LOUDCHECK AUDIO READINESS FRAMEWORK
How LoudCheck works.
LoudCheck combines standardized audio measurement, technical interpretation, distribution modelling and evidence-based risk assessment to determine whether an audio file is technically ready for its intended use.
IMPORTANT DISTINCTION
LoudCheck separates measurement from interpretation. Objective measurements are obtained from the audio signal first. LoudCheck then applies documented interpretation, risk and readiness rules to those measurements.
References to ITU, AES, EBU, broadcast, streaming or other industry practices describe technical foundations or reference frameworks. They do not mean that LoudCheck is certified, endorsed or approved by those organizations.
01 • FOUNDATION
The foundation of LoudCheck
LoudCheck originally developed from professional audio measurement and loudness concepts described in established audio engineering literature. The methodology has since evolved into a versioned technical framework that can incorporate current measurement standards, distribution guidance, engineering research and observed technical risks.
Audio engineering foundation
LoudCheck retains the fundamental principles of professional audio measurement, loudness management, dynamic control, peak management and signal integrity that formed the original conceptual foundation.
Current measurement standards
Where applicable, LoudCheck aligns its measurement implementation with current published technical recommendations and practices rather than treating historical thresholds as permanent rules.
Distribution context
A measurement is not automatically a problem. LoudCheck interprets measurements in the context of the selected distribution profile and expected playback consequences.
Proprietary assessment
The LoudCheck risk engine, readiness logic, classification system and recommendation engine are LoudCheck methodology components.
02 • FRAMEWORK
The LoudCheck Audio Readiness Framework
LoudCheck is structured as a sequence of measurable, explainable stages. Each stage produces evidence used by the following stage.
Audio validation
LoudCheck first validates that the submitted audio can be decoded and analyzed reliably.
Standardized measurement
The measurement engine calculates objective audio characteristics including loudness, true peak and dynamic measurements.
Signal analysis
Additional analysis evaluates clipping, stereo characteristics, spectral distribution and other measurable signal properties.
Distribution modelling
Measurements can be evaluated against the selected distribution context rather than against one universal loudness target.
Risk assessment
LoudCheck determines whether measured characteristics create identifiable technical risks.
Evidence-based decision
The final readiness state is derived from documented evidence rather than from a single loudness number.
03 • MEASUREMENT ENGINE
Objective audio measurement
LoudCheck separates objective measurements from the interpretation applied to them. Measurement values describe the signal; the assessment engine determines what those values may mean in context.
Integrated Loudness
Integrated programme loudness describes the overall loudness of the analyzed programme. LoudCheck uses a BS.1770-based loudness measurement approach and reports the result in LUFS.
Short-Term Loudness
Short-term loudness provides a view of loudness behaviour over shorter programme intervals. It helps identify significant loudness changes that can be hidden by an integrated measurement.
Momentary Loudness
Momentary loudness describes rapid changes in programme loudness and can be used to identify unusually high or low short-duration loudness events.
True Peak
LoudCheck evaluates reconstructed waveform peaks rather than relying solely on the largest stored PCM sample. True peak is reported in dBTP.
Sample Peak
Sample peak records the maximum magnitude of the stored digital samples. LoudCheck keeps sample peak distinct from reconstructed true peak so that the two measurements are not incorrectly treated as the same quantity.
Loudness Range
LRA is treated as a descriptive measurement of loudness variation. LoudCheck does not automatically classify a larger or smaller LRA as technically good or bad.
Peak-to-Loudness Ratio
LoudCheck calculates PLR as the difference between true peak and integrated loudness.
PLR is interpreted as a dynamic/headroom indicator, not as an automatic quality score.
RMS Level
RMS provides an additional signal-level measurement. It is retained as a supporting measurement rather than being treated as a replacement for loudness measurement.
Crest / Dynamic Indicators
Where implemented, crest-related measurements provide additional information about the relationship between peaks and average signal energy.
Stereo Characteristics
LoudCheck evaluates channel balance and other measurable stereo characteristics to identify significant asymmetry or potential playback concerns.
Spectral Characteristics
LoudCheck analyzes relative spectral energy across defined frequency regions. Spectral measurements describe energy distribution and do not independently determine whether a mix is tonally correct.
Clipping and Overload Indicators
LoudCheck distinguishes stored sample clipping from reconstructed true-peak conditions. These measurements are treated as separate forms of signal evidence.
04 • TECHNICAL BASIS
Measurement standards and references
LoudCheck uses published technical standards and recommendations as reference points for measurement and distribution analysis. The standards are not converted into a claim that LoudCheck itself is a certified standards compliance instrument.
| Reference | Role in LoudCheck | Position |
|---|---|---|
| ITU-R BS.1770 | Programme loudness and true-peak measurement foundation. | Measurement reference |
| AES loudness guidance | Distribution-loudness and streaming context reference. | Distribution reference |
| EBU / broadcast practices | Relevant where a broadcast-oriented distribution profile is selected. | Profile-specific reference |
| LoudCheck rules | Risk classification, readiness decisions and recommendations. | Proprietary methodology |
IMPORTANT
Standards evolve. LoudCheck therefore records methodology versions and does not treat any historical recommendation as permanent or universal.
05 • DISTRIBUTION
Distribution profiles
LoudCheck does not assume that one loudness target is appropriate for every form of audio distribution. The selected distribution profile determines which measurements and risks receive priority.
Streaming Music
Evaluates loudness, normalization behaviour, true peak, dynamic characteristics and potential encoding-related peak risk for music distributed through Internet services.
Broadcast
Applies broadcast-oriented loudness and peak considerations where the selected delivery environment requires them.
Speech / Podcast
Places greater emphasis on programme loudness, short-term behaviour, peak control and speech-oriented consistency.
Video / Online Media
Evaluates the audio according to the requirements of the selected video or online distribution context.
06 • SIMULATION
Normalization and distribution modelling
LoudCheck may model a simplified normalization scenario using a selected distribution reference. The purpose is to estimate the consequences of a playback gain adjustment, not to reproduce a proprietary streaming service.
LoudCheck can then estimate the resulting peak position after the modelled gain adjustment.
SIMULATION LIMITATION
Actual services may use different normalization settings, playback modes, codecs, gain management, metadata, limiting behaviour and device processing. Therefore LoudCheck's simulation represents an analytical model and not a guarantee of exactly what a particular service, application, device or codec will do.
07 • RISK ENGINE
Risk domains
LoudCheck evaluates technical findings through independent risk domains rather than reducing the entire audio file to one universal quality number.
| Risk Domain | Primary Evidence | Purpose |
|---|---|---|
| Loudness | Integrated, short-term and momentary loudness. | Identify loudness position and significant loudness behaviour. |
| Peak | True peak and sample peak. | Identify peak and reconstruction-related risk. |
| Dynamics | PLR, LRA and supporting dynamic measurements. | Describe dynamic behaviour and potential over-control. |
| Signal Integrity | Clipping and overload indicators. | Identify measurable signal integrity problems. |
| Stereo | Channel balance and stereo characteristics. | Identify significant channel or spatial imbalance. |
| Spectrum | Frequency-region energy distribution. | Identify unusual spectral characteristics requiring review. |
| Distribution | Normalization model and selected distribution profile. | Estimate potential consequences of delivery processing. |
A risk flag is not automatically a statement that the audio is technically unacceptable. It indicates that a measured characteristic deserves review within the selected context.
08 • SEVERITY
Risk severity
LoudCheck classifies findings according to their potential technical consequence.
LOW
Informational
A measurable characteristic is present but is unlikely to represent a significant technical problem by itself.
MODERATE
Review recommended
The characteristic may create a meaningful distribution, playback or production concern depending on context.
HIGH
Significant technical risk
The measured evidence indicates a substantial technical risk under the selected LoudCheck methodology and profile.
09 • CLASSIFICATION
Content classification
LoudCheck may use deterministic signal characteristics to classify material into broad analytical categories. These classifications help contextualize risk rules and recommendations. They are not genre labels and are not presented as an official AES or industry taxonomy.
| Classification | Purpose | Interpretation |
|---|---|---|
| Wide Dynamic Range | Identify material exhibiting substantial loudness variation. | Descriptive classification, not a quality judgement. |
| Speech Dominant | Identify material with characteristics consistent with speech-heavy content. | Used to improve contextual interpretation. |
| Dense Music | Identify highly controlled or continuously energetic music. | Used to contextualize dynamic and loudness indicators. |
| Mixed | Material that does not strongly satisfy another heuristic. | Neutral fallback classification. |
Classification thresholds may change between methodology versions as LoudCheck's measurement and validation process develops.
10 • DECISION ENGINE
Release readiness
Readiness is the final interpretation of the measured evidence and identified technical risks. It is not a judgement of artistic quality.
READY
No significant technical risk
No configured high-severity issue was detected and the audio satisfies the current readiness requirements for the selected profile.
CONDITIONALLY READY
Review recommended
One or more moderate or contextual risks were detected. The audio may still be suitable for release, but the identified findings should be reviewed.
NOT READY
Significant release risk
The evidence contains a configured combination of high-severity technical risks requiring correction or professional review before release.
DECISION PRINCIPLE
LoudCheck therefore does not treat a single measurement, such as LUFS, as a universal pass/fail criterion.
11 • CRITICAL CHECKS
Current LoudCheck critical checks
The following represent examples of the types of findings that may materially affect readiness. Exact thresholds belong to the active assessment-rule version and may change independently from the measurement engine.
Excessive true peak may indicate elevated risk of reconstruction or encoding-related overload.
Simulated distribution processing may identify a potential peak consequence after normalization.
Very low dynamic indicators may trigger a review of excessive dynamic control, particularly in dense material.
Significant stereo imbalance may trigger a channel-balance review.
Unusual spectral distribution may trigger a tonal or translation review.
Multiple independent risks may combine to produce a higher overall readiness risk.
12 • TRACEABILITY
Evidence chain
Every significant LoudCheck finding should be traceable from the final recommendation back to the measurement that caused it.
EXAMPLE
Measurement: True Peak = +0.42 dBTP
Context: Streaming Music distribution profile
Risk: Potential peak / encoding risk
Severity: High
Recommendation: Review limiter ceiling and peak management.
13 • ANALYSIS CONFIDENCE
Technical confidence
LoudCheck distinguishes confidence in the analysis from the readiness of the audio. A confidence score should describe the reliability and completeness of the analytical process, not whether the music is "good."
Measurement integrity
Confidence that the audio was decoded and measured without material processing or corruption affecting the analysis.
Analysis completeness
Confidence that the required measurements for the selected profile were successfully calculated.
Profile applicability
Confidence that the selected distribution profile is appropriate for the analysis context.
Signal quality
Confidence based on detectable signal conditions that may affect interpretation.
IMPORTANT
Technical confidence must never be interpreted as a percentage of audio quality, artistic quality or probability of commercial success.
14 • GUIDANCE
Recommendation engine
Recommendations are generated from measured evidence and identified risks. They should explain what should be reviewed and why.
Review peak management when true peak indicates elevated reconstruction or encoding risk.
Review dynamic processing when multiple indicators suggest potential over-control.
Review normalization consequences when a distribution profile predicts substantial gain adjustment.
Review clipping and gain staging when signal integrity indicators identify overload.
Review stereo balance when channel measurements indicate significant asymmetry.
Review spectral characteristics when energy distribution falls outside the configured analytical review ranges.
PROFESSIONAL REVIEW
LoudCheck is an analytical decision-support system. Recommendations do not replace the judgement of a qualified mixing or mastering engineer. Musical intent, genre, arrangement, production decisions, artistic objectives and listening context remain important.
15 • TECHNICAL POSITIONING
What "AES-aligned" means
LoudCheck uses professional audio concepts and published technical guidance as part of its methodological foundation.
AES-ALIGNED ≠ AES-CERTIFIED
LoudCheck must not be represented as AES-certified, AES-approved or an official AES compliance test unless such certification or approval has been explicitly granted by the Audio Engineering Society.
CURRENT POSITION
LoudCheck uses standards and recommendations as technical references while maintaining a separate proprietary interpretation and decision layer. The methodology is designed to evolve as relevant measurement standards, distribution practices and technical knowledge evolve.
16 • LIMITATIONS
What LoudCheck cannot determine
LoudCheck cannot determine whether a master sounds artistically better or worse.
LoudCheck cannot determine artistic intent.
LoudCheck cannot guarantee acceptance by a distributor, streaming service or other platform.
LoudCheck does not reproduce every proprietary playback, normalization, codec or device-processing algorithm.
Spectral measurements do not independently determine whether a mix is tonally correct.
A high or low LRA value is not automatically evidence of a technically incorrect master.
A single loudness target should not be interpreted as a universal requirement for all audio distribution.
Readiness is an assessment under the active LoudCheck methodology and may change as that methodology evolves.
17 • REPRODUCIBILITY
Reproducibility and auditability
LoudCheck is designed so that a result can be traced back to the measurements, methodology version, distribution profile and assessment rules that produced it.
ANALYSIS RECORD
measurement_engine = LC-ME 2.0
assessment_engine = LC-AE 2.0
distribution_profile = selected profile
analysis_timestamp = recorded at analysis
18 • VERSIONING
Methodology versioning
LoudCheck separates major methodological components so that changes can be documented and reproduced.
| Component | Example Version | Changes Covered |
|---|---|---|
| Methodology | LC Methodology 2.0 | Overall framework and technical philosophy. |
| Measurement Engine | LC-ME 2.0 | Measurement algorithms and signal-processing procedures. |
| Assessment Engine | LC-AE 2.0 | Risk thresholds, severity rules and readiness decisions. |
| Distribution Profiles | LC-DP 2.0 | Distribution-specific reference values and simulation logic. |
A material risk-rule change → Assessment Engine version change
A material distribution-model change → Distribution Profile version change
19 • EVOLUTION
How the methodology evolves
LoudCheck is designed as a living methodology rather than a fixed collection of permanent thresholds.
Standards review
Relevant technical standards and recommendations are reviewed when methodology revisions are considered.
Measurement validation
Measurement implementation can be tested against known signals, reference material and expected results.
Rule evaluation
Risk rules are evaluated to determine whether thresholds are useful, explainable and contextually appropriate.
Version release
Material changes are assigned a methodology version so previous analyses remain traceable.
20 • SOURCE OF TRUTH
LoudCheck as an analytical source of truth
LoudCheck does not attempt to become the authority on subjective audio quality. Instead, its objective is to become a reliable source of traceable technical evidence about measurable properties of an audio file.
LOUDCHECK PRINCIPLE
If LoudCheck reports a technical finding, the user should be able to trace that finding back to a measurable property, a documented rule and the methodology version that produced it.
21 • PROFESSIONAL JUDGEMENT
Engineering judgement remains important
LoudCheck is not designed to remove the role of the recording, mixing or mastering engineer. Its purpose is to provide a consistent analytical layer that helps professionals identify measurable conditions before making a final release decision.
Measurement
What does the audio measure?
Interpretation
What might those measurements mean?
Judgement
What should the engineer ultimately do?
22 • FINAL STATEMENT
Transparent by design.
LoudCheck is designed to provide transparent, repeatable and technically explainable audio analysis. Its methodology separates objective measurement from interpretation, risk assessment and recommendation.
LoudCheck does not attempt to replace professional engineering judgement. Its purpose is to provide a consistent analytical layer that helps creators, producers, engineers and studios understand measurable audio characteristics and potential distribution risks.
LoudCheck Audio Readiness Framework v2.0