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 - Samples

Controls: File Menu >> File Info >> Samples
Macro: FileInfo?S

This is the number of samples per channel in the file. For most files, this will be the number of sample periods or time points in the data set. For single-screen files this will usually be 1024 samples. DDisk files will be at least 1024 samples and usually much more.

Wave averages are always 1024 samples, even though each file sample is the Frames total of individual samples. (The data are displayed as averages by dividing each file sample by the total Frames.)

The exception is spectrum averages. These are always listed here as 512 samples, but each "sample" is really one spectral line. There are 512 spectral lines produced from 1024 original waveform time samples, and the spectral lines from successive averager frames are summed to produce the file values.


Macro Notes:

To set user variable X to the number of samples in an open 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), use X=FileInfo?S.


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

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