Test pattern (broadcast)
The test pattern means examination electric wave broadcast to be made in stop time of the television transmission. Colorbar and monoscope (モノスコ) are often used for the pattern signal for the examination.
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Summary
I project test pattern ([1] that a broadcasting station name and a channel number, a call sign are often listed the picture which photographed a line reflected on top and bottom right and left mainly on the concentric circle of the bull's-eye design design radially, and the size of the pattern thing is very small) for a colorbar picture, camera adjustment called モノスコ (Monoscope) and the picture adjustment of TV on TV in stop time from middle of the night to the early morning and broadcast carrier tone (test tone of 1kHz) and record music in form to put together in it. A filler of weather camera and the CS television transmission (Nippon Television NEWS24 or TBS news bird) became often broadcasted as a substitute for test pattern after the 1990s.
In addition, until the early 2000s, the test pattern (there are 117 time signal sounds) of the NTT trunk flowed in the area except the Central Hokkaido area of Hokkaido. The test pattern of the NTT trunk did not drift after each commercial broadcasting station in Hokkaido being the whole area, and this test pattern seeing broadcast only at the time of broadcast stop after becoming it for 24 hours at the mid-2000s, and having changed a trunk to the thing of the different company before long.
The broadcast time of the test pattern was after (all or part) and (by all means) a closedown after a closedown of (noon) in the morning in the morning in time until broadcast resumption in the evening with in front of broadcast launch around 30 minutes of (noon) until broadcast was carried out all day from the television transmission dawn. It was after early-morning before broadcast launch and closedown after the broadcast launch, but I was stopping and came to often broadcast a picture and the filler picture of the weather camera all day in the after 1990s. After broadcast launch, test pattern is not broadcasted except broadcast cancellation for apparatus check overnight.
Until the end of 1970s, I was often transcribed into "test pattern" by the TV program of the newspaper, but this was because the adjustment of the television set was still necessary at home and was the part of the service for addressees. In addition, at the dawn, an electric appliance shop of the town often used the daytime test pattern for televising adjustment after the installation. In addition, the adjustment of street TV used daytime test pattern, too.
At the time of the broadcast launch, it was often broadcasted in order of "the announcements such as test pattern → broadcast launch picture (often accompanied by theme music peculiar to each station) and a call sign, frequency, the output, the telephone exchange", but there are a lot of natural exceptions. For example, the situation to attach the title of a musical composition guidance of a sound and the telop titled "a test pattern concert", and to broadcast existed. In addition, I broadcasted the performance of the district representative school of "the child eisteddfod" with an announcement introduction in Tokyo Broadcasting System (existing TBS TV) and Mainichi Broadcasting System. In Nippon Television, a jazz musical piece was used than opening of an office until the 1980s, and there was the person who checked air. I put the picture of the clock on MBS on the colorbar in Asahi Broadcasting in the early 1990s (while switching to the picture of the clock on the weather camera picture in the ABC later, and broadcasting the original piece of music of one round one minute in MBS) and broadcasted an announcement at the time.
In addition, in NET (existing Asahi National Broadcasting), a signal of 1kHz was broadcasted to a start picture with the signal of the short music box and an announcement "to broadcast test pattern for television set adjustment from now on" as whiteness five minutes ago until five minutes before broadcast launch until the 1970s. Television Kanagawa until the 1980s "whiteness → test pattern (was containing test pattern (music )→ again for long silence )→ start picture (from 9:00 to 9:01, and started with the unique format called )→ program start for from 9:01 to 9:35. Start pictures included "holiday of the dove" of Nippon Television Network and picture using the glass stick of TBS TV, picture using the illustration which I described a future city of Asahi Broadcasting in, "opening melody" (today's live performance program in the studio) of the Osaka television transmission, but each station engineering department produced these most at the time of test pattern production originally.
Broadcast immobilizes it overnight after the 21st century began (in NHK E tele and some local stations as an exception), and opportunities to see test pattern decreased, but it is early in the morning, and which broadcasting station stops broadcast for apparatus check for approximately two hours from one hour from the middle of the night and may fire test pattern during this period. When check becomes a commuter pass, I can see it on a day fixed by all means (TBS or ABC). In addition, in the Open University school, I can see it before broadcast launch every morning (ground wave, BS, SKY PerfecTV are rich).
By the terrestrial digital broadcast, ARIB colorbar may be used (ARIB colorbar may change in the diagonal direction depending on a broadcasting station).
In the test pattern of the dawn, there were the thing of the modern art-like lengthwise type (the oblong broadcast form called "イコノビジョン" was examined) that a BBC television of 1934 used in the days of examination broadcast and mere ○ and the thing which I only added one stick to below. In addition, I know that I used equipment parts of the unstable performance so that a pattern (card of the cross design) for the adjustment is inserted among programs many times using instant of the limit substitute of the scene when I look at the recording picture of the extremely mechanical TV era, and the adjustment of the apparatus which is small during the broadcast is necessary.
In addition, in about the summer of 2003 before about the autumn of 1988 and the terrestrial digital that the introduction of the clear vision (EDTV NTSC standard) was carried out began this broadcast in 3 metropolises, had been by those examination broadcast using late-night time, and have broadcasted several pieces of still images such as the expressions of a scenery photograph and the model woman of the sightseeing spot by replacement each [2]; [3]
Explanatory note
- ^ NHK institute of technology blog "TV clock of NHK"
- ^ TV radio technology
- At the time of the examination broadcast enforcement of the ^ terrestrial digital, only analog broadcasted a still image, and the digital delivered a picture of the high-definition television which I photographed for digital broadcasting
Allied item
Outside link
This article is taken from the Japanese Wikipedia Test pattern (broadcast)
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