Principe werking SDCS volgens DAVOC

Werking volgens de website van DAVOC

a small glance

Techniques As you know calculation of the code for moving picture requires a complicated algorithm. In 1987 the development of a new system started, in order to store the enormous amount of data, which must be available for the Electronic Repair Branch.

For this purpose a unique database was developed, which contains millions of data available for every electronics repairman trough an ISDN network. Within seconds data and specifications can be obtained about almost any device. Like: components with specifications, cable frequencies, locations, suppliers, delivery periods, ZIPcodes, phone numbers, and so on.

On top of that, the system has unique error detection, using an IRIS code. That way a solution can be found for any device regardless the malfunction. At the same time one can search for the concerning scheme. All data concerning the repair can be found and printed out.

This "REPA BASE" is now operational for 2 years in the Netherlands and proved its value by an increase of costs and time of over 65%.

The system, used for "REPA BASE", was further developed and later used in Audio and Video appliances, using the basic principle to store unique data only once and add only new data. That way a number of databases were developed with different sorts of unique data. Processor systems create codes for all this data, which are finally put together in a so-called key-code. This code is offered to the workstation of the requester. On his workstation all the required data are shown on the screen as copy, pictures or schemes and can be send to the printer.

For many years people searched for ways to compress data, audio and video in order to store it on compact carriers. The compression techniques became better and better, but so far the best result still is only 45%.

The basic idea behind the development of the DAVOC system is that there should be no mechanical components, and that the carrier should be light and small. The microchip on a chipcard proved to be the right answer. Additional advantage of this carrier is the fact that one can print e.g. a logo on it.

The process of DAVOC analyses every videoframe in detail with a unique processor system. First in detail, later as a whole picture and finally as a complete clip or movie. It then creates a key-code of a few bits and stores it in the memory of the application.

That way lots of key-codes can be stored and users can make a choice of viewing a film now or (much) later. For this purpose a reader / writer is available.

In fact DAVOC did not try to improve existing systems, like VHS, but used existing techniques to develop a brand new system. Using key-codes in stead of compression.

Consequently the data is no longer stored in the way it is presented, but presented directly while the code is gradually processed. So from now on we just call it the DAVOC signal.

DAVOC is the new digital standard. It ends all traditional ways of data processing, which need enormous memory capacities. Which makes transport of data expensive and slow.

Making DAVOC the new standard offers the benefit, that applications made all over the world will have the same quality. Through telecommunications data, sound and pictures can be shown in real-time now. As the DAVOC system requires only a few bits for itself, it is now possible to store over ten hours of video on a single chipcard.

The system operates with a complete new way of digital processing in a DAVOC processor. It uses the tree basic colors red, green and blue plus an additional clearness factor. With the value of the colors, the clearness signal and the unique algorithm the processor can calculate any known color of the spectrum.

That way a perfect picture can be quaranteed, in which every detail is controlled by a reference code. No stripes, fading or other disturbance will be shown in the picture. Of every pixel only one pixel, if recognized as DDS, will be changed. And only if the pixel is different then the one before. Therefore the picture will stand like a photo on the screen. No flicker or any other disturbance will be shown. Because of the fact that the screen will be no longer refreshed 50 times a second it is not necessary have to line, grid or screen synchronization.

From every frame the processor will calculate all pixels in to a color value, the frame is build with 976 pixels in a line and 640 per frame. So 640 x 976 = 624.640,00 pixels. To speed up the process the frame is divided in to matrixes from each 16 x 16 = 256 pixels. Thus horizontal the frame contains 64 matrix blocks (lines) and vertical only 40. A complete frame contains therefore only 2560 blocks, compare with 624.640,00 pixels en enormous reduction. Every matrix block is 1/2.560 part of the frame.

The signals are analyzed and processed to a DAVOC signal and divided for further processing by the algorithm. From fixed memory (ROM) the processor compares if there is a reference and a logic value is given. When the value is not in the reference a new value will be calculated and stored in ROM memory. This is a kind of bucket memory. Through the DAVOC coding it is possible to store an enormous amount of data. (Fi. A television broadcast for several weeks and more then a dozen channels)

Trough the algorithm the correct color value of every pixel will be calculated by a processor. In the same way a value will be calculated for a frame line. After calculating 40 frame lines the value of the entire picture will be calculated. Finally all data will be processed in the DAVOC Video processor in which a single code is calculated which is stored in the RAM memory.

Sound tracks are processed directly by the DAVOC Audio processor and also stored in the RAM memory. Pictures can be viewed "life" on any monitor or TV, but can also be stored on an external carrier like a chipcard. It can then be viewed later, on any DAVOC system on this planet. The sound can be locked to any amplifier or stored in the same way.

Because DAVOC needs just a few bits for pictures, sounds and data complete programs can be stored in a small package and send all over the world. Because it only needs a small bandwidth billions of this packages can be transmitted through the ether. The only thing you need is one frequency carrier.

Just think about the possibilities this new system will offer