Free Download APU Software Loudness Contour v5.7.1 | 57.9 MB
APU Loudness Contour is a real-time equal-loudness filtering plug-in designed to provide detailed control over perceptual loudness contours. It supports several established contour standards and weighting systems, including ISO 226 (2003 & 2023), Fletcher-Munson, K-weighting, A/C-weighting, ECMA-418, and ITU-R 468.
Each supported contour is normalized to 0 dB at 1 kHz and provides an adjustable contour weight control. This allows the frequency response to be scaled in either direction, from a flat response at 0% weight to an inverted contour with negative weighting.

[h2]Software Overview[/h2]APU Loudness Contour provides real-time equal-loudness filtering with selectable perceptual contour models and adjustable reference levels. ISO 226 and Fletcher-Munson curves support reference levels from 20 dB SPL to 120 dB SPL, with smooth interpolation between the available phon curves.
The plug-in supports both linear-phase and minimum-phase filtering. Makeup gain compensation is available for each contour and reference level, with calibration based on pink-noise LUFS measurements. Additional output gain can be used for further manual level adjustment.
An integrated real-time spectrum analyzer provides detailed frequency visualization with configurable analysis parameters. Users can select different FFT sizes, window types, bucket widths, and time-averaging settings, while frequency display can be switched between linear, logarithmic, or musical-note scales.
[h2]Key Features[/h2]
  • Apply real-time equal-loudness filtering.
  • Support ISO 226 (2003 & 2023) loudness contours.
  • Support Fletcher-Munson contours.
  • Provide K-weighting and A/C-weighting options.
  • Support ECMA-418 and ITU-R 468 contours.
  • Normalize contours to 0 dB at 1 kHz.
  • Adjust contour weight in positive or negative directions.
  • Use 0% weight for a flat frequency response.
  • Invert the contour response using negative weighting.
  • Adjust ISO 226 and Fletcher-Munson reference levels from 20 dB SPL to 120 dB SPL.
  • Interpolate smoothly between phon curves.
  • Choose between linear-phase and minimum-phase filters.
  • Apply contour-specific makeup gain compensation.
  • Calibrate makeup gain using pink-noise LUFS measurements.
  • Adjust additional output gain for manual level control.
  • Analyze audio with the integrated real-time spectrum analyzer.
  • Configure FFT size, window type, bucket width, and time averaging.
  • Display frequency information using linear, logarithmic, or musical-note scales.
  • Use automatic zoom and custom dB range settings for spectrum visualization.
[h2]Why Choose APU Loudness Contour[/h2]APU Loudness Contour is suited to audio engineers, producers, and other users who need to examine or shape frequency response according to established equal-loudness models. Its range of contour standards and adjustable weighting controls provides detailed control over perceptual loudness filtering.
The combination of selectable filter types, reference-level control, calibrated makeup gain, and real-time spectral analysis provides a flexible environment for monitoring and processing frequency-dependent loudness characteristics.
[h2]System Requirements[/h2]APU Loudness Contour requires a compatible system capable of running the APU Software plug-in. Specific operating system, processor, memory, and hardware requirements were not provided in the source information.
[h2]Home Page[/h2]
קוד:
https://apu.software/contour/
[h2]Product Information[/h2]
  • Software Name: APU Software Loudness Contour
  • Version: v5.7.1
  • Languages: English
  • License type: Full Version
  • File Size: 57.9 MB


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