Abstract: An engine for processing functions used in audio algorithms. The engine runs in parallel with a digital signal processor (DSP) in an audio chip to increase performance for that chip. Functions performed by the engine include biquad filtering and inverse discrete cosine transform (IDCT) including pre-multiplication, inverse Fast Fourier transform (IFFT), and post-multiplication, which would otherwise be performed by the DSP. The DSP is therefore free to perform other functions demanded by the chip. Resources in the engine are processed in a pipeline structure and are thus highly utilized. Data are stored in a predefined order to increase efficiency.

Abstract: A detector provides outputs that are compared to threshold values to determine a valid phase change. Additional discrimination logic may be added to speed the detection process and reduce false detections. Identified patterns relating to NEXT/FEXT frame boundaries allow for NEXT/FEXT frame alignment. Identified patterns for NEXT/FEXT frames in a hyperframe allow for hyperframe alignment.

Abstract: Techniques for identifying an improved bitloading assignment for a multicarrier communication channel are provided. Generally, bit loadings of the sub-channels are equalized (either completely or partially) by selectively decrementing high bitload sub-channels until a desired degree of equalization between the sub-channel bit loadings is achieved. By reducing the bit loading of high bitload sub-channels relative to other sub-channels, the communication channel is effectively desensitized to non-stationary noise.