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FILTERBANK STRUCTURE AND METHOD FOR FILTERING AND SEPARATING AN INFORMATION SIGNAL INTO DIFFERENT BANDS, PARTICULARLY FOR AUDIO SIGNALS IN HEARING AIDS
FILTERBANK STRUCTURE AND METHOD FOR FILTERING AND SEPARATING AN INFORMATION SIGNAL INTO DIFFERENT BANDS, PARTICULARLY FOR AUDIO SIGNALS IN HEARING AIDS
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机译:用于将信息信号过滤和分离为不同频段的过滤银行结构和方法,尤其是用于听觉艾滋病中的音频信号
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摘要
A filterbank structure is provided which provides a flexible compromise between the conflicting goals of processing delay, filter sharpness, memory usage and band interaction. The filterbank has an adjustable number of bands and a stacking which provides for a selectable shift of band frequencies to one of two discrete sets of center frequencies. The width of the bands and hence the number of the bands is selected depending upon acceptable delay, memory usage, and processing speed required. The flexibility in terms of stacking of the bands provides twice the number of potential band edge placements, which is advantageous for hearing loss fitting, especially at low frequencies. The same filter coefficients can be used for analysis and synthesis, to reduce memory usage.
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