the audio output section, wherein the audio collection section collects a noise signal, the noise signal is inverted by the electronic circuit, and an inverted reduction signal is output from the audio output section to reduce noise, the audio collection section and the audio output section are a high-sensitivity microphone and a low-power speaker, respectively, or a low-sensitivity microphone and a high-power speaker, respectively, to make the headphone adjustable within an adjustable range of the adjustment section, the high-sensitivity microphone and the low-sensitivity microphone having a first and a second predetermined sensitivity range, respectively, and the high-power speaker and low-power speaker having a first and a second predetermined output range, respectively, and the first predetermined sensitivity range is greater than the second predetermined output range, and the first predetermined output range is greater than the second predetermined sensitivity range.