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 - Decimate X

Controls: File Menu >> File Info >> Decimate X

If the opened file is a native Daqarta .DQA type, this Decimate X Info value shows the Decimate Factor that was in use if Decimate was active when the file was recorded, and it is a single-screen type (ie, saved with Save Trace as .DQA Data File in the File Menu) rather than an arbitrary-length DDisk file. Otherwise, the value defaults to 1 (normal file). In either case, the Decimate controls are disabled in the X-Axis Dialog... you can't change decimation after the fact.

Alternatively, if the opened file is a DDisk .DQA type that was recorded with Decimate active, Decimate X will show the Decimate Factor. If the file was recorded with Decimate Lock set, the Decimate controls will also be disabled, since the decimated data was recorded and can't be changed after the fact.

Otherwise, without Decimate Lock, Decimate X will show the Decimate Factor value in parentheses. This indicates that the DDisk file was recorded at the full Sample Rate by default. The original Decimate Factor will be applied to the opened file, so it looks the way it did when recorded, but you can go to the X-Axis Dialog and change the current factor at any time. When you return to File Info, that new value will then be shown in parentheses as Decimate X. You can even toggle Decimate off, or change the Decimate mode to or from Envelope, Demodulate, or Signed after the recording. (Note, however, that if the original recording was made with Decimate active, it will be Decimate Factor times larger than one made with Decimate Lock.)

Similarly, you can apply Decimate after-the-fact to a DDisk file that was recorded without it.


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

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