Signal Detection Device, Signal Detection Method, and Method of Manufacturing Signal Detection Device

A signal detection device, comprising:

• an object signal decomposition unit that is formed by coupling a plurality of decomposition filters and that decomposes an object signal, with a coupled body of the decomposition filters being configured to make up part or the entirety of a discrete wavelet transformation tree;
• a parasitic filter coupled to a desired decomposition filter of the object signal decomposition unit, with the parasitic filter being configured such that when a real signal mother wavelet is inputted to the object signal decomposition unit and a generic discrete wavelet transformation is performed, the parasitic filter substantially reproduces and outputs the inputted real signal mother wavelet, and with the real signal mother wavelet being made up of the object signal;
• a device for inputting the object signal to the object signal decomposition unit and performing the discrete wavelet transformation by using the real signal mother wavelet;
• and
• a device for computing a wavelet instantaneous correlation on the basis of an output of the parasitic filter, wherein
• the parasitic filter has a real part and an imaginary part and is coupled to the decomposition filter so as to satisfy the conditions below:
• (1) the generic discrete wavelet transformation is performed by inputting the real signal mother wavelet to the discrete wavelet transformation tree, and an energy loss of the real signal mother wavelet in the decomposition filter to which the parasitic filter is coupled is not greater than 15 dB;
• and
• (2) computational complexity is minimized while satisfying the condition (1).