TD-SCDMA solution
CMMB+the cellular phone television of the TD-SCDMA solution
1, the cellular phone television related standard all saydvb t tuners
The cellular phone television is an IP television, the another door independent signal out of the wired net television, satellite television and ground broadcasting television to receive mode, is adapt to a cellular phone consumer of video frequency new hand segment.Currently, the cellular phone television business carries out a way to mainly have 2 kinds:1)make use of beehive ambulation network realization, 2)make use of a broadcasting method realization.(include satellite broadcasting and ground to broadcast 2 kinds)Majority of cellular phones television business that the ambulation operators release depend on an existing beehive network realization currently.The cellular phone television business(have already changed name to a cellular phone video frequency currently) of the Chinese ambulation is according to GPRS and TD-SCDMA network, the Chinese telecommunication then depends on its CDMA1 X and CDMA2000 network.This kind of cellular phone television business is actually an exploitation to flow a medium technique, the handle knob machine television is a kind of data business to be released.No matter is GPRS a cellular phone still a CDMA1 X cellular phone, all need to be installed in having the cellular phone terminal of operate system homologous of broadcast software, but the television program corresponding is then organized by the operator or the related SP and provides.LED lights manufacturer
Know to all the 3 Gs international standard to include WCDMA, CDMA2000 and TD-SCDMA.The WCDMA cellular phone television standard has already made sure for MBMS
(MultimediaBroadcast|MulticastService).The TD-MBMS technique project hands in a 3 GPPs in May, 2007, already drive accept for the country a border standard, that project is what exhibition Xun wait manufacturer put forward first and get in interest etc. TD industry chain the manufacturer’s support and perfect, this means TD-SCDMA standard adoption MBMS have already become settled situation.CDMA2000 adoption makes MCBCS(MulticastBroadcastServices) of 3 GPP2 definitions as its cellular phone television standard.dvb t mpeg4
Currently, mainly have DVB-H of Europe and DMB(DigitalMultimediaBroadcasting, including T-DMB in the ground and the satellite S-DMB) of Korea,MediaFLO of the United States and ISDB-T of Japan according to the cellular phone number television standard abroad of broadcasting method.DVB-H(DigitalVideoBroadcastingHandheld) is the number television standard organization(DVB) of Europe for pass the ground number broadcasting network to then hold|holdses terminal to provide the multi-media business draws up of deliver standard.It is the number television standard(DVB-T) of Europe to expand an application to should be standard.Compared with DVB-T, the DVB-H terminal has achievement consume much lower, the ambulation receives with anti- interference function stronger characteristics, therefore should standard etc. for being applicable to ambulation telephone, hand to hold a calculator Be small scaled to then hold an equipments to receive signal through number television broadcast network in the ground.Can also say, the DVB-H standard relies on currently DVB-T to deliver system and pass to increase certain additional function and improvement technique to make the equipments able to stabilize ground to receive a broadcasting television signal.Japan then broadcasts a way in its microwave number television ISDB-T standard under, drew up a single wave band to broadcast norm.Though these two kinds of functions of technical specifications are equal, they still have very distinct.The single wave band broadcasting is to partition, narrow frequency bandwidth, but DVB-H then adopt score word multimedia the bandwidth of the broadcasting, send out the data of each channel by pulse.Under the general circumstance, in addition to accepting the data of needing the channel, the tuner electric circuit all is placed in close appearance in other time, therefore can effectively reduce to consume an electricity.dvb-t receivers
DMB(DigitalMultimediaBroadcasting) is broadcasts DAB(DigitalAudioBroadcasting) in the number audio frequency foundation up develop of technique.The DMB technique is divided into 2 kinds:A kind of is T-DMB(number multimedia broadcasting in ground), another is a S-DMB(the satellite number multimedia broadcasting).This standard speaks from the strict meaning and still is regarded as the international standard of Europe.This technique the establishment develops at the European manufacturer of card in 147 number audio frequency broadcasting(DAB) system of foundation up, after doing a certain modification can to cellular phone and PDA and then hold television etc. to hold an equipments to broadcast an air number to see an audio frequency programoverseas risk
