This video is a full lesson on how to apply compression for beginners, and some of the different technics you can use in your mix. Goes over the text book de...
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Reciprocating Compressor
A reciprocating compressor is a machine that makes use of an internal mechanism to compress a gas by means of positive displacement. These machines typically consist of a crankshaft driven piston in a closed cylinder equipped with intake and outlet valves. The compressor functions by drawing gas into the cylinder, compressing it, and sending it out into a holding tank or supply line. This cycle is repeated continuously producing a constant supply of compressed gas. The reciprocating compressor is generally electrically or engine driven and available in a range of sizes and designs for use in a wide variety of industrial and domestic applications.
The term reciprocating refers to any repeated back and forward or up and down motion, and in this case applies to the repeated cycle the compressors piston follows. Positive displacement is the process of taking a set quantity of a fluid or gas and displacing or forcing it into an outlet or discharge line. A piston type reciprocating compressor functions by drawing a body of gas through an intake valve during the piston down-stroke and compressing it on the up stroke. When the piston reaches the top of the up-stroke, an outlet valve opens allowing the compressed gas to exit the cylinder into the supply line. This process is repeated constantly, thereby producing a steady supply of compressed gas.
Reciprocating compressors are usually driven by electric motors or gasoline and diesel powered engines. Smaller do-it-yourself (DIY) versions and commercial units installed in factories or plants are typically electrically operated while those designed for mobile use are engine driven. Large industrial compressors may feature multiple cylinder designs and often include the option of utilizing any number of those cylinders depending on demand. Small domestic models typically have only one cylinder, which feeds compressed air to a storage tank or directly into the supply hose.
These machines are used to compress a variety of gasses that include air, hydrogen, oxygen, refrigerants, and hydrocarbons. The gasses they compress may be fed directly to another part of the process or into a storage tank for later use. Air compressors are generally used to drive pneumatic tools or equipment while other gasses are compressed as part of an industrial process such as air conditioning, chemical production, and crude oil refinement. The reciprocating compressor is typically utilized where high compression ratios are required with fairly low flow rates. The use of a reciprocating compressor is usually restricted to applications where the gasses involved hold very little moisture.
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Refrigeration Compressor
A refrigeration compressor is an essential part of what makes refrigeration technology work. A compressor is like a small motor — it consists of a piston, a crankshaft, and a connecting rod that connects the piston to the crankshaft. Similar to the engine in a car, a refrigeration compressor produces compression over its stroke as it is operated.
As the piston moves up and down in the cylinder, it will compress whatever is in the bore of the compressor. This essentially forces anything in the bore of the compressor into a smaller area through the use of the compressor technology. In a refrigerator, this is used to push refrigerant through. A refrigeration compressor is run by electricity, and the compressors have an electric motor component that powers the piston and crankshaft in order to compress the refrigerant being used.
Each refrigeration compressor has a cylinder head at the top of the compressor assembly. There are also valves in the cylinder head of a compressor. One set of valves, called intake valves, allow refrigerant to enter the cylinder, and the other set of valves, known as exhaust valves, allow refrigerant under pressure to leave the cylinder.
In a refrigeration compressor, the values used are reed valves. These are very thin valves that are easily moved by the pressurized refrigerant at the proper time in the cycle. Once the refrigerant is pressurized, it passes through the system, where it expands and cools. This expanding and cooling process occurs because of the laws of thermodynamics, which dictate that as a liquid expands into a vapor, it absorbs heat.
Refrigeration compressors often require a capacitor as part of the electrical system as well. This requirement exists because the compressors need the extra boost of capacitors when they start up. A capacitor is like a small battery that stores an electrical charge and allows the compressor to use some of that charge when it starts up to help it begin to compress the refrigerant and do its work powering the system.
Some refrigerators have independent compressors for the refrigerator component and the freezer component. These are widely thought to be more efficient, but dual compressor refrigerators are generally more costly than those with a single compressor. In any case, compressors do not run constantly, but instead automatically turn on intermittently when necessary to ensure the appropriate air temperature inside the refrigerator.
The author is associated with IPFonline.http://www.ipfonline.com is India's No. 1 Industrial Product Finder. The portal is a veritable storehouse of information on industrial products/services.
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Portable Air Compressor
A Portable Air Compressor is an air compressor with the ability to be transported easily. There is no true definition of a portable air compressor simply because the term portability means different things to different people. Some may feel that only a compressor that is easily carried is portable. Others may feel that any air compressor that can be easily lifted into a car is portable.
In most cases, a portable air compressor is considered one that can be moved by hand. In those situations, the small air compressor is used often for emergency roadside situations, such as when a tire needs inflated. This is done by connecting the portable air compressor hose to the tire via a valve stem. Once accomplished, inflating the tire is relatively easy.
In some cases, the unit may be a cordless air compressor. If that is the case, the portable air compressor simply receives its power from batteries. Those may be permanent batteries capable of being recharged with a cord, or may be more standard batteries that can be taken out and recharged or discarded of.
Some portable air compressor units may run off the DC current generated from the car. This is a very convenient way to power the device in the event that there is no other way to do it. Due to the fact the compressors are mainly going to be used in situations where cars are already present, it seems only natural that they run on energy the car produces. The only way a portable air compressor would not work in this situation is if the battery in the car was dead, or the cord connecting the two were damaged.
One thing that should be kept in mind about portable air compressors is that they do not often pack the energy many other types of air compressors do. With a larger air compressor, inflating a tire may be done easily in less than a minute. With a small air compressor, it may be much longer than a minute. Many come with a tire pressure gauge built in, which can help users keep track of when the tire is reaching its desired pressure.
Most portable air compressors run between $ 15 US Dollars (USD) and $ 100 USD. The difference in the price mainly accounts for the power it is capable of reaching and whether the device is cordless. Some may have other features as well, such as a flashlight and even flashing emergency lights to warn other motorists to keep away.
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Screw Air Compressor
Air compressor screw air compressor equipment Kangpu Si air compressor equipment - Screw Air Compressor with pre-sets of configuration, a single power supply connection and compressed air connections, and built-in cooling system, and installation work greatly simplified. Kangpu Si screw air compressors with its advantages of high-performance, high efficiency, maintenance-free, highly reliable consistent for all sectors to provide quality compressed air. Screw air compressors, screw compression components, using the latest CNC grinding machine internal manufacturing, and with a line laser technology, to ensure that the manufacturing tolerances are extremely accurate. Its reliability and performance to ensure that the operating costs of compressors in use during the period has been very low. Are the L / adjust the compressor, one compressor and desiccant in the compressor of the LS series of new products.
Twin-screw compressor is a biaxial positive displacement rotary type compressor, the main is the main (positive) pairs (yin) two rotor with the composition of the meshing pair, the main and auxiliary rotor tooth external casing inner wall to form a closed volume, twin-screw less than 40 cubic meters and above models need to add speed increasing gear, increase power consumption and easy locking head; worm compressor is a single-axis displacement rotary compressor, meshing pair is composed by a worm, and two symmetrical layout of the star wheel by worm screw channel and star of the tooth surface and the casing inner wall to form a closed primitive volume, but less than is the material of the star wheel film has yet to be improved.
With excellent reliability, little vibration, low noise, easy to operate, less wearing parts, high operating efficiency is its biggest advantage.
The screw compressor is a positive displacement compressor, the air compression is achieved by alveolar volume change of the yin and yang rotor installed in parallel to each other within the chassis mesh and. Rotor pair it with precision chassis rotation between the rotor alveolar gas continue to produce periodic volume changes along the rotor axis, the discharge side of the suction side of the push to complete the inhalation of compressed exhaust three working process.
Screw air compressor is a single-stage twin-screw compressor fuel injection, divided into single-screw air compressors and screw air compressors, efficient pulley drive, driven by the host rotation for compressed air, through the spray oil for cooling the compressed air within the host, the host of air emissions and oil-gas mixture through coarse and fine two separate oil from the compressed air to separate, and finally clean compressed air. Cooler for cooling the compressed air and oil.
The body of the screw compressor is divided into two, one for the belt drive, and the other for direct-drive. Belt drive is more suitable power of about 22KW compressor, two pulley speed
Pages: 1 2What is a Multiband Compressor?
Also known as MB or MBC.
These divide the incoming audio signal into multiple bands, with each band being compressed independently from the other.
The beauty of this is that with full band compressors, that we have been discussing till now, the whole signal is treated, so when a peak is detected, the whole signal is compressed and so other frequencies are also subject to compression.
Multiband compression only compresses the frequency bands chosen, so a more fluid and less abrupt result is gained. Instead of having one peak trigger the compressor into compressing the entire signal, the multiband allows for individual bands to be compressed.
On some compressors, you even have the option of selecting bands that will not undergo any treatment.
In essence, a multi-band compressor comprises a set of filters that splits the audio signal into two or more frequency bands.
After passing through the filters, each frequency band is fed into its own compressor, after which the signals are recombined at the output.
The main advantage of multi-band compression is that a loud event in one frequency band won't trigger gain reduction in the other bands.
Another feature of the multiband compressor is that you are offered crossover points. This is crucial, as you are given control over where to place the frequency band. Setting these crossover points is the heart of the compressor and crucial in processing the right frequency spectrum with the right settings.
For example: if you are treating the vocals in the mid range but put your low end crossover too far into the middle range, then the low end compression settings will also affect the mid range vocals.
Multiband compression can either be a friend or enemy.
It all comes down to how you use it and when. It can be a great compressor for controlling problematic frequencies, or for boosting certain ranges in isolation to others.
Use with care!
Eddie Bazil (Zukan)
http://www.samplecraze.com
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The Effects Of Using An Audio Compressor
Audio Compressors do more than just change the dynamic range of a song or track. Audio compressors do allot more than you think they do and I’ll explain what some of these things are.
When using a compressor during tracking (hardware compressor if your recording into a program like pro tools or sonar) it will allow the engineer to record the track at a higher level than normal. Like if the compressor decreases your signal level by 4dB on the hottest parts, the entire tack can be recorded 4dB higher to make up the reduced gain. This will make the soft passages of the track hotter as the loud passages will be least affected. While the compressors really control the loud passages, the final result is an increase in the soft passage levels.
A lead vocal track that is compressed will sound more up from in the mix, when compression is used correctly.
Bass guitars are most always compressed. Because of the low frequencies it possesses. If not tamed, the low frequencies will saturate the overall mix level and this can make your song level artificially hot. When the bass guitar is compressed correctly, the low will be tamed and your mix can be mixed and mastered at a proper level.
The pumping effect is an effect of a compressor when the level control of reducing the gain as the amplitude passes the threshold. Then it turns it back up when the signal falls below the threshold.
The breathing effect is the same as the pumping effect, but the breathing effect is heard with high frequency airy sounds only.
After reading these things, you now can see what I was talking about when I said, “audio compressors do allot more that just change the dynamic range of a track or song.
I hope you learned some tips from this article and I hope you put them into practice during your next audio recording or audio mixing session.
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A demonstration of an efficient and simple way to tune a dynamic compressor. The example is for a stereo audio mix but the principle applies to all sound sou...
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Audio Compressor Tips
A compressor is an mechanical volume control that turns loud parts of a music signal down when the VCA see’s the signal larger than a certain level that was set by the user. This makes us able to bring the complete volume of the song up and in return, the softer sounds get louder. In return, we can print the entire track with a louder signal level. Its a fantastic tool for recording instruments with a wide dynamic range.
The 5 Parameters of a Compressor:
Threshold is the point where the compressor starts recognizing the signal’s amplitude. When the amplitude rises above an established, it will start to act in a way defined by the attack time, release time and ratio settings. There are 2 ways that the threshold works. It can boost the signal up into the threshold or it can be moved down into the signal. In both the ways, the only part of the audio that gets processed is the part that goes above the threshold.. After the signal goes above the threshold, the VCA turns down the part that is above the threshold, leaving the rest of the signal unaffected.
Attack Time controls the amount of time it takes the compressor to turn down the signal after it passes the threshold. The attack time need to be adjusted just right. If its set to fast, then the compressor can turn down the transients and that can cause the instrument or song to lose its life.It can also effect vocals if its set to fast by making the ‘t” and ‘s’ sounds disappear. The opposite can happen if the attack time is set to slow. It will exaggerate the ‘t’ and ‘s’ sounds because it will pass through uncompressed because of the long attack time.
Release Time is the time it takes the compressor to let go or turn the affected signal back up when It gets below the threshold.
Fast release times work very well with the fast attack times and slow release times work very well with the slow attack times. Release settings are crucial, because if its set to fast, it can boost noise that is between the notes and if its set to low, it can compress a quieter note that follows the note the was above the threshold.
Ratio determines how extreme the VCA action will be. The ratio is a comparison between what goes through the threshold and the output of the VCA. The first number of the ratio will indicate the increase of how much dB will result in 1dB of increased output. The higher the ratio is, the more compression there is.
Output Level makes up for reduction of gain that the VCA causes. If the was reduced by 5dB, the output level can boost the signal back to its original level.
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