Cikgu Hijau: SPL KPM – Sistem Pengurusan

This article provides an overview regarding five important proceedings that are typically listed in microphone specification sheets: frequency greeting, allergic reaction, impedance, self noise level, and signal to noise ratio. Understanding these specs can promote uphill subsequent to bothersome to push nearly the best microphone to make a get of for a specific application splkpm.

Frequency Response

Frequency appreciation events how a microphone reacts to unconventional hermetically sealed frequencies. An ideal "flat" recognition (equal aversion) microphone would recognition equally to every one of frequencies within the audible spectrum. This results in a more accurate reproduction of hermetically sealed and produces the purest audio. The unchangeable is that even microphones which are advertised as having a "flat right of entry" can deviate somewhat at resolved frequencies. Typically spec sheets will list frequency tribute as a range gone "20Hz to 20kHz", meaning that the microphone can reproduce sounds that drop within that range. What this does not add footnotes to is how adeptly the various individual frequencies will be reproduced. Some microphones are purposely meant to resolved differently to determined frequencies. For example, instrument microphones for bass drums are generally engineered to be more supple to degrade frequencies even if vocal microphones would be more supple to the frequency of a human voice.

As a general deem of thumb, condenser microphones have elevate frequency responses than energetic. This means that a condenser would tend to be the augmented other if correctness of audio reproduction is the main wish.


Microphone sensitivity procedures how much electrical output (measured in "millivolts" mV) is generated for a resolution hermetically sealed pressure input. Typically once measuring microphone allergic reaction the mic is placed in a suggestion hermetic pitch where a hermetic pressure level (SPL) of 94 dB (1 Pascal) at 1000 Hz is maintained at the microphone. (Some vendors as soon as Shure use 74 dB 0.1 Pascal). The distinction is that 94 dB SPL is the typical sealed severity of someone speaking twelve inches away even though 74dB SPL would concur speaker one inch away. A typical condenser microphone might have a value listed either once "7mV/Pa" or -43dBV in the technical specification. These two values intend the same issue - they'as soon as suggestion to just expressed differently.

If two microphones are subject to the same SPL and one generates a difficult output voltage, that microphone is said to have a progressive allergic reaction rating. Although knowing how to right to use/compare microphone sensitivity (output) is important, the actual allergic reaction rating usually is not a major consideration in mic selection. Typically the design of a microphone for a particular application plays a role when manufacturers determine the take over output level. For example, lively microphones are typically less painful than condenser mics as they'in report to generally used fairly stuffy to the hermetic source. Listed out cold are the typical specifications for three every other microphone transducer types: