Music Clarity C80
Calculate C80 as 10 log10 of early-to-late squared-impulse-response energy.
Description
Clarity C80 compares impulse-response energy arriving within the first 80 ms with later energy.
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.1
The returned values include C80. The How section below explains the calculation, input rules and interpretation.
When to use Music Clarity C80
Use Music Clarity C80 when you need to evaluate the supplied records under the calculation and evidence rules below. Zero early or late energy is an input error, not an infinite result. No response integration, frequency averaging or ideal concert-hall target is provided.
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 Music Clarity C80 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 earlyEnergy0To80Milliseconds, lateEnergyAfter80Milliseconds using the field table and calculation rules, then run the tool.
- Read clarityC80Decibels. 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 |
|---|---|---|---|
| earlyEnergy0To80Milliseconds | Early energy through 80 ms | number; minimum: 0 | Required |
| lateEnergyAfter80Milliseconds | Late energy after 80 ms | number; minimum: 0 | Required |
Enter strictly positive finite early and late squared-response energies in matching units. Compute the log energy ratio; if direct division overflows or underflows, subtract the separate logarithms instead. Return clarity in decibels.
C80=10log10(early0To80ms/lateAfter80ms) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| clarityC80Decibels | C80 (dB) | number |
{
"input": {
"earlyEnergy0To80Milliseconds": 100,
"lateEnergyAfter80Milliseconds": 25
},
"output": {
"clarityC80Decibels": 6.020599913279624
}
}Limitations and assumptions
Zero early or late energy is an input error, not an infinite result. No response integration, frequency averaging or ideal concert-hall target is provided.
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 Speech Clarity C50: Clarity C50 compares impulse-response energy arriving within the first 50 ms with later energy. It uses a different cutoff from C80. For a complementary task, use EDT and Late-Decay Reference: EDT is derived from the initial 0 to -10 dB decay slope and extrapolated to a 60 dB decay time; it emphasizes the early subjective decay. This reference explains the selected concept and the evidence needed to interpret it.
References
-
Music Clarity C80 — tool.io
Similar or alternative tools
- Speech Clarity C50
Clarity C50 compares impulse-response energy arriving within the first 50 ms with later energy. It uses a different cutoff from C80.
- EDT and Late-Decay Reference
EDT is derived from the initial 0 to -10 dB decay slope and extrapolated to a 60 dB decay time; it emphasizes the early subjective decay. This reference explains the selected concept and the evidence needed to interpret it.