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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DAT Bits (8, 12 Low, 12 High, 16)

Controls: DD/Open >> DAT Format >> Bits
Macro: DATbits=8, 12Lo, 12Hi, 16

Use these radio buttons to tell Daqarta the size of each data sample. 12-bit samples are always assumed to occupy 16-bit data words, so there are separate buttons to specify whether the data is justified to the low or high end of the word. Multi-channel 12-bit laboratory-type data acquisition boards often insert the channel number in the otherwise-unused 4 bits.

If you don't know the actual number of bits used by the file, you will have to guess. Note that 12-bit High and 16-bit will give very similar results at high signal levels; at low levels the 12-bit data will appear more quantized since it has 4 bits less resolution. You should probably try setting 16-bit first, since if it is really 12-bit the worst that usually happens is that the low 4 bits hold some constant non-zero value like a channel number. This simply adds a tiny vertical shift to the data.

Macro Notes:

DATbits can be set either with the numeric index of the radio button, or with the mnemonic for the button label:

    0 = 8
    1 = 12Lo
    2 = 12Hi
    3 = 16

The index method allows variables or expressions to compute, store, or recall any setting.

See also File Menu, Open Existing Data File, .DAT File Format Dialog


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