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



Spectrum Analyzer

Signal Generator

(Absolutely FREE!)


Pitch Tracker


DaqMusiq Generator
(Free Music... Forever!)

Engine Simulator

LCR Meter

Remote Operation

DC Measurements

True RMS Voltmeter

Sound Level Meter

Frequency Counter
    Spectral Event

    MHz Frequencies

Data Logger

Waveform Averager


Post-Stimulus Time
Histogram (PSTH)

THD Meter

IMD Meter

Precision Phase Meter

Pulse Meter

Macro System

Multi-Trace Arrays

Trigger Controls


Spectral Peak Track

Spectrum Limit Testing

Direct-to-Disk Recording



Frequency response

Distortion measurement

Speech and music

Microphone calibration

Loudspeaker test

Auditory phenomena

Musical instrument tuning

Animal sound

Evoked potentials

Rotating machinery


Product test

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Multi-Channel Output Controls

Macro: GenMultiDlg

The Multi-Channel Outputs button is only enabled if both Left and Right output toggles are on. (The Generator itself does not need to be on.)

Important: Even if the button is enabled, it does not indicate whether true multi-channel capability is available. If you have a multi-channel sound card, you must specifically enable multi-channel operation before starting Daqarta.

The button opens the Multi-Channel Outputs control dialog, which allows you to toggle multi-channel output operation, select which output channels to use, and which streams to send to each.

You can also select any two of the active channels to be monitored as Left Out and Right Out, which means they will be processed and displayed as normal Left and Right waveforms, spectra, averages, or spectrograms, including in Decimate mode, and can be used as Trigger Sources.

Please note: You cannot record multi-channel outputs with DDisk at the present time, not even the selected monitor channels. If you use Save Trace as .DQA Data File (or .WAV, .DAT, or .TXT files), however, the current 1024-sample traces for the selected monitor channels will be saved.

The Show All Raw Chans button allows you to also see the waveforms or spectra of any other active output channels. A Spacing control allows you to spread them apart vertically for better viewing.

Note that Daqarta's own volume controls (F9 key), or the Windows volume controls (speaker icon in the system tray), only support stereo outputs unless you are using Windows XP (which uses Daqarta's multi-channel slider dialog). For Vista, 7, 8, and 10 you'll need to use the custom control panel that comes with your multi-channel card to control all channels.

Note that even if you don't have a multi-channel sound card, you can still use the Multi-Channel Outputs mode. Similarly, if you have a 4-channel or 6-channel card, you can still use 8-channel mode. In such cases, Windows will combine the selected channels to fit the actual channels available.

You can't tell which channels are being combined just by looking at Daqarta's output display; you will need to determine this via listening tests or by using a loopback cable to feed selected outputs back to the input channels for examination.

Please note that when this happens, it is possible to have output clipping even though the Generator Clip Indicator is not activated. This can arise when the Stream Levels are properly limited to 100% or less for the designated output channels, such that they wouldn't clip with a true multi-channel card, but the Windows-combined total exceeds 100%.

The Multi-Channel Test Setup can simplify the above tests, as well as providing an example for creating your own setups.

Macro Notes:

GenMultiDlg=1 opens the dialog, GenMultiDlg=0 closes it, and GenMultiDlg=x toggles between open and closed.

Note that you do not need to open this dialog to change its controls directly via macro command.

See also Signal Generator Control Dialog.


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