DIRECT SIGNAL RECOVERY FROM THRESHOLD CROSSINGS

We present a method for directly obtaining the 2M equally sampled ampl itude values of the analog input signal s(t) from the 2M locations {t( i)} where it intersects with a reference signal r(t) = A cos(2 pi f,t) . Until now, high-accuracy signal recovery in sinusoid-crossing sampli ng had been achieved only indirectly using spectral methods. The recov ery requirements are (I) \s(t)\<A and (2) W less than or equal to 2f, where W is the bandwidth of s(r). The recovery method is evaluated asa function of the accuracy in which the: crossings are located, and the sampling period T = 2M Delta, where Delta = 1/2 f(r). Its performance is also compared with other direct interpolation schemes. [S1063-651X (98)11610-0].