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:
Oct. 21, 2025
Filed:
Jun. 25, 2022
Applicant:
Rda Microelectronics (Shanghai) Co., Ltd., Shanghai, CN;
Inventors:
Yiwei Song, Shanghai, CN;
Tao Zhou, Shanghai, CN;
Assignee:
RDA MICROELECTRONICS (SHANGHAI) CO., LTD., Shanghai, CN;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F 3/213 (2006.01); H03F 3/181 (2006.01); H03F 3/45 (2006.01); H03H 11/12 (2006.01); H03H 19/00 (2006.01);
U.S. Cl.
CPC ...
H03F 3/213 (2013.01); H03F 3/181 (2013.01); H03F 3/45475 (2013.01); H03H 11/1217 (2013.01); H03H 11/126 (2013.01); H03H 11/1291 (2013.01); H03H 19/004 (2013.01); H03F 2200/03 (2013.01);
Abstract
The present disclosure provides an audio amplifying circuit and a playing device, including: N-order filters and an integrated circuit; after an original audio signal passes through the N-order filters, a filtered signal is obtained; after the filtered signal passes through the integrated circuit, a corresponding digital signal is output; where the number of operational amplifiers adopted in the N-order filters is smaller than N, and N is a natural number greater than 1.