1seg
The ISDB-T system uses the UHF band at frequencies between 470 and 770 MHz, giving a total bandwidth 300 MHz. The bandwidth is divided into fifty channels name channels 13 through 62. Each channel is 6 MHz wide consisting of a 5.57 MHz wide signalling band and a 430 kHz guard band to limit cross channel interference. Each of these channels is further divided into 13 segments, with each with 428 kHz of bandwidth. 1 seg uses a single of these segments to carry the 1seg transport stream.
1seg, like ISDB-T uses QPSK for modulation, with 2/3 forward error correction and 1/4 guard ratio. The total datarate is 416 kbit/s.
The television system uses a H.264/MPEG-4 AVC video stream and a HE-AAC audio stream multiplexed into a MPEG-2 Transport Stream. The maximum video resolution is 320x240 pixels, with a video bitrate of between 220 and 320 kbit/s. Audio conforms to HE-AAC profile, with a bitrate of 48 to 64 kbit/s. Additional data (EPG, interactive services, etc) is transmitteed using BML and occupies the remaining 10 to 100 kbit/s of bandwidth.
Conditional access and copy control are implemented in 1seg broadcasting by the use of Broadcast Flag-like structure contained in the "Copy Control Descriptor" within the broadcast. The broadcast contents themselves are not encrypted, but the Copy Control information forces the device to encrypt stored recordings and disallows making a copy of the recording.
http://en.wikipedia.org/wiki/1seg
DVB-T
在台灣,原本地面數位電視廣播是由交通部指定採用8VSB調變的ATSC標準,但是在進行一段時間的試播之後,由於效果未達預期,各家電視公司均要求改採歐洲的DVB標準,因此交通部決定從原本的指定採用美國的ATSC,改為不強制指定,直接交由電視公司自行決定到底要採行何種標準,由各家電視公司所組成的電視學會隨即開會決定改以DVB-T為標準,並於2004年6月1日起開播15個數位電視頻道。目前播放480i標準解析度內容,於2006年底開始實驗性製播1080i節目。
http://zh.wikipedia.org/w/index.php?title=DVB-T&variant=zh-tw
480I比較爛...那DVD也不用看了..改回去看VCD好了
反正320*240比480I好
,現在問題就是在畫質不是很好,現在有的而且可以用軟體畫質大部分都不怎麼好,所以只能當作"先看",要蒐藏的就找DVDRIP或HD版的再開牧場去了
























































































