【 Weak current College 】 sound reinforcement system why use compression, limiter?---Power By 【 China power house network 】

Human auditory sense of dynamic range [can withstand the maximum loudness and can feel the most quiet sound loudness of range up to 100 million: 1 (that is, 106 x)] to listen to the dynamic range of up to 120dB. Sound reinforcement system sound playback dynamic range due to the limitations of electronic equipment is much smaller than the dynamic range of the human ear is small. Minimum sound loudness is not related to noise in the system, so that small voice signal drowned in the noise to be heard; maximum loudness of the sound signal clipping distortion and signal clipping produces a large number of harmonics, damaged speaker units (especially the treble speakers). To this end, the dynamic range of the control signal, the volume on the dynamic converter has been widely used. Simply put, it is a limited dynamic range of the audio signal to an electronic device, the quiet small signal becomes louder, the high rate of spikes become smaller, and no signal clipping, protect the speakers and the amplifier from shocks and damage.
Singing karaoke is usually music news in 110 decibels, vocal dynamic in 90 decibels below, that is the sound of music (accompaniment) can easily exceed the human voice, according to the human ear effect at least cover the human voice to the accompaniment of singing about 13 decibels can clearly hear your own sound effects, singing karaoke usually have such a feeling, start small in order to lift the accompaniment of singing atmosphere will put the accompaniment to feel normal position, when the song sung to the climax, his voice was music cover up, basically my only loud shout until the very last moment, or ejaculated. of course unknowingly easily exhausted this is singing karaoke metropolitans. only professional talents know how tired where.
Compression/limiter and Extender make amplification system of practical benefits including:
(1) limits the music signal in the great peak signal protection speaker system and amplifier system from damage.
(2) to gain a greater voice gain, because down signal peak, can make the program in other small signal amplitude is fully raised.
(3) the programme of small signal does not fall into the mixer of noise, and improves the signal, the signal noise ratio.
Their negative effects is: If the device has four basic parameters (the threshold level, the compression ratio, action time and release time) was not applicable at the time, the adjustment will appear "pumped" and "breathing" or simply unable to signal to control the dynamic range.
We specifically for karaoke issues in-depth thinking, design can solve the problem of the product, enter a minus 60 DB is 30 decibels when output minus 15 dB dynamic. (Can also be customized according to customer requirements, so that no dynamic) Special comfort is that it does not expand the distortion, and increase the noise level of the professional recording reach, because all the automation, the operation in particular simple. professional equipment operation interface, you need a professional sound engineers achieved satisfactory results, but how many people are professional, if handled well outweigh our compressor has the most reasonable control time, starting from the control point and recovery time, precision and design in internal, completely stable, and science are ideal results. Moreover the kernel is to use the professional import audio device, in order to achieve the desired result regardless of cost. (In the professional market a high-performance compressor valuable).