Provided is an alkali-free glass, which is substantially free of alkali metal oxides, and has a strain point of more than 680\xb0 C. One exemplary method may be implemented in a processor in a storage network. The microphone assembly further includes a metal screen coupled to the case over the printed circuit board for shielding the microphone from electromagnetic interference. The method includes, based on the first and second output signals, producing the DCLK and BCLK signals, with the DCLK signal being delayed with respect to the BCLK signal less than approximately 0. For multiple bit Poisson distribution error signals the PRBS generator and comparator combination may be replicated m times, or a single PRBS generator may be used and a unique independent subset of the PRBS sequence is applied to each of the multiple comparators. The processing circuit generates a first processing result and a second processing result by processing a first horizontal line group of a first frame and a second horizontal line group of a second frame preceding the first frame, respectively.