B&K 4071 user manual Dtmf Generation Mode, Dtmf generation # Duration 200 mS Delay Level -10.0 dBm

Page 32

5.16 DTMF Generation Mode

Introduction

Dual Tone Multi Frequency generation mode generates the Touch-tone dialing tones according ANSI T1.401-1988 Section 7.2 standard. The user can specify dialing digits “0” to “9” alone with ext ra DTMF codes “A” thru “D”.

A start delay can be specified for each digit. The duration of each digit can also be specified. These two parameters make it possible to test the performance DTMF detection systems. By sending a string of digits to dial to the RS-232 port, the 4071 can be used as a speed dialer; these digits are queued and dialed with the specified duration and delay between digits.

NOTE: The 4071 can generate a single DTMF digit on a repetitive basis by switching to Dualtone Generation mode and setting each Dualtone frequency to that of the desired DTMF digit. The ON and OFF times can then be set to repetitively generate the digit for the desired duration and repetition rate. Refer to the chapter on Dualtone Generation mode for more information.

Background

A DTMF dialing tone consists of two sinusoids of different frequencies, which are added together to form the output waveform. These frequencies were chosen so that they are not harmonically related. The table below lists each dialing digit and its associated Dualtone frequencies:

DTMF 0: 941 Hz and 1336 Hz

DTMF 1: 697 Hz and 1209 Hz

DTMF 2: 697 Hz and 1336 Hz

DTMF 3: 697 Hz and 1477 Hz

DTMF 4: 770 Hz and 1209 Hz

DTMF 5: 770 Hz and 1336 Hz

DTMF 6: 770 Hz and 1477 Hz

DTMF 7: 852 Hz and 1209 Hz

DTMF 8: 852 Hz and 1336 Hz

DTMF 9: 852 Hz and 1477 Hz

DTMF ∗: 941 Hz and 1209 Hz

DTMF #: 941 Hz and 1477 Hz

DTMF A: 697 Hz and 1633 Hz

DTMF B: 770 Hz and 1633 Hz

DTMF C: 852 Hz and 1633 Hz

DTMF D: 941 Hz and 1633 Hz

DTMF Generation Mode Parameters

The DTMF Generation mode has the following front panel display:

			DTMF generation: #		Duration: 200 mS
1
1
3			Delay:	0 mS	Level: -10.0 dBm
3			Delay:	0 mS	Level: -10.0 dBm

Figure 5.16-1: DTMF Generation mode display

1. Generated DTMF Digit

2

4

The last DTMF digit that was generated is displayed in this field. To generate a DTMF digit, the cursor must be either in this field or the OFF position. If the cursor is in any other field (i.e. Delay or Duration fields) then the keypad functions to enter those parameters.

27

BK Precision 4071 User Manual Rev.2.2

Image 32

Contents User’s Manual Page Model User’s Manual +K Precision CorpTable of Contents Warranty information Remote operationArbitrary waveform system DC Operation OptionIntroduction Description Feature summary ModesSIG Out connector Installation and setupSync out connector External Modulation In connector External Trigger/Gating/FSK/BPSK input External Reference Input / Ext Arb. Clock connector External Arb Sync In / Out connectorRS232 Interface connector Line in connectorMode key Operating controls and keysField arrow keys Recall / Store keyÉ, ê, è, ç keys Trigger keyNumeric keys 0 to 9, MHz/dBm, KHz/Vp-p/Sec, Hz/mVp-p/mS keys One Touch Mode KeysClear key Operating mode selection Operating guideChanging frequency Changing levelEntering a new value Changing valuesModifying an existing value Sinewave Mode 000,000.00 Hz 10.0 dBm Mode descriptionsBasic Sinewave CW Mode Internal AM Mode External AM Mode External AM Mode ParametersExternal AM Input gain 000,000.00 Hz PEP level -10.0 dBm Input GainInternal FM Mode Internal FM Mode ParametersInt FM 1,000 Hz Pk dev 10,000 Hz 000,000.00 Hz 10.0 dBm Peak Frequency DeviationExternal FM Pk dev 10,000 Hz 000,000.00 Hz 10.0 dBm External FM ModeExternal FM Mode Parameters Internal PM Mode Internal PM Mode ParametersPeak Phase Deviation Int PM 1,000 Hz Pk dev 180 deg 000,000.00 Hz 10.0 dBmExternal PM Pk dev 180 deg 000,000.00 Hz 10.0 dBm External PM ModeExternal PM Mode Parameters Sweep Mode Up / Down sweep Sweep timeInternal FSK Mode Internal FSK Mode ParametersMark Frequency Space FrequencyExternal FSK Mode External FSK Mode ParametersExt FSK Mark 1,000,000.00 Hz Space 2,000,000.00 Hz 10.0 dBm Ext FSK InputBurst frequency Burst Mode IntroductionBurst Mode Trig Ton 10,000 mS 000,000.00 Hz Off 10.0 dBm Internal SSB Mode Internal SSB Mode ParametersInt SSB 1,000 Hz Upper Sideband 000,000.00 Hz 10.0 dBm Upper/Lower Sideband selectionsExternal SSB Upper Sideband 000,000.00 Hz 10.0 dBm External SSB ModeExternal SSB Mode Parameters Dtmf Generation Mode Dtmf generation # Duration 200 mS Delay Level -10.0 dBmDtmf Generation Mode Parameters BackgroundDtmf Delay Dtmf DurationDtmf Detection Mode Dtmf Detection Mode ParametersDtmf detection on Ext Mod input 3 # a Dtmf detected digitsPower & Voltage Measurement Mode Power & Voltage Measurement Mode ParametersPower Level Voltage LevelOther mode Arbitrary ModeRemote Mode Int Bpsk 1,000 Hz 000,000.00 Hz 10.0 dBm Internal Bpsk ModeInternal Bpsk Mode Parameters External Bpsk 000,000.00 Hz 10.0 dBm External Bpsk ModeExternal Bpsk Mode Parameters Dualtone Generation Mode 10,000 Hz F2 Ton 000 mS Toff 10.0Dualtone Examples Data Modulation Mode Using the Data Modulation ModeData Modulation Mode Parameters Baud RateDownloading Modulation Message Data Example MessageTriggering the Transmission Saving the MessageVoltage Controlled Oscillator VCO Mode VCO Mode ParametersStart End 1,000,000.00 Hz 10.0 dBm End FrequencyChecking your connection with Hyper Terminal ConnectingRemote Operation Remote Control Operation Remote Control Programming RulesRemote Control Commands Reset 4071 to Sine wave mode× Ø Returns CReport hardware and software versions K1.0 Enable, Disable front panel keys and rotary knobE1,0 Enable, Disable LCD echo to terminal Stp 31,500,000.00 Hz Linear Trig Up Time 10,000 mSF0-9 Move cursor to field 0 to ? or H Print help menuRemote Control Examples ExamplePin 9-pin cable Pin 25 pin cable adapter Arbitrary Waveform ModeQuick Start Guide Introduction to the Arbitrary Waveform System Description of the Arbitrary Waveform GeneratorSwitching Modes Feature SummaryFunction Generator Pulse GeneratorArbitrary Waveform Mode Int Clock / Ext Clock / Lock Master Lock slave modePhase Continuous/Triggered modeFunction Generator Mode Function Gen Wave Pos Ramp Rep Freq 100,000 Hz 000 mVWaveform Repetition FrequencyDuty Cycle Pulse Generator ModePositive Only Using WAVELOAD.EXE Downloading arbitrary waveformsSaving Arbitrary Waveforms Cwaveload /COMx /y /baudz filename.extUsing your own program Rules for Floating Point format Data FormatsFloating Point Format Time & Value Floating Point Format Example #2Digital Format Integer Format Rules for Integer formatExample The data value E468 is handled as follows Hexadecimal FormatRules for Hexadecimal format Example Binary FormatRules for Binary format Generator Multiple Units LockingArb More on Phase Offsets Phase ResolutionStarting Address = Number of waveform points * Phase Offset Waveform Size RestrictionsExample Arb Program Program Listing ARB.BASClose System Subroutines Return Print #1, a Send integer value to Return Return Wiring Diagram DC Operation Option4071 Specifications Operating ModesSoftware CD RemoteHardware Setup Appendix aCLS CLS Print Print Subroutines END SUB Television Remote Control Example Appendix BCLS Make sure a 4071 is attached to the serial port Print Limited Two-Year Warranty Service Information Savi Ranch Pkwy Yorba Linda, CA 92887 USA TEL