![]() Remember that audio signal level is reduced in half (6dB) every time the distance is doubled. In sporting events, surveillance, and nature sound recording, getting close is not an option, and only a properly designed, quality parabolic microphone can offer suitable SNR, Signal to Noise Ratio. For distant or low level sound sources, microphone self noise should be low, below 10dBA is recommended. However, shotgun mics do not increase signal levels, their main purpose is to minimize unwanted sound sources since they offer a narrower polar angle. If the sound source is from a fixed point in the distance, a shotgun microphone may work if the signal level is sufficient. For 360 degree pickup, an omni-directional type is preferred. For close work, lapel or hand held, cardioid-type microphones are typical. The audio source will change what type of microphone is best to use. The desired SNR is usually in the 40-60dB range. Ideally, an audio source should be very close to the microphone to obtain the largest signal level without interference from surrounding sounds or the microphones own self-noise. Capturing audio for sound reinforcement, broadcast TV, live shows, video projects, and natural backgrounds requires the use of different types of microphones. Hopefully, after studying this information, you will find something of benefit, and learn more about the Wildtronics products as well.įirst, we will briefly discuss some of the different types of microphones used in audio recording. The Article on Audio Noise will explain dBs and many other topics that will help you understand this Article. With many years of outdoor recording experience, audio and industrial electronic and mechanical engineering backgrounds, resources in Physics, machining, and manufacturing, and knowledge of wildlife we may be able to help you with our series of Articles. ![]() Included are techniques that work well, and techniques that should be avoided. In this article, we will discuss the details of parabolic microphone design and their capabilities. Common uses are nature recording, sporting event sound reinforcement, surveillance, to drone detection. A well designed parabolic microphone will single out or isolate a single subject in a field of competing sound sources. Parabolic microphones are a type of microphone used when sounds are too weak for normal microphones, when a highly directional microphone is needed, or to boost sounds so they can be clearly heard by the human ear.
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