Product code: CMS0045
The ISDB-T modulator / ISDB-TB modulator core enables rapid development of audio and visual systems using commodity free-to-air set-top-box products. Commodity products have largely been aimed at the broadcast market where the high volumes are at the demodulation end of the link. The Commsonic ISDB-T modulator allows exploitation of this technology by allowing the development of the ISDB-T modulator in low-cost FPGA or ASIC implementation. Applications include CCTV, wireless home networking, test equipment, etc.
This core is intended to provide a very efficient FPGA or ASIC implementation of all functions required to take the output from one, two or three MPEG-2 transport multiplexers and modulate it according to the ISDB-T ARIB STD-B31. The specification is fully supported by the ISDB-T modulator for 2K, 4K and 8K COFDM modes as well as hierarchical transport streams. The standard output is a baseband I/Q digital pair for direct connection to a DAC. Alternative output configurations include a low IF, direct connection to standard Analog Devices Direct Digital Synthesizers (e.g. AD9857), or Analog Device RF DACs (e.g. AD9789).
The ISDB-T modulator / ISDB-TB modulator targets SDRAM for minimum cost but also supports synchronous SRAM or internal FPGA RAM, allowing flexible implementation on a range of platforms.
Every effort has been made to keep the size of the ISDB-T modulator / ISDB-TB modulator to an absolute minimum in order to target the low-cost FPGA families, however this has not been at the expense of functionality. Synthesis directives are used wherever possible to remove blocks within the design which contain functionality not required for all applications.
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