Combo Device of GPS + DVB T

DVB-T GPS Combo: GPS-WS-6700

Specifications of WS 6700 TVB-T + GPS Combo

Built-in DVB-T Reception
GPS Navigation
In-built 30GB Memory(40G or 60G)
picture-previewing Format: JPEG,BMP, PNG
word file previewing format: TXT
MP3: Format (MP3,wma), Music & Lrc Synchronous Display
Multi-language
Availability Of Multi-Interface
Built-in Local Media Playing
Support Formatted File: MP4, AVI, MPG,MPEG
Support video decoding format:
MPEG-1, MPEG-2 MP@ML( Main-Profile @ Main-Level )，H.264，
MPEG-4 SP/ASP , Resolution up to 720x576 / 30fps
Support Aduio coding Format:
MPEG layer I/II & MP3, WMA, AAC, AAC Plus, Dolby Digital (AC-3)
Audio sampling rates of 32, 44.1, 48, 96kHz

TV and GPS Combo: GPS-WS-6800

The WS 6800 Combo of TV and GPS:

Adopt VIA VT8430 chipset supportWINCE5.0 & Linux operation system
DVB-T &DTMB&CMMB standard
GPS navigation using Careland map software
4.3 inch LCD screen
full-band frequency search&play for digital channels
video&audio program play from local falsh card(format:mp3,MPEG-1,MPEG-2,MPEG-4,AVI,H.264)
image-viewing&E-book
Support FM transmission

Definition of DVB-T

DVB-T is an abbreviation for Digital Video Broadcasting – Terrestrial; it is the DVB European-based consortium standard for the broadcast transmission of digital terrestrial television. This system transmits compressed digital audio, video and other data in an MPEG transport stream, using OFDM modulation with concatenated channel coding (i.e. COFDM).

Rather than carrying the data on a single radio frequency carrier, OFDM works by splitting the digital data stream into a large number of slower digital streams, each of which digitally modulate a set of closely spaced adjacent carrier frequencies. In the case of DVB-T, there are two choices for the number of carriers known as 2K or 8K. These are actually 1705 or 6817 carriers that are approximately 4 kHz or 1 kHz apart, depending on whether it's a transmission channel of 8, 7, or 6 MHz.

DVB-T also offers many other transmission choices of digital modulation (QPSK, 16QAM, 64QAM) and Code rate --forward error correction (FEC). This allows broadcasters to trade off payload data capacity versus improved reliability of reception in different reception conditions.

DVB-T as a digital transmission delivers data in a series of discrete blocks at the clock or symbol rate. DVB-T includes a "Guard Interval" feature where the receiver ignores the data for a short period around the time when the data changes. Within limits, this allows for the receiver to ignore the effects of multipath reception.

Within a geographical area, use of the guard interval also allows single-frequency network (SFN) operation, where two or more transmitters carrying the same transport stream of services can operate on the same RF channel frequency. In such cases the signals from each transmitter in the SFN needs to be accurately time-aligned, which is usually done by a sync signal in the stream and GPS timing at each transmission point. This allows the overlap region between transmitters, sometimes called the 'mush zone', to be geographically shifted away from population centers.

DVB-T has been adopted or proposed for digital television broadcasting by many countries (see map), using mainly UHF 8 MHz channels, but also 7 MHz (VHF and UHF in Australia), and 6 MHz in Taiwan. Examples include the UK's Freeview.

The DVB-T Standard is published as EN 300 744, Framing structure, channel coding and modulation for digital terrestrial television. This is available from the ETSI website, as is ETSI TS 101 154, Specification for the use of Video and Audio Coding in Broadcasting Applications based on the MPEG-2 Transport Stream, which gives details of the DVB use of source coding methods for MPEG-2 and, more recently, H.264/MPEG-4 AVC as well as audio encoding systems. Many counties that have adopted DVB-T have published standards for their implementation. These include the DTG in the UK, the DGTVi D-Book in Italy,Nordig and Standards Australia AS 4599 (transmission) and AS 4933 (DTV receivers).

DVB-T has been further developed into newer standards such as DVB-H (Handheld), now in operation, and DVB-T2, which is in the finalstages of development in 2008.

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China manufacturer, supplier of DVB-T consumer electronics, DVB GPS Combo, GPS with DVB TV function in CHina.