Digital Audio System Of Theater And Its Transmission Network

- Sep 05, 2018-

A typical theater audio system should include sound source, mixer, peripherals, and signal processing equipment, amplifiers, speakers and transmission systems. According to the characteristics of the theater, it is generally divided into audience hall sound reinforcement system, stage return monitoring system, effect sound reinforcement system, control room monitoring and monitoring system, peripheral electro-acoustic processing auxiliary system, sound collection and sound source playback system.

The audio system generally picks up various sounds on the scene through a microphone set on the stage, converts it into a current signal, and sends it to the audio system center control device through the transmission cable: through the mixing console (also known as the mixing console), for various inputs. The sound source signals are matched, amplified, mixed, tuned, and distributed.

Electroacoustic system control includes two aspects, one is the processing of sound quality, such as equalizer, exciter, amplifier, noise reducer, etc., on the other hand is the control of signals, such as compressors, distributors, frequency dividers, Speaker processor, etc.

The peripheral processing equipment processes and retouches various program signals, compensates for the defects of architectural acoustics, compensates for the lack of performance of electroacoustic equipment, and produces special sound effects.

Signal processing equipment is an important part of the theater audio system and a key device for system debugging. The traditional signal processing method is to interconnect various processing devices of different functions and different uses with a plurality of dedicated cables and devices such as a mixing console and a power amplifier to form a sound reinforcement system. The modern signal processing method is a DSP processing chip that uses dedicated high-precision floating-point arithmetic in one device, supplemented by various efficient audio data algorithms to replace traditional equalizers, exciters, and effects, noise reducers, etc. Work on a variety of devices. Features like multiple devices are all integrated on one device, and the signals are digital before and after processing.

A speaker is a converter that converts electrical energy into sound energy. The theater audio system hopes to restore sound in the range of 20 to 20 kHz, and currently any type of speaker is difficult to meet the needs of wide-band sound reproduction. Because playing a bass requires a heavy, large, and thick cone diaphragm, and playing a treble requires a light and thin diaphragm, the speaker system that plays back the full range is generally composed of three different types of speakers: treble, midrange, and bass. The unit combines the system of components.

The sound field system of the general theater auditorium is divided into sound bridge speakers, side speakers on the frame, lip speakers, fill speakers, and effect sound speakers. The acoustic bridge loudspeakers usually adopt three layouts of left, center and right. The loudspeakers on both sides of the frame are used to cover the auditorium, which lowers the sound image position; so that the audience feels that the sound is not transmitted from the height of the sound bridge but from the stage. The lip speaker is used to fill the 3rd central area of the auditorium and lower the sound image position. For the occlusion of the lower auditorium and the occlusion area of the lower speakers with poor coverage of the main speakers, a complementary speaker is required. The effect sound speaker produces special effects such as surround effects, sky effects, etc.

 

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