|Dimensions||1525μm x 1525μm|
|Power||80 mW, 140MHz|
Digital VLSI ASIC design and testing in 180nm CMOS. Implementation of audio restoration employing an iterative thresholding algorithm using Approximate Message-passing (AMP). This algorithm from the field of Compressed Sensing is adapted to remove impulsive noise, such as clicks and pops, from a stream of generic 16-bit audio samples by exploiting the sparsity of audio signals in the frequency domain and of clicks in time domain. The main unit of the implemented AMP architecture performs a fast 512-point Discrete Cosine Transformation and its inverse based upon an efficient complex-valued 256-point Fast Fourier Transform. The design can achieve sample rates above 200kHz at a maximum clock frequency of over 140MHz consuming around 80mW of power.
There is a funny bug with this chip. On the bottom right corner, the date is mistakenly written as 2011, where as when the chip was taped out, it was January 2012.