Enter the sennheiser rs 127 user manual you see below Sorry, we just need to make sure you’re not a robot. Enter the characters you see below Sorry, we just need to make sure you’re not a robot. Classifying microphones according to which physical quantity they exploit. Related articles on this site: Fourier Transform.
For their use in recording, see Audio. Now, most microphones are based on the variation with sound pressure of either an inductance or a capacitance. Alternative possibilities include piezoelectric microphones, which rely on the voltages generated by varying pressure in certain solids. Unlike all of the above, optical microphones can measure the variation of air pressure directly, without the help of any kind of moving membrane, but they’re not yet commonplace. Transforming one physical quantity into another is called transducing. To do this, various intermediary techniques can be employed. That way, sound modulates the frequency of the primary circuit, which is then demodulated to retrieve the signal.
I’m told that Sennheiser’s MKH series works this way, including the legendary MKH 416. Loudspeaker History by by Steven E. The first of those three terms is an irrelevant constant and the second term is dwarved by the third. Transversally, it’s virtually impossible for the ribbon to bend. Sensitivity is the ratio of voltage output to sound pressure input. When neither is too large, that’s a constant.
In engineering terms, it’s useful to think of it as the ratio of two time-derivatives. That much is clear at the outset when designing a microphone. Voltage is unrelated to static pressure. The discontinued predecessor of the aforementioned BP4071 was the AT4071a which had a nominal sensitivity of 89.
The discrepancy comes from the former use in acoustics of the units of pressure still preferred by many meteorologists. Not only does this avoid the aforementioned ambiguity of decibels, but it also serves as a constant reminder of what sensitivity is all about. Unit conversions is a known source of distress. NASA once crashed a spacecraft on Mars because of that. As I was looking for data relevant to this page, I came across a discussion between audio afficionados where the above 20 dB offset is mistaken for real substance.