Speech Clarity C50
Calculate C50 as 10 log10 of early-to-late squared-impulse-response energy.
Description
Clarity C50 compares impulse-response energy arriving within the first 50 ms with later energy.
Clarity C50 compares impulse-response energy arriving within the first 50 ms with later energy. It uses a different cutoff from C80.1
The returned values include C50. The How section below explains the calculation, input rules and interpretation.
When to use Speech Clarity C50
Use Speech Clarity C50 when you need to evaluate the supplied records under the calculation and evidence rules below. Zero energies are rejected. No response integration, speech intelligibility score or universal target is supplied.
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 Speech Clarity C50 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 earlyEnergy0To50Milliseconds, lateEnergyAfter50Milliseconds using the field table and calculation rules, then run the tool.
- Read clarityC50Decibels. 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 |
|---|---|---|---|
| earlyEnergy0To50Milliseconds | Early energy through 50 ms | number; minimum: 0 | Required |
| lateEnergyAfter50Milliseconds | Late energy after 50 ms | number; minimum: 0 | Required |
Enter strictly positive finite early and late squared-response energies in matching units. Compute the log energy ratio with separate-logarithm fallback for overflowing or underflowing division. Return clarity in decibels.
C50=10log10(early0To50ms/lateAfter50ms) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| clarityC50Decibels | C50 (dB) | number |
{
"input": {
"earlyEnergy0To50Milliseconds": 100,
"lateEnergyAfter50Milliseconds": 10
},
"output": {
"clarityC50Decibels": 10
}
}Limitations and assumptions
Zero energies are rejected. No response integration, speech intelligibility score or universal target is supplied.
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
-
Speech Clarity C50 — 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.