参数资料
型号: COREFIR-RM
厂商: Microsemi SoC
文件页数: 9/67页
文件大小: 0K
描述: IP MODULE COREFIR
标准包装: 1
系列: *
Introduction
x(i)
h 0
h 1
h 2
h 3
z -2
h 4
h 5
h 6
h 7
z -2
h 8
h 9
h 10
h 11
z -2
h 12
h 13
h 14
h 15
z -1
z -1
z -1
y(i)
Figure 4 · 16-Tap Polyphase Interpolation Filter, L = 4
Polyphase Decimation Filter
The motivation for decimation is to reduce the cost of processing: the calculation to implement a DSP
system, generally is proportional to the sampling rate, so the use of a lower sampling rate usually results in a
cheaper implementation.
The decimation factor is simply the ratio of the input rate to the output rate. It is usually symbolized by "M",
so input rate/output rate = M.
If a signal is defined by N samples, M:1 decimation is achieved by throwing away M – 1 samples after every
sample kept In an M:1 decimator, the output data rate is 1/M times the input data rate, and M is the
decimation factor.
?? ( ?? ) = ∑ ???? ?? ( ?? ) ? ? [ ???? ? ?? ]
10
The output Y is given by EQ 5 .
Y (n) is discarded for n != 0, M, 2*M, 3*M etc.
EQ 5
CoreFIR v8.5 Handbook
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