CC-2401K2 Page 28 of 66 2007, Copeland Communications, Inc. CC-2401K2 Datasheet Rev 1.5 Call Progress Filters The programmable call pr" />
參數(shù)資料
型號： CC-2401K2A-CS
廠商： Copeland Communications Inc
文件頁數(shù)： 21/66頁
文件大?。?/td> 0K
描述： MODEM 2400BAUD SECURE 3.3V
標(biāo)準(zhǔn)包裝： 30
數(shù)據(jù)格式： V.21，V.22，V.23，Bell 103
波特率： 2.4k
電源電壓： 3 V ~ 3.6 V
安裝類型： 表面貼裝
封裝/外殼： 模塊
包裝： 散裝
配用： 539-1002-ND - KIT EVALUATION WORLD MODEM II
其它名稱： 539-1010
CC-2401K2A-CS-ND
Data Sheet
CC-2401K2
Page 28 of 66
2007, Copeland Communications, Inc.
CC-2401K2 Datasheet Rev 1.5
Call Progress Filters
The programmable call progress filter coefficients are located in DSP address locations 0x0010 through
0x0023. There are two independent 4
th order filters, A and B, each consisting of two biquads, for a total of 20
coefficients. Coefficients are 14 bits (-8192 to 8191) and are interpreted as, for example, b0 = value/4096,
thus giving a floating point value of approximately -2.0 to 2.0. Output of each biquad is calculated:
w[x] = k0 x x[n] + a1 x w[n - 1] + a2 x w[n - 2]
y[n] = w[n] + b1 x w[n - 1] + b2 x w[n - 2]
The output of the filters is input to an energy detector and then compared to a fixed threshold with hysteresis
(CPDL). Defaults shown are a bandpass filter from 290-630 Hz (03 dB). These registers are located in the
DSP and must be written in the same manner described in “DSP Registers”.
The filters may be confi gured in either parallel or cas cade through SE6[6] (CPCD) with SE8 = 0x02, and the
output filter B may be squared by selecting SE6[7] (CPSQ) = 1.
Call Progress Filters
DSP Register
Address
Coefficient
Default
(dec)
0x0010
A1_k0
256
0x0011
A1_b1
-8184
0x0012
A1_b2
4096
0x0013
A1_a1
7737
0x0014
A1_a2
-3801
0x0015
A2_k0
1236
0x0016
A2_b1
133
0x0017
A2_b2
4096
0x0018
A2_a1
7109
0x0019
A2_a2
-3565
0x001A
B1_k0
256
0x001B
B1_b1
-8184
0x001C
B1_b2
4096
0x001D
B1_a1
7737
0x001E
B1_a2
-3801
0x001F
B2_k0
1236
0x0020
B2_b1
133
0x0021
B2_b2
4096
0x0022
B2_a1
7109
0x0023
B2_a2
-3565
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