表达式7: "O" equals 2 left parenthesis, "s" Subscript, 1 , Baseline times "m" , right parenthesisO=2s1·m
7
表达式8: "O" Subscript, 1 , Baseline equals 1 half cosine left parenthesis, left parenthesis, 2 pi "f" Subscript, "d" , Baseline "x" , right parenthesis plus left parenthesis, 2 pi "f" Subscript, "m" , Baseline "x" negative 2 pi "f" Subscript, "c" , Baseline "x" , right parenthesis , right parenthesisO1=12cos2πfdx+2πfmx−2πfcx
8
表达式9: "O" Subscript, 2 , Baseline equals 1 half cosine left parenthesis, left parenthesis, 2 pi "f" Subscript, "d" , Baseline "x" , right parenthesis minus left parenthesis, 2 pi "f" Subscript, "m" , Baseline "x" negative 2 pi "f" Subscript, "c" , Baseline "x" , right parenthesis , right parenthesisO2=12cos2πfdx−2πfmx−2πfcx
