A new s.a.w. time-inversion system is described. It requires fewer chirp-filter elements than those required with the common method of cascading two Fourier or Fresnel transformations. This new method is based on the fact that the Fourier transform of a linear f.m. signal whose envelope is modulated by a given time function has (approximately) the time-inverted function as its amplitude. Theoretical discussion and some experimental results are included.
|Number of pages||2|
|State||Published - 29 Mar 1979|
- Signal processing
- Surface-acoustic-wave devices