Description
Map a signed sample-index difference to time.
Cardiac recordings use sample indexes, time origins, event markers and observation windows. A sample-grid count, interval conversion or phase comparison operates on supplied records; it does not detect an actual heartbeat, validate an ECG or determine a clinical diagnosis.
Map a signed sample-index difference to time.
When to use this tool
Use ECG Sample To Time Factor when checking the stated cardiac-record indexing, timing, phase or coverage convention.
How to use the tool and how it works
- Enter sampleIndex, originSample, sampleRateHertz, suppliedTimeOrigin. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read timeSeconds, relativeSeconds. Use the output convention below.
Map a signed sample-index difference to time. Require sampleRateHertz > 0; subtract sampleIndex-originSample exactly with integer intermediates, divide by rate for relativeSeconds and add suppliedTimeOrigin.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| sampleIndex | Safe integer sample coordinate; subtraction is exact before conversion to floating time. | Required. Safe integer. |
| originSample | Origin Sample | Required. Safe integer. |
| sampleRateHertz | Sample Rate Hertz | Required. Finite number; strictly above 0. |
| suppliedTimeOrigin | Supplied Time Origin | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| timeSeconds | Time Seconds | Required. Finite number. |
| relativeSeconds | Relative Seconds | Required. Finite number. |
{
"input": {
"sampleIndex": 120,
"originSample": 100,
"sampleRateHertz": 20,
"suppliedTimeOrigin": 5
},
"output": {
"timeSeconds": 6,
"relativeSeconds": 1
}
}Limitations and assumptions
- Numeric output remains floating point; actual sampling uniformity, timestamps and ECG events are not 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
Inspect the actual recording, acquisition settings and event annotations; use validated analysis and qualified clinical interpretation for patient-related decisions.
References
Similar or alternative tools
- ECG Sample RR Interval Duration Factor
Return RR duration and reciprocal beat rate from two sample markers.
- ECG Qt RR Unit Consistency Term
Convert QT/RR quantities to seconds before taking a ratio.