WAT ‘S ACOUSTICS????.......
IT IS THE SCIENCE OF SOUND WHICH INCLUDES ITS PRODUCTION,TRANSMISSION, EFFECTS OF SOUND AND OTHER PROPERTIES
THE STUDY OF ACOUSTICS HELPS TO : To analyze the problems involved in the propagation of sound. To
suggest ways and means of producing optimum condition of hearing.
To
obtain both subjective and objective assessments of the results.
BASIC PRINCIPLE… Minimization
of external noise. Harmonic development of the functional elements of the theatrical Space within the limits of the human vocal and acoustical scale(theatre Form, capacity). Sufficient emergence of directly propagated sound and positive sound reflection . Limitation of the reverberation of time, elimination of echoes. Limitation of capacity (700 to 1000) and axial plan. Creation of closed space plan (from seating area and stage building with limitation of lateral opening at the side entrancesParadoi). Harmonic development of background scenery(position ,height, length) i.e. backstage in order to neutralize the harmful, lateral sound reflection . Sound barriers to be used to control outdoor noise protection.
BASIC PRINCIPLE…
BASIC PRINCIPLE… OUTSIDE THE THEATER An
outdoor theater can be planned to seat as many as 3,000 spectators without the use Large enough to handle one car for every of amplification for the actors' voices . three spectators . As an upper limit for Designed to permit convenient and the seating, is about 2,500 . speedy exit following the performance, with good access from traffic routes . Surfaced with gravel or asphalt and provided with good drainage under all conditions . Well lighted for ease and security in parking and walking . So arranged as to permit the quick departure of any car in case of an emergency during the performance . Convenient to the box office and the entrance to the theater . Located where the noises and lights of late-arriving cars will not disturb the
BASIC PLAN SHAPES…
SITE SELECTION… The MUNICIPAL GARDEN THEATRE is site as taken and analysis of sound measurements done based on size and volume ……..
NOISE MAPPING OF THE AREA
PROTECTIVE MEASURES
SITE SELECTION… THE EFFICACY OF BARRIERS TO THE INTERCHANGE
SITE SELECTION…
Identify
the type of noise (interior or external air-borne, impact, equipment
noises) ; Identify
the cause of the noise, the surfaces through which it is transmitted in order to treat them; Assess
the intensity of the noise perceived (in dB), define the maximum level
of noise Acceptable
for premises or housing and thus define the insulation input
needed; Identify
the nature of existing surfaces to be treated (breeze blocks or hollow bricks, concrete, cellular partitions, plaster boards, wooden or hollow flooring, etc.) ;
INTERIOR TREATMENT BARRIERS: USE TO BLOCK TRANSMISSION NOISE
non-reinforced
barriers reinforced barriers pipe and duct lagging transparent barriers specialty barriers
CASESTUDY ON REGENT’S PARK (OAT)
Regent's Park Open Air Theatre , in the City of Westminster, London, is a permanent venue with an annual sixteen-week summer season.
It was founded in 1932 by Sydney Carroll and Robert Atkins The
theatre is located in Queen Mary's Gardens, on the inner-circle of Regent's Park and consequently is surrounded entirely by parkland. It
is completely uncovered; the only sheltered area being underneath the tiered auditorium, which houses one of the longest bars of any theatre in London stretching the entire length of the seating —
CASESTUDY ON REGENT’S PARK (OAT)
City Country Owned by Capacity Type
Westminster, London United Kingdom Regent's Park Theatre Ltd. 1,200+ seats Open air theatre,
Opened
1932
Rebuilt
1999
CASESTUDY ON REGENT’S PARK (OAT)
The
theatre is planned radially
Here
,the trees are used as sound Barriers Trees
are behind the backstage and in the front to block the transmission of sound
The
auditorium is one of the largest in London with 1,240 seats, yet with a wonderful outdoor
feel. The steeply raked auditorium keeps this theatre experience intimate.
DIAGRAMATIC…. POSSIBLE PATHS FOR EASY SOUND REFLECTION
HALL PROGRAM RANGE OF ACOUSTIC VOLUME…. Theatrical and amplified events only 200-300 ft3/seat Unamplified music (excluding pipe organ) 300-450 ft3/seat Organ music 450-600 ft3/seat
A balance of sound reflecting, absorbing, and diffusing sounds must be designed to achieve reflection patterns and reverberation time appropriate to the given program in the space (speech, music, amplified events, etc.).
Different programs have different acoustic requirements: Speech, drama and amplified music require shorter reverberation times typically less than 1.2 seconds. Symphonic, opera and organ music all require longer reverberation times typically greater than 1.6 seconds.
COMMON SHAPES THAT PROMOTES SOUND DIFFUSION
