  Recently, it has been shown that the Weinberg's formula for soft graviton
production is essentially a Fourier transformation of the formula for
gravitational memory which provides an effective way to understand how the
classical calculation arises as a limiting case of the quantum result. In this
note, we propose a general framework that connects the soft theorems to the
radiation fields obtained from classical computation for different theories in
even dimensions. We show that the latter is nothing but Fourier transformation
of the former. The memory formulas can be derived from radiation fields
explicitly.
