Simulink bit operations

Asked by Raldi on 16 Dec 2011

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Hi all, I wanted to ask if from a number of bits that are represented with 1 and 0 is possible to invert the ones to -1 each lets say two bits? Thanks in advance.

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Fangjun Jiang on 17 Dec 2011

Not clear to me what do you mean by "from a number of bits" and "to invert the ones to -1 each lets say two bits". Are you saying that if you have an inputs of 10 bits, six 1s and four 0s, alternate randomly, you want to invert the first two 1s into -1?

Raldi on 13 Jan 2012

basicaly i was trying to create an ami nrz line code, i think flip flops is the only way to do that. I havent finish it yet though.

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Answer by Paulo Silva on 16 Dec 2011

[1 0]------>Gain(-1)----->[-1 0]

Use the Gain block and define that gain as -1

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Walter Roberson on 16 Dec 2011

How many bits per time sample is your generator producing? If it is one bit per time sample then perhaps use a step function that flips between -1 and 1 every two steps.

Walter Roberson on 16 Dec 2011

Ah, instead of a step function, you could perhaps use a Repeating Sequence block, as mentioned at http://www.mathworks.com/matlabcentral/answers/15874-hi-all-i-am-having-a-difficulty-in-switching-a-signal-i-need-a-switch-in-simulink-that-must-be-on

Raldi on 13 Jan 2012

I was thinking more of using a flip flop as it has memmory, The general idea was to create a simple ami-nrz line code.

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