HD-3688A HD-3688A is a HD digital terrestrial receiver, working by the STi7100 solution. It could be change the SD and HD output in the same time all the High Definition terrestrial TV program channel. Marshal including: HDMI,YPbpr,Dolby AC3 these video and audio output ports. It's the best way provide you the high definition TV interface and the fantastic circle dimensional sound. Function and characteristic: Adopt the international advanced STi7100 solution Dolby 5.1 channel or PCM digital audio output Fully DMB-TH MPEG-2 compliant Coax SPDIF output Multi Bandwidth ion: 6M 7M & 8M Aspect ratio: 4:3/16:9 H.264 MEPG-4 MEPG-2 HD/SD decoding (MP@HL/ML) Supporting electron program brows EPG Conversion between SD programs and HD programs High speed USB2.0 port Supporting Dolby AC-3 or MPEG-1 audio decoding Software upgrade via Rs232 Supports 64QAM, 16QAM and QPSK (4QAM) sub-carriers Channel and Program editor Marshalling HDMI output ports Parental guidance YPbPr Output: 1080i/720p/576p AC90~260V or DC12V ( ive) input