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PDF PSB4860 Data sheet ( Hoja de datos )
| Número de pieza | PSB4860 | |
| Descripción | Digital Answering Machine with Full Duplex Speakerphone SAM EC | |
| Fabricantes | Siemens Semiconductor Group | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PSB4860 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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ICs for Communications
Digital Answering Machine with Full Duplex Speakerphone
SAM EC
PSB 4860 Version 2.1
Data Sheet 10.97
DS 1
1 page  
PSB 4860
List of Figures
Page
General
Figure 1:
Figure 2:
Figure 3:
Figure 4:
Figure 5:
Figure 6:
Pin Configuration of PSB 4860. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Logic Symbol of PSB 4860. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Block Diagram of PSB 4860 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Analog Full Duplex Speakerphone with Digital Answering Machine . . . . 20
Featurephone with Answering Machine for ISDN Terminal . . . . . . . . . . . 21
DECT Basestation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Functional Units
Figure 7: Functional Units - Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 8: Functional Units - Recording a Phone Conversation . . . . . . . . . . . . . . . . 25
Figure 9: Functional Units - Simultaneous Internal and External Call . . . . . . . . . . . 26
Figure 10: Speakerphone - Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 11: Speakerphone - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 12: Echo Cancellation Unit - Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 13: Echo Cancellation Unit - Typical Room Impulse Response . . . . . . . . . . . 29
Figure 14: Echo Suppression Unit - States of Operation. . . . . . . . . . . . . . . . . . . . . . 30
Figure 15: Echo Suppression Unit - Signal Flow Graph . . . . . . . . . . . . . . . . . . . . . . 31
Figure 16: Speech Detector - Signal Flow Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 17: Speech Comparator - Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 18: Speech Comparator - Interdependence of Parameters . . . . . . . . . . . . . . 36
Figure 19: Echo Suppression Unit - Automatic Gain Control. . . . . . . . . . . . . . . . . . . 39
Figure 20: Line Echo Cancellation Unit - Block Diagram. . . . . . . . . . . . . . . . . . . . . . 42
Figure 21: DTMF Detector - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 22: CNG Detector - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 23: Alert Tone Detector - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 24: CPT Detector - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 25: CPT Detector - Cooked Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 26: Caller ID Decoder - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 27: DTMF Generator - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 28: Speech Coder - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 29: Speech Decoder - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Figure 30: Analog Front End Interface - Block Diagram . . . . . . . . . . . . . . . . . . . . . . 55
Figure 31: Digital Interface - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Figure 32: Universal Attenuator - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Figure 33: Automatic Gain Control Unit - Block Diagram . . . . . . . . . . . . . . . . . . . . . 59
Figure 34: Equalizer - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Memory Management
Figure 35: Memory Management - Data Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Figure 36: Memory Management - Directory Structure . . . . . . . . . . . . . . . . . . . . . . . 63
Figure 37: Audio File Organization - Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Figure 38: Binary File Organization - Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Semiconductor Group
5
10.97
5 Page 
PSB 4860
Overview
1 Overview
GGeenneerraall
Combined with an analog front end the PSB 4860 provides a solution for embedded or
stand alone answering machine applications. Together with a standard microcontroller
for analog telephones these two chips form the core of a featurephone with full duplex
speakerphone and answering machine capabilities.
The chip features recording by DigiTape™, a family of high performance algorithms.
Messages recorded with DigiTape™ can be played back with variable speed without
pitch alteration. Messages recorded with a higher bitrate can be converted into
messages with a lower bitrate arbitrarily. Current members of DigiTape (TM) span the
range from 3.3 kbit/s to 10.3 kbit/s.
Furthermore the PSB 4860, V2.1 has a full duplex speakerphone, a caller ID decoder,
DTMF recognition and generation and call progress tone detection. The frequency
response of cheap microphones or loudspeakers can be corrected by a programmable
equalizer.
Messages and user data can be stored in ARAM/DRAM or flash memory which can be
directly connected to the PSB 4860. The PSB 4860 also supports a voice prompt
EPROM for fixed announcements.
The PSB 4860 provides an IOM®-2 compatible interface with two channels for speech
data.
Alternatively to the IOM®-2 compatible interface the PSB 4860 supports a simple serial
data interface (SSDI) with separate strobe signals for each direction (linear PCM data,
one channel).
A separate interface is used for a glueless connection to the PSB 4851.
The chip is programmed by a simple four wire serial control interface and can inform the
microcontroller of new events by an interrupt signal. For data retention the PSB 4860
supports a power down mode where only the real time clock and the memory refresh (in
case of ARAM/DRAM) are operational.
The PSB 4860 supports interface pins to +5 V levels.
Semiconductor Group
11
10.97
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet PSB4860.PDF ] | |
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