Acousto-optic processors for real-time generation of time-frequency representations.
Acousto-optic processors for calculating different two-dimensional (2-D) time-frequency representations for one dimensional temporal signals in real time are described. The various 2-D representations discussed in the literature, such as the Wigner distribution and the ambiguity function, are shown to be obtainable through minor variations in an acousto-optic processor consisting of two Bragg cells in a parallel configuration. Also obtained and discussed are two new time-frequency representations that, for amplitude-modulated signals, correspond to mean-frequency-selective correlation and Doppler-frequency-selective convolution. Experimental results are presented to highlight the special features of the different time-frequency representation.
Athale
R A
RA
Lee
J N
JN
Robinson
E L
EL
Szu
H H
HH