In 1972 Bob Kahn of ARPA , with Jim Forgie ( Lincoln Laboratory , LL) and Dave Walden ( BBN Technologies ), started the first developments in packetized speech, which would eventually lead to Voice over IP technology. In 1973, according to Lincoln Laboratory informal history, the first realtime 2400 bit/s LPC was implemented by Ed Hofstetter. In 1974 the first realtime two-way LPC packet speech communication was accomplished over the ARPANET at 3500 bit/s between Culler-Harrison and Lincoln Laboratory. In 1976 the first LPC conference took place over the ARPANET using the Network Voice Protocol , between Culler-Harrison, ISI, SRI, and LL at 3500 bit/s. And finally in 1978, B. S. Atal and Vishwanath et al. of BBN developed the first variable-rate LPC algorithm.
This scan became one of the most used images in computer history.  In a 1999 issue of IEEE Transactions on Image Processing "Lena" was used in three separate articles,  and the picture continued to appear in scientific journals throughout the beginning of the 21st century.  Lenna is so widely accepted in the image processing community that Söderberg was a guest at the 50th annual Conference of the Society for Imaging Science and Technology (IS&T) in 1997.  The use of the photo in electronic imaging has been described as "clearly one of the most important events in [its] history".  In 2015, Lena Söderberg was also guest of honor at the banquet of IEEE ICIP 2015.  After delivering a speech, she chaired the best paper award ceremony.
E E 520 Spectral Analysis of Time Series (4)
Estimation of spectral densities for single and multiple time series. Nonparametric estimation of spectral density, cross-spectral density, and coherency for stationary time series, real and complex spectrum techniques. Bispectrum. Digital filtering techniques. Aliasing, prewhitening. Choice of lag windows and data windows. Use of the fast Fourier transform. Prerequisite: one of STAT 342, STAT 390, STAT 481, STAT 509/CS&SS 509/ECON 580, or IND E 315. Offered: jointly with STAT 520.
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