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:
May. 03, 2005
Filed:
Aug. 16, 2002
Yong Hun Cho, Kyungki-Do, KR;
Bong Joo Kim, Seoul, KR;
Yong Hun Cho, Kyungki-Do, KR;
Bong Joo Kim, Seoul, KR;
Pulsus Technologies, Seoul, KR;
Abstract
The present invention relates to an audio amplifier using a pulse width modulation, and more particularly, to a pulse width modulation type audio amplifier which an average switching frequency or a cutoff frequency of a low pass filter is variable in accordance with frequency of input signal. The present invention has a method for using average switching frequency of an output pulse by lowering the average switching frequency in accordance with the bandwidth of the input audio signal for relative narrow bandwidth than that of an input audio signal having a usual bandwidth of 20 kHz like as a pulse width modulation type radio signal and a low bandwidth signal for a subwoofer, a method for lowering a cutoff frequency of a low pass filter for restoring an output pulse to a continuous time signal together an average switching frequency of the output pulse, and a method for using respective average switching frequencies different to each other for each channel having respective different bandwidths in a multi-channel amplifier. By using the average switching frequency as lower as possible in accordance with the bandwidth of the input audio signal, the power efficiency is enhanced and the electromagnetic interference affecting peripheral devices can be minimized.