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.

本研究研究使用多维线性周期性移位变化数字滤波器（LPSV 滤波器）实现语音和图像安全通信的多维频率加扰。为 LPSV 滤波器提出了广义多维传递函数的概念。根据该传递函数讨论滤波器的频率特性。 LPSV滤波器可以用作扰频器，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。 2-D LPSV 滤波器是基于一维 Parks-McClellan 算法设计的。由此产生的 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进行排列并可能反转。所提出的扰乱方法的应用显示了频率扰乱对真实图像的有效性。

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。

Sho Murakoshi, Masayuki Kawamata and Tatsuo Higuchi: "Frequency scramble for secure communication of images using multidimensional digital filters" Proc. of 35th Midwest Symposium on Circuits and Systems. (1992)

Sho Murakoshi、Masayuki Kawamata 和 Tatsuo Higuchi：“使用多维数字滤波器进行图像安全通信的频率扰乱”Proc。