Patent ID: 8792599
Filing Date: 2014-07-29
Classification: H04B

Abstract:
1. A diversity reception device comprising: a plurality of antennas configured to receive digital broadcast waves; an antenna switching unit configured to select and switch to a determined plural number of antennas out of the plurality of antennas; a determined plural number of tuner units and a determined plural number of demodulation units, each of the tuner units and demodulation units corresponding to each of antennas selected by the antenna switching unit, configured to receive respective input of received signals of the selected antennas; a diversity combining unit configured to perform diversity combining on outputs of the determined plural number of demodulation units as outputs of plural chains; and an antenna interchange control unit configured to control the antenna switching unit to interchange an antenna; wherein each of the demodulation units includes a demodulation circuit configured to measure a carrier-to-noise ratio of its received signal in the process of demodulating and a level detection unit configured to measure an input level of its received signal, each of the tuner units includes a gain control unit configured to control gain in its received signal, the antenna interchange control unit compares the carrier-to-noise ratio measured by the demodulation circuit of each chain among the plural chains and controls the antenna switching unit to sequentially switch connection with an antenna connected to a chain having a lowest carrier-to-noise ratio to connection with antennas connectable to said chain, during the diversity combining, the level detection unit measures the input level for each of the connection-switched antennas, in the state where each connection-switched antenna is connected to the chain having the lowest carrier-to-noise ratio, and the antenna interchange control unit