参数资料
型号: TLC32047I
厂商: Texas Instruments, Inc.
英文描述: Wide-Band Analog Interface Circuit
中文描述: 宽带模拟接口电路
文件页数: 34/61页
文件大小: 303K
代理商: TLC32047I
2–16
Table 2–6. (sin x)/x Correction Table for f
s
= 8000 Hz and f
s
= 9600 Hz
ROLL-OFF ERROR (dB)
fs
p1 = –0.14813
p2 = 0.9888
ROLL-OFF ERROR (dB)
fs = 9600 Hz
p1 = –0.1307
p2 = 0.9951
f (Hz)
300
–0.099
–0.043
600
–0.089
–0.043
900
–0.054
0
1200
–0.002
0
1500
0.041
0
1800
0.079
0.043
2100
0.100
0.043
2400
0.091
0.043
2700
–0.043
0
3000
–0.102
–0.043
2.29 TMS320 Software Requirements
The digital correction filter equation can be written in state variable form as follows:
y
(i+1)
= y
(i)
×
k1
+ u
(i+1)
×
k2
where
k1 = p1
k2 = (1 – p1)p2
y(i) is the filter state
u(i+1)
The coefficients k1 and k2 must be represented as 16-bit integers. The SACH instruction (with the proper
shift) yields the correct result. With the assumption that the TMS320 processor page pointer and memory
configuration are properly initialized, the equation can be executed in seven instructions or seven cycles
with the following program:
ZAC
LT K2
MPY U
LTA K1
MPY Y
APAC
SACH (dma), (shift)
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