Mitsubishi Electric Corporation

Eiji Arita

Jun Ido

Mitsuru Takeuchi

Hiroyuki Nagahama

Naotoshi Maeda

Akiko Maeno

A receiveris comprised of a first frequency changing circuitfor converting a received signal including two or more broadcast waves into a first intermediate frequency signal with a local oscillation, a band separation filterconsisting of a multistage FIR type filter for allowing bands included in the two or more broadcast waves converted into the above-mentioned first intermediate frequency signal to pass therethrough simultaneously, and a second frequency changing circuitfor converting the received signal which is outputted by the above-mentioned band separation filterand which is limited to the above-mentioned two or more broadcast waves which the receiver desires to receive into a second intermediate frequency signal from which each of the broadcast waves can be sampled at a frequency at which the broadcast waves do not interfere with one another.

Receiver

A receiveris comprised of a first frequency changing circuitfor converting a received signal including two or more broadcast waves into a first intermediate frequency signal with a local oscillation, a band separation filterfor allowing bands included in the two or more broadcast waves converted into the first intermediate frequency signal to pass therethrough simultaneously, and a second frequency changing circuitfor converting the received signal which is outputted by the band separation filterand which is limited to the two or more broadcast waves into a second intermediate frequency signal from which each of the broadcast waves can be sampled at a frequency at which the broadcast waves do not interfere with one another.

A digital broadcasting receiving apparatus is characterized in that the digital broadcasting receiving apparatus is provided with an antenna combination determination processing unit for selecting at least two antennas from among a plurality of antennas which have directivities in different directions and each of which receives a digital broadcasting wave transmitted from outside the digital broadcasting receiving apparatus, and for providing an instruction for switching among the above-mentioned plurality of antennas on the basis of a state of reception of the digital broadcasting waves received by the selected antennas, and switches for switching among the above-mentioned plurality of antennas according to the instruction from the above-mentioned combination determination processing unit.

Digital broadcasting receiving apparatus

A diversity receiver is provided with antennas () and () in a first branch and antennas () and () in a second branch each of which antenna gains is controlled so that the offset between the directions of directional radiation patterns for the first and second branches becomes approximately &#x3c0;/2. Thereby, the diversity receiver can obtain a sufficient diversity gain even when it is incorporated into an indoor television with the antennas being built thereinto in close vicinity to one another.

Diversity receiver

The present invention relates to a OFDM signal receiver device that performs weighting for branch metrics based on average noise power or signal-to-noise power ratio and conducts Viterbi decoding based on the result of the weighting. In the present invention, based on a demodulated signal, electric power corresponding to a noise component contained in the demodulated signal is calculated. A noise power signal corresponding to the result of the calculation is output from a noise power-calculating unit. Based on the noise power signal and a transmission channel characteristic corresponding to a subcarrier component that is output from an interpolation filter unit, a weighing factor for a branch metric is calculated by a weighting factor-calculating unit, and based on the weighting factor, the demodulated signal is decoded by decoding unit

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Tokyo, Japan

Eiji Arita