A method and system for encoding and decoding an input signal, wherein the input signal is divided into a higher frequency band and a lower frequency band in the encoding and decoding processes, and wherein the decoding of the higher frequency band is carried out by using an artificial signal along with speech related parameters obtained from the lower frequency band. Transparently to the user, the system continuously operates in the background to adapt banner advertisements based on the detection of competing ads. The signals of the respective pixel sensors are then output in a block scanning fashion. At least one of remaining ones of the first and second non-selected bit lines is set into a floating state. The first and the second fixed resistor have the same layer structure. The banknote receiving and storing unit includes a banknote accepting unit, a safe unit, a transporting unit for moving an accepted banknote to a position adjacent the safe unit, a translating unit for non-rotationally displacing the accepted banknote into the storing section of the safe unit, and a driving lever pivoted by a driving crank in the transporting unit to operate the translating unit.