Help with Audio Microphones specifications:
Microphone Specifications
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| Directivity | |||
| Your choices are... | |||
| Omnidirectional | Microphone sensitivity is equal or nearly equal in all directions. | ||
| Directional | Microphone sensitivity is strongest in a particular direction or directions. Below are several types of directional sensitivity patterns. | ||
| Bidirectional | Microphone is strongly sensitive in two directions, typically opposite each other. | ||
| Semi cardioid | Moderately directional microphone, with a maximum direction of sensitivity, and whose minimum direction is typically opposite, or 180° from, the maximum. | ||
| Cardioid | Unidirectional microphone with an effective sensitivity angle of approximately 130°, or fairly well focused. Best rejection is directly opposite the direction of maximum sensitivity. So named because of the resemblance of the directivity graph to a traditional depiction of the human heart. | ||
| Supercardioid | Microphone with a narrower sensitivity angle, or pickup, than a cardioid microphone, typically 115°. Also has some sensitivity opposite the maximum pickup direction. | ||
| Hypercardioid | Tighter pickup angle than a supercardioid (105°), but with more rear pickup. | ||
| Other | Other unlisted, combination, or specialized microphone directivity pattern. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Frequency Response | Frequency response is the range of frequencies for which the microphone maintains a constant sensitivity within defined boundaries. Variation from this "linear" or "flat" sensitivity is given in dB; bounds that the define the linear frequency response will be in the form of ±3dB, -1dB/+4dB, etc. | ||
| Search Logic: | User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria. | ||
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| Dynamic Range | Dynamic range is the range of sound pressure levels (dB) for which the microphone will meet its performance specifications; it is limited on the low end by the inherent noise of the acoustic system and on the high end by the maximum sound pressure level. The standard unit for measuring sound pressure level (SPL) is the deciBel (dB) with a reference pressure of 20 micro Pascals (20 μPa), which is the human hearing threshold. | ||
| Search Logic: | User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria. | ||
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| Microphone Sensitivity: | Measure of how responsive or "hot" a microphone is. Sensitivity may be given in millivolt output per Pascal of sound pressure, or may be specified in dBV (dB), in which case it is typically a negative number. A correctly specified signal should exceed the inherent noise of the system yet not overload the preamplifier. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Signal to Noise Ratio | Logarithmic ratio of the signal level produced by a standard pressure signal (e.g., 94 dB SPL) to the noise floor. S/N Ratio is typically expressed in dBV, or often dB for short. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Impedance | Impedance is the resistance to flow of alternating current. Low impedance microphones exhibit values such as 100-500 ohms, whereas high impedance microphones can be 10,000 ohms or more. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Piezoelectric Technology | Piezoelectric Devices make use of the Piezoelectric Effect to perform an electronic or mechanical. The piezoelectric effect is found on some crystals, which acquire a charge when compressed, twisted or distorted. This provides a convenient transducer effect between electrical and mechanical oscillations. Several types of devices are available: actuators, sensors, motors, transducers, etc. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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Microphone Dimensions
Values are typically nominal.
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| Nominal Diameter | Different diameter microphones have differing dynamic characteristics. In general, larger diaphragms are more sensitive and have narrower frequency response; individual microphone specifications may vary. Microphone diameter is usually a nominal measurement. The most common choices are listed but may not be exact. A 1/2" microphone may actually be 13.2mm, for example, and a 25.2mm diameter microphone would be listed as 1". | ||
| Your choices are... | |||
| 1/8" | |||
| 1/4" | |||
| 1/2" | |||
| 1" | |||
| Other | Other unlisted microphone size. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Actual Diameter / Size | True diameter or width measurement. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Thickness / Height | Thickness or height of microphone; for assemblies or long probe microphones, this value represents the length. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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Features & Applications
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| Features | |||
| Your choices are... | |||
| Digital Microphone | Microphone with integral analog-to-digital converter to render sound into computer-recognized format. Possible applications include voice recognition, recording onto a digital voice recorder, etc. | ||
| Wireless Microphone | Microphone contains radio transmitter or other wireless capability. | ||
| Integral Pre-amplifier | Boosts the microphone output from a small to intermediate level. | ||
| Probe Style | Long tip for measuring near-field levels or hard to reach areas. | ||
| Array Type | Style to measure 3-D sound field around a test object. | ||
| Outdoor Rated | Designed for use outdoors and in weather. | ||
| Wind Screen | Diffuser, often foam, which minimizes wind noise. | ||
| Turbulence Screen | Screen which minimizes noise from turbulence in pipes, ducts, etc. | ||
| Sound Intensity Probe | Sound intensity is measured by an instrument with closely matched microphone pairs. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Polarization | Measurement condenser microphones may have a prepolarized electret back-plate or utilize external capacitor polarization. External polarization requires a separate power supply. | ||
| Your choices are... | |||
| Externally Polarized | Requires an external power source for excitation voltage or diaphragm capacitor charging. | ||
| Prepolarized Electret | Condenser microphone with back-plate coated with charged material; capacitor requires no external charging. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Operating / Polarization Voltage | Voltage at which the microphone will operate. Voltage may be externally supplied or generated by a polarized electret. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Application | |||
| Your choices are... | |||
| Active Noise Cancellation | Active noise cancellation is the identification of noise frequencies and the production of a canceling sound signal 180° out of phase with the noise or sound to be quieted. | ||
| Aerospace / Aircraft | Designed for use in aircraft. | ||
| Automotive | Microphones for radio or audio systems in cars, trucks, and other vehicles. | ||
| Broadcast / Studio | Professional grade audio microphone components and/or systems for use in recording studios or television and radio broadcast facilities and equipment. | ||
| Computer / Workstation | Designed for use with computers or industrial workstations. | ||
| Consumer Electronics / Gaming | Any consumer electronics application, including video games, television speakers, consumer-grade radios, toys, etc. | ||
| Headset / Helmet | Designed for installation in headsets, helmets, hands free sets, etc. | ||
| Loudspeaker / Public Address | Designed and constructed for use in public address systems or installation in public facilities. | ||
| Music / Audio Systems | Suitable for use in the reproduction of high fidelity audio and music sound. | ||
| Security / Paging | Designed for use in applications such as intercom systems, security access stations, and/or intraoffice paging or communications. | ||
| Telephone / Voice Communication | Designed for use with telephones and other voice communication products. | ||
| Other | Other unlisted, specialized, or proprietary application. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Environment
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| Operating Humidity Range: | Rated humidity range for microphone operation. | ||
| Search Logic: | User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria. | ||
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| Operating Temperature Range: | Rated temperature range for microphone operation. | ||
| Search Logic: | User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria. | ||
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