2.18- Design a PCM system that could be used to transmit the video portion of black-and-white television signal. The video signal contains frequencies up to 4 MHz. A study of viewers has indicated that at least 70 gray-scale levels are required for a pleasing picture. 2.52- calculate the correlation for the Barker code of length seven.

2.18- Design a PCM system that could be used to transmit the video portion of black-and-white television signal. The video signal contains frequencies up to 4 MHz. A study of viewers has indicated that at least 70 gray-scale levels are required for a pleasing picture.
2.52- calculate the correlation for the Barker code of length seven.
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