The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 25, 2015
Filed:
Dec. 04, 2009
Kah Chun Chin, Penang, MY;
Choon Huat Khoh, Penang, MY;
Siew Pheng Chong, Penang, MY;
Jin Ngee Ong, Penang, MY;
Kah Chun Chin, Penang, MY;
Choon Huat Khoh, Penang, MY;
Siew Pheng Chong, Penang, MY;
Jin Ngee Ong, Penang, MY;
Sony EMCS (Malaysia) Sdn. Bhd., Kuala Lumpur, MY;
Abstract
A noise cancelling headphone is described. The noise cancelling headphone utilizes a low power consuming noise cancellation circuit wherein an audio input signal is directly fed into the headphone without the use of an additional headphone amplifier. The noise cancelling circuit uses a microphone to pick up ambient noise and produces a signal which is equal in amplitude but opposite in polarity to the ambient noise signal. The resultant signal is mixed with the audio input signal and fed into the speakers of the headphone. This method is advantageous because it uses fewer components than conventional noise cancellation circuits and it also consumes less power due to the use of fewer components. The distortion of the audio input signal is also reduced since no amplification is performed to the audio input signal onboard the noise cancellation circuit.