Microphone Incidence Reference
Return free-field and random-incidence microphone response context.
Description
A free-field microphone is designed so its presence and diffraction are compensated for sound arriving from the specified frontal direction.
A free-field microphone is designed so its presence and diffraction are compensated for sound arriving from the specified frontal direction. This reference explains the selected concept and the evidence needed to interpret it.1
The returned values include Source, Statement, Topic. The How section below explains the calculation, input rules and interpretation.
When to use Microphone Incidence Reference
Use Microphone Incidence Reference when you need to evaluate the supplied records under the calculation and evidence rules below. Incidence correction depends on microphone model, angle, frequency, and field; use the manufacturer calibration data rather than a universal offset. This is an introductory excerpt, not the complete standard, a current compliance check or a project-specific calculation.
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 Microphone Incidence Reference 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 topic using the field table and calculation rules, then run the tool.
- Read source, statement, topic. 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 |
|---|---|---|---|
| topic | Reference topic to return. | string; one of "free-field", "random-incidence", "caution" | Required |
Choose one of the exact topic values in the table. The tool indexes a fixed, locally embedded reference entry and returns its source label, statement and unchanged topic. It does not fetch the source or update the wording. Topic meanings and all returned entries are shown below.
| Selection | Returned reference entry |
|---|---|
| free-field | source: IEC 61094 and measurement-microphone manufacturer guidance; statement: A free-field microphone is designed so its presence and diffraction are compensated for sound arriving from the specified frontal direction.; topic: free-field |
| random-incidence | source: IEC 61094 and measurement-microphone manufacturer guidance; statement: A random-incidence microphone is equalized for sound arriving from many directions, as in a diffuse field.; topic: random-incidence |
| caution | source: Microphone calibration documentation; statement: Incidence correction depends on microphone model, angle, frequency, and field; use the manufacturer calibration data rather than a universal offset.; topic: caution |
selected exact topic → embedded source label, explanatory statement and topic Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| source | Source used for the reference statement. | string |
| statement | Narrow reference statement for the selected topic. | string |
| topic | Selected reference topic. | string; one of "free-field", "random-incidence", "caution" |
{
"input": {
"topic": "free-field"
},
"output": {
"source": "IEC 61094 and measurement-microphone manufacturer guidance",
"statement": "A free-field microphone is designed so its presence and diffraction are compensated for sound arriving from the specified frontal direction.",
"topic": "free-field"
}
}Limitations and assumptions
Incidence correction depends on microphone model, angle, frequency, and field; use the manufacturer calibration data rather than a universal offset. This is an introductory excerpt, not the complete standard, a current compliance check or a project-specific calculation.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Extremely large text inputs are rejected. 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 Microphone Placement Reference: Microphone height and distance from façades or other reflecting surfaces must follow the stated measurement standard and assessment objective. This reference explains the selected concept and the evidence needed to interpret it. For a complementary task, use IEC 61672 Class Reference: IEC 61672 Class 1 instruments have tighter tolerance limits and a wider specified frequency range than Class 2 instruments. This reference explains the selected concept and the evidence needed to interpret it.
References
-
Microphone Incidence Reference — tool.io
Similar or alternative tools
- Microphone Placement Reference
Microphone height and distance from façades or other reflecting surfaces must follow the stated measurement standard and assessment objective. This reference explains the selected concept and the evidence needed to interpret it.
- IEC 61672 Class Reference
IEC 61672 Class 1 instruments have tighter tolerance limits and a wider specified frequency range than Class 2 instruments. This reference explains the selected concept and the evidence needed to interpret it.