Inferno #04
22 июня 2003 |
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Iron - The results of the development of coders RGB - PAL / NTSC, at the end of 2002.
Results mastering encoders RGB - PAL / NTSC, at the end of 2002. (C) KSA-7G In fact, I stopped at the last version of the scheme described in the previous issue ZX-Guide - file Encod.t1. Basic setup of this scheme: 1. The brightness level of each color; 2. The level of color subcarrier; 3. The operating mode chip (under the comp); 4. Displacement waves of the fine grid, the slope. Secondary (specific) settings: 1. Correction (weakening) of the red in the NTSC (removal of pinkness white); 2. Adjusting the brightness difference between the simple and bright colors (each), the type of contrast. In general, the wonder, how could a scheme to inflate more than doubled, and this itself is not happy - but got good result. Of course, the scheme is not perfect, and it characterized the following drawbacks: 1. The complexity of setting a good, versatile white balance; 2. Inability to set completely white balance (very poorly, but painted); 3. In NTSC difference between simple and striking red less than the PAL, out of simple correcting chain; 4. Low sharpness of small details / fonts; 5. Actually, a large, cumbersome scheme. So with all this circuit became swollen, and if correct and these shortcomings (as you noticed, they are in mainly relate to the color balance - chroma), the scheme will be almost three times complicated by the number of components on the model options for incorporating MC1377P. For someone this is acceptable, and I would prefer more complex version, with an ideal balance (If you try once - for a raise, it is difficult, of course, but you can). Repeat same assembly multiple times is questionable, as gain in the number of components and quality. In general, if we consider the problem of improving the quality of any system (sound, images, frequency, etc.), we can see that as we approach the boundaries to improve the complexity of the circuits starts to grow not an example of achievable improvements in some point proves profitable to spend resources, since this leads to weak growth is doubtful quality. For example You can collect sound amplifier on a few transistors, and its parameters will be close to the HiFi-systems, but to achieve more higher quality level (twice) can be at 3-4x complication. Those who do - will understand. The above disadvantages of color based on universal encoder - with different components, mikruhah and two coding systems. Scheme can be reduced, specialized for specific conditions and particularly under one encoding - PAL or NTSC. Imbalance of colors when switching systems - is a known issue in any device. AND this is one reason specialization devices in one encoding. For example, boxes are usually available with PAL encoders, and only sometimes NTSC (NTSC - malosovmestima for old Telico). And this despite the fact that almost in any such device has input switching systems. And only in the most critical and expensive schemes do universally. The last time was in DAVE'a, watched a few demos with AMIGi on telly. AMIGA is an example of high-quality assembly and well established in the analog part picture and sound. Although not quite appropriate at the time of image parameters telly, the demo looked great, as possible in the low variant - still would, in fact on AMIGA is standard. So, DAVE me he then said (something like this, do not remember exactly): - Still, what PTsshnye cards are not stake, the Amiga very good TV picture of what I saw. I am very pleased with these words, since DAVE seen a lot of cards, and this is again confirmed the quality and elaborate system of AMIGA. In fact, if we take any console, or PTsshnuyu card - everywhere terrible ripples on tsvetokontrastnyh transitions. Of course, this is understandable coding, but the Amiga such places are much softer and look better, but a trifle more legible. For example, to a certain Amigovskoy demo TECHNOLOGY DEATH (or whatever her) is such a moment, when the screen is filled perekrestnutye line forming a square, and then this vector field begins to spin. These lines - thin and color, look great, clean, clear, without a ripple (I barely noticed - saw it? - Beat subcarrier with the elusive timing, which I Speccy often dreamed, but for a long time to get failed). Obviously, on the Amiga, a special measure to improve, because on encoding scheme to mikruhe CXA1145 stretch several signals, including the transistor. If we consider that only one signal - switching systems, as mikruha (as MC1377) is functionally complete encoder, it is can be regarded as special measures, and no doubt they are worth, and if I knew how this is done, it would be envisaged in its coder. By the way, smoothing provided me in the coder, still noticeably improve schedule. Rybinsk and Chuchkovo - looking at consoles (if that option), You can see how softer and cleaner look colorful sprites Speccy compared to the crisp set-top boxes:) This is not Amiga, of course, there is a better clarity, but like! If you look closely at the console (I have such a possibility exists), then You can see that the saturated palette there also hides the brightness, but the transition of one color and of different brightness there is very rarely used and usually less saturated. At the Spectrum, with a small palette often use the brightness transitions - to example, the shadow of bricks and other BATTY programs, with windows, so the use of adjusting the brightness difference is meaning. However, I would, without adjustment of Flowers did not refuse, if we recall first probaldel from color Speccy:) (Then there was another tune!) Present that scheme, I knew that she rather cumbersome, and in fact, waiting negative reaction from some individuals. But if you do not like so I'll say I have a very stringent evaluation criteria quality of any system, not only SPECCY, and I try to consider a position with different parties to reach pluses and minuses, and subjective perception, and if I thought that the scheme is too badly, I would have presented even more complex option. I can say (and many to be honest with me would agree) that the Speccy going not the best way, and the case not even in nedopayannyh printer interface and output buffers, RGB, and in the unit circuitry, which can be written in ROM, and at 48x, suppression interference somewhere, so you can hang the system, which is dumping her will not care until the shutdown ... or elementary sampling AY by M1 instead of the traditional IORQ with RD and WR, Kempston joystick through the jo ... th:), and much more simple and cheap. Simplify the worse impact on the Speccy, fueling ill components that require different modifications. Again same pluses: group 1 (goofy): live buggy ... fun, 2 nd: Speccy rapid brood, we have become much, we learned a lot, fixing old bugs ... Unfortunately, this approach simplifies was one of the aspects of the Soviet Union during many directions, and led to terrible neafishiruemym consequences. And no matter how strange, but the Speccy saved it underground, so how to develop its enthusiasts, and circuitry of the unit it's easy to fix this is one of the great advantages that keeps many (and me) on Speccy, those who are active, and who is not broke soldering, create, create - to act. With regard to the encoder, I wanted to get as a good picture Speccy, which is possible with the transfer coding, to ensure the possibility of correction for each color (and in practice, convinced of the need to this), consider the color characteristics and Resolution Speccy, consider the subjective perception of graphs. Sam Speccy, with its history of development, not the best candidate for the coloring. Interesting look at someone's simplified encoder and its quality - something he will relinquish my navernyaka.Moya circuit is shown in my implementation, with my stupidity (maximum - 100 Ohms at 20-second leg), I have it their own reasons ... Read previous articles ... Well, he published his scheme, look! You will need a reasonable approach and experience in tsvetosovmeschenii. For example, if you do not done this before, wonder how difficult to achieve good color balance which should be good nerves and patience. Y I got it in a completely acceptable form. I've been thinking, how can I describe the quality of white balance (after all, people want to know how good he is, and actually have it see). Do you often sit at a table in the evening (In the evening light from incandescent lamps in the conscious to look normal, state) - books, household chores? I hope you have good eyes. So can vot.Vy miss (especially with a lack of lighting) that covered the surrounding area not just a bright, yellow and even red, but if you take a good, bright photography, painting and snow, and look at her, white (snow) will be white, and like all colors are normal. In one If you like acute violation notice white balance for color characteristics of incandescent lamps, and in another case - normal picture at the same svete.Kstati if you notice a color lighting around, just look at any subject easy, long lasting, and lighting seem normal, priemlemoy.Eto due to the adaptation of imbalance lighting. Despite noticeable difference of color deviation, you quickly become accustomed to and do not notice etogo.Tak Here, the encoder imbalance is even smaller, and usually noticeable when switching the encoding, after then a matter of seconds (managed so set) eyes adjust, and white seems normal - just do not notice color variations. Of course, each a criterion of purity, someone with great deviation would be cool, but someone will patiently adjust, several attempts to give the best result. All submitted encoders were configured very successfully in the white balance, and I even sorry to send them. (people - those whom they come from, if you have a good PENTAGONy (14MGts), their intelligence - collected by the scheme, you only some will have slightly adjusted the color!) Unfortunately, the spread reflects not only the white balance, but also on own colors. So, for example, different mikruh rich purple can be more red or blue, as blue and color may be more or less greenish; primary colors usually look the same (Malorazlichny). Actually, I have not seen any Speccy with a normal RGB output, even stroke - the most successful among others, but it is a separate, classical art ... Mikruhi, except the name (in our case MC1377P), have an additional marking which may differ from similar mikruh - I called the marking code. Recently I was faced with a special spread of parameters in mikruh code XAB 9540 (I wonder what this means?), I have them There were 3 shtuki.Do that were mikruhi code XAB9517, without such abnormalities. The fact is that, having collected the next coder and tuning him, I noted an increased level of black. Encoder was designed to Denis, who still not bought a TV set, and the encoder was in my for testing. Before that I worked as the test board on which I tried different options for coders, and which rested aside from mikruhoy code XAB9517. Now about the black level. So we call reference voltage of the input signal, which corresponds to the absolute black image on the screen to set the standard brightness level. The fact is that no matter how black is not passed, with dope adding brightness, you can turn it into gray. We must also remember that the apparent brightness depends on ambient light and falls (illuminates) with the addition of lighting, read articles from the last series. Increasing the voltage on the level of Black proportional increases brightness on the screen. Mikruha itself forms black level and binds to it changes the image brightness - which is a great advantage and allows the use of various non-standard R, G, B signals, pre-balanced adjustment. But mikruhi have since spread, and then bind may differ slightly, because reference voltage is formed inside mikruhi, and change it is impossible. It should be noted that before this I never noticed variations in black level. Perhaps also because the signal from Speccy - high brightness and gradation near the black no. So, setting up another coder, I explicitly (Eyes natrenerovannye) saw the difference: black border is barely noticeable glowing. Actually, the light often border on the very top - which is a Speccy, connected to теликам.Поэкспериментировав with color screen, I blacked out and he noticed that he was not completely black (as has always been before), and slightly off. I guessed about the spread of parameters mikruh and varying levels of color, became convinced of the futility of blackened. Note that brightness level of your telly, which I adopted as a standard in this evening light, was not perfect, although I set it on different channels and gaming console SONY PlayStation (PSone) and thought normal value of 74. Subjectively, the screen was black, if the region does not exceed a quarter of black images. If a large area was black - the glow was noticeable but not conspicuous. Of course, such a noticeable scatter me disappointed, although everything else was fine, but what was my surprise when has lowered the brightness by only 1 (Lv. 73), I blew out the screen to the level of absolute black, except for thin strips - 4 upper rows of the curb! Hence, the variation was marginal and, given the imperfection of my standard and range of parameters telly, we can say that mikruha took control, as was on the verge black level, not exceeding its limit. When I learned about the second order of the Rybinsk then proceeded to build another coder. I immediately decided to send already assemblies, as these are months (4) worked successfully, and new - put to the test. Remained shadow of a doubt, and I decided to dispel. I brought a black screen, which is slightly shone with brightness level telly 74, turned off the encoder (special external switch) and changed mikruhu by inserting a test board mikruhu XAB9517. I have included coder - the screen was black as night, was add brightness telly, and the 77 poorly lighted screen. Then I brought up the color. I was struck by an almost perfect resemblance mikruh for white balance. I switched the encoding and put back mikruhu code XAB9540, color is not much different - hardly noticeable. For the sake of interest I tried the other two mikruhi with the same code: the black level of They had a normal (black screen does not light), but more than XAB9517, but the balance white slightly, but noticeably different. When I have brought color, saw an even more raznitsu.Purpurny seemed enough red (shifted towards the blue) and a greenish blue, yellow was more orange. I realized that I have to tinker with the configuration, and therefore put the old mikruhu, under which all set up. When I collected the next coder and became tune to another mikruhe XAB9540, found that in normal white balance optimal for both PAL and NTSC, the color noticeably different from previous coders, in fact, as before - during the test. Especially obvious difference is blue, which PAL is too light (it's usually for PAL systems and consoles, and television), and NTSC too green, that is, greenish. You can reduce the difference, but noticeable if the white balance is disturbed. In the end, I decided to send in Rybinsk has already tested the scheme on first mikruhe XAB9540, despite the ultimate black level - very normal in practice (the difference of brightness adjustment when switching from TV to the Speccy and back will not exceed 5i clicks on the remote Control even the worst interpolated), in that mikruhi smaller imbalance when switching coding system. Later I remembered that I had mikruha with such notable scatter (as two Other mikruhi XAB9540). When switching systems, the color blue always varies considerably, but some mikruhah it is less green to NTSC, while others - more. I almost forgot that at the last coder purple color was more red, I for myself this noted, and now, when faced with the opposite deviation, the difference seemed to I'm too big. Eyes accustomed to the previous scheme, and for them this imbalance is obvious. Adaptability of view. In general, the adaptability of our vision potryasaet.Vot an excellent example - sure, familiar to many of you. Before that I had telly LG Golden Eye with a simple screen diagonal 51 cm (20 inches). I have not tried it on my encoder (and he has displayed on the screen coded system, we should like to try something). It is almost the same telly, but FLATRON - flat screen diagonal of 54 (21). So, when I first looked, I Depressed, he seemed, at that bulge on the old telly was weak and almost nezametnoy.Bukvalno week I concavity have not noticed, but how you look at the old telly ... a ball-kind ... not even imagined before! But the joke - Monitors (probably because the screen is much smaller). When I later came to DAVEu I It seemed that someone was not until the end thrust globe in his monitor. In general, the vision to such an effect is relatively pereadaptiruetsya bystro.Eto depends on various factors and can vary from several minutes - up to several chasov.Dlya complete sense enough to look at regular telly for half an hour, and look at the other. Well, and adaptation to SCROLL'am all probably oschuschali.Chem speed limit, more desire to read, and the longer the success of this desire, the more floating walls, objects and other things in his eyes from the screen. It is desirable for it to to scroll the texture was floating. I remember, like the one a multi-boot'e, which I like to use a system drive (now uses a fast, easy), run up line with the words ... uh ... type ... remembered: HELLO HELLO BOYS GIRLS ... But after he was observed with a funny texture wallpaper. After trying different mikruhi assembled in one coder, and then they are the same in the other, to eliminate the possibility of different assemblies, I convinced of the small scatter of their parameters, it is quite acceptable. My vision is strongly accustomed to one of the deviations and explicitly noted the other (the former long time - a year ago - and forgotten). After playing in NETWALK, and after watching "Cat" species (great game, great pictures, though, the two did not understand), I surprised to note an excellent image, which is fine with me, switched system, everything seems fine, white balance, normal, almost unchanged during switching. The time was about 1.00 am and voltage lighting has improved, your eyes are accustomed to, ie Light should be more white. The conclusion - which I did in previous articles: Do not try to immediately adjust the color balance of good coder, and his eyes get used to the colors, keenly noting any abnormalities, and is ideally set nelzya.Luchshe INCL. dynamic, colorful demo, or game play for half an hour, distracted, and when again Bring out the band of colors, or just above Menu Speccy, the image seems quite good, and deviations - minor. Especially in games and demos pictures look great, very nice. And do not forget about multitsveta - awesome look (Play NETWALK). Statistics mikruh. Technical result of the use of mikruh MC1377P the following: none of this mikruha time, not out of order (or did I do not know), from two faulty - one allegedly punched statics, works in Chuchkovo on the corrected to reflect this coder and a second, I accidentally burnt for the closure, while lying idle, and requires special schemes for perfectly normal work; all mikruhi easily and quickly configure the working mode sootvetstvoyuschey tuning, and no problems with different quartz (at 4.43 MHz frequency) was not; there are deviations of the parameters for different mikruh but not strong, though noticeable (on the color tables, different pictures and sprites looks great, ie varied schedule - looks great and is not critical to spread before the color chart). Interestingly, when testing all mikruh one assembled and tuned coder picture appeared once in the normal color, without disruption, and is normally switched charset t.e.osnovnye technical parameters for different mikruh normal. It's all just in case anyone doubts the acquisition mikruh and can not be solved therefore, build an encoder. Of course, ideally I Encoders should try on different telly, and different components. However, given successful connection scheme in Rybinsk and Chuchkovo, I think, no problems, although their versions of devices unknown to me. In case of someone something breaks, please, for the sake of statistics, at least. Actually, I tried encoder with quartz 3.58MGts. The fact that the ideal frequency noise intensity should be either significantly different from the sub-carrier, or be very close to it. Then the beat frequency of small grid will be less visible or not too often - an irritant (to close frequencies). Therefore, the ratio of fine grid Speccy (3.5MGts) to the encoder is not very 4.43MGts subjective well as with the 3.58 MHz - just close. I tried this with quartz, and the picture seemed to me a pure white. Probably because the potential interference Speccy itself less transmitted over a low frequency quartz, but also because of the close frequencies too! For example, the background of 50 Hz over visible on the Speccy with a low frame rate (Pentagon with 14MGts), in comparison with systems more than the standard rate, however, I have in good supply and line filter image otlichnaya.S quartz 3.58MGts I found a cleaner image, and wavelength of the fine grid more low (I'm their obviously do not remember, though, was something ...). But fine detail is less saturated (approximately one color on two points) for obvious reasons. I was also disappointed that my telly is not supports NTSC with such frequency (With picture when switching some time held, and then becomes color - one color). Maybe for someone an alternative, but I chose another quartz (As most probably different components). Flock oblomingo. During the assembly revealed a weak spot. Most weak spot - it's Potentiometers, very simple and cheap, poor assembly. K yet, there is no alternative, do not want to Healthy Cities. The new encoder two in a row threw - solder to red, fully manifested at work. Had better were more expensive and better. Just remembered a problem with Conder, payal that the new encoders. There Conder Polar - and modern, imported or once I have had no problems, and simple capacitors - not diametrically opposed, here and with our almost no problems. Modern nonpolar low-voltage capacitors come in two flavors: creamy plates and yellow cakes. Plates painted with unsaturated, light yellow, rather light brown ie type of cream, color. On them in large written, is more emphasized, par. Externally, apart from asymmetry - micro UFOs, little NEletayushaya plate. Above and below the disc depart thin soft vyvody.Nominal from picofarads to 0.1mkF (And maybe more). This is great for Conder based ceramics (probably). They are not afraid overheating during long soldering, they have a solid body, allowing a close bend - in general, COOL. Pellets have a saturated bright yellow with small numbers and harsh conclusions. They come in different shapes and size (more than drip or broad flat), possibly at different scale voltage, the nominal value is usually from 0.1 to 5 uF - NOT POLAR. Small, but expensive. Conclusions from They usually come out in the plane of the pellet with one edge parallel. Inside the pellet (Probably) a simple ceramic crystal, with opayannymi (for deductions) edges. Such crystals can be seen on some imported boards. From cakes need to be careful not to bend the conclusions close to body and long gret.Hotya their bright yellow material is very durable and I have a problem with them no - too COOL. But there are light blue plates with stiff legs (pF typical) - rotten collected. Afraid of overheating - otpaivayutsya feet from the building, to be very careful soldering. There is still dark, deep-blue pellets (0. 1mkF), it sucks! Generally, it is a typical crystal with pripayanymi legs, but composition of casting such a lousy, it's easy overheating during soldering, and the legs begin to otpaivatsya from the crystal. Use such Conder, of course, you can even overheat if the leg is not completely unsolder (Conder himself afraid of not overheating, the capacity good), but it is better not to buy more of them, excluding products of low quality. Also, I oblamalsya with switches. Small, cheap, 3 feet - as usual, Overall, got a bunch of (thought-current weak voltage - therefore cheap, and for switching PAL / NTSC all possible). When soldering the plastic spout became warp and Switch slomalsya.Ochen fears of overheating (soldering can still suffers hand). I get the hand - switching in one direction, payayu the other, then vice versa. Cheap vobschem. I will not buy more, more expensive take, with a long nose. Forgot to mention - So I soldered to the board body, legs to solder not scary. Scatter components. In the encoder is better to use imported Polar Conder (especially at the entrance of colors, or tails on the curb will be from the screen color). Conder voltage 16 V or more. Although the encoder will work with the details different from those within the denomination (+ / - 10%, except for quartz!), It is desirable to use these values, especially in the chain of quartz delay lines and transformers. Germanium transistor necessarily, the high can be P416 or GT311. Silicon, of course, will work, but the balance of red noticeably worse. When using the trimmer, less food - a common solder to leg connected to the trim screw, then tweak with the touch of a screwdriver not throw the result. Plans for the coders. Sometimes eerie want to collect the encoder system SECAM.V such cases, I think of different options schemes presented in the literature, Speccy, and encoder-modulator to its first - 48 Speccy. None of the scheme have not like it (from my encoder - due to the instability and the caudate, and other cumbersome and discrete in color). Then begin to develop our scheme based on the universality of - well, like, input R, G, B - Analogue Nutrition stability (5V!), and finally scheme grows and swells ... The most difficult - A good generator, however, electronic switch matrix and signal too difficult for universality. In general, normal - our scheme has not yet developed. Tried once their polusleplenye encoders with generators of different types - working lousy, however, the signals are bad IDENTIFICATION passed ... Heavily involved in the scheme will not be easy. Maybe it'll do. As for my encoders on MC1377P, Maybe try to make a delay line or get a suitable, perhaps, will be better schedule. Really try to synchronize quartz from the encoder clock Speccy, reactive chains. This is a serious and very promising task. If you get imperceptibly zasinhronit color subcarrier can be improved clarity of small details (FONT) and subtract the level of the subcarrier - along with the ripples on the transitions. Absolutely real it can be done at several counters clock, which through the electronic key will be served on the momentum of quartz, like dropping it to its original state, every five frames, to example. But imagine what a complication of an encoder? On details of cheap, but very cumbersome, and may, at the Amiga way it is done, and maybe that's all there inside mikruhi CXA 1145, and only want to install frame synchronization of the external, simple RC chain? Therefore I have very big plans for the mikruhu CXA1145, which has long been gathering dust since its order. Again, where would I find a template including this mikruhi. By all sorts of options left, almost blindly, trying to build did not want. Here I think, have to DAVE'u go, the scheme with the Amiga had remained (I hope), but I can trust them, although neither of which describe the legs mikruhi and its signal can be no question. Or get lucky and rolled a very old (easy assembly), and even dead SEGA (and therefore free), then it will be on what to unwind. If appropriate, the scheme will be more expensive, and not easier, certainly (at this mikruhi on four feet longer, while hull average thickness between the narrow and wide, we must cut the socket - there are not seen). But if you still get, the picture I hope will be better for the balance of color, otherwise, renounce this mikruhi. What is questionable, and do not want to - it's probably the best encoder among others. Too much to do, and rubbish, with which must be razobratsya.V soon Draw a diagram on a dead printer ELECTRONICS MS6313 (by the way, can those who have to him flash, and then draw a diagram - and he Healthy (veroyatn. 18%), and waste time to lose?). After the printer look, what to do, many Speccy fix is necessary, in order to become complete, all typically-Spektrumskie. How to take encoders, was carefully analyze various channels, our channels are rarely PAL encoding, and I already sporting interest - to be determined image encoding. It is very difficult, I relatively often wrong, but experience clearly dialed and recognized species interference kodirovaniya.I already seen many times forced smoothing Definition TV (Clothes, buildings). Well, that's all for today ... I would like to convey greetings to all, but all, alas, not list ... and I will not! that others do not resented. In general, all the best for those who was, to those who have and those who will be there. Mention of two friends who were previously not formally represented, and without which the coders would be in the darkness of misinformation: Thanks to Andrew Bateevu, Andrew Meleshkin for a template and the data on MC1377P.
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В этот день... 21 November