Technics MT5634SMI-92 +VSM=? Report Voice Compression Method, At+Vsm=?, Identifier Description

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Chapter 6 – Voice Commands

<cml> is used by the PC to select a compression method. The valid range of values is from 128– 256. The range of values from 0–127 is reserved for future standards.

<vsr> is used to select the modem voice sampling rate from the set of those supported. The unit of measure is samples per second. See the +VSM=? command for the list of sampling rates supported by the modem.

<scs> has different meanings in voice transmit and voice receive modes. In receive, the PC uses <scs> to select greater amounts of compression activity; larger <scs> values mean that the PC wants the modem to treat noisier conditions as silence. There is no unit of measure for this parameter; it merely represents a number in a range. 0 disables modem silence compression.

In voice transmit mode, the PC signals the modem that the data stream was recorded with silence compression by selecting a non-zero value from within the valid range (the same value as receive). Unpredictable results can occur if you 1) enable silence compression for transmitting a voice data stream that was not recorded with silence compression enabled, or 2) you disable silence compression for transmitting a voice data stream that was recorded with silence compression enabled. You can modify the silence expansion with the <sel> parameter. The range of valid values is 0–255. The modem may limit silence compression sensitivity to a narrower range (e.g., 120–128). A setting of <scs>=0 disables silence compression.

<sel> is used to modify the amount of silence expansion. This parameter represents the minimum amount of silence that the modem will expand a period of silence that was previously deleted with a non-zero <sel> parameter. A setting of <sel>=0 means the modem will not modify the silence expansion. The valid range of values is ____ - ____ in 0.1second increments. The modem ignores

the <sel> parameter if the <scs> parameter is 0 (silence compression disabled).

Command:

+VSM=?

Report Voice Compression Method

Result Codes:

OK

 

Description:

The +VSM=? command reports several compression method identifiers in one of two ways: either

 

1) a compression method (for PCM coding) from the table below, or 2) a co-operative identifier

 

(non-PCM coding) used with other manufacturer's equipment.

 

Example: The following shows an inquiry about the modem support of compression and other

 

data. In this example, the modem reports that it supports two compression methods.

 

AT+VSM=?

 

 

128,"SIGNED PCM",12,0,(7200-8000,11025),(127-129),(0-50)

 

132,"ADPCM/AQ",2,40,(7200),(128),(0-50)

 

The compression method identifiers for PCM coding display the general classification of the

 

compression method in the form <cmid>.

 

Non-PCM coding reports the compression method identifiers in the form <cmid>/<author>, where

 

<cmid> is the general classification of the compression method and <author> is the source of the

 

method. The source <author> may be a proprietary method or it may reference a published

 

standard. Each field limit is 20 characters. The +VXT command starts a translation to or from a

 

particular manufacturer's proprietary voice data stream format to an unsigned (non-PCM) format.

 

Identifier

Description

 

Signed PCM

Linear PCM sampling using twos complement signed numbers

 

Unsigned PCM

Linear PCM sampling using unsigned numbers

 

A-Log/Author

Compression using a-law

 

U-Log/Author

Compression using u-law

 

DPCM/Author

Differential Pulse Coded Modulation

 

DPCMAQ/Author

Differential Pulse Coded Modulation with Adaptive Quantizier

 

ADPCM/Author

Adaptive Differential Pulse Coded Modulation

 

VSELP/Author

Vector Sum Exited Linear Predictor

 

RELP/Author

Residual Exited Linear Predictor

 

CELP/Author

Code Book Exited Linear Predictor

 

CVSD/Author

Continuously Variable Slope Delta Modulation

 

TDHS/Author

Time Domain Harmonic Distortion

 

ADM/Author

Adaptive Delta Modulation

 

DM/Author

Delta Modulation

 

APC/Author

Adaptive Predictive Coding

 

ATC/Author

Adaptive Transform Coding

 

SBC/Author

Sub-Band Coding

 

GSM/Author

Regular Pulse Exitation Long-term Predictor (RPELTP)

 

LPC/Author

Linear Predictive Coding

 

EAPDPCM/Author

Embedded Bit ADPCM

SocketModem Global MT5634SMI Developer’s Guide

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Contents MT5634SMI-34 MT5634SMI-92 Revisions Table of Contents Multi-Tech’s Flash Programming Protocol Appendix C Country Configuration and Result Codes Index Product Description Specifications IntroductionProduct Description Features Matrix MT5634SMITechnical Specifications and Features TIA/EIA TR29.2MT5634SMI-IT-92 Industrial Temperature 3.3V Build Option StandardMechanical Specifications Physical Dimensions All ModelsPin Configurations Pin # Signal Name I/O Type DescriptionDigital Ground Active High DCD status Tip Signal from TelcoRing Signal from Telco Active High RDX statusINT Pin # Signal Description NameDgnd GND VCC PWRElectrical Characteristics Electrical CharacteristicsTiming Requirements for Parallel Write Handling PrecautionsTiming Requirements Timing Requirements for Parallel ReadSocketModem Parallel Interface a Programmer’s Description SocketModem Parallel Interface Internal RegistersSocketModem Mimic MMM Operation Register Name Register Description Host Access Internal Registers Time Out InterruptsRegister Functional Descriptions Special Register Set Note *2RBR Receive Buffer RX Fifo IER Interrupt EnableBit Priority Interrupt Source Interrupt Reset Control THR Transmit Holding Register TX FifoFCR Fifo Control LCR Line ControlMCR Modem Control LSR Line Status MSR Modem StatusDLM Divisor Latch MSByte SCR ScratchDLL Divisor Latch LSByte Baud Rate Clock Divisor Decimal DLM Value HEX DLL Value HEXAT Commands, S-Registers Result Codes AT Command SummaryModulation Handshake Set Register ValueDial string modifiers AT CommandsEnter Key DS= y Dial Stored Telephone NumberReturn Online to Data Mode Sr= n Set Register Value Sr?XON/XOFF Pacing Control Zy=x Store Dialing Command \An Select Maximum MNP Block Size\Bn Transmit Break \Kn Break Control \Nn Error Correction Mode Selection\Tn Inactivity Timer Data mode. The modem receives the break from the computerDCn AT Command Control \Xn XON/XOFF Pass-Through$EBn Asynchronous Word Length $RPn Ring Priority vs. AT Command Priority$Dn DTR Dialing $MBn Online BPS Speed#CBIn Local Callback Inactivity Timer #CBDn Callback DelayCallback Failed Attempts Reset #CBNy=x Store Callback PasswordEscape AT Commands Subparameters Commands+MS= Modulation Selection Modulation Possible rates bps1Mod value Valid maxrate values bps +PCW=n Call Waiting Enable+PMH=n Modem on Hold Enable +PIG=n PCM Upstream Ignore+PMHT=n Modem on Hold Timer +PMHF V.92 Modem Hook Flash+PMHR=n Modem on Hold Initiate +PQC=n Quick Connect Control +VCID=n Caller ID Selection#Sx Enter Setup Password #S=x Store Setup PasswordRegister Unit Range Default Description RegistersS38 S48=7 S48=128Result Codes Terse Verbose Description111 Voice Commands Voice Commands Commands That Change for Voice Mode SupportVoice S-Register Summary Command Description Voice +V Commands SummaryVoice +V Commands Detail +FCLASS= mode Enter Select Modem Operating ModeTouch Tone Signals Digit Low frequency High frequency AT+FCLASS=? Enter Display Service Class Capabilities+FCLASS=8 Dtmf Detect Detect and Control Dtmf +FMM?Enter Report Product ID +VNH=hookEnter Automatic Hang-Up Control+FMI?Enter Report Manufacturers ID +FMR?Enter Report Version Level+VTS=string Produce Dtmf and Tone Generation in Voice Mode Enter Voice Receive StateStart Voice Transmission Process +VTS=? Report Frequency SupportAT+VTS=? +VGR=gain Set the Gain for Received Voice Samples +VLS=label Select Analog Source/Destination +VGT=level Set the Volume for Transmitted Voice Samples +VIT=timer Set DTE/DCE Inactivity Timer Code Description+VRA=interval Set Ring Back Goes Away Timer +VRN=interval Set Ring Back Never Appeared Timer +VSD=sds,sdi Set Silence Detection Sensitivity+VSM=cml,vsr,scs,sel Select Voice Compression Method +VSM=? Report Voice Compression Method AT+VSM=?Identifier Description Enable Report Description +VDT=enable,report Control Tone Cadence ReportingLsltcq +VEM=mask Event Reporting and Masking +VEM=? Report Event Reporting and Masking Capabilities+VBT=? Report Modem Flow Control Assert and Deassert Points Interface Configuration Commands+VPP=enable Enable or Disable Voice Mode Packet Protocol AT+VBT=?Voice Mode Result Codes Flow Control+VPR=rate Select DTE/DCE Interface Rate Turn Off Autobaud Unsolicited Voice Mode Result Codes Valid Complex Event Report TagsTag Description Voice Mode Shielded Codes Shielded Code Hex Event Report DescriptionAscii Command Response Sample SessionsSample Rate Selection and Suggested Compression Method DLE ETX AT+VLS=4AT+VTX AT+VLS=0DLE NUL AT+VLS=2AT+VRX AT+VNH=1DTE/DCE Interface Rates Related ManualsAdditional Information Fax Commands Basic Procedure Remote Configuration Country Code ConfigurationRemote Configuration SetupUsing AT Commands Country Code ConfigurationUsing the Global Wizard Utility Country AT Command Result Code Hexadecimal DecimalFirmware Upgrade Procedure Upgrade OverviewUpgrade Steps Extract the Firmware Upgrade .Hex Files Download the Upgrade FileInstall the Flash Wizard Identify the Current Version of the FirmwareUpgrade the Modem’s Firmware Using the Flash WizardRestore Your Parameters Modem Comments Multi-Tech Systems, Inc. Flash Programming ProtocolProgramming the Modem Handshake SequenceOther Supported Boot Code Commands Other Programming ConcernsATI4 Example Extended Address Record in Intel Format Intel Hex FormatData Record Char Pos Field Type Value Description End of File Record Char Pos Field Type Value DescriptionExample End of File in Intel Format Appendix a Mechanical Details Serial Test/Demo Board ComponentsSerial Test/Demo Board Block Diagram 5V / 3.3V Jumper JP1Parallel Test/Demo Board Components Address/COM Port/ IRQ Select Jumpers JP2 and JP3Operating Voltage Select Jumper JP4 Parallel Test/Demo Board Block Diagram Figure A-4. Parallel Test/Demo Board Block DiagramSafety and EMC Approvals Telecom ApprovalsRegulatory Design Considerations Hardware ConsiderationsSafety 5V Tolerant Inputs for 3.3V Modules FCC Part 15 Regulation Industry CanadaFCC Part 68 Telecom Telecom Labeling RequirementsFrom FCC Part 68 Subpart D Conditions for Registration ReregistrationFax Branding Statement Canadian Limitations NoticeInternational Modem Restrictions EMC, Safety, and R&TTE Directive ComplianceIndustry Canada CS-03 Multiple ListingNew Zealand Telecom Warning Notice South African NoticeAppendix C Country Configuration Result Codes Country Country Config. hex ATI9 ResponseAppendix C Country Configuration and Result Codes Appendix C Country Configuration and Result Codes Appendix C Country Configuration and Result Codes Page Index Index Index Index
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