Before revision: This type, called a "regenerative" transponder, is more complex, but has many advantages, such as lowering the signal to noise ratio as the signal is regenerated from the digital domain, and also permits selective processing of the data in the digital domain.
After revision: This type, called a "regenerative" transponder, is more complex, but has many advantages, such as improving the signal to noise ratio as the signal is regenerated from the digital domain, and also permits selective processing of the data in the digital domain.