DSPP BLOGS

Patent name: Multi-rate Digital filter for audio sample-rate conversion US Patent No: 6,487,573 B1 This patent emphasises on method for providing sample rate conversion filter on an input stream of sampled data provided at a first rate, to produce an output stream of data at a second rate different from the first rate. The input stream of sampled data is operated on with a first low order interpolation  filter routine to produce first intermediate data  The stream of intermediate data is operated on routine, having a substantially small number of operations to calculate the to produce a second stream of intermediate data. The Second Stream of intermediate data is Operated on  routine to produce the output stream of data.

This blog presents normal discussion about the architecture of dual mode audio reconstruction filter which can be used for AC-3 and MPEG.It utilises the real FFT (Fast Fourier Transform), the efficient MPEG windowing. The digital audio which is an integral part of any video or multimedia application substantiates the need for an efficient compression algorithm due to its considerable consumption of the overall bandwidth. The MPEG audio coding algorithm is the first international standard for the compression of audio signals. Both MPEG and AC-3 make no assumptions about the source of the input signal, and they can be applied to both speech and high fidelity audio. Link:  http://ieeexplore.ieee.org/document/628679/