Title:
AMPLIFIER CIRCUIT, AND PLAYING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2021/128993
Kind Code:
A1
Abstract:
Provided are an amplifier circuit, and a playing apparatus. The amplifier circuit comprises filters to an N-th order, a comparator, and a digital circuit. After an original audio signal has passed through the filters, a filtered signal is obtained. After the filtered signal has passed through the comparator and the digital circuit, a corresponding digital signal is output. The number of operational amplifiers used in the filters is less than N. N is a natural number greater than 1. In the amplifier circuit of the present invention, reducing the number of operational amplifiers used in the filters to the Nth order reduces the area occupied by the circuit, and further reduces power consumption, without compromising filtering performance.
Inventors:
SONG YIWEI (CN)
ZHOU TAO (CN)
ZHOU TAO (CN)
Application Number:
PCT/CN2020/116583
Publication Date:
July 01, 2021
Filing Date:
September 21, 2020
Export Citation:
Assignee:
RDA MICROELECTRONICS SHANGHAI CO LTD (CN)
International Classes:
H04R3/00
Foreign References:
| CN210518805U | 2020-05-12 | |||
| CN102832893A | 2012-12-19 | |||
| CN109995364A | 2019-07-09 | |||
| CN1713515A | 2005-12-28 | |||
| US20150054578A1 | 2015-02-26 |
Attorney, Agent or Firm:
LEADER PATENT & TRADEMARK FIRM (CN)
Download PDF: