| 摘要 |
PROBLEM TO BE SOLVED: To reduce the capacity of a ROM. SOLUTION: An address conversion circuit 11 divides a 8-bit control signal Θdenoting a phase error of 0-2π into a high-order 2-bit conversion control signal and a low-order 6-bit address Θ' of 0-π/2. A 0-π/2 since ROM 12 and a cosine ROM 13 respectively output sine data and cosine data according to the address Θ'. The sign data and the cosine data outputted from the sign ROM 12 and the cosine ROM 13 are outputted on the basis of a conversion control signal as they are or replaced or inverted to obtain the sine data and the cosine data corresponding to the control signal 0-2π. |
