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i.The 7-bit ASCII code for the character ‘M’ is:

1001101

An even parity check bit is included at the start of this code (left-hand end) so that 8 bits are transmitted. What will be the transmitted code for the ASCII character ‘M’?

If this 8-bit ASCII character is transmitted using Binary phase shift keying modulation (see Section 3.3.3), sketch the transmitted waveform for the character ‘M’.

ii.If even parity check bits are used, which of the following 8-bit received ASCII codes are invalid? Give a reason for your choice.

• 10100110

• 11011111

• 00110100

Sagot :

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