摘要
提出并设计了一种新型音频功率放大器。该系统通过高速采样,多采样率的插值运算,半带低通滤波以及∑-△调制,将音频PCM信号转换成二进制序列,经过高速开关管还原出具有原始功率谱的功率信号。该功率放大器具有D类数字功放高效率特点的同时,能够保证高保真的还原性,并且具有进一步提升信噪比的空间。
A new kind of digital audio power amplifier based on DSP is proposed. It samples the audio PCM signal in high speed, do interpolation of multi-speed and filter it by digital filter. The digital filters are half band filter and ∑-△modulation, all designed for high speed and high signal noise ratio. After filter the modulated signal is changed into binary sequence. Then use the binary sequence to drive Power MOS to produce power signal with original spectrum. This amplifier own the character of high efficiency and hifi quality, and the SNR could be easily promoted.
出处
《微计算机信息》
北大核心
2007年第29期138-139,309,共3页
Control & Automation
基金
国家自然科学基金资助(50447008)
