| 摘要 |
PURPOSE: The anti imaging filter for supporting various interpolation rates in digital radio systems is provided to support various interpolation rates with a single filter by executing decimation when interpolation rates for an anti imaging filter to remove images according to the variations of a date rate are expressed in the form of 2's exponents. CONSTITUTION: The anti imaging filter for supporting various interpolation rates consists of an input routing part(10), a polyphase filter(20) and an output routing part(30). The input routing part(10) determines whether the use of a subfilter of the polyphase filter(20) is needed, according to an interpolation rate, and executes routing for an input signal. The polyphase filter(20) is composed of a plurality of subfilters(20-0-20-L-1), of which the on/off operations are determined according to an interpolation rate. An on/off operation determined subfilter executes decimation by multiplying a tap coefficient stored in a register for the signal inputted through the input routing part(10). The output routing part(30) routes an output signal by adding and commutating decimation signals output through a subfilter in service.
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