The completion of a performance not only has requirements for the performer, but also has requirements for the stage sound, and many people may think that the stage sound is not a visible equipment such as speakers and mixing tables. In fact, the stage sound equipment in the professional audio system designer, there need to be 10 different equipment to support the entire stage sound system, which can play the stage sound effect to the extreme, let's see what specific equipment:
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1, mixer: has multiple channel input, each channel sound can be processed separately, and has left, right channel, mixing, monitoring output of a sound mixing device. It is an important equipment for sound engineers, sound engineers and composers to create music and sound.
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2, power amplifier: the audio voltage signal into a rated power signal used to drive the speaker sound equipment. The matching condition of the power amplifier is (1), the output impedance of the power amplifier is equal to the load impedance of the speaker. (2) The output power of the amplifier matches the nominal power of the speaker.
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3, frequency divider: The circuit or device to achieve frequency division is called the frequency divider. There are many kinds of frequency dividers, according to the different waveform of its frequency divider signal, there are two kinds of sine frequency divider and pulse frequency divider. Its basic function is to divide the full band audio signal into different frequency bands according to the requirements of the combined speaker, so that the speaker unit can get the appropriate frequency band excitation signal and work in the best state.
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4, reverberator: In the song and dance hall sound system and large stage lighting concert venue, a very important part is the reverberation of the human voice. After reverb treatment, a kind of aesthetic feeling of electronic sound can be produced, which makes the singing have a unique charm. It can mask some defects in the voice of some amateur singers, such as hoarse, guttural and high-pitched vocal cord noise by reverb treatment, making the voice less harsh. In addition, reverberation can also make up for the lack of overtones in the timbre structure of amateur singers who have not undergone special vocal training. This is very important for the effect of stage lighting concerts.
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5, modulator: Because people's voice conditions are different, the tone requirements of the accompanying music are also inconsistent when singing, some people want to be lower, and some need to be higher. In this way, it is required that the tone of the accompanying music should adapt to the requirements of the singer, otherwise it will feel that the singing and the accompaniment are very disharmonious. If a companion tape is used, a modulation is required for modulation processing.
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6, effect device: provide sound field effects, including reverberation, delay, echo and sound equipment for special processing of sound.
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7, pressure limiter: is a combination of compressor and limiter collectively. Its main function (1), protect the power amplifier and speaker (speaker). (2) Create special sound effects.
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8, equalizer: It is a device that improves and attenuates different frequencies and adjusts the ratio of bass, midrange and treble. The implications are twofold. (1) Make the necessary compensation for the frequency response curve of the audio equipment or carrier so that the output sound is not distorted. 2, in order to create the needs of the sound signal processing to meet the requirements of listening. Under normal circumstances, the use of this equipment is not much, so most people will choose to rent it temporarily to audio rental businesses.
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9, speakers and speakers: speakers are devices that convert electrical signals into acoustic signals. According to the principle, there are electric, electromagnetic, piezoelectric ceramic electrostatic and pneumatic. The speaker box, also known as the speaker box, is a device that puts the speaker unit into the box, which is not a pronunciation part, but an acoustic part that displays and enriches the bass. It can be divided into three types: closed speakers, inverted speakers and labyrinth speakers. The speaker equipment is very conscious of the position factor given to it when the stage is built.
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10, microphone: microphone is a kind of electroacoustic transducer that converts sound into electrical signals. It is one of the most diverse units in the sound system. According to its directivity, it can be divided into non-directivity (round), directivity (heart, super heart) and strong directivity. The non-directivity is specially used for band pickup. Directivity is used for voice, singing and other sound source pickup; Strong directivity is specifically to pick up a certain orientation of the sound source sound and to exclude the left and right sides and behind the sound outside the microphone picking space, and specifically use the principle of sound wave interference phenomenon, the use of acoustic interference control made of a slender tubular microphone, people called gun microphone, used in art stage and news interviews; According to the structure and application range, there are moving-coil microphones, aluminum microphones, capacitive microphones, pressure zone microphones - PZM, electret microphones, MS stereo microphones, reverb microphones, modulation microphones and so on.
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The sound system seen on the stage seems simple, but it is actually composed of 10 kinds of sound equipment, so it is said that three minutes on the stage, ten years of work under the stage, not only the performers, but also the staff behind the scenes, especially the technical staff of the stage sound system