| 摘要 |
The present invention discloses a device and method for eliminating an interfering wave and determining the best orientation for an antenna. A SAW (surface acoustic wave) filter employed in the invention eliminates an interfering wave (a ground analog broadcasting wave) and extracts a video-signal element of a specified channel (a bandwidth of 6 MHz) from an input intermediate-frequency signal so as to output to an A/D converter. The arrangement of the filter, which is a band pass filter having a comb-shaped attenuation characteristic, is such that the first peak of attenuation is made to coincide with the peak of an interfering signal; the A/D converter produces an AGC feedback signal to output to a high-frequency amplifier, an intermediate-frequency amplifier, and an operation unit, respectively; a waveform equalization unit eliminates a ghost image generated due to multi-path interference from the input signal by using an equalizing method such as a learning equalization, a blind equalization, etc., to output to an error correction unit and, also, to output a filter tap coefficient used for the equalization to the operation unit; and, then, the error correction unit corrects an error of the input signal by using a Read-Solomon code and a Trellis code to output to a demultiplexer and, also, to output the error-rate information of the input signal to the operation unit.
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