Patent ID: 7466965

Claim:
A transmission method of detecting an amplitude component from a modulating signal containing a phase component and said amplitude component, direct-current converting said amplitude component and frequency-converting said modulating signal to high frequency, generating a modulated wave by multiplying said direct-current converted amplitude component by said frequency-converted modulating signal, and correcting by feedback processing, a level of said amplitude component to be direct-current converted, the transmission method comprising the steps of: dividing said amplitude component to be direct-current converted into multiple frequency bands; performing a feedback process not involving frequency conversion for said amplitude component, wherein frequency thereof is selected to fall within at least one first frequency band among said multiple frequency bands; performing a feedback process involving frequency conversion and frequency inversion for said amplitude component, wherein frequency thereof is selected to fall within at least one second frequency band among said multiple frequency bands; and after mutually adding said amplitude components within all of said frequency bands after said feedback process, direct-current converting an added result.