Description
Supplied differential/common-mode gain rejection ratio using amplitude dB, without an EEG amplifier certification.
Neurophysiological research records use sample coordinates, event clocks, epoch boundaries, references, signal amplitudes, and spectral bins. Timing conversions and support shares depend on rate, origin, exclusion, and boundary policies. Arithmetic on supplied values is separate from signal detection, validated acquisition, or neurological interpretation.
Supplied differential/common-mode gain rejection ratio using amplitude dB, without an EEG amplifier certification.
When to use this tool
Use EEG Commonmode Rejection Signal Ratio when you need this research signal, sample, event, epoch, reference, or spectral component from supplied data.
How to use the tool and how it works
- Enter commonModeGain, differentialGain, commonModeAmplitude, differentialAmplitude. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read cmrrDb, residualCommonMode, differentialOutput. Use the output convention below.
Require nonzero differentialGain and commonModeGain. Return cmrrDb=20*log10(abs(differentialGain/commonModeGain)), residualCommonMode=commonModeGain*commonModeAmplitude, and differentialOutput=differentialGain*differentialAmplitude.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| commonModeGain | Common Mode Gain | Required. Finite number. |
| differentialGain | Differential Gain | Required. Finite number. |
| commonModeAmplitude | Common Mode Amplitude | Required. Finite number. |
| differentialAmplitude | Differential Amplitude | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| cmrrDb | Cmrr Db | Required. Finite number. |
| residualCommonMode | Residual Common Mode | Required. Finite number. |
| differentialOutput | Differential Output | Required. Finite number. |
{
"input": {
"commonModeGain": 0.01,
"differentialGain": 100,
"commonModeAmplitude": 1,
"differentialAmplitude": 0.001
},
"output": {
"cmrrDb": 80,
"residualCommonMode": 0.01,
"differentialOutput": 0.1
}
}Limitations and assumptions
- Gains share one ratio basis and amplitudes use compatible signal units. This is a supplied scalar amplifier model, not a measured rejection test, electrical-safety check, complete acquisition model, or clinical signal-quality conclusion.
- 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
Use calibrated acquisition and the intended signal-analysis protocol for a complete assessment. Verify sample rate, coordinate origin, clock offsets, reference configuration, filtering assumptions, and observation support.
References
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