现代信息科技2025，Vol.9Issue(17)：12-17,6.DOI:10.19850/j.cnki.2096-4706.2025.17.003
基于差分PWM的低成本音频输出方案研究与设计
Research and Design of Low-cost Audio Output Scheme Based on Differential PWM
于海波 1崔幸2
作者信息
- 1. 浙江利尔达物联网技术有限公司,浙江 杭州 310000
- 2. 杭州电子科技大学信息工程学院,浙江 杭州 311305
- 折叠
摘要
Abstract
A low-cost audio output scheme based on differential PWM technology instead of traditional Codec chip is proposed.By analyzing the basic principle of sound and the application of PWM technology in analog signal generation,a differential audio output circuit based on second-order RC low-pass filtering is designed.Experiments show that the scheme can effectively filter out high-frequency carrier noise while ensuring the normal output of audio signals below 20 kHz,and has good anti-interference ability.The test results show that under the design parameters with a cut-off frequency of 2 kHz,the audio distortion of the system is less than 1%,and Signal-to-Noise Ratio is higher than 80 dB,which can effectively replace the traditional Codec scheme and reduce the system cost by about 30%.This design is suitable for consumer electronics products that are not demanding on sound quality but are cost-sensitive.关键词
差分PWM/音频输出/低成本/低通滤波/嵌入式系统Key words
differential PWM/audio output/low-cost/low-pass filtering/embedded system分类
信息技术与安全科学引用本文复制引用
于海波,崔幸..基于差分PWM的低成本音频输出方案研究与设计[J].现代信息科技,2025,9(17):12-17,6.
