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本文在讨论带通抽样理论的基础上,使用TI公司DSP_C54X和AD/DA转换芯片构成窄带中频抽样系统,对普通AM接收机的中频输出进行了欠抽样处理,完成了中频调制信号的解调、滤波和输出功能。
Based on the discussion of band-pass sampling theory, this paper uses TI’s DSP_C54X and AD / DA converter chips to form narrow-band IF sampling system. The intermediate-frequency output of ordinary AM receiver is under-sampled to complete the demodulation of IF modulation signal, Filter and output functions.