because it allows only direct sound to reach the audience .they are even made up of sound proof wall with the concept of two walls and a gap between them so that the sound does not go out and disturb the other people and in another hand to much echo and reverberation makes the sound muddled and we cannot hear anything (dialogues )etc .clearly.therefore , sound absorbing materials are kept in the cinema halls.
By lining the walls and other hard surfaces with curtains, drapes, foam panels, or other sound absorbing materials.
The http://wiki.answers.com/Q/What_are_Reverberation_in_concert_halls_caused_by man single reflections from the walls, the ceiling, and the bottom.
hi erinSimply to improve the way travels throughout the room.The sound of music in halls (acoustics or reverberation) will be altered due to the timing of echoes within the hall and the rate at which they decay away. Echoes with a long delay are generally undesirable and confusing to the ear, so large sheets of hard material (baffle boards) are suspended within the hall and used to reflect sound (make echoes) at short delay times from the stage, rather than allowing the sound to travel as far as the walls or ceiling to create echoes at long delay times. Baffle boards may also be curved in order to disperse echoes to make them less obvious to the ear. Soft absorbent materials are used to prevent echoes from distant parts of the hall which might otherwise create echoes with long delay times. The soft furnishings of seating, carpeting and even the people in the audience will absorb sound and reduce echoes. The essential quality of a concert hall is called the "reverberation characteristic" which is a measure of the timing of the echoes and the rate at which they die away. In a concert hall, a certain amount of reverberation is desirable and pleasing to the ear, while in a recording studio reverberation is prevented as much as possible. Concert halls are regarded generally as having "lively" acoustics while recording studios are regarded as having "dead" acoustics.
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Herkie Walls was born in 1961.
Cinema halls are designed with sound-absorbing materials like carpets, drapes, and acoustic panels to reduce echoes. Additionally, strategic placement of speakers and sound diffusers helps distribute sound evenly throughout the hall, minimizing echoes and improving sound clarity for moviegoers. Proper calibration of audio equipment also plays a crucial role in minimizing echoes in cinema halls.
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In bass concert halls, the sound is amplified by the size of the open empty room. The sound reverberates off the walls to make it sound louder and deeper than it really is.
Reverberation in concert halls is caused by the reflection of sound waves off the walls, ceiling, and other surfaces in the space. These reflected waves mix with the direct sound from the performers, creating a lasting and rich acoustic environment that can enhance the listening experience.
Sound absorbing material is used in the walls of auditoriums to stop undue reflection.It is also used in offices,aeroplanes,hospitals and factories to cut down noise.
The curtains provide attractive sound deadening so that it doesn't echo in the theater. Some theaters just use other sound absorbing methods but the curtains are something of a hold-over from the older theaters where plays and concerts were performed in the past and have a nice appearance.
By lining the walls and other hard surfaces with curtains, drapes, foam panels, or other sound absorbing materials.
Anechoic chambers work by absorbing sound waves to prevent reflections. This is achieved using sound-absorbing materials on the walls, ceiling, and floor to minimize reverberation. The goal is to create a space with minimal sound reflections, allowing for accurate acoustical measurements and testing.
Materials such as foam, carpets, curtains, and acoustic panels are effective at absorbing sound by reducing its reflection and decreasing echoes in a room. These materials work by dampening vibrations and reducing the amplitude of sound waves as they travel through them.
An example of a soundproofing device is a acoustic foam panel, which helps reduce noise levels by absorbing sound waves and preventing them from bouncing off walls. These panels are commonly used in recording studios, home theaters, and noisy environments to improve sound quality and reduce sound transmission.
Hard reflexions from walls reflect the sound and add it to the direct sound. That gives amplification of the total sound.
Around 250, varying from large custom built facilities, to converted walls in sports halls, schools, etc