Patent ID: 9516416
Filing Date: 2016-12-06
CPC Classification: G10K,H04R,H04S

Claim Text:
1. A multi-loudspeaker active noise cancelling headphone providing stereo effect and improved the performance of ambient noise reduction, connected to an audio signal for receiving and broadcasting thereof, comprising: a microphone; a first filter and a second filter that are electrically connected to the microphone; a first adder and a second adder that are electrically and respectively connected to the first filter and the second filter; an audio compensator to receive the audio signal and an active noise cancelling processor that are electrically connected to the first adder; an amplifier electrically connected to the active noise cancelling processor; a first loudspeaker electrically connected to the amplifier; a third filter electrically connected to the second adder; and a second loudspeaker electrically connected to the third filter; wherein the audio signal outputs music to the second adder that is processed and transformed by the third filter to match characteristics of the second loudspeaker and take into account of music quality to broadcast a first channel sound through the second loudspeaker; wherein the microphone receives an ambient noise from a space and outputs an ambient noise signal to the first filter to be processed and transformed to match characteristics of the first loudspeaker and take into account of noise reduction and broadcast music quality requirements and joins a music compensation signal from the audio compensator to be output to the active noise cancelling processor for phase processing to form a required noise reduction signal output to the amplifier which amplifies the signal to become a second channel sound broadcast through the first loudspeaker; wherein the second channel sound is received by the microphone and output to the second filter, and input to the third filter through the second adder to be processed and broadcast by the second loudspeaker to become a third channel sound which has a phase reversed to that of the audio signal and the ambient noise signal to improve the performance of noise reduction efficacy and become an auxiliary noise reduction signal.