![]() ![]() ![]() But some reflections are indeed worse than others. You want only direct sound to be recorded. Well, ideally you do not want any reflections in your recording. And if the tonality is changed, you are not recording what you are really saying, or rather not the way you say it. This effect is known as “comb filtering”. This delay between the two sound waves (direct and reflected) can result in phase differences in the waves.As the direct sound waves of your voice and the reflected sound combine, the time/phase delay can cause cancellations and/or reinforcements in the sound waves, changing the tonality of what you are recording. How long the delay depends on how far away the nearest reflective surface is. The problem is that the microphone will record the sound from the voice over actor a very short time before the sound reflected off the walls gets to it too. In reality a voice over actor is positioned right in front of a microphone, so the microphone will pick up the sound coming directly from you, the speaker, but it will also record the sound waves reflected off by nearby walls and other surfaces. WHY REFLECTIONS ARE BAD FOR YOUR RECORDING However throw a ball against a pillow and it will stop, because the direct energy will be absorbed by the pillow. Also, sound waves are omnidirectional, meaning that they go in all directions at once, so when they reflect they also interact and affect each other). But will diffract (bend around) around objects that have dimensions smaller than 12ft wide. ![]() So our 100Hz wave will bounce off a roughly 12 ft wide wall. (This is just a simplified example, in reality a surface has to have a dimension equal to a wavelength to reflect sound in this manner. The harder and flatter the surface – the stronger the reflected sound and the longer it will be bouncing around before it dies. Their behavior in the room can be compared to that of a tennis ball: they bounce from hard surfaces and being slowed down (absorbed) by soft surfaces.Īnd so on until it loses its energy. At mid and high frequencies, say 100Hz or so and above – sound waves are more straightforward and easier to control. Low frequency sound waves cannot be reflected by a small obstacle, so it bends around objects in the room and passes through lighter materials. As we discussed in the previous article, lower frequency wavelengths are long, and sound waves are more powerful. One of the biggest factors that determine what happens with sound in a room is the frequency of the sound wave. Number of factors – the frequency of the sound wave the shape and dimensions of the room the materials that the walls and ceiling and floor are made of and covered with how many doors and windows are there, and where they are placed, location of the microphone and voice actor in relation to the nearest walls, etc., and the contents of the room ( furniture, tapestry, equipment etc.) How your recording is affected by the way sound waves behave in a room depends on a HOW THE SOUND BEHAVES IN A VOICEOVER STUDIOĪ sound energy can be reflected by the surfaces in the room and bounce around or it can be partially absorbed, lose some of that energy and bounce around a bit less, or it can hit an odd shaped object, break apart and go in different directions with diminished energy (diffused).These behaviors can be problematic in a recording studio – sound waves bouncing inside the room can interfere with each other, cancel or reinforce the energy at certain points, which makes recording in the room difficult. The same exact process happens in your studio, except that you might not hear it as loud as in a cave, but a sensitive microphone will pick it up and you recording will be “inadequate”. This is because the sound reflects from one hard surface and goes to the other and reflects over and over again until it loses its energy. If you are in mountains, a cave, large hall or an empty room say something or just clap your hands – that sound gets back to you as an echo ( reflections) and repeats itself over and over (reverberations) until it loses its energy and dies (reverberant decay). ![]() When we talk about sound reflections, think echo. What are sound reflections and reverberations and why do you need to care? Sound reflections and reverberation management in a Voice Over Recording Studio. ![]()
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