Bit Extraction - Simulink

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Colin Ross
Colin Ross on 21 Apr 2016
Commented: abdulrahim evli on 21 Apr 2021
I am attempting what should be a simple task. I would like to send a sine wave through a 9-bit analog-to-digital converter (ADC) and extract the output bits. Specifically I would like to extract the first 3 bits into one "channel", the middle 3 into a separate channel, and finally the last 3 into another. I will then use these bits to create a representative pulse (e.g. if the first 3 bits are 111, then I will create a pulse that takes on the value one for a specified period. If they are 000, then the pulse will have value 0.) I have attempted using the "Extract Bits" block as shown in the attached image, however I run into an overflow error. Can anyone suggest how to fix this issue or mitigate it using an alternative technique? Thank you.

Answers (1)

Nikhil Vyas
Nikhil Vyas on 25 Apr 2016
You can use the Bit Slice block instead of Extract Bits to achieve the same. Something like this:
To replicate the above example, make sure to set the datatype for the constant block to something more than 8-bit since you need 9 bits. Just saying. :)
  2 Comments
Colin Ross
Colin Ross on 26 Apr 2016
Great, thank you! This works nicely.
abdulrahim evli
abdulrahim evli on 21 Apr 2021
Can I convert to extracted bits to integer? With Bit to Integer to blok cant achieve this because extracted bits are vector

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