Weak current College】 【sound reinforcement systems in which the peripheral equipment.

The entire set of performance audio system has the necessary equipment; the entire sound reinforcement by the first part of the sound source, and then through the sound mixer, Xun, the collection and then sent to the amplifier, power amplifier for signal amplification of processing, and finally sent to the speakers. Sound reinforcement system is put some little voice raised to give hundreds of thousands of people have heard.

A basic sound reinforcement system to have the above equipment is indisputable, but such a system and it is very basic, there is nothing in the General requirements of the case. But in a different environment, sources, on the reinforcement of sound requirements these factors exist, PA systems will have to attach some equipment to help to achieve the perfect sound reinforcement process as a whole. These basic outside equipment, is the so-called peripheral equipment.

The following is in sound reinforcement system can be equipped with some peripheral devices:

1. Equalizer: through the different frequencies or band signals respectively promotion, attenuation or resection, to achieve improved processing beautify timbre and transmission quality.

2. the effects: through mechanical or electronic means to simulate closed indoor sound signal delay and reverb characteristics that make the music more rich and cohesion, and can produce some special sound effects.

3. compressor, limiter: this is the size of the gain as the signal of the amplifier. Its role is to audio signals for dynamic range compression or expansion to beautify the signal
The distortion, prevention or reduction of noise, and so many different purposes.

4. the actuator: in original musical signal in the frequency range of harmonic constituents include appropriate to simulate live performance environment reflection, so that the signal is more natural in sharp sense of presence and delicate
And more penetrating.

5. divider: in order to improve the efficiency of the power amplifier, reduce speaker on frequency distortion and improve sound quality. Divider will audio distribution, signal sent to the band power amplifier for on
Big.
6. retarder: in some larger, more group speaker for sound reinforcement systems, often with a retarder. Because the sound from the speakers arrives at different positions in the listener's ears is an absolute priority, so as to improve the sound quality, not with images and sound are not a feeling. Retarder to signal for delay processing, set the proper order.

7. noise gate: used in drum group up, because when microphones against radio crosstalk between, other applications are also quite a lot. Noise gate is an electronic gate circuits, when the input signal level exceeds the threshold, adjustable on the circuit, the signal is passed.

8. feedback suppressor: feedback is mainly due to the receiver's acoustic gain is too large, the microphone and speaker too close, or sound field in certain frequencies of sound reflection State too active, resulting in the sound of the normal circulation of amplification. Signal input feedback suppressor, normally can be any of the 50Hz-15kHz feedback frequencies into the shifter, phase processing before the audio signal is fed into the machine's input, the audio signal to filter out the sound feedback frequencies.