Duple/Triple/Quadruple Meter Classifier
Classify duple/triple/quadruple actual pulse grouping separately from beat subdivision, retaining unequal/additive groups; numerator alone does not identify perceived pulse.
Description
Pulse count and beat subdivision answer different meter questions.
Pulse count and beat subdivision answer different meter questions. Unequal groups can form an additive meter under the same signature.1
Enter integer numerator 1–32, denominator from 1,2,4,8,16,32,64 and 1–32 integer pulse groups 1–16 summing to numerator. Return class/count and whether any group differs from the first.
When to use Duple/Triple/Quadruple Meter Classifier
Use Duple/Triple/Quadruple Meter Classifier when you need to evaluate the supplied records under the calculation and evidence rules below. Actual pulse grouping is supplied rather than inferred from the numerator or audio.
Enter the written notes, explicit grouping, pitch observations or supported chord tokens requested. Keep scientific octaves, accidentals and caller evidence consistent.
How to use Duple/Triple/Quadruple Meter Classifier and understand its results
- Enter the written notes, explicit grouping, pitch observations or supported chord tokens requested. Keep scientific octaves, accidentals and caller evidence consistent.
- Enter signatureNumerator, signatureDenominator, declaredPulseGroups using the field table and calculation rules, then run the tool.
- Read pulseGroupingClass, pulseCount, additiveUnequalPulseGroups. 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 |
|---|---|---|---|
| signatureNumerator | Signature numerator | number | Required |
| signatureDenominator | Signature denominator | number | Required |
| declaredPulseGroups | Declared pulse groups | list of number | Required |
Enter integer numerator 1–32, denominator from 1,2,4,8,16,32,64 and 1–32 integer pulse groups 1–16 summing to numerator. Return class/count and whether any group differs from the first.
class depends on group count:1single,2duple,3triple,4quadruple,else higher-count Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| pulseGroupingClass | Pulse grouping class | string |
| pulseCount | Pulse count | number |
| additiveUnequalPulseGroups | Additive unequal pulse groups | boolean |
{
"input": {
"signatureNumerator": 12,
"signatureDenominator": 8,
"declaredPulseGroups": [
3,
3,
3,
3
]
},
"output": {
"pulseGroupingClass": "quadruple",
"pulseCount": 4,
"additiveUnequalPulseGroups": false
}
}Limitations and assumptions
Actual pulse grouping is supplied rather than inferred from the numerator or audio.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.
Alternative or Complementary methods
Use Simple/Compound Time Signature Classifier: Meter subdivision describes the units within each declared beat. The signature numerator alone does not establish the grouping. For a complementary task, use Swing Ratio Percentage Classifier: Swing timing compares durations within a two-event pair. A straight-timing tolerance makes near-equality explicit.
References
-
Duple/Triple/Quadruple Meter Classifier — tool.io
Similar or alternative tools
- Simple/Compound Time Signature Classifier
Meter subdivision describes the units within each declared beat. The signature numerator alone does not establish the grouping.
- Swing Ratio Percentage Classifier
Swing timing compares durations within a two-event pair. A straight-timing tolerance makes near-equality explicit.