V-Tec AT16/C5 Spécifications Page 42
- Page / 94
- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Si2400
42 Rev. 1.3
7.2. Call Progress Filters
The programmable call progress filter coefficients are
located in DSP address locations 0x0010 through
0x0023. There are two independent 4th 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 as
w[n] = k0
z
x[n] + a1
z
w[n – 1] + a2
z
w[n – 2]
y[n] = w[n] + b1
z
w[n – 1] + b2
z
w[n – 2].
The output of the filters is input to an energy detector
and then compared to a fixed threshold with hysteresis
(DSP register CPDL). Defaults shown are a bandpass
filter from 290–630 Hz (–3 dB). These registers are
located in the DSP and thus must be written in the same
manner described in “DSP Registers”.
The filters may be configured in either parallel or
cascade through SE6[6] (CPCD) with SE8 = 0x02, and
the output of filter B may be squared by selecting
SE6[7] (CPSQ) = 1
b
. Figure 13 shows a block diagram
of the call progress filter structure.
Figure 13. Programmable Call Progress Filter Architecture
Table 26. 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
Filter B
Energy
Detect
1
1
0
1
0
Filter A
Filter Input
y = x
2
CPSQ
Energy
Detect
0
CPCD
Max
(A,B)
Hysteresis
A > B?
20log 10 (4096/CPDL) –34 dBm
TDET
A
B
A
B
CPCD
0
- Features 1
- Applications 1
- Description 1
- Functional Block Diagram 1
- 2 Rev. 1.3 2
- TABLE OF CONTENTS 3
- 1. Electrical Specifications 4
- Table 2. Loop Characteristics 5
- Table 3. DC Characteristics 6
- Table 4. DC Characteristics 6
- Table 5. AC Characteristics 7
- for K-Grade, T 8
- –40 to 85°C for B-Grade) 8
- = –40 to 85°C for B-Grade) 9
- 10 Rev. 1.3 10
- 3. Bill of Materials 11
- 12 Rev. 1.3 12
- 4. Analog Input/Output 13
- 5. Functional Description 14
- 5.1. Digital Interface 15
- 16 Rev. 1.3 16
- 5.3. Low Power Modes 17
- 5.4. Global DAA Operation 17
- 18 Rev. 1.3 18
- Rev. 1.3 19 19
- 20 Rev. 1.3 20
- 5.6. Loop Current Detection 21
- 5.7. Carrier Detect/Loss 21
- 5.8. Overcurrent Detection 21
- 5.11. PCM Data Mode 23
- Figure 10. Signal Routing 24
- 5.12. Analog Codec 25
- 5.14. V.42 HDLC Mode 26
- 5.15. Fast Connect 27
- Table 16. MCKR Configurations 28
- 6.1. Command Line Execution 29
- 30 Rev. 1.3 30
- 6.4. S-Register Control 31
- 32 Rev. 1.3 32
- 6.5.4. A1 34
- 6.5.5. !2 34
- 6.5.6. !7 34
- Table 19. !7 Parameters 35
- Figure 12. !7 Security Timing 36
- Progress 37
- S19 S1A S1B S16 S17 S18 38
- Table 23. DTMF 39
- 7.1. DSP Registers 40
- SE8 SE6 SE5 41
- DSP Reg. Addr 41
- 7.2. Call Progress Filters 42
- 8. S Registers 43
- 44 Rev. 1.3 44
- Rev. 1.3 45 45
- 46 Rev. 1.3 46
- Rev. 1.3 47 47
- 50 Rev. 1.3 50
- Rev. 1.3 51 51
- 52 Rev. 1.3 52
- Rev. 1.3 53 53
- 54 Rev. 1.3 54
- Rev. 1.3 55 55
- 56 Rev. 1.3 56
- 58 Rev. 1.3 58
- Kissoff Tone Detect Length) 58
- Rev. 1.3 59 59
- 60 Rev. 1.3 60
- Rev. 1.3 61 61
- 62 Rev. 1.3 62
- Rev. 1.3 63 63
- Rev. 1.3 65 65
- 66 Rev. 1.3 66
- Rev. 1.3 69 69
- 70 Rev. 1.3 70
- Rev. 1.3 71 71
- 72 Rev. 1.3 72
- Rev. 1.3 73 73
- 74 Rev. 1.3 74
- Rev. 1.3 75 75
- 76 Rev. 1.3 76
- Rev. 1.3 77 77
- DAA Isolation Barrier 78
- Emissions/Immunity 78
- DC Termination 79
- AC Termination 80
- Ringer Impedance 80
- DTMF Dialing 80
- Pulse Dialing 80
- Billing Tone Detection 80
- Symbol Value 81
- In-Circuit Testing 82
- Compliance Test Commands 83
- Introduction 84
- APPENDIX C—UL1950 3RD EDITION 85
- 9. Pin Descriptions: Si2400 86
- Rev. 1.3 87 87
- 10. Pin Descriptions: Si3015 88
- Receive Input 89
- Filter 2 89
- Pin # Pin Name Description 89
- 11. Ordering Guide 90
- Millimeters 91
- Revision 1.1 to Revision 1.2 92
- Revision 1.2 to Revision 1.3 92
- Rev. 1.3 93 93
- CONTACT INFORMATION 94
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