CODING FOR ARRAY SIGNAL USING MULTIDIMENSIONAL OVERSAMPLING TECHNIQUES

使用多维过采样技术对阵列信号进行编码

• 批准号: 08650476
• 负责人: TAMURA Yasutaka
• 金额: $ 1.41万
• 依托单位: YAMAGATA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650476/
• 关键词: Multidimensional signal Processing; Array signal processinng; 2-D DELTASIGMA-modulation; Wavefront generation; Piezoelectric polymer film

We have proposed a new digital to analog conversion technique for acoustical transducer array. This technique utilizes the multidimensional band-limited property of array signals. Using the technique, a large dynamic-range wavefront is converted to multiple 1-bit waveforms which are oversampled temporally and spatially.Following results are obtained :1.We have proposed an oversampling technique using two dimensional DELTASIGMA-modulation for 1-D or 2-D transducer arrays. The stability of 2-D first-order DELTASIGMA-modulation os confirmed. We have clarified the relation between the SN ratio and the parameters of the 2-D DELTASIGMA-modulation, such as sampling frequency and array intervals. The SN ratio increases 9dB for doubling the spatial or temporal sampling frequency.We have developed coding methods for matrix array, circular array and annular array.2.We have constructed a trial DA conversion system for acoustical transducer array. This system consists of 64ch digital pattern generator and array of switching amplifiers. The amplifiers are directly controlled by digital pattern signal. The output range is 2 Vpp to 100Vpp. The switching frequency range is lKHz to 10MHz.3.An ultrasonic array transducer was constructed by laminating P (VDF-TrFE) copolymer films with pattern electrode on a printed circuit board. The airborne dynamic-speaker array was also constructed.4.A focused acoustical beam was generated by the proposed system. The maximum error of the directivity was 0.3%, and the SN ratio of observed waveform at the focal point was 80dB (over-sampling ratio is 16 for space, 16 for time). The spherical wave was also generated using the annular array.

提出了一种新的声换能器阵列数模转换技术。该技术利用了阵列信号的多维带限特性。利用该技术，将大动态范围波前转换为多个1位波形，并在时间和空间上进行过采样。实验结果如下：1；我们提出了一种使用二维deltasigma调制一维或二维换能器阵列的过采样技术。证实了二维一阶deltasigma调制的稳定性。阐明了二维deltasigma调制的SN比与采样频率、阵列间隔等参数之间的关系。SN比增加9dB，使空间或时间采样频率加倍。我们开发了矩阵阵列、圆形阵列和环形阵列的编码方法。我们搭建了一个声学换能器阵列的数据转换试验系统。该系统由64ch数字方向发生器和开关放大器阵列组成。放大器由数字模式信号直接控制。输出范围为2vpp ~ 100Vpp。开关频率范围为lKHz ~ 10mhz。将P （VDF-TrFE）共聚物薄膜与图案电极层合在印刷电路板上，构建了超声阵列换能器。构建了机载动态扬声器阵列。该系统产生了聚焦声束。指向性最大误差为0.3%，焦点处观测波形SN比为80dB（空间过采样比为16，时间过采样比为16）。利用环形阵列也产生了球面波。

项目成果

O.Akasaka, M.Okada, K.Abe, Y.Tamura: "Coding with Multi-dimensional signal processing for acoustical sensor array-Oversampled drive of 2-D array using 2-D DELTASIGMA Modulation-" Proceedings of SICE. 36. 887-888 (1997)

O.Akasaka、M.Okada、K.Abe、Y.Tamura：“声学传感器阵列的多维信号处理编码 - 使用 2-D DELTASIGMA 调制对 2-D 阵列进行过采样驱动 -”SICE 论文集。

Yasutaka Tamura: "Wavefront Generation Using a Dense Array and Multidimensional ΔΣ Modulation" Jpn. J. Appl. Phys.36. 3053-3056 (1997)

Yasutaka Tamura：“使用密集阵列和多维 ΔΣ 调制的波前生成”J. Appl. 3053-3056 (1997)

赤坂修: "多次元ΔΣ変調と密アレイを用いる音場制御" 超音波エレクトロニクスの基礎と応用に関するシンポジウム予稿集. 17. 265-266 (1996)

Osamu Akasaka：“使用多维 ΔΣ 调制和密集阵列进行声场控制”超声波电子学基础与应用研讨会论文集 17. 265-266 (1996)。

川上 直哉: "多次元ΔΣ変調とオーバサンプリング技術を用いた高分子密アレイトランスデューサの開発" 超音波エレクトロニクスの基礎と応用に関するシンポジウム予稿集. 18. 87-88 (1997)

Naoya Kawakami：“使用多维 ΔΣ 调制和过采样技术开发密集聚合物阵列换能器”超声波电子学基础与应用研讨会论文集 18. 87-88 (1997)。

Y.Tamura, M.Okada, O.Akasaka: "Wavefront Generation Using a Dense Array and Multidimensional DELTASIGMA Modulation" Proceedings of the symposium on ultrasonic electronics. 17. 265-266 (1996)

Y.Tamura、M.Okada、O.Akasaka：“使用密集阵列和多维 DELTASIGMA 调制的波前生成”超声波电子学研讨会论文集。