Load-Balanced Implementation of a Delayless Partitioned Block Frequency-Domain Adaptive Filter
نویسندگان
چکیده
In this paper, a load balanced implementation of a delayless FxLMS algorithm for the purpose of active noise cancellation is proposed. Frequency-domain adaption algorithms using FFT's are well-known for their efficiency. However, their block-based character will lead to a delay in the order of the used block length. A hybrid adaption approach is chosen in this study to combine the advantages of frequency-and time-domain processing. To allow the usage of the proposed system on various platforms, including single-threaded embedded and real-time systems, a manual yet flexible approach of load-balancing the block-based operations is demonstrated. This successfully reduces the peak-to-average computational load and allows an optimized utilization of the available processing power.
منابع مشابه
Multidelay Adaptive Filters for Active Noise Control
There are two ways to implement frequency domain filtered x LMS (FXLMS) algorithms. The first carries out both control signal generation and control filter updating in the frequency domain, and the second involves implementation of the control filtering in the time domain and updating of the coefficients of the control filters in the frequency domain. Most active noise control literature is foc...
متن کاملLOW−RESOURCE DELAYLESS SUBBAND ADAPTIVE FILTER USING WEIGHTED OVERLAP−ADD (MonAmOR1)
A delayless structure targeted for low−resource implementation is proposed to eliminate filterbank processing delays in subband adaptive filters (SAFs). Rather than using direct IFFT or polyphase filterbanks to transform the SAFs back into the time−domain, the proposed method utilizes a weighted overlap−add (WOLA) synthesis. Low−resource real−time implementations are targeted and as such do not...
متن کاملConnecting Partitioned Frequency-Domain Filters in Parallel or in Cascade
The efficient implementation of connected filters is an important issue in signal processing. A typical example is the cascade of two filters, e.g., an adaptive filter with a time-invariant prefilter. The filtering and adaptation is carried out very efficiently in the frequency domain whenever filters with many coefficients are required. This is implemented as a block algorithm by using overlap...
متن کاملIterated partitioned block frequency-domain adaptive filtering for acoustic echo cancellation
Design and implementation of adaptive digital signal processing algorithms for broadband applications') and IWT project AUT/970517: MUSETTE ('Multimicrophone Signal Enhancement Techniques for handsfree telephony and voice controlled systems'). The scientific responsibility is assumed by its authors. Abstract For high quality acoustic echo cancellation long echoes have to be suppressed. Classica...
متن کاملThe implementation of delayless subband active noise control algorithms
Wideband active noise control systems usually have hundreds of taps for control filters and the cancellation path models, which results in high computational complexity and low convergence speed. Several active noise control algorithms based on subband adaptive filtering have been developed to reduce the computational complexity and to increase the convergence speed. The subband structure is si...
متن کامل