本文在对声频范畴中的模拟噪声进行数学分析的基础上，针对模拟噪声数控输出专题，提出解决问题的工程数学模型，设计成功一种新颖、简洁、适用的数控输出电路．从理论和实践两方面论证了这种创新的合理性、科学性．同时指出这种新型电路在各种Ｄ／Ａ转换场合的普遍通用性． Based on the mathematic analysis of analog noise in the audio domain, aiming at the problem of analog output of NC, a mathematical model of engineering problem solving is proposed. A novel, concise and applicable NC output circuit is designed successfully. The rationality and scientificity of this kind of innovation are demonstrated from two aspects of theory and practice. At the same time pointed out that this new circuit in a variety of D / A conversion of universal universality.