Analog gain vs digital gain..!

[corgan]

I have a question about the analog gain and digital gain.
For a analog singal , said it's a sine wave, ranges from -1/+1 V.
An analog gain 3 makes the sine wave ranges from -3/+3V.

If the analog signal is digitized with sigma-delta ADC that have 1-bit output.
that means the signal become 010101001101.. (for example).
How to adjust the signal gain in digital form?

Thanks in advance!

 

[Robinenemy]

Signal gain can be adjusted in the same manner however the digital voltages are generally in the range of 4-5Volts for logic 1 and 0-2 volts for logic 0 supposed for a particular system.
So we use repeaters for Digital Signal Amplification as it is a regenerator and amplifier.
Repeater should be used before the point of maximum attenuation so that it can be used before errors are introduced.