2007-09-03 13:08:54 · 1 answers · asked by Jeffrey James 2 in Consumer Electronics ➔ Camcorders
HD is a television definition. to be HD requires either 720 or 1080 active vertical lines and an aspect ration of 16:9. High pixel count CCDs have been around for some time for still photography so it is no stretch to apply them to video. Most upscale camcorders use 3 chips whether normal or HD format.
The normal DV system does not have sufficient compression to put the extra pixels onto tape. Television uses a much higher compression scheme call MPEG2. This trades temporal detail for spacial (pixel count) detail, by combining the information needed over several frames. This is satisfactory for pictures without a lot of motion or scene changes. Anyway the MPEG2 datastream for HD television uses no more data bandwidth than miniDV recording. So a group of manufacturers have standardized the way HD is recorded on normal miniDV tape. So that is how the HD camcorder works.
2007-09-04 07:52:31 · answer #1 · answered by lare 7 · 0⤊ 0⤋