Patent ID: 8780955
Filing Date: 2014-07-15
Classification: G01S,H04B

Abstract:
1. A signal processing apparatus which calculates a correlation value between an input analog signal and a given digital code, the signal processing apparatus comprising: a noise adder which adds a noise signal to the analog signal; a comparator which compares, synchronously with a clock signal having a first period, a magnitude of the analog signal added with the noise signal with a magnitude of a given voltage; a multiplier which receives an input of a comparison result from the comparator and the given digital code and calculates, synchronously with the clock signal, an exclusive OR between the comparison result and the given digital code; and a counter which accumulates calculation results from the multiplier over a second period in a time series, and calculates, as the correlation value, a difference between an accumulation result and one-half of a quotient of the second period and the first period.