【 Weak current College 】 from sensitivity and frequency response to infer the microphone of the quality and performance

We can phone structure (dynamic or capacitor) and point to properties (cardioid, Omni-etc), to determine if a microphone is suitable for our requirements. However, we infer that a microphone quality and performance will not be so simple.
Recording quality and ultimately by the device in the lowest quality, a component of the decision that the recording quality is good, does not exceed the worst component of the quality. If you do not have pickup accurate high-quality microphone, you will not be able to make high-quality vocal or instrumental recorded. High quality microphone can help you get from the scene show the best results.
Evaluation of a microphone performance, sensitivity and frequency response are two very important aspects. Microphone sensitivity depends on — for sound pressure signal generation of signal level. — Like cases, the larger the better the signal. The larger the resulting signal signal level higher, microphone, the higher the SNR. In any of the energy conversion, there are some invalid energy transformed into noise. For the same sound signal, the receiver output signal level of effective, means that the smaller the relative noise.
On the microphone sensitivity, we often encounter — some people confused. If you want to only consider one of these, then, from the sound pressure level (SPL). Low impedance microphone's output signal level — like below input sound level, but are you really SPL tell how much lower. SPL is a negative number, such as DB-50dB (at the indicators-50dB ratio-60dB large).
We need to draw your attention to: point: not every manufacturer gives the SPL is relative to the same — input signal. Comparison of different manufacturers of receiver, you must ensure that they all use the same reference signals, you must pass the cumbersome for mathematical calculation to be under the same conditions as a result of the comparison. Reference signal is usually listed in the SPL, as-74dB (OdB = 1V/mb, 1kHz).
Frequencyresponse is the microphone from low to high frequency sound of the different "hearing" a sense of competence. Visitors can feel the sound frequency of maximum range is 20Hz-20kHz. Therefore, the ideal microphone should also be able to voice within 20Hz-20kHz response. On the actual handset frequency response of a reasonable expectation is 50Hz-15kHz. In a musical instrument pickup, you'd better be able to use a frequency range and is on these frequencies have a very good response of the receiver. For example, the most general piano bass about 27Hz, brilliance about 4.2kHz, people singing voice frequency range of about 100Hz-1.2kHz. You can see, the pickup for piano and singing pickup microphone, frequency response is not required — sort of: singing pickup microphone does not require a response below 100Hz voice, for piano pickup microphone you must have a wide range of responses. Cymbals (cymbals) pitch range 7.5kHz-10kHz, cymbals of pickup the handset needs to have good high-frequency response characteristics.
For a microphone, the sound can cover useful throughout the frequency range is important: it is equally important, it must also be able to on the wide range of frequency response of the sound evenly. Subject to limitations of the physical structure, microphone to respond to various frequencies within the range of sounds for uniform response is very difficult, therefore, in the frequency response curve on the high response of the Peak District and the Valley area, lower xiangyin, ideal frequency response curve should be like the desktop —-like flat, it curves on both ends of the limit response point suddenly straight down.
But why many vocalists and recording are fond of using the range in response to the peak of microphone 1kHz-5kHz? this is because the frequency response curve in the range of the microphone to increase clarity of song and luminance. Therefore, not all of the frequency response curve is more even better. As for the painter, and there is no absolute ideal of a red. Similarly, there is no ideal microphone, its frequency response is applicable for any occasion. Sometimes, flat response curve is definitely what you need, but in other cases, the response curve has a projection but is better. Of course, these should not be the factory manufacturing defects caused by when the microphone.