Simplified design of linear-phase prototype filters for modulated filter banks

In this paper a simplified design of linear-phase prototype filters for almost perfect reconstruction modulated filter banks will be presented. It is based on an improved frequency-sampling design where the frequency response of an easily designable Nyquist filter is shaped such that the prototype constraints will be approximately satisfied. This method does not involve any coefficient optimization and results in a computationally more efficient, faster and more stable design process, which is especially well suited for longer filters.