mittee) video frequency response. Since this feature is usually DVB (Digital Video Broadcast) irritating over the long term, it should be defeated or properly adjusted. For the film look many video enthu- ARIB (Association of Radio Industries and siasts strive for, the frequency response should be as flat Businesses) as possible. IPTV (including DVB and ARIB over IP) Another issue is the output levels of the analog video Open digital cable standards, such as OpenCable signals. Although it is easy to generate very accurate video Proprietary digital cable standards levels, they vary considerably. Reviews now point out this Proprietary digital satellite standards issue since switching between sources may mean chang- Originally based on MPEG-2 video and Dolby R Digital or ing brightness or black levels, defeating any television MPEG audio, they now support new advanced audio and calibration or personal adjustments that may have been video standards, such as MPEG-4 HE-AAC audio, done by the user. Dolby Digital Plus audio, MPEG-4.10 (H.264) video, and SMPTE 421M (VC-1) video. Figure 7.1-6 is a simplified block diagram for a digital Digital media adapters television set-top box, showing the common audio and video processing blocks. It is used to receive digital Digital media adapters connect to a home network for television broadcasts, from either terrestrial (over-the- playing content (music, video, pictures, and SO on) re- air), cable, or satellite. A digital television may include siding on a PC or media server. These small, low-cost this circuitry inside the television. boxes enable content to be easily enjoyed on any or all Many set-top boxes now include two tuners and dig- televisions in the home. Many support optional wireless ital video recorder (DVR) capability. This enables re- networking, simplifying installation. cording one program onto an internal HDD while Figure 7.1-5 is a simplified block diagram for a basic watching another. Two tuners are also common in digital digital media adapter, showing the commo