【 Weak current College 】 compression using method

Compression is generally divided into two main functions: noise gate, compressor and limiter.

A, noise gate

1, threshold (THRESHOLD)
Noise gate as the name suggests is can reduce system noise, in the normal image, it is like a reservoir of water, it blocks the silt is underwater. If the water is too low, the silt in the water will flow across the gate just obscene; if the gate is too high not only stopped the useless mud, also stopped useful Clearwater. Therefore noise gate threshold level or threshold (THRESHOLD) to transfer to just good, just like the reservoir as to sluice in tuned to the appropriate height. Of course, in order to be able to complete the mud to block off, we can increase the height of the gate, so while also blocking off some water, but also do a foolproof, compared, or worthwhile.
2. recovery time (RELEASE)
A longer recovery time conducive to excessive signal of gentle, otherwise the recovery time is too short will be abrupt, the sound will appear choppy. Image: If our mouth sneezes, because from the mouth to the closing time is short, so the sound is very abrupt, this sound is easy to make people aware; if we tired stretch long relief when you open your mouth to shut your mouth between the time a long time, so the sound is a relatively gentle excessive, relatively easy to perceive this sound. This is why we put the music volume to slowly down, can't it off because it off too abrupt, make people feel uncomfortable. Recovery time (RELEASE) I want to use to interpret the electro-acoustic principles and some people is very difficult to understand, this metaphor is very easy to understand.

B, compressor and limiter
1, threshold (THRESHOLD)
Compressor parts of THRESHOLD spin and noise gate sections of the THRESHOLD is differentiated or gate to describe it: noise gate THRESHOLD sluice is in a very low gate, its in the reservoir at the bottom of the inlet, the main role is to block out into the reservoirs in themud; compressor THRESHOLD of the gate is a sluice, the inlet to the top of the reservoir, if the water is too high, the reservoir into the water is too large, there will be in danger of collapse, if too low, the water in the reservoir is not enough, so in order to achieve maximum safety of inventory, the gate will be adjusted to the appropriate location. Therefore the threshold (THRESHOLD) of the regulation is important, it decided a compressor for the level begins to work.
2. compression ratio (RATIO)
Compression ratio (RATIO) and threshold (THRESHOLD) in line with the work, or gate to describe it, 6: 1 compression ratio is like an upstream flow beyond the 6-metre reservoir safety range, but after the compression process of reservoir inflow to after the last water is 1 m high, this reservoir or safe. Then, for example, set the compression ratio is 4: 1, each additional 4dB of input level will only result in the output level changes with 1dB. When the compression ratio set in 6: 1, compressor becomes limiter, when adjusted to ∞: 1 (infinite), then no matter how much input level increases, the output level will not change, this is the role of the limiter.
3. start time (ATTACK)
Start time refers to when the signal level exceeds the set threshold (THRESHOLD) level, to press for the length of time it started to work as a gate to the length of time you can open the. If you start time too fast, may slightly influence the musical tone head of dynamic and intensity; if the start time is too slow, and affect the level and nature of the music, but also will produce transient must delay and turbidity. Are we therefore or do you want to move to start a short bit of some good.
4, recovery time (RELEASE)
This design would also like to refer to the start time (ATTACK) and music features for reasonable adjustments.

3. press for specific adjustment method

A, noise gate adjustment method
1, threshold (THRESHOLD): adjust the volume when you pull down the sound mixer total, system do not have a little people-the audio signal, turn the adjust knob, see noise gate indicates a red light and then a little, but not increase much, otherwise useful music also to suppress. As mentioned above, to the appropriate gate than standard raise the point, even if intercepted some clear water can be.
2. recovery time (RELEASE): noise gate recovery time and Compressor in the recovery time is slightly different, you can fit it long, comprehensive, should more appropriate in around 500ms.

B, compressor and limiter adjustment method
Different compression devices have different adjustment knob and parameters, but the following four points are the most compression is the most basic standard function knob:
1, threshold (THRESHOLD) adjustment
Threshold adjustment to adjust with the compression ratio, the easiest way is to turn off the amplifier, the compressor is in front of peripheral equipment to normal working condition, and then open the mixer volume to the normal performance of maximum volume of positions, basically this mixer on level signal LEDs will light up red light, then adjust the compressor for threshold (THRESHOLD) knob, adjust the compressor in the compresses indicates start flashing red light indicates when the compression is already starting to work, then the threshold (THRESHOLD) produced on Basic. Note that the compression ratio must be open to greater than 1: 1, otherwise the compressor is equal to the passthrough, is without any compression effects.
2. compression ratio (RATIO) of the set
Compression ratio is set to a certain extent, too small, does not function, the compression too high, resulting in music dynamic range narrowed, sound, dry and tasteless. In GeneralShow the compression ratio can be set at approximately 3: 1; in taxi high large dynamic audio signal system, the compression ratio set at about 5: 1; use as a limiter, should set the compression ratio of 14: 1 in infinity (infinity).
3. start time (ATTACK) adjustment
Just now we have to start time quick little be better, or would affect the characteristics of the music. In summary, the start time to be more appropriate in between 50ms-80ms.
4, recovery time adjustment (RELEASE)
Recovery time on the contrary, the need to slow down, recovery time should be between a suitable 400ms-600ms.

Compression method for adjustment
Compressor for each single channel from left to right, seven adjustment knob, respectively:
1, noise gate threshold level (THRESHOLD), the transfer to clock a little over 9 points;
2, the noise gate compression ratio (RATIO), the transfer to the clock of the 14 point location;
3, threshold (THRESHOLD), this is very important, General adjustment to clock 13 point location;
4. compression ratio (RATIO), general performance system adjusts to the clock of the 13 point location, the disco system adjusts to the clock of the 14 points of location;
5. start time (ATTACK), adjusted to the clock of the 10 o'clock position;
6, recovery time (RELEASE) General adjustment to clock 14 o'clock;
7, output level (OUTPUTGAIN), General adjustment to clock a little more than 12 point.