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Words near each other
・ IRD
・ IRD asset
・ IRDA
・ IRDC
・ Irdi Rapaj
・ Irdin Manha Formation
・ Irdinmanhan
・ Irdjen
・ Irdning
・ IRDO
・ IRDP
・ Irdyn
・ Irdynivka
・ Ire
・ Ire (album)
IRE (unit)
・ Ire Works
・ Ireanc River
・ Ireby
・ Ireby and Uldale
・ Ireby Fell Cavern
・ Ireby Old Church
・ Ireby, Cumbria
・ Ireby, Lancashire
・ Irechek (village)
・ IRecover
・ IRecover treatment centers
・ Irecê
・ Iredale
・ Iredalea


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IRE (unit) : ウィキペディア英語版
IRE (unit)

An IRE is a unit used in the measurement of composite video signals. Its name is derived from the initials of the Institute of Radio Engineers.
A value of 100 IRE was originally defined to be the range from black to white in a video signal. A value of 0 IRE corresponds to the voltage value of the signal during the blanking period. The sync pulse is normally 40 IRE below this 0 IRE value, so the total range covered from peak to trough of an all white signal would be 140 IRE.
The reason IRE is a relative measurement (percent) is because a video signal may be any amplitude. This unit is used in the ITU-R BT.470 which defines PAL, NTSC and SECAM.〔(【引用サイトリンク】title=BT.470 : Conventional analogue television systems )
==References==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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