Patent ID: 7881672
Filing Date: 2011-02-01
Classification: H04L

Abstract:
1. A tuner that performs channel select processing to a signal, the tuner comprising: a plurality of circuit elements; a power supply unit that supplies a normal power to each circuit element, and supplies to the circuit element a test power different from the normal power, over a first time period in place of the normal power; a test noise measuring unit that measures the intensity of test noise contained in a signal after channel select processing to be output from the tuner, when the power supply unit supplies the test power over the first time period; a comparing unit that compares the intensity of the test noise measured by the test noise measuring unit with a noise reference value as a reference for update of the normal power; and a power updating unit that updates the intensity of the normal power on the basis of a result of the comparison by the comparing unit, wherein the power updating unit comprising: a power reduction updating section that updates the intensity of the normal power to an intensity not less than the test power and less than the normal power when the power supply unit supplies to each circuit element the test power less than the normal power, over the first time period, and the result of the comparison by the comparing unit indicates that the intensity of the test noise is not more than the noise reference value.