Description
Divide nonnegative characters by positive durationSeconds for charactersPerSecond.
Caption timing compares text with a speech clock, while reading rate divides a supplied character count by display duration. Neither measurement alone establishes accessibility or comprehension.
Divide nonnegative characters by positive durationSeconds for charactersPerSecond.
When to use this tool
Use Caption Reading Rate Term when you need a caption lag or reading-rate term.
How to use the tool and how it works
- Enter characters, durationSeconds. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read charactersPerSecond. Use the output convention below.
Divide nonnegative characters by positive durationSeconds for charactersPerSecond.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| characters | Characters | Required. Safe integer; minimum 0. |
| durationSeconds | Duration Seconds | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| charactersPerSecond | Characters Per Second | Required. Finite number. |
{
"input": {
"characters": 42,
"durationSeconds": 3
},
"output": {
"charactersPerSecond": 14
}
}Limitations and assumptions
- The character-count convention is caller supplied; no language-specific readability threshold or accessibility verdict is applied.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Review captions in context using the applicable accessibility and language-specific quality criteria.
References
Similar or alternative tools
- Caption Lead Lag Scalar
Subtract suppliedCaptionClockOffset from captionOnset, then subtract speechOnset for lag.
- Broadcast Boundary Frame Rounding Gap
Multiply endSeconds - startSeconds by framesPerSecond, round its frame count using floor, ceil, or nearest, and divide back to seconds.