Early Lateral Energy Fraction
Calculate the early lateral-energy fraction from caller-supplied 5–80 ms lateral and 0–80 ms omnidirectional energies.
Description
Lateral energy fraction compares side-arriving energy in an early interval with total early energy.
Lateral energy fraction compares side-arriving energy in an early interval with total early energy. It requires squared-response energy quantities rather than sound-pressure amplitudes.1
The returned values include Early lateral fraction. The How section below explains the calculation, input rules and interpretation.
When to use Early Lateral Energy Fraction
Use Early Lateral Energy Fraction when you need to evaluate the supplied records under the calculation and evidence rules below. No impulse-response processing, microphone directivity correction or listening-quality threshold is calculated.
Choose the measured quantities, units, weighting and measurement basis before entering values. For a reference, select the exact topic. For a catalog lookup, prepare complete source-backed records; for a screen, select an applicable caller limit.
How to use Early Lateral Energy Fraction and understand its results
- Choose the measured quantities, units, weighting and measurement basis before entering values. For a reference, select the exact topic. For a catalog lookup, prepare complete source-backed records; for a screen, select an applicable caller limit.
- Enter lateralEnergy5To80Milliseconds, omnidirectionalEnergy0To80Milliseconds using the field table and calculation rules, then run the tool.
- Read lateralFraction. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| lateralEnergy5To80Milliseconds | Lateral energy from 5 to 80 ms | number; minimum: 0 | Required |
| omnidirectionalEnergy0To80Milliseconds | Omnidirectional energy from 0 to 80 ms | number; minimum: 0 | Required |
Enter finite nonnegative lateral 5–80 ms energy and finite positive omnidirectional 0–80 ms energy. Require lateral energy no greater than total energy. Return the dimensionless fraction from zero through one.
LF=lateralEnergy5To80ms/omnidirectionalEnergy0To80ms Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| lateralFraction | Early lateral fraction | number; minimum: 0; maximum: 1 |
{
"input": {
"lateralEnergy5To80Milliseconds": 25,
"omnidirectionalEnergy0To80Milliseconds": 100
},
"output": {
"lateralFraction": 0.25
}
}Limitations and assumptions
No impulse-response processing, microphone directivity correction or listening-quality threshold is calculated.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing fields without a declared default, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Music Clarity C80: Clarity C80 compares impulse-response energy arriving within the first 80 ms with later energy. A larger value indicates a stronger early-to-late balance on this definition. For a complementary task, use Auralization Process Reference: Auralization commonly convolves an anechoic source signal with a measured or simulated room impulse response. This reference explains the selected concept and the evidence needed to interpret it.
References
-
Early Lateral Energy Fraction — tool.io
Similar or alternative tools
- Music Clarity C80
Clarity C80 compares impulse-response energy arriving within the first 80 ms with later energy. A larger value indicates a stronger early-to-late balance on this definition.
- Auralization Process Reference
Auralization commonly convolves an anechoic source signal with a measured or simulated room impulse response. This reference explains the selected concept and the evidence needed to interpret it.