A Low-Delay Filter Bank for Audio Coding with Reduced Pre-Echoes
Gerald Schuller · Journal of the Audio Engineering Society · 1995
A low delay filter bank for audio coding is presented. The low delay allows to reduce the length of pre-echoes generated by quantization errors. The structure provides perfect reconstruction and a system delay which can be pre-specified independent of the filter length. A robust algorithm for the design of such filter banks is developed. In an explained example for audio coding the length of the pre-echo is reduced to about one third for a filter bank with 128 equally spaced bands when compared to known filter structures.