| 摘要 |
PROBLEM TO BE SOLVED: To solve such problems that, when radio wave propagation condition is bad, filter characteristic is improved by increasing the number of taps of a channel separation filter of a digital receiver, thereby bringing the filter characteristic close to desired recovery output characteristic, but the number of taps of the channel separation light filter is usually fixed, also the number of tape is increased as a regular use condition and the filter characteristic property is improved, thus it can set so that better demodulation output is obtained even when the radio wave propagation condition is bad, but the throughput is increased and the power consumption of the receiver is increased. SOLUTION: An FFT arithmetic circuit 6 frequency-analyzes output data of an A/D converter 1 and the number of taps in channel separation filters 4a and 4b is adjusted, based on a frequency analysis result. |
