Sound System DesignDifferent locations have different acoustical requirements and each has its own unique solution. Sound systems are all different types of sites developed, ranging from big box retail stores open top, take churches, acoustically damped auditoriums. Each of these stages in different design challenge. Provided that the intelligibility of speech is an important factor in the situation, is a few guidelines are followed to the sound system is understandable.Fundamentals of soundPrior solutions to improve the intelligibility sound system, let a few basic principles of economic efficiency.
Sound is the propagation of pressure waves through a medium (in our case air). Sound Pressure Level (SPL) was set at a logarithmic scale of decibels. That pretty much describes, is how loud the sound. Also, because sound propagates in the pressure waves, a frequency with the sound in units of hertz, Hz are given. Low-frequency bass and treble frequency is high. The established audible range of human hearing is about 20 Hz (Bass) to 20 kHz (Treble). Average speech has a frequency of 200 Hz to 10 kHz. The conversation has an average sound pressure level (SPL) of about 70 decibels (dB). A jet engine is about 120 dB, while a quiet office is about 40 dB. Speech Transmission Index (STI) is a measure of speech intelligibility. This depends mainly on a number of factors, including, as the chamber response as well as how much background noise in the room. Articulation loss of consonants (Alcon) is another metric used to measure their comprehension. Alcon’s focus on how much loss there is, the consonants in the spoken language. The reason for focusing on consonants is based on the fact that higher frequencies are emitted in the speech consonants. Vowels usually emitting bass frequencies of the throat, while the high frequencies to produce consonants.What causes that sound bad?Now we have some of the basic principles of have rated well, let’s talk about the main causes of poor sound to speak. There are a few factors that contribute to a terrible-sounding room. www.catchyourmatch.net meet ukrainian women
Place completed on the stands at a high school gymnasium in the beginning when your little brother, John, who was been called by the announcer. All you hear is a jumble of J’s and not even hear the name mentioned as a location echoes and finally stops. The problems with this type of situation are the hard surfaces and reflect the sound waves reflected. The hard wood floor, painted toes glow bright walls, hardwood stands, and the steel cover, echo the tone for any help. Another factor is the problem that the volume of the speaker is usually very high. In an event like this in a gym with a large crowd, the speakers would be set at the closest to 100 dB or higher. Sites like this usually use a cluster of speakers away from the audience. This is also a factor that added to the Hall. A combination of all these elements are in the “bad” solid profit, independent site.
The reverberation time is the time it takes a solid within a place to come to an end after he bounced back and forth from the surfaces. A simple test is to stand in the room and clap your hands or pop a balloon and how long it takes to be measured course it still again. Some of the worst places in the world reverberation time of 6 seconds or more. These sites usually have smooth tile or stone floor with high walls and ceilings, even the most slippery like cathedrals.Good acoustic design guidelinesNow that we understand the causes of the problems in the room, we take a look at what can still be echoing the worst room in an acceptable acoustic situation.First, see if it is possible to add some of the sound absorption in the room. Whether carpet or acoustic tiles on the ceiling, the additional absorption significantly reduce the reverberation time and will certainly help the acoustics. This is the first and most important step. It is also the lightest and simplest solution. In the above example, if the gym had some carpets rolled up on the hardwood areas, the acoustics are improved. Even some curtains on the walls did have an influence. The main absorption is often overlooked people. If the room is almost empty vs. full of people in the stands there will be a significant difference.
The distribution of people in the stands will help reverberation is made of hard wood.Acoustic treatments such as ceiling tiles or acoustic ceiling spray are usually very expensive. Another factor is the architectural design limits. Facilities, such as a glass conference room or auditorium marble were especially selected for their aesthetic effect. Cover them with acoustic panels or spray is not an option. In such cases, the next best thing that can be done it is focused on designing the system. Determine where the audience and the speakers, so they are addressed directly to the audience. Reduce the volume of the sound, it is at least possible for the application. The more noise there is in the hall, the sound more to the public. The less sound from the speaker is, the less reverb and more readable.Moving the speakers is another option for improving the acoustic system. If the sound through the air. This means that it loses energy when you increase distance from the speaker. If the speaker is emitting 94 dB at 20 feet, then 10 meters away from the speaker of 100 dB SPL. The rule of thumb is that you lose 6 dB for each doubling of the distance. Reduce the gap of the speaker and the audience and the volume, to improve their comprehension. to use some highly reverberant spaces such as churches and cathedrals built-in speaker Bank. These speakers are in the pew and focus on the public in a very short distance at low volume is. This helps the immense reverberation would be present if the speakers firing sound through the room. This example of an audio speaker system is distributed. This is better, a speaker cluster in a reverberant space.ConclusionEach has its unique acoustic properties. A good system designer must have a basic understanding of how sound behaves and also have the tools to control these acoustic energy in a productive way are used in the palace. There’s really no method for solving all problems of the acoustic one place. A detailed and designed solution using a combination of the above guidelines will result in dramatic improvement of the problematic acoustics situation. Acoustic consultants to this task and in general with the architect in the design of local work. Unfortunately, sometimes the acoustic consultant early enough not to require one, designed the difficult acoustic spaces, the result of creative solutions for this application involved. Other times, the cultivated area and no acoustic reflections were offered acoustic problems when it is time for a sound system is. In any case, it is important to study and to check each site carefully and build a custom solution.