Samsung Electronics Co., Ltd.

Sk Telecom Company, Ltd.

In Sung Choi

Tae Hyung Lee

Jong Ok Kim

Chong Ho Moon

Duk Ju Lee

An image forming apparatus and a method for controlling the same are disclosed. The image forming apparatus supports the printing management function, such that it can continue or cancel the printing operation when a printing-operation change factor occurs during the printing operation established by the user. In the case of using the printing management function, the user can easily stop the printing operation when the erroneous data occurs or he or she desires to cancel the remaining printing operations during the printing operation, such that an amount of resources required for the printing operation can be minimized, resulting in the implementation of increased operation efficiency. The method for controlling the image forming apparatus includes: determining whether the number of printed papers is equal to a predetermined printing-check paper number during a printing operation; and if the number of printed papers is equal to the predetermined printing-check paper number, comparing printing information for each page of printed data with the other printing information for each actually-applied page, and determining the presence or absence of a printing error.

Image forming apparatus and method for controlling the same

A carrier changer and changing method capable of generating a plurality of pseudo carriers by one pseudo carrier generator is provided. In the carrier changer, a pseudo carrier generator selectively generates one of a plurality of forward pseudo carrier signals based on a forward signal by a time division. A forward signal processor receives the forward signal and generates a pseudo carrier generating signal based on the forward signal, and outputs the forward signal and the pseudo carrier signals generated by the pseudo carrier generator. A power amplifier amplifies powers of the forward signal and pseudo carrier signals from the forward signal processor. Since an output of a phase locked loop is generated according to a variable phase locked loop data, pseudo carrier signals having different frequencies can be obtained by one pseudo carrier generator. Since one power amplifier a plurality of pseudo carries signals, additional amplifiers need not being used. Since a plurality of pseudo carrier signals are generated by a time division, insertion loss due to usage of a divider and synthesizer is not generated.

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Seoul, South Korea

In Sung Choi