Audio Loudness Meter 5.1
Audio Loudness and True Peak Meter VST, AU, AAX plugin
and standalone application, BS1770, EBU R128, ATSC and ARIB compliant
ALM51_V2
Brand new features.
ALM51Scales
ALM51Standards
Loudness Metering EBU ATSC and ARIB scales
ALM 5.1 calculates the values for the most important descriptors specified by the standards (Integrated Loudness – Program Loudness, Momentary Loudness, Short Time Loudness, Loudness Range). You can also choose the scale for Momentary Loudness according to your needs.
There are two options that can be accessed in the Settings window:
The standard: EBU with reference level at -23 LUFS, ATSC and ARIB with reference level at -24 LUFS.
The scale: +9 LU for a good resolution in the reference level zone, and +18 LU for a bigger dynamic range.
Relative Scales for all standards
You can also use relative scales, with the reference level of 0 LU. In this case the scale is the same for all the standards.
ALM51RelativeScales
Histogram
ALM 5.1 offers you a histogram with two possible views: one for the distribution of Momentary Loudness values and another for the distribution of Short Term Loudness values. You can switch between them using the toggle button below the graph. Also you have a color representation according with the chosen threshold values. The values above the threshold will be colored red and the ones below will be blue.
ALM51Histogram3
ALM51Histogram1
ALM51Histogram2
True Peak Metering
  • the Channel order you are using:
  •            ITU – L,R,C,LFE,Ls,Rs
               C|24 – L,C,R,Ls,Rs,LFE
               DTS – L,R,Ls,Rs,C,LFE
  • the reference level -18 dBTP or -20 dBTP
  • the the Peak Holding Time
  • the Overload Hold
Note that ALM 5.1 uses always the ITU configuration for the True Peak Metering representation: L,R,C,LFE,Ls,Rs. If you have a different channel order, you can choose the one you want to use.
ALM51TruePeak
Statistics
ALM 5.1 offers full statistics and real time values for all the main loudness descriptors of your program:
  • Program Loudness
  • Loudness Range
  • Max. Short Term Loudness with TC position for the maximum value
  • Max. Momentary Loudness with TC position for the maximum value
  • Max. True Peak with TC position for the maximum value
ALM51SaveReport
ALM51Statistics
Presets and color coding
ALM51Color-Coding
For a better monitoring of the Integrated Loudness, ALM 5.1 uses a color code. This way, you will know how your program loudness fares compared to the accepted tolerance of each standard. The accepted tolerance zone is the range of loudness that is comfortable to the listener. Note that the Integrated Loudness may not be constant through the program. It can vary within a specific zone according to the content requirements.
The color of Integrated Loudness parameter is:
green- if the Integrated Loudness matches the standard’s specifications;
yellow- if it’s around the standard’s specification, but still you must turn the volume up/down;
red- if the material is annoyingly loud/soft.
If you choose to use the presets, the default threshold for the Short Term Loudness will be the one specified by each standard. You can select another value according to your own needs. The color of Short Therm Loudness descriptor is in accordance with the threshold from the Settings window. If the measured value is above the threshold, the SL is green and if it is beyond the threshold, the SL is red.
Short Term and Momentary Loudness
ALM 5.1 offers full statistics and Using the real time visual representation of Momentary and Short Term Loudness through host automation lane and the number of hits over threshold from the statistics page, you can easily detect and correct the points with loudness problems.
ALM51NrofHits
ALM51HostRepresentation
Plugin Features
  • Audio Loudness and True Peak Metering VST, AU and AAX plugins;
  • Channel Formats: mono, stereo and 5.1;
  • Full compliance with loudness standards : BS-1770 (rev.3), EBU R128, ATSC A/85 and ARIB; presets and color coding are also available;
  • ITU, Avid C|24 and DTS 5.1 channel configuration;
  • Full loudness measurements using universal descriptors: Integrated Loudness/Program Loudness, Momentary Loudness, Short Time Loudness and Loudness Range;
  • Correct measurements for all the usual sample rates: 44.1 kHz, 48 kHz and multiples;
  • Real-time metering for Momentary Loudness, Short Term Loudness and Loudness Range;
  • Histogram for Momentary Loudness and Short Term Loudness;
  • Custom thresholds for Momentary Loudness and Short Term Loudness;
  • Real time visual representation of Momentary and Short Term Loudness through host automation lane;
  • True Peak Level Metering with peak hold;
  • Max True Peak Level (calculated using inter-sample peaks that can be missed in quantization);
  • Full statistics for Program Loudness, LRA, Max SL, Max ML, Max True Peak with timecode position for maximum values;
  • Overload counter for Momentary Loudness and Short Term Loudness;
  • Save loudness report option;
  • Low CPU usage due to the software optimization.
Loudness Descriptors
  • Integrated Loudness (Program Loudness) – describes the long-term integrated loudness of an audio material from ‘start’ to ‘stop’;
  • Momentary Loudness – calculated with a time window of 400 ms;
  • Short Term Loudness – calculated with a time window of 3 s;
  • Loudness Range – loudness dynamic range from ‘start’ to ‘stop’ that helps you decide if dynamic compression is necessary;
  • Max True Peak Level – indicates the maximum value of the signal waveform in the continuous time domain (this value is calculated using inter-sample peaks that can be missed in quantization).
Settings
  • Metering Standards: EBU, ATSC and ARIB specifications ;
  • Loudness Scales : +9 LU and +18 LU;
  • Loudness Units : LUFS and LU;
  • The Channel order you are using: ITU – L,R,C,LFE,Ls,Rs / C|24 – L,C,R,Ls,Rs,LFE / DTS – L,R,Ls,Rs,C,LFE
  • Integrated Loudness gating off : the gate (set at 10 LU below the absolute-gated loudness level) will not used. The Integrated Loudness and Loudness Range values are calculated for the entire audio material;
  • Follow transport : the measurements are done only if the audio material is in ‘play’ mode;
  • True Peak ref. level : -18 dBTP and -20 dBTP;
  • True Peak max. level : from -5 dBTP to -1 dBTP. Sets the maximum value of the signal waveform calculated using inter-sample peaks that can be missed in quantization. Above that value the peak led indicators are red (the level is the same for all the channels);
  • Peak hold : from 0 s to 10 s. Represents the period of time the Peak holders are on;
  • Overload hold : from 0 s to 10 s. Represents the period of time the Peak Led indicators are on.
ALM51Settings
Audio Settings – standalone version
The ALM 5.1 standalone version offers complex I/O Audio Settings and routing capabilities. This way you can take advantage of the same features even if your system doesn’t support VST, AU or AAX plugins. You can choose:
  • Input and output audio interface
  • Sample Rate
  • Audio buffer size
  • The inputs and the outputs for L, R, C, LFE, LS, RS
ALM51AudioSettings
Minimum System Requirements
MAC
Dual Core CPU with SSE2 support
2GB RAM
OSX10.6
PC
Dual Core CPU (Intel or AMD) with SSE2 support
2GB RAM
Windows 7
Available Formats
MAC
VST 2.4 universal binary
AU universal binary
AAX universal binary
Standalone
PC
VST 2.4 universal binary
AU universal binary
AAX universal binary
Standalone
Try before you buy
You can download a free trial, without feature limitations.