ICASSP 2011 introduced a new type of event in its technical program, namely "Trends in Signal Processing". In total, all 13 sessions were held during lunch time from Wednesday till Friday (May 25 to May 27, 2011), and each lasted 30 minutes. In each session, a Technical Committee of the Signal Processing Society featured a few expert summaries that highlighted the most significant advances and upcoming trends within the TC's area over the past year. These “Trends in Signal Processing” sessions were well attended by enthusiastic audiences. The expert summaries presented in these “Trends in Signal Processing” sessions will later be published in IEEE Signal Processing Magazine.