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!

SPL Response Decay

Controls: Options >> Sound Level Meter >> Decay
Macro: SPL_TCdecay

This controls the Decay time of the Sound Level Meter response. Values are in integer milliseconds only, so to enter, say, 1 second you would enter 1000.

The Decay time works with Attack as a "quasi-peak" detector. Decay controls how rapidly the meter reading dies down after a drop in sound level. Long Decay values make the meter easier to read when the input signal is rapidly changing.

If you set Decay to zero, Daqarta assumes you do not want quasi-peak operation. In this case, Attack sets a single time constant configured to provide an overall averaged response.

Decay has no effect if Attack is set to zero. In that case, the meter responds immediately to all changes, with no time constants.


Macro Notes:

SPL_TCdecay=1000 sets Attack to 1000 msec (1 second). SPL_TCdecay=>1 increments the current value and SPL_TCdecay=>-1 decrements it by 1 msec.


See also Sound Level Meter

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