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Guide by Purpose

Introduce numerous widgets included in MeasureLab, categorized by purpose.

🔍 Quick Search Guide

Checklist to find the best tool for "what you want to do" quickly.

What you want to do Recommended Widget
Output sound / Need a signal source Signal Generator
Synthesize complex waveforms / Blend specific harmonics Arbitrary Harmonic Generator
View frequency components (spectrum) Spectrum Analyzer
Check specific frequencies with extremely high resolution Lock-in Spectrum Finder
View original waveform shape Oscilloscope
Measure distortion (THD) of amps or components Distortion Analyzer
Apply feedforward distortion compensation to an audio signal Feedforward Compensator
Measure frequency response of amps, etc. Network Analyzer
Measure impedance of speakers Impedance Analyzer
Measure ultra-low distortion (THD) with high precision Lock-in Harmonic Analyzer
Manage loudness (LUFS) LUFS Meter
Know ambient noise level (SPL) Sound Level Meter
Analyze noise types (1/f, etc.) Noise Profiler
Precisely align L/R acoustic characteristics Stereo Alignment Monitor
Overlay and compare multiple plot traces from different measurements Plot Comparer
Evaluate digital/analog transmission path quality, latency, and integrity Transmission Analyzer (Experimental)

📡 Signal Generation

Tools for outputting signals or generating reference signals.

  • Signal Generator

    • Generates sine waves, noise, sweep signals, etc. It is the basic signal source for measurements.

  • Arbitrary Harmonic Generator

    • An advanced signal generator that allows synthesizing complex waveforms by precisely controlling the amplitude and phase of multiple harmonic components (up to the 50th order) relative to the fundamental frequency.

  • Timecode Monitor & Generator

    • Generates and monitors LTC (Linear Timecode). Used for checking synchronization with video equipment.

📊 Basic Analysis

Measures basic characteristics of audio signals (spectrum, level, frequency).

  • Spectrum Analyzer

    • Real-time display of frequency components (spectrum) using FFT.

  • Lock-in Spectrum Finder

    • Uses lock-in detection to analyze the spectrum of a specified frequency band with high resolution. Ideal for magnifying specific peaks buried in noise.

  • Sound Level Meter

    • A sound level meter. Measures sound pressure level (SPL) and equivalent continuous sound level (Leq).

  • LUFS Meter

    • Measures loudness units relative to full scale (LUFS). Suitable for level management for broadcasting and distribution.

  • Frequency Counter

    • Counts the frequency of input signals with high precision. Statistical analysis such as Allan deviation is also possible.

  • Spectrogram

    • Visualizes changes in frequency components over time with colors (voiceprint analysis, etc.).

📉 Distortion & Quality

Tools for evaluating equipment performance and sound quality.

  • Distortion Analyzer
    • Measures THD (Total Harmonic Distortion) or THD+N. Use this for basic distortion measurements.

  • Nonlinear Analyzer

    • An advanced distortion analysis tool that uses the Hammerstein model to separate and extract 1st (linear) to 5th order harmonic kernels from equipment responses.

  • Feedforward Compensator

    • Applies feedforward distortion compensation (LICFF) to audio signals using Hammerstein system models.

  • Nonlinear Response Analyzer

    • Identifies Wiener models to analyze dynamic nonlinear system behavior.

  • Linearity Analyzer

    • Measures input/output level linearity. Used for verifying the low-level signal reproduction capability and dynamic range of DACs.

  • Advanced Distortion Meter

    • Performs more advanced distortion analysis, such as multitone measurement and IMD (Intermodulation Distortion).

  • Lock-in Harmonic Analyzer

    • An ultra-low distortion (THD) measurement module utilizing the principle of a lock-in amplifier. It achieves high precision by performing multi-parallel IQ detection (up to 200th order) strictly tuned to the fundamental and harmonics.

  • Sound Quality Analyzer

    • Calculates psychoacoustic "sound quality" metrics such as sharpness and roughness.

  • Noise Profiler

    • Analyzes noise floor characteristics (1/f noise, white noise, etc.).

🔌 Circuit & Network

Measures transmission characteristics, impedance, etc., of electronic circuits and systems.

  • Network Analyzer

    • Measures frequency response (gain, phase, group delay). Useful for checking characteristics of amplifiers and filters. Supports RIAA curve overlay for phono-equalizer testing.

  • Impedance Analyzer

    • Measures impedance characteristics (LCR) of speakers and components.

  • Lock-in Amplifier

    • Detects infinitesimal signals buried in noise. Can also be used as an FRA (Frequency Response Analyzer).

  • Lock-in Frequency Counter

    • Tracks minute frequency deviations or phase fluctuations relative to a reference signal.

  • Loopback Finder

    • Detects loopback paths of audio interfaces.

  • Transmission Analyzer (Experimental)

    • An experimental module that utilizes PRBS sequences (pseudo-random noise) to comprehensively measure digital audio bit-integrity (bit-perfection and DSP detection) as well as analog path metrics like EVM, impulse response, propagation delay, and clock jitter.

📈 Time Domain

Observes waveform shapes and transient changes on the time axis.

  • Oscilloscope

    • A general-purpose oscilloscope. Observes the waveform itself.

  • Raw Time Series

    • A tool like a chart recorder that records waveforms over a long period and allows you to check them by scrolling.

  • Transient Analyzer

    • Triggers and analyzes transient phenomena such as impulse responses. Wavelet transform display is also possible.

  • Boxcar Averager

    • Averages repetitive signals to remove noise and extract minute waveforms.

🎧 Spatial & Acoustics

Handles stereo image and spatial sound reverberation.

  • Goniometer

    • Displays phase relationship (spread) of stereo signals using Lissajous figures, etc.

  • BNIM Meter

    • Binaural Neural Image Map. Visualizes sound source localization (ITD/ILD) based on auditory models.

  • HRTF Player

    • Loads Head-Related Transfer Functions (HRTF/SOFA) and simulates 3D audio playback via convolution.

  • Stereo Alignment Monitor

    • Monitors the consistency of L/R level, frequency response, and phase in real-time to verify stereo alignment.

  • Spatial Binaural Mixer

    • A high-quality offline multitrack spatial audio renderer. Load stems and independently position them in 3D space using HRTF, avoiding real-time processing artifacts.

🛠️ Utilities

Other useful functions.

  • Recorder & Player
    • Simple recording and playback function.
  • Waveform Loop Player
    • A tool that allows you to load an audio file, inspect its waveform, and loop a selected region. Useful for repeatedly observing transient responses.
  • Inverse Filter
    • Creates an inverse filter to cancel out the characteristics of speakers and rooms.
  • Detachable Wrapper
    • A framework for detaching any widget into a separate window.
  • Plot Comparer
    • Imports measurement traces saved/exported from other modules (Spectrum Analyzer, Network Analyzer, Oscilloscope, etc.) and allows detailed comparison by overlaying them with adjustable gain offsets, axis shifts, and peak alignment.
  • Processor Benchmark
    • Tests the FFT and rendering performance of your PC to verify real-time processing limits.
  • Settings
    • Configure audio device settings, language settings, theme changes, etc.
  • Log Viewer
    • Displays real-time application logs, warnings, and errors for diagnostics and troubleshooting.
  • Welcome
    • The startup screen.