Abstract: An earphone and a method for noise reduction in the earphone are disclosed in the present invention. The earphone includes: an audio circuit configured for outputting an audio signal; a noise cancellation circuit configured for detecting an ambient noise signal, determining phase of the ambient noise signal and reversing such phase to generate an anti-noise signal having same level and opposite phase as that of the ambient noise signal; a combiner unit configured for combining the audio signal with the anti-noise signal to generate a combined signal; a speaker electrically connected to the combiner unit and configured for receiving and outputting the combined signal; wherein, the combiner unit includes a first diode and a second diode electrically connected to the speaker in parallel; the audio circuit is electrically connected to the first diode; and, the noise cancellation circuit is electrically connected to the second diode.

Abstract: The present invention relates to a low-power-consumption active noise-reduction in-ear music headphone and a method for noise reduction. The headphone comprises an audio plug, in-ear earplugs and a noise-reduction control board, wherein the noise-reduction control board comprises a low-power-consumption active noise reduction circuit, which comprises a noise processing channel, an audio signal channel, and a sound mixing circuit connected with output ends of the two channels; and the sound mixing circuit is a by-pass switch consisting of two mutually independent low voltage drop diodes. The method comprises: processing ambient noise signal to generate a reverse noise signal, mixing the reverse noise signal with an audio signal, and outputting the mixed sound to a loudspeaker to generate a sound wave containing reverse noise in an auricular cavity, in which the reverse noise and the ambient noise transmitted into the auricular cavity from an environment counteract with each other to reduce noise.