Sound head: the type of device used, condenser microphones are currently the most common.
Frequency response: indicates the acceptable frequency range. This parameter alone is not enough. This range only indicates that the sensitivity is within an acceptable range in the 30Hz-20kHz frequency band, but this range does not have a recognized value, so a better description is Frequency response curve.
However, for human voices, the frequency response requirements are actually very low, and a too wide frequency response will record some unwanted environmental noise.
Sensitivity: The output value of 1kHz unit sound pressure input, generally -30dB to -50dB, in fact, this value itself is not very meaningful, because the microphone will be converted by amplifier and AD.
Directivity: Cardioid directivity refers to the highest sensitivity to the front and the lowest to the back.
It is suitable for recording to a certain target, if it is used for a conference call, multiple microphones are required.
Output impedance: Affect the matching problem of back-end equipment.
Load impedance: The impedance of the back-end device cannot be less than this value, otherwise the output will drop.
Equivalent noise level: The output noise of the microphone itself when there is no sound input is a very important parameter. The microphone's "clearly recorded sound" depends on the difference between the recorded sound and the noise, and it is also described by the signal-to-noise ratio (SNR) With this feature, SNR=94-Noise.
That is, the microphone signal-to-noise ratio is 76dBA. Maximum sound pressure: The maximum sound that can be accepted. If it exceeds this value, the total harmonic distortion (THD) will increase sharply. This is also a very important parameter.