Patent ID: 8233868

Claim:
A radio receiver device comprising: a radio signal processing means configured to convert a plurality of received radio signals into a corresponding plurality of converted digital signals and to demodulate the plurality of converted digital signals; a signal-to-noise (S/N) ratio detecting means configured to detect a plurality of S/N ratios corresponding to the plurality of radio signals by analyzing the plurality of converted digital signals; a S/N ratio checking means configured to check whether the plurality of S/N ratios are lower than a predetermined threshold level for the plurality of received radio signals; a cause checking means configured to check whether the plurality of S/N ratios have been lowered by digital noise generated during digital processing when the S/N ratio of each of the plurality of radio signals received through a plurality of channels is lower than the predetermined threshold level with respect to a same frequency at a same time; and a digital processing means configured to digitally process the plurality of converted digital signals and to switch over an operation mode of digital processing thereof based on the plurality of S/N ratios detected by the S/N ratio detecting means, thereby controlling the digital noise generated during the digital processing, wherein the digital processing means switches over the operation mode by changing a frequency of an operating clock thereof.