The present invention relates to a method for removing and recovering CO2 from exhaust gas from a power andor heat generating plant by chemical absorption and desorption respectively, where the exhaust gas is fed to an absorber using a chemical absorbent where the CO2 is absorbed in said absorbent and a CO2-depleted exhaust gas stream is formed. Modifications may be made to the first quote, which lasts at least until a consolidation interval has elapsed. The digital demodulating block includes a channel level comparator, a phase inverter, a signal converter; and an adder.