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Types of microphones and comparison of digital microphones with analog microphones

Time: 2019-03-30
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1.The types of traditional microphones mainly include condenser microphones and dynamic microphones.


The condenser microphone is characterized by high sensitivity, a very wide frequency band, low nonlinear harmonic distortion, and high maximum sound pressure level. Disadvantages are poor mechanical strength, poor moisture resistance, polarization voltage, and troublesome use.

 

The dynamic microphone is characterized by reliable and convenient to use, no external power supply, good mechanical performance, long life and low price. The disadvantage is that the sensitivity is slightly lower and the frequency response is poor. If a microphone is installed on the microphone head, it becomes a wireless microphone. Flexible and convenient for mobile use

Beta /87a
Wired Condenser microphone
BETA/58
Wired Dynamic microphone
SLX24/SM58
Wireless Dynamic microphon
2.The choice of microphone should be determined according to the environment of use and the characteristics of the sound source.

Recording conversations indoors, generally using a dynamic microphone, because the frequency band of the conversation is narrow, using a dynamic microphone can avoid unnecessary noise. For music recording, you should choose a condenser microphone with good performance to meet the needs of wide frequency band, large dynamic and high fidelity.

Live performances outdoors, because of the high ambient noise, super-directional microphones can be used to increase selectivity.

When using a microphone, be careful to keep a distance of about 0.3 meters from the sound source to prevent distortion, except for the microphone. For recording in motion, use a wireless microphone. If you need hand-free, you can choose a headset microphone or a lavalier microphone.

When using a wireless microphone, be careful to prevent interference and “no signal zone.” This can be solved by changing the radio frequency, adjusting the transmit and receive antennas, and adding an antenna amplifier.

3.Comparison of digital microphones with traditional analog microphones:
The biggest advantage of digital microphones is their strong anti-interference ability. The digital wireless system modulates the radio carrier into digital signals by modulating the radio carrier in several steps. The digital audio signal arrives at the receiver without being affected by electromagnetic noise. Any RF noise below the threshold will not affect the audio quality. The receiver simply ignores anything that is not 1 or 0. All other signals are discarded. Only digital signals will be identified.

Issues to consider: 
1. Digital systems may require 10%-20% more budget than analog systems.
2. Digital systems can cause delay problems. In analog devices, audio signals are transmitted at the speed of light, and the underlying factors are not critical. However, in digital devices, the upcoming analog audio signal needs to be converted to a digital signal. The signal is then converted back to the analog signal. A large number of delay values can cause problems, and most high quality digital systems produce delays of less than 5 milliseconds, which is generally acceptable to most listeners.


AXT-220D  
Good performance digital wireless microphone: Working effective distance 400 meters
SKM9000
The ideal environment for operating radius of 100 meters, used in a variety of high demand occasions

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