9.2.1 Features of Adaptive Filters -COP Q&A for understanding "COP" Q:What should be considered for choosing a proper COP? (1)The choice of the criterion is a balanced compromise between what is acceptable to the user of the application and what is mathematically tractable; (2)In other words,the COP can be manipulated to derive an adaptive algorithm; (3)Most adaptive filters use a certain average form of the square error. Q: What should be considered for choosing a proper COP? (1) The choice of the criterion is a balanced compromise between what is acceptable to the user of the application and what is mathematically tractable; (2)In other words, the COP can be manipulated to derive an adaptive algorithm; (3)Most adaptive filters use a certain average form of the square error. 9.2.1 Features of Adaptive Filters － COP Q&A for understanding “COP