BSE Co., Ltd.

Electret condenser microphone

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  • Company Name:BSE Co., Ltd.
  • Membership:Free Member
  • Registration Date:2004. 05.23
  • Country/Region:Korea 
  • City:Incheon
  • Contact:Jinsoo Park  
  • Related Keywords:microphone
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BSE Co., Ltd.

58B-4L, 626-3, Gozan-dong Namdong-ku Incheon
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Jinsoo Park



One of the most important types of commercial microphones is that which uses a capacitor (in early days of electronics, this component went by the name, condenser) The conventional form of this instrument is one in which the charge on the capacitor is essentially constant. This maybe realized by connecting a voltage source to one of its two electrodes through a large resistor(the other electrode being grounded). Alternatively, the fixed external charge, Q, stored by the capacitor may derive from the permanent electric polarization of a dielectric material, such as polymer(metallized on one side). Charges in spacing between the diaphragm and a back plate, due to impinging sound waves, give rise to a voltage variation across the terminals of the capacitor Instruments of this type are referred to as electret condenser microphones(ECM)


  • The sensitivity is defined as the output voltage for a specified acoustic stimulus and load condition. In this catalog it is expressed in(dBV/10 bar). In the case of dynamic types it is expressed as the open circuit voltage appearing at the output terminals. In the case of electret type it is expressed with a specified resistive load and supply voltage since the output resistance tends towards constant current characteristic.

Output impedence

  • The output impedance represents the internal electric resistance within a microphone as seen from the side of output terminals of the microphone.In the case of ECMs, the effective output resistance is determined mainly by the value of load resistance. it can be made higher or lower by the value of load resistance with a corresponding change is sensitivity.

Frequency response

  • The frequency response of a microphone is value indicating which frequency range, from the lower to the higher range.
    In other words, it is the frequency range which the microphone can receive sound. It is expressed as 50Hz~1500Hz.


  • a dB(decibel)is a way of expressing a ratio of two numbers. For acoustic pressure the expression is dB=20log(P1/P2). So, if P1 is 100 times greater than P2, P1 is 40 dB greater than P2. dBV=dB relative to 1 Volt.(Voltages expressed in this discussion are rms values).

SPL(sound pressure level)

  • SPL is short for Sound Pressure Level, which is a convention for expressing loudness. The units are dB SPL. 0dB SPL has been assigned to 20uPa, which is about the lower threshold of hearing. Sound pressure drops as distance from the sond source increases. At a five foot distance, the SPL of a normal speaking voice is about 60 dB SPL on average..


  • a microphone that picks up sound better from one direction than another. a directional microphone has two or more sound ports. Its output is proportional to the difference in pressure from one side of the diaphragm to the other


  • An omnidirectional microphone (also known as a pressure microphone) is a microphone that picks up sound equally well from any direction. It has one sound port. Its output is proportional to the SPL (sound pressure microphone that picks up sound equally well from any direction. It has one sound port. Its output is proportional to the SPL (sound pressure level) at the opening of the sound port.


  • A unidirectional microphone is a directional microphone that improves the signal-to-noise ratio compared to an omnidirectional mic, if it's close to and pointed at the sound source.

Noise cancelling

  • A noise cancelling microphone (also known as pressure gradient or close talking) is a directional microphone designed for use close to the talker's mouth. Its directional pattern looks like a figure 8, and is called cosine or bidirectional. Thus, the front and rear ports are interchangeable. This microphone is used in headset booms or hand-held microphones. It provides the greatest signal-to-noise ratio available for acoustically transducing a person's voice.

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