2170 Revision History: Previous Version: Page Subjects (major changes

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2170 Revision History: Previous Version: Page Subjects (major changes since last revision) 2000-06-29
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Migration from V1.1 V2.1
Table Contents
Page
Selectable crystal frequencies Revision Register Serial Data Interface Line Echo Canceller Peak Detector Module Speakerphone Module Speakerphone Control Register Speakerphone Registers Noise Reduction Module Universal Tone Detector Caller
Application Note
2000-06-29
2170
Preface
This Application Note intended give advice migration from Acoustic Echo Canceller (PSB 2170) version V1.1 version V2.1 Acoustic Echo Canceller (PSB 2170). modes available V1.1 selected V2.1. Nevertheless software written V1.1 will work with V2.1 because registers parameters have been changed. These changes will discussed following chapters.
Application Note
2000-06-29
2170
Selectable crystal frequencies
Selectable crystal frequencies
With V2.1 crystal frequency 34.560 available. When features version V2.1 additionally used, this frequency recommended. HWCONFIG Hardware Configuration Register
XTAL
SSDI
XTAL
XTAL Frequency
Factor reserved
Description 34.560 31.104 27.648 reserved
factor needed calculate clock frequency AFECLK.
Revision Register
value revision register been changed version V2.1to 0x3300 (read only).
Revision
Application Note
2000-06-29
2170
Serial Data Interface
Serial Data Interface
channel serial data interface splitted into (a-law µ-law coded) channels version V2.1. serial data interface compatible version V1.1.
SDCHN2
Serial Data Interface Channel Reset Value
Channel Split Single single channel adjacent channels (SDCHN2:PCM must
IFS5
Interface Select
Reset Value
signal selection fields IFS5 determine outgoing signal channel IOM/SSDI-interface. enables high-pass incoming signal channel High-Pass Disabled Enabled Input signal Input signal Input signal
Application Note
2000-06-29
2170
Serial Data Interface sources always active, unused sources must (S0). IFG6
ATT3
Interface Gain
Reset Value
ATT3
Attenuation (Channel
order obtain attenuation parameter ATT3 calculated following formula: ATT3
Application Note
2000-06-29
2170
Line Echo Canceller
Line Echo Canceller
There line echo canceller modes available version V2.1. proper echo cancellation either superior extended mode should used. Nevertheless, normal mode compatible version V1.1. LECCTL
Line Echo Cancellation Control Reset Value
Line Echo Canceller Mode
Line echo canceller mode Normal mode Superior mode Extended mode Reserved
Adaptation Stop Adaptation enabled Adaptation stopped Adaptation Speed Fast adaptation (extended mode only) Slow adaptation (extended mode only) Recommended start values module are: Register LECCTL LECLEV LECATT LECMGN Value 0xA041 0x3D8F 0x07F9 0x07F9
data sheet V2.1 (PSB 2170) further information.
Application Note 2000-06-29
2170
Peak Detector
Peak Detector
feature especially optimization implemented version V2.1. peak detector very useful check levels between modules avoid distortion because signal overloads. PDCTL
Peak Detector Control Reset Value
Peak Detector Enable Disabled Enabled
Min/Max Maximum Minimum
Input signal selection PDDATA Peak Detector Data
DATA
DATA Maximum minimum value signal since last read access. Note: This register only read.
Application Note
2000-06-29
2170
Module
Module
additional module implemented version V2.1. This module recommended dynamic compressor receive direction. module should placed front speakerphone module between speakerphone module loudspeaker. Recommended start values module are: Register AGC1 AGC2 AGC3 AGC4 AGC5 Value 0x1087 0x7FFF 0x8F01 0x20E7 0x0080
data sheet V2.1 (PSB 2170) further information.
Application Note
2000-06-29
2170
Speakerphone Module
Speakerphone Module
speakerphone partially redesigned. modes were implemented existing modes improved. result, some registers have been changed completely. This must considered migration version V2.1.
Speakerphone Control Register
SCTL register been changed, because modes available version V2.1. Please refer following table compatible modes. Echo Canceller Mode Echo cancellation disabled (half duplex) Subband, Fullband mode Fullband mode Subband, reduced filter length Subband, analog line mode Subband, ISDN mode Subband, enhanced mode
V1.1
V2.1
used with version V2.1, register SAEDTL programmed when algorithm should react compatible version V1.1.
Speakerphone Registers
improvement speakerphone algorithm, some parameters version V1.1 have become obsolete version V2.1. other hand, parameters available version V2.1 because features like noise reduction were implemented. result, some registers were shifted. following table gives overview changes. Description V1.1 register name SAELEN
V2.1 address register name 0x80 SATT2.DS 0xFF SAELEN SAEAW
address 0x73 0x7F 0x80
2000-06-29
Speakerphone Control Parameters Speakerphone: Disable idle mode1) Filter length acoustic echo canceller (AEC) Adaptation Window
Application Note
2170
Speakerphone Module Description limit
V1.1 register name SAEATT SCDT
V2.1 address register name 0x81 0x99 SAEEL SAEDTR SAEDTL SAEDTI SAEDTD
address 0x81 0x82 0x83 0x84 0x85
Double Talk Reduction Double talk reduction Double talk limit Double talk reduction increment Double talk reduction decrement Scaling global scale partial scale first block Wiener Filter Wiener filter limit Wiener filter transition time Noise Reduction Noise reduction attenuation Noise reduction lower noise limit Noise reduction upper noise limit Comfort Noise Double Talk Detection Double Talk Detection threshold Double Talk Sensitivity Double Talk Limit Attenuation Noise Attenuation Sensitivity Attenuation Limit SCDT SCDTN SCDTS SCDTL SCATTN SCATTS SCATTL 0x99 0x9A 0x9B 0x9C 0x9D 0x9E 0x9F SAEDTL SCDTN SCDTS SCDTL SCATTN SCATTS SCATTL 0x83 0x99 0x9A 0x9B 0x9C 0x9D 0x9E SNRATT SNRLNL SNRUNL 0x87 0x88 0x89 SAEWFL SAEWFT 0x85 0x86 SAEWFL 0x86
SAEGS SAEPS SAEBL
0x82 0x83 0x84
Application Note
2000-06-29
2170
Speakerphone Module Description Loudspeaker Sensitivity Loudspeaker Sensitivity Loudspeaker Sensitivity Comfort noise constant level Comfort noise factor Comfort noise pass Single Talk Attenuation Global attenuation Single talk time
V1.1 register name SCLSPN SCLSPS SCLSPL SCCN1 SCCN2 SCCN3 SCAECL SCSTGP SCSTATT SCSTS SCSTTIM
V2.1 address register name 0xA8 0xA9 0xAA 0xAB 0xAC 0xAB 0xA0 0xA1 0xA2 0xA4 0xA5 0xA6 0xA7 SCLSPN SCLSPS SCLSPL SCCN1 SCCN2 SCCN3
address 0x9F 0xA0 0xA1 0xA2 0xA3 0xA4
Singe talk attenuation Singe talk time
Single talk sensitivity Singe talk attack speed
SCSTIS
Single talk decay speed SCSTDS
feature version V2.1 only effective fullband mode only active, comfort noise enabled always active; even fullband modes obsolete improved algorithm
Application Note
2000-06-29
2170
Noise Reduction Module
Noise Reduction Module
feature implemented version V2.1. noise reduction module used with speakerphone modes. mode bits this module must used speakerphone mode. NRCTL
Noise Reduction Control Reset Value
Noise Reduction Enable Disabled Enabled
Speakerphone Mode Dependence
Speakerphone Mode Fullband mode Fullband mode Subband mode Fullband mode Fullband mode Subband mode Fullband mode Fullband mode Description Number taps must restricted allowed allowed allowed Number taps must reduced Mode "RNR" must selected There must disabled (ISDN mode): DTMF, CPT, detectors, CID, Number taps 645, there must disabled (ISDN mode): DTMF, CPT, detectors, CID, Subband modes "Normal", "Reduced" "RNR" allowed, there must disabled (ISDN mode): DTMF, CPT, detectors, CID, reserved
Subband mode
Input signal selection
Application Note
2000-06-29
2170
Noise Reduction Module
NRATT
NRATT
Noise Reduction Attenuation
NRATT
Noise Reduction Attenuation
maximum attenuation ([dB]) noisy frequencies performed noise reduction unit calculated following formula: NRATT 32768
Application Note
2000-06-29
2170
Universal Tone Detector
Universal Tone Detector
universal tone detector implemented version V2.1. Please refer data sheet V2.1 (PSB 2170) further information.
Caller
additional caller mode, Bellcore compliant mode, implemented version V2.1. standard mode been changed. CIDCTL0
DATA
Caller Control Reset Value
Enable Disabled Enabled
Drop Tolerance Drop during mark seizure sequence aborts recognition Drop tolerance during mark seizure sequence.
Compatibility Mode Standard Caller Decoder Improved Caller Decoder (Bellcore compliant)
Application Note
2000-06-29
Total Quality Management
eine umfassende Bedeutung. wollen allen Ihren Weise gerecht werden. geht also nicht unsere Anstrengungen gelten Logistik, Service Support sowie allen sonstigen Beratungs- Betreuungsleistungen. Dazu eine bestimmte Geisteshaltung unserer Mitarbeiter. Total Quality Denken Handeln Kollegen, Lieferanten Ihnen, unserem Kunden. Unsere Leitlinie jede Aufgabe ,,Null Fehlern" offener Sichtweise auch eigenen Arbeitsplatz hinaus verbessern. Unternehmensweit orientieren dabei auch ,,top" (Time Optimized Processes), Ihnen durch Schnelligkeit entscheidenden Wettbewerbsvorsprung verschaffen. Geben Chance, hohe Leistung durch umfassende beweisen. werden Quality takes allencompassing significance Semiconductor Group. means living each every your demands best possible way. only concerned with product quality. direct efforts equally quality supply logistics, service support, well other ways which advise attend you. Part this very special attitude staff. Total Quality thought deed, towards co-workers, suppliers you, customer. guideline everything with zero defects", open manner that demonstrated beyond your immediate workplace, constantly improve. Throughout corporation also think terms Time Optimized Processes (top), greater speed part give that decisive competitive edge. Give chance prove best performance through best quality will convinced.
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