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Video and audio were uncompressed, and required up to 36 mhz per transmission. Video was broadcasted using a modified D2-MAC encoder. Standard resolution was 1250 (1152) lines/50 frames in aspect ratio.
HD-MAC could be decoded by a standard D2-MAC receivers, but in that mode only 625 (576) lines were available. In order to decode the signal in full resolution, an specific HD-MAC tuner was needed.
In the 1992 Summer Olympics, an experimental HD-MAC broadcasting took place. 100 HD-MAC receivers (in that time, retroprojectors ) in Europe were used to test the capabilities of the standard. This project was financed by the EEC. The PAL-converted signal was used by regular broadcasters such as SWR, BR, BR, 3Sat ... .