Sale of dynamic sound processing devices. Official distributor of VISIONHITECH CO.,LTD.(VISION)

Image is nothing, sound is everything!

Devices that make music attractive include compressors and limiters. It is known that the sound signal consists of sounds of different loudness. Very quiet harmonies and very loud harmonies can be combined in the same composition. Compressors and limiters make weak sounds louder and strong sounds quieter, saving the listener from having to listen and protecting them from the discomfort that deafening sounds can cause. Essentially, compressors and limiters, in a sense, normalize the audio signal by compressing its amplitude, forcing it to be within certain threshold limits.

Equalizers. Frequency response under strict control

In addition to the graphic, there is also a parametric equalizer in nature. Analog devices of this type are characterized by fewer adjustable bands, but offer more opportunities for fine adjustment of the frequency response of the signal. Currently, digital parametric equalizers are widely used. They offer three adjustable parameters: operating frequency in hertz; the quality factor of the signal or the width of the operating band around the operating frequency; gain level of the selected operating frequency in decibels.

Reverbs. Perfect sound in less than ideal conditions

A modern digital reverb is a complex device that solves a single, but difficult task - it recreates the effect of natural reverb where it is very difficult to obtain it in the usual way. The whole difficulty of the problem lies in the fact that the natural effect is made up of very complex sequences of reflections and re-reflections. Only the best expensive reverbs can reproduce it.

Even the best reverb has at most five reverb algorithms, but they can have hundreds of sound options created by changing many parameters. In order to simplify the work with such devices as much as possible, manufacturers put in them sets of standard settings for rooms of various types and sizes.

Exciters and enhancers. The sound of noble blood

Zero Defect, High Quality, Best Service and Excellent Customer Support are words that have become synonymous with Visionhitech. Based on the dynamic growth of CCTV systems, Vision hi-tech is focused on producing the highest quality products for residential and commercial security.

Founded in 1997 Vision hi-tech has become one of the leading CCTV solution provider and security camera manufacturer in Korea. Vision hi-tech highly qualified engineers and experts guarantee 100% customer satisfaction. As a result of the pursuit of higher quality, higher reliability and excellent support, our products are used in many industrial and commercial complexes, law enforcement agencies and residential security around the world.

Products:

Zero defect, High quality, Best service and Perfect support for Customer's success are words that have become synonymous with Visionhitech. Based on our plentiful experiences on CCTV System & Products, we have dedicated ourselves to manufacturing the highest quality products for residential and commercial security Camera & system, Digital video Camera & surveillance equipments, Special purposed cameras and accessories.

Established in 1997, we, as Visionhitech become one of the leading CCTV Solution provider & Security camera manufacturer in Korea. Our well-skilled engineers and various well-organized experts are extremely guaranteed 100% customer satisfaction and customer success through their dedicated efforts. As a result of our commitment to higher quality, stronger reliability and continuous services, our best products are utilized in many hundred thousand of industrial facilities, commercial complex, law-enforcements and residential security all over the world.

With the strong reputation of offering high-quality products and excellent customer service, Visionhitech have built up and implemented ISO 9001 International quality management System since 2002, 03 to ensure as well as continuously improve our product quality and satisfaction of customers. During 2000 ~ 2003, we have acquired 10 of patents for creative design, 18 of patents on practical utility model and 5 of patents for innovative new technology, total 33 patents for security camera. These figures show that we are truly new technology - oriented manufacturer and are consistently striving for the principal development of security industry.

Being the best of the CCTV solution provider with a global network, all members at Visionhitech does our utmost for better technical improvements, superior service and extreme assistance.

Customers are always right. We will be at your back for your success.

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"Based on high competitiveness of technology and rapid expansion of sales, we will make a myth of Vision Hi-Tech in the field of CCTV security camera industry."

The word of Vision means a desirable figure of the future. In order to improve an ability concerning "Vision", it is needed a desirable company that see through the changes of future circumstances, especially brought by Science technology development, and deal flexibly with them.

Vision Hi-Tech Co., Ltd. started as a "manufacturer of CCTV camera" in Sep. 1997. And then we developed the world's first & smallest 1/3" CCD Camera Module. When we ever manufactured CCTV cameras for customers satisfaction, all members of Vision Hi-Tech have worked as one harmoniously to be a leader of the 21st century in the related industries based on continuous technology development and stable growth & employment.

Vision Hi-Tech has led the market of CCTV security camera and related sectors in perfect preparation. Based on high competitiveness of technology and we have achieved a rapid expansion of sales in 2001, 2002 and we will be one of the best manufacturer in the world who will lead the market with new technology and innovative products in 2003. And, with a further step, as "Vision Hi-Tech" connoted we will continuously create new value for the benefit of security industry
In the end, We will do our best to be a company, Vision Hi-Tech, trusted with the best quality and loved by society through new knowledge and value creativity.

thanks,
CEO of Vision Hi-Tech Co., Ltd. Son Kyong Sik.

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Summary & History

2005. Nov Certified ISO/TS16949 Quality management system for Automotive use
2005. Sep Established 1st local sales branch at Yongsan
2005. Mar Awarded the prize by Commissioner of Chungbu Regional Tax offices Tax payer day

2004. Nov Awarded the Prize by The President for "The Million Dollar Export"
2004. Mar Awarded a "KT-Mark" - Excellent Korean Technology by the Ministry of Science & Technology and by the Korea Industrial Technology Association

2003. Dec Awarded a Prize by the administrator of small and medium industry for its great Contribution to the development of the industry
2003 Feb Established "Visionhitech research and development center"
2003 Feb Developed "True Day & Night Camera"

2002. Dec Certified "INNO-BIZ" - Enterprise of innovative technology (SMBA)
2002. May Certified "Enterprise of superior technology"
2002 Mar Certified ISO 9001/2000 Quality management systems

2001. Jul Certified "Venture Enterprise" (SMBA)
2001. Jul Certified "Promising Enterprise" (Wooribank)

2000. Sep Registered as a member of Korea Trade Association
2000. Sep Established "Vision Hi-Tech Co., Ltd."

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company instruction

Visionhitech_s prestige
We would like to deliver our commitment that we guarantee a full satisfaction to our customers by keeping one core mission to be happy with customers. Understanding its mission is not enough but should be capable of fulfilling it. We do know how hard it is to commit with. However we dare can tell it through our positive experiences resulting in a successful business relationship and continuously growing output by keeping our word. All Visionhitech members know from the bottom of their heart that they will be happy when their customers are happy. Building up our customers reputation to the highest level is our primary concern.

products reliability
It is the most important factor we focus on. All members of Visionhitechs staffs and its employees are well educated to work every thing perfect at each position. We do care for the job aiming to No returns caused by the faults at the factory and Make the products strong enough to reduce defectives by the end users as well.
The products reliability comes mainly from the circuit design and careful choice of good quality materials at R&D stage. And then good technology of PCB, SMD and final assembly determine the reliability. All those are achieved under the comprehensive understanding on both technical and commercial activities and dedicated cooperation with our suppliers and customers.

Products Design
Visionhitechs business philosophy is to provide the products that are originated from the customers point of view to maximize their profit and reputation. We have long been specialized in the miniature size cameras for professional applications. Normally small sized cameras are developed by skipping some components without being protected from long time reliability or by sacrificing some less important functions. Obviously the life span of the camera become far less than ordinary big sized cameras when it is done under unqualified conditions. Our staffs have been dedicated for the miniaturization of CCD cameras for the past 12 years resulting in creating a lot of worlds fist and worlds smallest innovations. All of them of course include full components and features in order to safeguard of reliability and to be usable for professional applications. So all our products show significant differences in design, size and quality from others.

Service
Visionhitech definitely is not satisfied with simply providing its products. We strive to satisfy customers with advanced technology and ultimate services under the notion that a companys future lies in the hands of the customers and their end users. Service activities thus are not limited only to the service department but are well recognized as an overall activity from whole of company organizations. We secure for a better future of our customers with reliable quality, quick delivery, perfect maintenance, continuous supply and good price.
To help this policy, we start ISO9001-2001 Version customer satisfaction system from Dec., 200.

picture quality
It is often asked Whose chip set the camera is used with? rather than Who is the manufacturer of the camera? Picture quality means clear image, good performance of low light sensitivity and distinct resolution without picture noises. Those factors are highly determined by the engineering skill of each manufacturer rather than by the source of CCD chip set. That is why the picture quality from each manufacturer shows a different level. The engineer must have a deep understanding on the characteristics of all components used for the camera, a deep knowledge about the effective way of circuitry and PCB design, enough experiences for wide applications, proper trouble shooting solutions and so on. More than 90% of the products quality purely depends on the engineering capability not on the chipset. For us it doesnt matter what chipset we use as it is not so important. People are pushed to believe that cameras used with famous brand chipset makes always the camera good in quality. This is totally not. Why? It is because of the fact that each camera is made by a different level of technology. The sure way to evaluate the best camera is to compare the quality face to face.
Visionhitech cameras always lead the picture quality as being the best in this field. We dare to tell it as Visionhitechs know-how.

Market Policy
We promise to keep our faith to become a leading company with continuous efforts for developing new innovative products with an aim to play a key role in the 21st century, the era of dramatic changes. We commit ourselves to focus all our activities in view of our customers prosperity. We have the faith deep in our mind that the jobs are possible from close cooperation with customers based on strong trustworthy relationships and the faith to share the benefits of our success with our customers together. We have the faith the success has its meaning only when we can contribute to the happiness of global citizens. So our new innovations will be carried on the basis of making life of mankind more convenient and safe.

Development of new technology having the value for the benefit of human being, holding strict faith to think the right way is our market philosophy. We owe a lot to our customers what we have achieved so far. But we never satisfy at our current success because there are so many things to do for the sake of our customers. Our ultimate goal is to support our customer to the extent they become the leader in this industry. We feel it is our holy duty while it is alerted that more customers do not make more success. We are determined to associate with as less customers as possible throughout the world.

The rotating head is a modern type of lighting equipment designed to create a spectacular lighting accompaniment for various festive concerts, events, parties, etc.

In this section of the catalog of our online store, both new items and well-proven ones are presented. examples of world leaders in production. We hope that now, in order to buy a rotating head, you will not need to look for additional material according to technical parameters, but it will only be enough to select and compare the information provided by us and make a choice among manufacturers of rotating heads. Easy navigation, as well as a detailed description of each model. Significantly simplifies the task of choosing the most suitable equipment

Here you will find the most affordable models, as well as the most advanced, expensive rotating heads suitable for professional use. Selected rotating models G Tins can not only create a luminous flux of any color, but also project color photographs onto any surface. Thanks to such equipment, it becomes possible to organize truly exciting light performances.

You can buy heads with LEDs from us. This is a modern version of equipment that has a number of advantages over other light sources. LEDs are extremely economical, which reduces the load on the power grid and reduces energy costs. LEDs do not heat up as intensely as gas discharge lamps or incandescent lamps during operation, which allows the use of more types of filters.

The service life of the LED is up to 50,000 hours, which is a guarantee of the high reliability of the devices we sell. In addition, such a light source allows you to achieve the highest frequency stroboscopic effect.

Buy rotating LED head

Our online store is ready to deliver rotating heads purchased from us, as well as light theater equipment to any region of Russia. You can easily find all the information regarding the terms of payment for equipment and its delivery to you in the relevant sections of our website.

A human hears sounds with a frequency of 30 to 20,000 hertz, and a bat up to 100,000 hertz, although the lower limit is approximately equal to ours. So this tiny flying ball, covered with wool, lives in the real world of sounds. Just like a dolphin, this creature finds the food it needs with the help of an echo locator. Scientists have been working on bat sonar for a longer time than dolphin sonar. Back in 1793, the outstanding Italian explorer Lazzaro Spallanzani established that bats navigate and find their prey with the help of hearing. However, it took about 150 years to understand that they are doing this with the help of ultrasonic location. And here it is impossible not to appreciate the work of American scientists G. Pierce, D. Griffin and R. Galambos, who made an invaluable contribution to deciphering the operation of the ultrasonic locator in bats.

Like dolphins, bats have an ultrasound generator and reflected echo receivers. Both devices have reached perfection in the process of evolution. The larynx of bats is very wide. It, like a resonator, allows you to amplify the ultrasounds created by the whistle. But mice emit not just a whistle that is not audible to our ear, but a series of ultrasonic clicks. Before taking off, the mouse sends 5-10 signals per second, the search began - the frequency increases to 20-30 clicks, and the mouse overtakes the insect at 250 signals per second. How the mouse produces a continuous series of beeps is not yet known.

In different types of bats, generators differ in structure. In some, smooth-nosed, sounds, as we said, are made by the larynx, so such a bat flies with its mouth open. Most of the smooth-nosed mice live on the North American continent, but we also have their representatives. The smallest of them - bats - are found in the Moscow region and almost throughout central Russia. At dusk, you can easily see how they hunt for insects against the still unfading sky. By creating a series of signals, the bat, like all smooth-nosed bats, sends ultrasound in all directions, and then picks up the reflected signal. Another group of bats - horseshoe bats, which can be found, for example, in the Caucasus, generate ultrasonic signals not with their mouths, but with their noses. Around their nose is a fleshy, horseshoe-like outgrowth that allows ultrasound to be reflected and collected into a narrow tuft. The horseshoe bat flies with its mouth closed, the impulses last a thousandth of a second (100 ms), while in smooth-nosed it is a click of only one millisecond (Fig. 5). Therefore, if the horseshoe goes to a low frequency, its signals resemble the ticking of a wristwatch.

The bat's echo receiver is also a perfect device: after all, it is able to hear an echo that is 2000 times weaker than the signal sent by the generator. It is quite understandable that large ears are needed to pick up such weak signals; and in some species they reach almost half the total length of the head and trunk. So, in ears with a size of 8 centimeters, the ears are 4 centimeters long. The inner ear also has a special structure. Recall that vibrations are transmitted from the middle ear to the inner ear by the stirrup, and the part of the ear of bats, located next to the stirrup, is greatly expanded.

Well, now about the most interesting thing - the device of the sound receiver of bats, which makes it possible to protect it from the cry-impulse sent by its own locator. After all, the impulse sent, as we said, is 2000 times stronger than the received reflected sounds. With such a sound, the mouse can stun itself and then hear nothing. To prevent this from happening, before the ultrasound pulse, the stirrup is pulled away from the window of the cochlea of ​​the inner ear with a special muscle. The vibrations are mechanically interrupted and do not reach the inner ear. In fact, the stirrup also makes a click, but not audible, but "anti-sound", it immediately returns to its place after the cry-signal, and the ear is ready to receive the reflected signal. It’s just amazing how fast a muscle can contract and relax, turning off the mouse’s hearing for the time of the sent impulse-scream! When flying high, this is only 5 pulses per second. At a lower flight altitude - 10-12 impulses, and when pursuing prey - 200-250 impulses per second. Of course, at the highest frequency, the muscle does not have time to turn off the ear each time, but the echo is so strong that even with the stapes retracted, the bat most likely hears signals reflected from an insect located a few centimeters from its muzzle.

You can't say anything, the bat echo-location system is a perfect radar installation operating in the ultrasonic range. Its mass is not more than 7.5 grams, and it contains both a transmitter, a receiver, and a computing device - the brain. Recall that a man-made radar installation weighs tens of kilograms and for its transportation you need a truck or a car specially equipped for a radar installation. Of course, the radar works on radio waves, not on ultrasound, its range is much greater than the ultrasonic locator of bats. The principle of location is the same for them, but the living system is much more efficient, given its meager mass.

One can only be surprised at the ingenuity of nature and the evolutionary mechanisms that formed ultrasonic devices in living beings. Bats hear ultrasonic vibrations up to 100,000 hertz, while moths and lacewings, which they hunt, perceive ultrasonic signals up to 240,000 hertz. Their "ears" are reminiscent of the auditory organs of the grasshoppers discussed earlier. As soon as the insects hear that they are being located by a bat, they begin to perform aerobatics, spirals and dead loops, if only the bat misses and grabs them. And since insects are more agile than bats, they often manage to dodge their pursuers. But the relationship between butterflies and bats does not end there. Recently, it was found that some butterflies themselves are able to produce ultrasonic pulses. As soon as the insect detects that the bat is tracing its path with locating signals, it itself begins to emit ultrasonic pulses. Moreover, these impulses have such an effect on the pursuer that he flies away, as if frightened.

What makes bats stop chasing an insect emitting ultrasonic signals?

So far, there are only speculations about this. According to one of them, ultrasonic clicks are adaptive signals of insects, similar to those sent by the bat itself, only 1000 times stronger. Expecting to hear a faint reflected sound from his signal, the pursuer hears a deafening roar, as if the supersonic aircraft were breaking the sound barrier. According to other ideas, which are held by the famous animal sense researcher R. Burton, night butterflies emit ultrasonic warning signals for bats. If you like, this can also be called mimicry, only not visual, but ultrasonic. Many insects tend to merge with the environment and acquire the appropriate protective coloration. A number of poisonous insects, on the contrary, are dressed in the brightest colorful "suits". This is a color warning. But for bats that hunt at night, bright colors don't matter. Poisonous insects use ultrasonic warning signals. It is possible that harmless butterflies also comprehended the protective role of these signals and scare bats with them. Here is a kind of mimicry.

How, in a long evolutionary process, did insects acquire the ability to perceive ultrasonic signals and instantly understand the danger that the "signals" of a bat carry? It is even more difficult with the ultrasonic signals of bats - no screams-signals of fellow tribesmen (and sometimes there are more than 20,000,000 of them in one place, like in the Bracken Cave in the south of the USA), no artificial ultrasonic signals created by man with the help of equipment interfere with hunting bats. They recognize their echo among millions of voices and other sounds, and the reproduction of the signals created by the butterfly makes the mouse fly away. These signals are extremely matched to the locator of the flying animal, and perhaps their clicks are heard exactly at the time when the bat turns on its ear to hear the echo. If this is so, then the night moth has time to receive the frequency of the impulse that locates it and send a response, taking into account the approach of the hunter, exactly in unison with him. Such a device cannot be formed gradually, in the process of selection and improvement. The insect receives it immediately ready-made, only then will it save his life. This is how a complex sound locator poses a new riddle in the evolution of living things, which scientists have not yet solved.

Bats emit ultrasounds not with the help of the vocal cords, but due to the whistle. It is not clear how you can whistle with clicks. But the possibilities of ultrasonic location are higher than the location at the frequency of audible sounds. Firstly, ultrasound propagates in a directed beam, and secondly, the location improves as the wavelength decreases - the reflected echo from small objects is less distorted. High-frequency sounds emitted in the laboratory by clicks, like those of dolphins or bats, allowed blind people with well-developed hearing to recognize objects and the material from which the objects under study were made, although they, of course, were far from the possibilities that "living" people are capable of. locators".

Cats also hear ultrasounds. In our "kiss-kiss" there is a whole chord of ultrasounds, and, perhaps, in it, cats hear a series of whistles in a large range. Dogs are not inferior to cats, they can even be trained to resort to the owner at the signal of an ultrasonic whistle. The upper limit of hearing is different in humans. Children can hear higher sounds than adults. A case is described when a four-year-old boy woke up at night, woke up his parents and began to insist that "it" was screaming and squeaking. The parents didn't hear anything. At first they thought that the child saw something in a dream and began to calm him down. After a while, the child again screamed that "it" squeaked and that there was someone in the room. Parents, in order to calm the child, began to search the room and found ... a bat clinging to one of the curtains. In fairness, it can be noted that the child would still not hear the ultrasounds on which the bat locates insects, most likely, these were signals sent by other bats at frequencies of low-wave ultrasound, somewhere in the region of 25,000 hertz.

Not all animals have such a sophisticated and sophisticated echolocation apparatus as bats and dolphins. Some animals use their sonar only for orientation in dark caves. So, in Southeast Asia, swifts-salangans live in caves. They are famous for their nests of thick, congealed saliva. In oriental cuisine, they are used to make soup and are called "swallow's nests". In caves, salangans make clicking sounds up to 5-10 times per second and determine by echo where the walls are and where the nests are. Another bird, the guajaro from South America, also spends all day in dark caves and flies out only at night to feast on the fruits of the trees. In a dark cave, she navigates with the help of sonar, making piercing, staccato cries with a frequency of about 7000 hertz.

One evening at the dacha, I heard thin and sharp squeaks. What could it be? I took a flashlight and went to the source of incomprehensible sounds. In the beam of the flashlight stood my cat, and in front of him, as it seemed to me at first, was a tiny mouse. After some time, we managed to consider that this shrew is the smallest insectivorous mammal of our fauna. With any attempt of the cat to move forward and grab the shrew, it emitted such shrill squeaks that the surprised cat jumped back. Whistles, of course, were produced in the ultrasonic range, which frightened the cat even more.

Shrews are known to be great specialists in reproducing ultrasounds. But shrews use ultrasounds not only to scare away their enemies, they also use them for echolocation. Biologists had to work hard before they discovered the echo-location system in these mammals. The experiments had to be carried out in complete darkness, and the animals were observed with the help of night vision devices.

The scientists took two platforms, washed them thoroughly to eliminate olfactory orientational effects, and moved the platforms apart at different distances. With a successful jump, the shrews received their favorite food. As usual, the animal ran up to the edge of one platform, examined it, and then, with an accurate jump, moved to another platform, from which the path led to food. If the distance between the platforms was 17 centimeters, the shrews easily found the second platform and jumped onto it. As soon as the distance was increased to 25 centimeters, the jumps stopped, the animal rushed along the edge of the first platform, felt where the second was, but it was very difficult to overcome the huge “chasm” for it. These experiments helped scientists to establish that shrews use ultrasound for their location.

We got acquainted with the inhabitants of air spaces, caves, terrestrial creatures and inhabitants of the sea depths, which have ultrasonic echo-locators, striking in their perfection and showing the ways of creating new radar instruments.

Designed for sound processing, which can be divided into four main groups: Dynamic processing devices, Frequency processing, Modulation processing, and Spatial and temporal processing devices. Devices for dynamic sound processing: Compressor, Limiter, Expander, And Gate. Compressor- A device that compresses the dynamic range of a signal. Compressor attenuates the volume of the sound, in cases where the signal has exceeded a certain, predetermined level. Limiter- A device that does not allow the signal to exceed the set volume level can be implemented using a compressor. Expander- A device whose operation is opposite to that of a compressor. Expander expands the dynamic range of the signal. Gate- a device capable of cutting the signal below the set threshold. It is used to eliminate noise in the pauses between useful signals. Gate, able to cut the "tail" of the signal, which will make the sound clearer. Frequency signal processing devices:Graphic equalizer,Parametric equalizer. Graphic equalizer- a device with sets of frequencies specified by the manufacturer, at each of which, you can amplify or attenuate the signal. Parametric equalizer- the most common frequency sound processing device that allows you to select a frequency band, and in this frequency range, attenuate or amplify the signal. Modulation signal processing devices: X orus,flanger. Horus- a fairly common modulation processing device, the principle of which is based on a floating signal time delay, Horus creates the effect of multiple instruments sounding when only one is sounding. flanger- similar device Horus, but with a slight difference, which is the use of feedback, and the appearance of additional resonant frequencies. Sound time processing devices:delay,reverb. delay- a device with an echo effect, with the ability to adjust the time delay. Reverb- a frequently used device, the essence of which is to attenuate the signal during multiple reflections of this signal from obstacles, with the achievement of a surround sound effect. Effects of mountains, large concert hall, sound effect under water, etc.

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