Warped cosine-modulated filter bank design

1. The package

The package contains a Matlab implementation of the method for warped cosine-modulated filter bank (WCMFB) design presented in Vashkevich, M. Wan, W. and Petrovsky, A. Practical design of multi-channel oversampled warped cosine-modulated filter banks Proc. of IET International Communication Conference on Wireless Mobile and Computing (CCWMC-2011), pp. 44-49, Shanghai, China, 14-16 Nov., 2011.

See also: http://arxiv.org/abs/1111.0737

2. Files & functions

• main_script.m - Contains an example of practical design of warped cosine-modulated filter bank.

• warped_cmfb_opt_matlab_solver.m - function that optimizes coefficients of filter prototype using matlab solver fminunc.

• wcmfb_cost_function.m - function for calculation of value, gradient and Hessian of error function.

The purpose of other functions can be easily understood from the context.

3. Warped cosine-modulated filter bank (+design example)

3.1 Basic principle

Warped cosine-modulated filter bank structure.

3.2 Filter prototype optimization

Design example.

• 12-channel filter bank
• Sampling frequency fs= 16 kHz
• Subsampling factors Sk= [30 14 10 7 6 4 3 2 2 1 1 1]

Filter prototype optimization

Transfer function ( + aliasing transfer function)

Filter bank magnitude response

Group delay (analysis/synthesis)

4. Cite

Bibtex

@inproceedings{WCMFB_2011, 
author={M. {Vashkevich} and W. {Wan} and A. {Petrovsky}}, 
booktitle={IET International Communication Conference on Wireless Mobile and Computing (CCWMC 2011)}, 
title={Practical design of multi-channel oversampled warped cosine-modulated filter banks}, 
year={2011}, 
pages={44-49}, 
doi={10.1049/cp.2011.0844}, 
month={Nov}
}