Daqarta
Data AcQuisition And Real-Time Analysis
Scope - Spectrum - Spectrogram - Signal Generator
Software for Windows
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The following is from the Daqarta Help system:

Features:

Oscilloscope

Spectrum Analyzer

8-Channel
Signal Generator

(Absolutely FREE!)

Spectrogram

Pitch Tracker

Pitch-to-MIDI

DaqMusiq Generator
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Engine Simulator

LCR Meter

Remote Operation

DC Measurements

True RMS Voltmeter

Sound Level Meter

Frequency Counter
    Period
    Event
    Spectral Event

    Temperature
    Pressure
    MHz Frequencies

Data Logger

Waveform Averager

Histogram

Post-Stimulus Time
Histogram (PSTH)

THD Meter

IMD Meter

Precision Phase Meter

Pulse Meter

Macro System

Multi-Trace Arrays

Trigger Controls

Auto-Calibration

Spectral Peak Track

Spectrum Limit Testing

Direct-to-Disk Recording

Accessibility

Applications:

Frequency response

Distortion measurement

Speech and music

Microphone calibration

Loudspeaker test

Auditory phenomena

Musical instrument tuning

Animal sound

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Rotating machinery

Automotive

Product test

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Timing Modulation Source


Macros: ModSrc, TmModSrc

This button opens a standard Modulation Source dialog. It allows you to select Sine (default) or any lower-numbered stream or combination of streams for Stream Modulation.

The number in parentheses next to each Stream option is its overall stream number. This is a single digit (0-6) that can be used to toggle it via hot-key instead of a mouse click. To select Sine, toggle all Streams off.

On Left Stream 0, Sine is the only option. On Stream 1, you also have the option of selecting Stream 0 as the source. Higher-numbered streams allow all lower-numbered streams, plus all combinations. The Right channel streams are all numbered higher than the Left, so any Right stream can use any and all Left streams.

When more than one stream is selected as the source for a particular modulator, the selected streams are summed together to get the overall modulation. In this case, you should insure that the total of the respective stream Levels does not exceed 100%.

Note that each Quant, Bias, or Shift modulator may have a different modulation source, but there is only one Sine source for each Stream. It is shared among the three dialogs, such that setting its frequency or phase in one dialog will change the corresponding value in the others. The Depth settings are independent. If you need a different Sine for each modulator, consider Stream Modulation.

When using Stream Modulation with Multi-Channel Outputs, unlike normal stereo, the modulator stream itself can be used as an output. This can be used to supply a modulation sync signal to an external device.


Macro Notes:

Use Quant., Bias., or Shift. prefixes in addition to channel and stream prefixes to specify the modulator for the ModSrc command. The value you supply is a bit map of the streams to be used, where each bit in the value specifies a specific stream. The bit numbers are the same as the overall stream numbers (0-6) shown in parentheses next to each stream in the dialog, as mentioned above.

You can use binary, hexadecimal, or decimal notation. You can specify more than one stream by setting the appropriate bits.

    Sine (default)     b00000000   h00    0
    L.0 Stream  (0)    b00000001   h01    1
    L.1 Stream  (1)    b00000010   h02    2
    L.2 Stream  (2)    b00000100   h04    4
    L.3 Stream  (3)    b00001000   h08    8
    R.0 Stream  (4)    b00010000   h10   16
    R.1 Stream  (5)    b00100000   h20   32
    R.2 Stream  (6)    b01000000   h40   64

For example, L.3.Quant.ModSrc=1 will set Left Stream 3 Quant modulation to use the output of Left Stream 0 (bit 1) as the modulation source. L.3.Quant.ModSrc=b11 will set it to use the sum of Left Stream 0 and Left Stream 1, since 3 is the sum of bit 0 (=1) and bit 1 (=2).

Note that the chosen modulator must be available for the given stream, or else the macro will set Sine. Sine is always available, but only streams lower than the current stream may be used as modulators.

If a Timing Modulator dialog is open, TmModSrc=1 opens its Modulation Source dialog, TmModSrc=0 closes it, and TmModSrc=x toggles between open and closed. Note, however, that you do not need to open the Modulation Source dialog to set its controls directly, as above.


See also Timing Modulation, Random / Step Timing Dialog, Waveform Stream Controls.

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