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- Tuner(s);
- Modulators and demodulators; Demultiplexer and decryptor;
- Decoders; Graphic processors; CPU and memory;
- Storage devices;
- Physical interfaces; and
- Physical characteristics A set-top box contains one or more microprocessors for running the operating system, possibly Linux or Windows CE, and for parsing the MPEG transport stream. It also includes RAM, an MPEG decoder chip, and more chips for audio decoding and processing. Further it contains a hard drive for storing recorded television broadcasts, for downloaded software, and for other applications provided by DTV service provider.