DFB uses Q23 format i.e. 23 bits for decimal points and one for sign.
First coefficient is a negative number. Hence the hexadecimal representation is two's complement of the number in Q23.
coefficient1 => (2^24) – (2^23 * 0.151365399360657)=15507471= 0xECA00E
Third one is a positive decimal number. Just multiply the number by 2^23 to convert to Q23.
coefficient2 => (2^23 * 0.700000047683716)=5872026= 0x59999A