Flutter Echo Frequency
Calculate the round-trip interval and repetition frequency between parallel surfaces under a caller-supplied sound speed.
Description
Parallel reflecting surfaces can produce a repeated round-trip reflection pattern.
Parallel reflecting surfaces can produce a repeated round-trip reflection pattern. An ideal travel-time estimate gives its repetition interval and corresponding frequency.1
The returned values include Repetition frequency, Round-trip interval. The How section below explains the calculation, input rules and interpretation.
When to use Flutter Echo Frequency
Use Flutter Echo Frequency when you need to evaluate the supplied records under the calculation and evidence rules below. No reflection strength, absorption, irregular geometry or flutter audibility is modeled.
Choose the measured quantities, units, weighting and measurement basis before entering values. For a reference, select the exact topic. For a catalog lookup, prepare complete source-backed records; for a screen, select an applicable caller limit.
How to use Flutter Echo Frequency and understand its results
- Choose the measured quantities, units, weighting and measurement basis before entering values. For a reference, select the exact topic. For a catalog lookup, prepare complete source-backed records; for a screen, select an applicable caller limit.
- Enter separationMeters, soundSpeedMetersPerSecond using the field table and calculation rules, then run the tool.
- Read repetitionFrequencyHertz, roundTripMilliseconds. 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 |
|---|---|---|---|
| separationMeters | Surface separation (m) | number; minimum: 0 | Required |
| soundSpeedMetersPerSecond | Sound speed (m/s) | number; minimum: 0 | Required |
Enter finite strictly positive surface spacing in meters and sound speed in meters per second. Calculate the round-trip quantities and require both outputs to be finite and positive.
frequency=c/(2d); intervalMilliseconds=2000d/c Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| repetitionFrequencyHertz | Repetition frequency (Hz) | number; minimum: 0 |
| roundTripMilliseconds | Round-trip interval (ms) | number; minimum: 0 |
{
"input": {
"separationMeters": 5,
"soundSpeedMetersPerSecond": 343
},
"output": {
"repetitionFrequencyHertz": 34.3,
"roundTripMilliseconds": 29.154518950437318
}
}Limitations and assumptions
No reflection strength, absorption, irregular geometry or flutter audibility is modeled.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing fields without a declared default, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Image-Source Method Reference: The image-source method mirrors a source across room boundaries so specular reflection paths can be represented as straight paths to virtual sources. This reference explains the selected concept and the evidence needed to interpret it. For a complementary task, use Music Clarity C80: Clarity C80 compares impulse-response energy arriving within the first 80 ms with later energy. A larger value indicates a stronger early-to-late balance on this definition.
References
-
Flutter Echo Frequency — tool.io
Similar or alternative tools
- Image-Source Method Reference
The image-source method mirrors a source across room boundaries so specular reflection paths can be represented as straight paths to virtual sources. This reference explains the selected concept and the evidence needed to interpret it.
- Music Clarity C80
Clarity C80 compares impulse-response energy arriving within the first 80 ms with later energy. A larger value indicates a stronger early-to-late balance on this definition.