Set Top Boxes (STB) | Audio Video Streaming Media
TI offers comprehensive solutions for Digital Set Top Box (STB).
The TI system block diagram for STB/Streaming Media provides solutions for cable, satellite and IPTV (Internet Protocol television) Set Top Boxes. This TI system block diagram can also be used for determining solutions for standalone Streaming Media
Core subsystem includes:
- Video Interfaces - The video interfaces (output) include HDMI and Component and/or Composite video. These outputs often require high-performance video filters/amplifiers to enhance the video output from the SoC (System on Chip). Additionally these outputs often require ESD protection. Newer STB platforms provide HD (High Definition) as well as full HD at 1080p resolution and 3D.
- Audio Interfaces – The audio output from the SoC (System on Chip) is made available via the stereo output jack and headphones. With such features as high SNR (Signal-to-Noise Ratio) and analog low-pass filtering, a high-quality audio output is required as well as an audio line driver. Additionally there may be an audio SPDIF (Sony/Philips Digital Interconnect Format) input/output interface requiring a digital audio transceiver.
- USB input – A USB input to the STB requires current-limit and ESD protection
- Ethernet input – One or more Ethernet inputs may be present for providing media content over the Ethernet.
- HDD (Hard Disk Drive) Interface – for personal video recording or media storage STBs and Streaming Media devices have internal HDD, and often an interface for external HDD via SATA.
- User Interface - Allows the user to control video/audio I/O sources and communication with the system network. The user interface also includes connectivity to the remote control via an IrDA or low-power wireless device residing on the unit itself as well as on the remote control unit. Most STBs now utilize an RF remote control using RF4CE.
- Wireless Connectivity - Allows streaming audio and video transmit and receive through 802.11 interface.
- MCU - The MSP430 microcontroller can be used for managing the interface with the remote control and other user interface peripherals.
- Power Conversion - Including the AC-to-DC conversion to create the main power for the unit itself, the functional blocks in the STB require powering. The power architecture for the STB will vary by platform depending upon the core SoC (System on Chip), memory, analog front-end, analog signal chain components and interfaces used in the specific platform. High efficiency single and multi-output switching regulators and low current LDOs are required. MOSFET load switches can be used for sequencing of the power rails. TI offers all the necessary power solutions to meet stringent energy conservation mandates.