EXPANDED DYNAMIC RANGE MICROPHONES AND MICROPHONE ASSEMBLIES APPLICATION NOTE
●The majority of Knowles Electronics microphones have evolved in concert with hearing aid technology over many years. Many of the attributes of the microphones (small size, high signal/noise, etc.) also help enable commercial applications. Some common attributes, may not be compatible with certain applications. For instance, it is typically desirable for hearing aids to function on a 0.9V supply. For compatibility, many Knowles microphones are designed with a nominal signal bias voltage of 0.45V to maximize signal dynamic range in a hearing aid.
●The 0.45V signal bias also constrains the maximum dynamic range for the microphone at about 0.9Vpp signal voltage, which corresponds to a maximum sound pressure for linear signal output.
●To expand the sound pressure allowed for linear operation, a number of microphones are available that allow for signal bias at ½ of the supply voltage to allow full utilization. For the current set of available microphones, the maximum supply voltage allowable is 10VDC, so the available signal is approximately 10Vpp.
●A customized microphone element with external circuitry is required for center-bias capability.
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EK-26899-P03 、 EK-26899-P58 、 EK-31144-P58 、 WP-30113-P03 、 FG45-32259-P03 、 FG45-32335-P03 、 FG45-32335-000 、 FG45-32491-000 、 VFG-34048-000 、 VFG-34049-000 、 VEK-H-30108-000 、 VWP-H-30109-000 、 VEK-H-30320-000 、 VEK-F-30470-000 |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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03-24-23 |
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Revision: A |
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HHAN-027 |
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2 MB |
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