APU Software Loudness Contour v5.7.1

[OS9999]

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.

Software Overview

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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.
Key Features

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• 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.
  

Why Choose APU Loudness Contour

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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.
System Requirements

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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.
Home Page

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Product Information

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• 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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