Help with Microphone Chips specifications:
Microphone Function
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| Audio | Audio microphones are designed to detect sound and transmit signals for the purpose of voice communication, music, audio observation, etc. | ||
| Measurement | Measurement microphones are designed to detect sound, noise levels, and other characteristics, or for quantification and analysis. They are not necessarily meant for sound signal transmission to speakers. | ||
| 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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Microphone Specifications
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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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| 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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| Directivity | |||
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| 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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Features & Applications
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| Features | |||
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| RoHS Compliant | Restriction of Hazardous Substances (RoHS) is a European Union (EU) directive that requires all manufacturers of electronic and electrical equipment sold in Europe to demonstrate that their products contain only minimal levels of the following hazardous substances: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyl, and polybrominated diphenyl ether. RoHS became effective on July 1, 2006. | ||
| 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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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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