頭條 基于FPGA的音頻Sigma-Delta調(diào)制器設(shè)計(jì)與實(shí)現(xiàn) 隨著數(shù)字音源的普及,數(shù)模轉(zhuǎn)換器(Digital to Analog Converter, DAC)成為音頻設(shè)備中不可或缺的元件,其精度往往決定著整個(gè)系統(tǒng)的信號保真度。基于此,利用噪聲整形技術(shù)對用于高精度音頻DAC的Sigma-Delta調(diào)制器進(jìn)行設(shè)計(jì)和現(xiàn)場可編程門陣列(Field Programmable Gate Array, FPGA)實(shí)現(xiàn)。 通過搭建測試系統(tǒng),測試結(jié)果表明,所設(shè)計(jì)的Sigma-Delta調(diào)制器在輸入信號為1 411.2 kHz采樣頻率、1 kHz頻率、0 dBFS(Full Scale)幅度的正弦信號條件下,其輸出信噪比(Signal to Noise Ratio, SNR)可達(dá)107.4 dB;當(dāng)輸入信號頻率在音頻頻帶內(nèi)時(shí)(輸入信號幅度為0 dBFS),其輸出SNR穩(wěn)定保持在104 dB以上;并可用于WAV音樂播放器中。 最新視頻 畢明朝:無基底電極駐極體旋轉(zhuǎn)發(fā)電機(jī) 畢明朝:無基底電極駐極體旋轉(zhuǎn)發(fā)電機(jī) 發(fā)表于:8/9/2016 柳洋:熱式掃描探針納米加工技術(shù) 柳洋:熱式掃描探針納米加工技術(shù) 發(fā)表于:8/9/2016 王忠旭:Design of a Plasmonic Lense Based on Varied Line-space Nano-scale Metallic Gratings for Bionic Polarization Navigation Sensor 王忠旭:Design of a Plasmonic Lense Based on Varied Line-space Nano-scale Metallic Gratings for Bionic Polarization Navigation Sensor 發(fā)表于:8/9/2016 張愷:電紡直寫射流行為與噴射模式識別控制 張愷:電紡直寫射流行為與噴射模式識別控制 發(fā)表于:8/9/2016 Mohmmad Hamidnia:Experimental Investigation on the Thermal Performance of Si Micro Heat Pipe with Different Cross-sections Mohmmad Hamidnia:Experimental Investigation on the Thermal Performance of Si Micro Heat Pipe with Different Cross-sections 發(fā)表于:8/9/2016 孫振元:A MEMS Based Electrochemical Seismometer with central Working Frequency under 1HZ and Ultra-low Self-noise 孫振元:A MEMS Based Electrochemical Seismometer with central Working Frequency under 1HZ and Ultra-low Self-noise 發(fā)表于:8/9/2016 李鳳蓉:Design of Multiband Reconfigurable UWB Microstrip Antenna with MEMS Switches 李鳳蓉:Design of Multiband Reconfigurable UWB Microstrip Antenna with MEMS Switches 發(fā)表于:8/9/2016 林聰:The Conical Conformal MEMS Quasi End-Fire Array Antenna 林聰:The Conical Conformal MEMS Quasi End-Fire Array Antenna 發(fā)表于:8/9/2016 蔣淑蘭:單晶硅表面摩擦誘導(dǎo)選擇性刻蝕研究 蔣淑蘭:單晶硅表面摩擦誘導(dǎo)選擇性刻蝕研究 發(fā)表于:8/9/2016 宋暢:電鑄金屬微器件殘余應(yīng)力研究 宋暢:電鑄金屬微器件殘余應(yīng)力研究 發(fā)表于:8/9/2016 ?…78910111213141516…?