A note on cancellation path modeling signal in active noise control
Signal Processing - Signal processing in UWB communications
A delayless adaptive IFIR filterbank structure for wideband and narrowband active noise control
Signal Processing - Special section: Distributed source coding
A robust transform domain echo canceller employing a parallel filter structure
Signal Processing - Special section: Multimodal human-computer interfaces
Generalized adaptive IFIR filter bank structures
Signal Processing
Convergence analysis of a frequency domain adaptive filter with constraints on the output weights
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Integrated active noise control and noise reduction in hearing aids
IEEE Transactions on Audio, Speech, and Language Processing
Delayless subband active noise control
ICASSP'93 Proceedings of the 1993 IEEE international conference on Acoustics, speech, and signal processing: plenary, special, audio, underwater acoustics, VLSI, neural networks - Volume I
Multipoint communications with speech mixing over IP network
Computer Communications
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Some adaptive signal processing applications, such as wideband active noise control and acoustic echo cancellation, involve adaptive filters with hundreds of taps. The computational burden associated with these long adaptive filters precludes their use for many low-cost applications. In addition, adaptive filters with many taps may also suffer from slow convergence, especially if the reference signal spectrum has a large dynamic range. Subband techniques have been previously developed for adaptive filters to solve these problems. However, the conventional approach is ruled out for many applications because delay is introduced into the signal path. The paper presents a new type of subband adaptive filter architecture in which the adaptive weights are computed in subbands, but collectively transformed into an equivalent set of wideband filter coefficients. In this manner, signal path delay is avoided while retaining the computational and convergence speed advantages of subband processing. An additional benefit accrues through a significant reduction of aliasing effects. An example of the general technique is presented for a 32-subband design using a polyphase FFT implementation. For this example, the number of multiplies required are only about one-third that of a conventional full band design with zero delay, and only slightly greater than that of a conventional subband design with 16 ms delay