Description
Map excerpt time into relative and source coordinates.
Cultural source records can encode exact tokens, voices, time offsets and context budgets. Their literal structure can be summarized without determining authorship, cultural meaning, source authority or adequacy of interpretation.
Map excerpt time into relative and source coordinates.
When to use this tool
Use Media Excerpt Citation Offset when checking a supplied source-context or annotation convention.
How to use the tool and how it works
- Enter excerptStart, excerptTime, sourceOrigin. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read sourceTime, relativeTime. Use the output convention below.
Map excerpt time into relative and source coordinates. relativeTime = excerptStart+excerptTime; sourceTime adds sourceOrigin.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| excerptStart | Excerpt Start | Required. Finite number. |
| excerptTime | Excerpt Time | Required. Finite number. |
| sourceOrigin | Source Origin | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| sourceTime | Source Time | Required. Finite number. |
| relativeTime | Relative Time | Required. Finite number. |
{
"input": {
"excerptStart": 30,
"excerptTime": 5,
"sourceOrigin": 100
},
"output": {
"sourceTime": 135,
"relativeTime": 35
}
}Limitations and assumptions
- All times share a unit and origin convention; no media is retrieved or citation target verified.
- 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 the actual sources and relevant participant or community context for substantive interpretation and attribution.
References
Similar or alternative tools
- Excerpt Context Window Offset
Return clipped context bounds around an excerpt.
- Public Corpus Source Share
Return one source's share of a unit-matched corpus.