基于相位調(diào)制的非均勻DFT調(diào)制濾波器組的構(gòu)造算法

周芳; 水鵬朗

doi:10.11999/JEIT170040

基于相位調(diào)制的非均勻DFT調(diào)制濾波器組的構(gòu)造算法

doi: 10.11999/JEIT170040

周芳¹,
水鵬朗²

2.
(西安電子科技大學(xué)雷達(dá)信號(hào)處理國(guó)家重點(diǎn)實(shí)驗(yàn)室西安 710071) ②(桂林電子科技大學(xué)生命與環(huán)境科學(xué)學(xué)院桂林 541004)

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(61261032)

計(jì)量
- 文章訪問(wèn)數(shù): 1227
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- PDF下載量: 258
- 被引次數(shù): 0
出版歷程
- 收稿日期: 2017-01-11
- 修回日期: 2017-04-12
- 刊出日期: 2017-09-19

Construction of Nonuniform DFT Modulated Filter Banks via Phase Modulation

ZHOU Fang¹,
SHUI Penglang²

Funds:

The National Natural Science Foundation of China (61261032)

摘要

摘要: 由于具有靈活的頻率劃分能力，非均勻?yàn)V波器組在語(yǔ)音、圖像等信號(hào)的處理中有著廣泛的應(yīng)用。該文針對(duì)非均勻DFT調(diào)制濾波器組無(wú)法直接合并構(gòu)造的缺點(diǎn)，提出一種基于相位調(diào)制的構(gòu)造方法。在該方法中，非均勻DFT調(diào)制濾波器組的子帶濾波器由均勻DFT調(diào)制濾波器組經(jīng)子帶合并和相位調(diào)制獲得。構(gòu)造所得的非均勻?yàn)V波器組與原均勻?yàn)V波器組的重構(gòu)特性近似相等。同時(shí)推導(dǎo)出非均勻子帶濾波器具備良好頻率特性的條件。理論分析和仿真結(jié)果均表明了所提的構(gòu)造方法的有效性。
- 離散傅里葉變換調(diào)制 /
- 非均勻?yàn)V波器組 /
- 子帶合并 /
- 相位調(diào)制
Abstract: Owing to its flexible frequency decomposition ability, nonuniform filter banks are widely applied to speech and image signal processing. However, the nonuniform Discrete Fourier Transform (DFT) modulated filter bank can not be constructed by directly merging certain subbands of the uniform one. In order to overcome this deficiency, a novel construction approach is proposed, in which the subband filters of the nonuniform filter bank are obtained by jointly employing the subband merging and phase modulation of the uniform one. The resultant nonuniform filter bank exhibits the very approximate overall performance as the uniform one. Moreover, the conditions are derived for the nonuniform DFT modulated filter banks to possess satisfactory frequency characteristics. Both the theoretical analysis and simulation results show the effectiveness of the proposed method.
- DFT modulated /
- Nonuniform filter bank /
- Subband merging /
- Phase modulation

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參考文獻(xiàn)(20)

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