Frequency scramble of speech and image by multidimensional digital signal processing

通过多维数字信号处理对语音和图像进行频率扰频

• 批准号: 03650267
• 负责人: KAWAMATA Masayuki
• 金额: $ 1.34万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650267/
• 关键词: Frequency scramble; Multidimensional digital filter; Periodically shift-variant digital system; Secure communication

This research studies multidimensional frequency scramble for secure communication of speech and images using multidimensional linear periodically shift-variant digital filters (LPSV filters). The notion of a generalized multidimensional transfer function is presented for LPSV filters. The frequency characteristic of the filters is discussed in terms of this transfer function. LPSV filters can serve as a frequency scrambler, because they can decompose the spectrum of an input signal into some spectral partitions and rearrange the spectrum. 2-D LPSV filters are designed based on the 1-D Parks-McClellan algorithm. The resultant LPSV filters divide the input spectrum into some components that are permuted and possibly inverted with keeping the symmetric of the spectrum. Application of the proposed scrabble method shows the effectiveness of frequency scramble for real images.

本研究利用多维线性周期性移变数字滤波器（LPSV滤波器），研究多维频率置乱在语音和图像保密通信中的应用。本文提出了LPSV滤波器的广义多维传递函数的概念。根据该传递函数讨论了滤波器的频率特性。LPSV滤波器可以用作频率加扰器，因为它们可以将输入信号的频谱分解为一些频谱分区并重新排列频谱。基于一维Parks-McClellan算法设计了二维LPSV滤波器。所得到的LPSV滤波器将输入频谱划分为一些分量，这些分量在保持频谱对称的情况下被置换并且可能被反转。实验结果表明，该方法对真实的图像进行置频是有效的。

项目成果

Masayuki KAWAMATA,Xuedong Yang,Tastuo HIGUCHI: "Fundamental study on periodically time-varying state-space digital filters-statistical analysis, scaling, and stability-" Proc. of IEEE International Conference on System Engineering. 348-351 (1992)

Masayuki KAWAMATA，Xuedong Yang，Tastuo HIGUCHI：“周期性时变状态空间数字滤波器的基础研究-统计分析、缩放和稳定性-”Proc。

楊 学東、川又 政征 樋口 龍雄: "周期的時変状態空間ディジタルフィルタにおける丸め誤差最小構造の合成" 電子情報通信学会春季大会 講演論文集. 1. 178- (1992)

Xudong Yang、Masaaki Kawamata 和 Tatsuo Higuchi：“周期性时变状态空间数字滤波器中最小舍入误差结构的综合”IEICE 春季会议论文集 1. 178- (1992)。

Xuedong Yang, Masayuki Kawamata, and Tatsuo Higuchi: "Synthesis of minimum average round off noise realizations of periodically time-varying state-space digital filters" Proc. of 1992 Joint Technical Conference on Circuits/Systems, Computers and Communica

Xudong Yang、Masayuki Kawamata 和 Tatsuo Higuchi：“周期性时变状态空间数字滤波器的最小平均舍入噪声实现的合成”Proc。

Mayuki Kawamata, Xuedong Yang and Tatsuo Higuchi,: "Fundamental study on periodically time-varying state-space digital filters --statistical analysis, scaling and stability--" Proc. of IEEE International Conference on Systems Engineering. 348-351. (1992)

Mayuki Kawamata、Xuedong Yang 和 Tatsuo Higuchi，“周期性时变状态空间数字滤波器的基础研究——统计分析、缩放和稳定性——”Proc。

村越 象,川又 政征,樋口 龍雄: "周波数スクランブルのための多次元ディジタルフィルタに関する基礎的考察" 電気関係学会東北支部連合会. 154 (1991)

Sho Murakoshi、Masaaki Kawamata、Tatsuo Higuchi：“用于频率扰频的多维数字滤波器的基本考虑”日本电气工程师东北分会 154 (1991)。