Title:
ACTIVE NOISE CANCELING EARPHONE USING 3-LEVEL DIGITAL SIGNAL
Document Type and Number:
WIPO Patent Application WO/2018/186540
Kind Code:
A1
Abstract:
The present invention relates an active noise canceling earphone using a 3-level digital signal, the earphone reducing a loop delay time by using a 3-level pulse width modulation (PWM) signal or a 3-level pulse density modulation (PDM) signal, thereby enabling a frequency range capable of active noise canceling in the earphone receiving a digital audio signal to be increased. The active noise canceling earphone using the 3-level digital signal, according to the present invention, allows a loop delay time to be reduced in a digital active noise canceling earphone by using the 3-level PWM signal or the 3-level PDM signal, thereby enabling the attenuable maximum frequency of the noise sound signal to be increased to 500 Hz to 2,500 Hz.
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Inventors:
PARK HONG JUNE (KR)
JANG YOUNG JAE (KR)
CHO SEONG EUN (KR)
MOK IM SOO (KR)
JANG YOUNG JAE (KR)
CHO SEONG EUN (KR)
MOK IM SOO (KR)
Application Number:
PCT/KR2017/009119
Publication Date:
October 11, 2018
Filing Date:
August 22, 2017
Export Citation:
Assignee:
POSTECH ACAD IND FOUND (KR)
International Classes:
H04R3/00; G10K11/178
Foreign References:
| KR20090061134A | 2009-06-16 | |||
| JPH06161473A | 1994-06-07 | |||
| KR20160140161A | 2016-12-07 | |||
| KR20120073103A | 2012-07-04 | |||
| US20130308785A1 | 2013-11-21 |
Attorney, Agent or Firm:
LEE, Cheol Hee (KR)
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