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Filter bank arrangement and method for filtering and separation of an information signal in different frequency bands, in particular for audio signals in the hearing aid devices
Filter bank arrangement and method for filtering and separation of an information signal in different frequency bands, in particular for audio signals in the hearing aid devices
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机译:滤波器组布置和方法,用于滤波和分离不同频带中的信息信号,尤其是用于助听器中的音频信号
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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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