A new technique of D/A conversions

In this paper, we present a new technique to convert a digital signal to an analog signal by interpolation method. For three sample points d_i, d_i+ϒ and d_i+2T of a given digital signal, we use a part of a sine wave A sin βt to connect the sample points d_i and d_i+T so that we get an analog signal between sampling interval i and i+T. When the same process is carried out with every sample point, a perfect analog signal without switching noises can be obtained. Also, we propose a circuit to realize this technique