Delta Sigma Modulator output to Decimation Filter

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Hello Everyone

The Delta Sigma Modulator has 1-bit quantizer (so 0s and 1s as output) so Do I need to take 0s and 1s as input to Decimation filter or I need to convert them to -1 and +1, got confused after some literature review, any suggestion will be highly appreciated.

Thanks in Advance.
 

If you prefer 2's complement numbers throughout the decimation filter, you may want to extend the 1-bit input to two bits representing -1 and +1. But it's not straightforward in my view. You can also interprete the filter's number format as straight binary, requesting for 0/1 input. Then convert the output to 2's complement by inverting the MSB. Using one or the other option doesn't change anything essential to the arithmetic operations inside the filter.
 
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