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ajay bhutani's Questions & Answers

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What is Television Line ?

Asked by kajol devgan in TV & Radio at 4:05 PM on April 30, 2008

ajay bhutani's Answer

As a unit of measurement for resolution, "television lines" (in the plural), or TVL, refers to the maximum number of alternating black dots and intervening white spaces that can occur and be distinguished in a straight line whose length is equal to the diameter of the largest circle that fits in the screen or other area of reference. Photographers, when they refer to lines of resolution on film, count only the black lines or dots in a row in a test pattern, ignoring the intervening white spaces. The term TV Lines was introduced as an advertising gimmick to make TV, which has significantly less resolution than photographic film, seem to have more resolution than it does. In the singular, "television line" refers to the narrowest stripe where several of the same, alternating black and white, can be juxtaposed and still be distinguished.

Answered at 3:06 PM on May 01, 2008

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What is THX --

Asked by kajol devgan in TV & Radio at 4:06 PM on April 30, 2008

ajay bhutani's Answer

Trademark for theater design guidelines including seating guidelines, and surround sound technology developed by George Lucas and named after one of his films, THX1138. The purpose was to ensure that a film "looks and sounds the same way" wherever presented. Complying theaters must choose equipment from an approved list of items and rent a specific electronic crossover network (bass/treble frequency divider) for the sound system. In video, THX refers to certain video and surround sound audio encoding on laser disks and DVD's. One video test pattern.

Answered at 3:05 PM on May 01, 2008

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What is Capacitance Effect Disk ?

Asked by kajol devgan in TV & Radio at 1:45 PM on April 29, 2008

ajay bhutani's Answer

Also referred to as "RCA Selectavision" video disks. This was a 12 inch video disk and player system marketed by RCA, and now obsolete. It did not have consumer recording capability. No laser was used; the disks were grooved like (pre-CD) phonograph records, and the video signal was recorded as rising and falling ripples ("hill and dale" in older phonograph terminology). The needle, or stylus, does not follow the ripples exactly, it is not small enough or given enough pressure to. Under current technology it is impossible to make a stylus small and light enough at reasonable cost to do so. Instead, the rapidly varying tiny air space between the stylus and the groove bottom is sensed (using capacitance) to derive the video signal. According to specifications, the disks give about an hour's playing time on a side with 240 lines of horizontal resolution. One revolution of the disk corresponds to four video frames. The disk is never seen or touched in normal use. The viewer inserts the rigid jacket (caddy) into the player and then withdraws it leaving the disk behind. To unload the disk, the jacket is inserted again.

Answered at 4:00 PM on April 30, 2008

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What is CD R?

Asked by kajol devgan in TV & Radio at 1:45 PM on April 29, 2008

ajay bhutani's Answer

Refers to compact disks that can be recorded one at a time, or the equipment used to make the recordings. The so-called CD-R disk can only be recorded once; if the recorded content is no longer wanted, additional material can be recorded only on the space remaining subject to the recording method chosen, or if there is no remaining space the disk is discarded. The disks themselves are constructed differently from ordinary non-recordable CD's. Ordinary CD's are stamped like grooved records, and then the silver or gold reflective layer applied. Recordable CD's have the foil layer (gold colored) already applied, and the recording consists of "burning" the pits into an intervening layer of organic dye one at a time. "The jury is out" as far as the longevity of these disks goes; to this writer the organic content suggests possible aging problems that color film today still has. Not all CD players can play all brands of CD-R disks since the reflective surface may have a different color from the usual silver or gold.

Answered at 4:00 PM on April 30, 2008

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What is Chroma Delay ?

Asked by kajol devgan in TV & Radio at 1:46 PM on April 29, 2008

ajay bhutani's Answer

Slight horizontal shifting of color relative to the luminance details of the picture giving the appearance of a poorly done child's coloring book. It results from less than perfect circuitry or cables where literally the color subsignals take a longer or shorter time to arrive at the picture tube or other video display element. As seen it can be mistaken for convergence errors.

Answered at 4:00 PM on April 30, 2008

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Do u think Rajiv Khandelwal ki aane wali movie "Aamir" hit rahegi? Kya wo dobara TV serials mei aa payega?

Asked by Inder Jeet in TV & Radio at 1:06 PM on April 29, 2008

ajay bhutani's Answer

Rajiv Khandelwal ek achchha actor hai,usaka dobara TV serials mein dikhai dena mushkil hai!

Answered at 4:01 PM on April 30, 2008

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What is Chroma Upsampling Error?

Asked by kajol devgan in TV & Radio at 1:46 PM on April 29, 2008

ajay bhutani's Answer

Condition where, (for every four scan lines) shared color content that belongs to lines 1 and 2 is extracted with the odd interlaced field and gets applied to lines 1 and 3, and the shared color content that belongs to lines 3 and 4 is extracted with the even field and gets applied to lines 2 and 4. The result can show up as discolored streaks. Some DVD players and HDTV tuners can apply the color correctly, some hide the error by blending adjacent scan line color content, many players including some upscale models and some progressive scan models don't hide the error. Click here for more details.

Answered at 3:59 PM on April 30, 2008

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What is Moire Patterns?

Asked by kajol devgan in TV & Radio at 1:47 PM on April 29, 2008

ajay bhutani's Answer

Alternating and repeating blurred and clear areas of subject matter with uniform thin stripes or small polka dots, as seen on the screen. This occurs because the stripes or dots on the subject are spaced slightly differently from the scan lines or pixels on the screen and some of these features line up with the scan lines or pixels while others don't.

Answered at 3:57 PM on April 30, 2008

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What is Maltese Cross?

Asked by kajol devgan in TV & Radio at 1:47 PM on April 29, 2008

ajay bhutani's Answer

An alternative mechanism to the pulldown claw for advancing film one frame at a time past the projector or camera gate. It consists of a square cam with inward bowed sides and with radial slots cut in the corners, alongside a continuously rotating disk with an eccentric pin that engages the square cam by sliding in and out of the latter's slots. One revolution of the disk produces a 90 degree rotation of the square cam. To keep the square cam (and the film held by sprockets linked to the square cam) still for most of the duty cycle, between pin engagements, the related disk has attached to it a concentric circular cam with a bite taken out of it, said circular cam contacting and matching the radius of the nearest bowed side of the square cam, except when the pin is engaging the square cam.

Answered at 3:58 PM on April 30, 2008

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What is Motion Compensation ?

Asked by kajol devgan in TV & Radio at 1:47 PM on April 29, 2008

ajay bhutani's Answer

An artifical intelligence interpolation procedure to construct an intermediate image for a new intervening frame for a motion picture, showing a "moving" subject in an intermediate position between the positions shown in two original consecutive frames. For some applications (de-interlacing) just the even scan lines or just the odd scan lines might be interpolated using motion compensation given the original odd lines and the original even lines as the content of two consecutive fields.

Answered at 3:54 PM on April 30, 2008

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