PSB4860 Ver la hoja de datos (PDF) - Infineon Technologies

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PSB4860

ICs for Communications Sophisticated Answering Machine with Echo Cancellation SAM-EC

Infineon Technologies 

PSB 4860

Figure 1: Pin Configuration of PSB 4860. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 2: Logic Symbol of PSB 4860. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 3: Block Diagram of PSB 4860 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 4: Analog Full Duplex Speakerphone with Digital Answering Machine . . . . 20

Figure 5: Stand-Alone Answering Machine with Data Access via SCI . . . . . . . . . . 21

Figure 6: Featurephone with Answering Machine for ISDN Terminal . . . . . . . . . . . 22

Figure 7: DECT Basestation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 8: Functional Units - Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 9: Functional Units - Recording a Phone Conversation . . . . . . . . . . . . . . . . 27

Figure 10: Functional Units - Simultaneous Internal and External Call . . . . . . . . . . . 28

Figure 11: Speakerphone - Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 12: Speakerphone - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 13: Echo Cancellation Unit - Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 14: Echo Cancellation Unit - Typical Room Impulse Response . . . . . . . . . . . 31

Figure 15: Echo Suppression Unit - States of Operation. . . . . . . . . . . . . . . . . . . . . . 32

Figure 16: Echo Suppression Unit - Signal Flow Graph . . . . . . . . . . . . . . . . . . . . . . 33

Figure 17: Speech Detector - Signal Flow Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 18: Speech Comparator - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 19: Speech Comparator - Acoustic Echoes . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 20: Speech Comparator - Interdependence of Parameters . . . . . . . . . . . . . . 39

Figure 21: Echo Suppression Unit - Automatic Gain Control. . . . . . . . . . . . . . . . . . . 42

Figure 22: Line Echo Cancellation Unit - Block Diagram . . . . . . . . . . . . . . . . . . . . . . 45

Figure 23: Line Echo Cancellation Unit - Superior Mode with Shadow FIR . . . . . . . 46

Figure 24: DTMF Detector - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Figure 25: CNG Detector - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Figure 26: Alert Tone Detector - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Figure 27: Universal Tone Detector - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . 51

Figure 28: CPT Detector - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Figure 29: CPT Detector - Cooked Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Figure 30: Caller ID Decoder - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Figure 31: Caller ID Sender - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Figure 32: DTMF Generator - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Figure 33: Speech Coder - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Figure 34: VOX Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Figure 35: Speech Decoder - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Figure 36: Analog Front End Interface - Block Diagram . . . . . . . . . . . . . . . . . . . . . . 69

Figure 37: Digital Interface - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Figure 38: Universal Attenuator - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Figure 39: Automatic Gain Control Unit - Block Diagram . . . . . . . . . . . . . . . . . . . . . 73

Figure 40: Equalizer - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Figure 41: Peak Detector - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Figure 42: Memory Management - Data Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Figure 43: Memory Management - Structure of Message Directory . . . . . . . . . . . . . 79

Data Sheet

5

2000-01-14

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