Daqarta
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:

Features:

Oscilloscope

Spectrum Analyzer

8-Channel
Signal Generator

(Absolutely FREE!)

Spectrogram

Pitch Tracker

Pitch-to-MIDI

DaqMusiq Generator
(Free Music... Forever!)

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

Evoked potentials

Rotating machinery

Automotive

Product test

Contact us about
your application!

File Info - Channels

Controls: File Menu >> File Info >> Chans
Macros: FileInfo?C, FileInfo?M

This shows the channels used by the current open data file or the most-recently loaded Arb or Play file. Daqarta can open files with up to 4 channels: Left and Right Input plus Left and Right Output. These would simply be listed as 'LI, RI, LO, RO'.

Only Daqarta's own .DQA format can keep track of individual channel assignments. If you open a .WAV or .DAT data file, Daqarta will assume that a mono file is Left Input, and a stereo file is Left and Right Inputs.

If you open a mono or stereo file for Arb or Play use with the Daqarta Generator, the channels will be shown here as Left and Right Outputs.

When recording inputs or generating outputs, Daqarta allows you to control or account for the polarity of each channel using the Full-Scale Range and External Gain dialogs. If you save a file using the .DQA format, this polarity information is preserved and used when you later open the file. If a channel is to be shown inverted relative to the actual stored data polarity, its channel abbreviation is here preceded with a '-' sign, as in '-LI'.

Standard .WAV files have no place to store polarity information, so they will never be shown inverted here.

For .DAT files, Daqarta allows you to specify polarity via the Invert option in the .DAT File Format Dialog. Unlike .DQA files, however, any inversion is always applied the same to all channels, and shown as such here.


Macro Notes:

Use N=FileInfo?C to set user variable N to the number of channels (1, 2, or 4) in a sampled-data file (one opened with the DD/Open toolbar button or the Open macro, for example, not an Arb or Play file loaded into the Daqarta Generator).

FileInfo?M returns the channel mapping. Standard .WAV and .DAT files are assumed to be inputs if 1 or 2 channels, so the mapping is only likely to be of interest in the case of .DQA files, which may hold input or output (Generator) data, or both. The mapping is encoded in 4 binary bits:

    0001    Left In
    0010    Right In
    0100    Left Out
    1000    Right Out

See also File Menu, Open Existing Data File, File Info Dialog

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