共查询到19条相似文献,搜索用时 132 毫秒
1.
基于ARM7内核S3C44B0X微处理器内置IIS总线和音频数模转换芯片CS4334,详细设计了S3C44B0X内置IIS总线接口和芯片CS4334的连接方法,搭建了以二者为基础的嵌入式工作平台.基于此工作平台,实现了wave文件播放,并给出了具体实现程序. 相似文献
2.
基于ARM7内核S3C44BOX微处理器内置ⅡS总线和音频数模转换芯片CS4334,详细设计了S3C44BOX内置ⅡS总线接口和芯片CS4334的连接方法,搭建了以二者为基础的嵌入式工作平台.基于此工作平台,实现了wave文件播放,并给出了具体实现程序. 相似文献
3.
4.
针对ARM芯片S3C44B0X内置的强大的LCD控制器,通过分析其底层驱动的工作原理,给出了S3C44B0XLCD控制器与LCD芯片LTBHBT203G31K接口的典型应用设计方案,在此基础上设计了与不同LCD模块连接时的通用设置方案。实验结果表明,该设计方法可快速应用于LCDS3C44B0X与多种LCD的接口配置中,且适用性好、通用性强。 相似文献
5.
6.
7.
基于PDIUSBD12的S3C44B0X下USB通信的实现 总被引:1,自引:0,他引:1
本文基于ARM7内核S3C44B0X微处理器和USB接口芯片PDIUSBD12,详细设计了S3C44B0X与芯片PDIUSBD12的连接方法,并给出了Device设备中USB固件程序,Host端USB驱动程序和应用程序的设计方案,实现了上下位机的USB通信。 相似文献
8.
9.
基于ARM的船用传感器集成平台 总被引:1,自引:0,他引:1
介绍基于ARM7微控制器,设计船用传感器集成平台的硬件软件实现方法,给出了以S3C44B0X芯片为核心的硬件设计的原理图,详细阐述了S3C44B0X CPU核心电路、模拟信号测量电路、周期信号测量电路以及系统测控软件的设计方法.ARM船用传感器集成平台,利用其强大的测量控制能力及数据计算处理能力,可以配接机舱内十多种模拟式和数字式传感器,应用于中小型船舶机舱集中监视与报警系统中. 相似文献
10.
11.
传统基于Tangram的音频伪装方法所采用的变换模型为仿射变换模型,变换精度低且不满足基本的正交关系,从而无法保证秘密音频与公开音频之间的拟合精度,同时当分段变换音频为恒值序列时,需添加随机扰动以保证变换后音频的恢复质量,由此会降低信道传输音频的听觉质量。针对此问题,提出一种结合密钥和随机标准正交基的音频伪装方法。首先对秘密音频和公开音频分段,利用密钥构造随机标准正交基;其次通过秘密音频小段在随机标准正交基上的投影来对秘密音频小段进行表达,从中选取包括均值幅值较大的前k个投影系数,并记录对应的索引位置;再次通过EMD-q密写方法嵌入到对应的公开音频小段中形成信道公开传输音频;最后通过信道公开传输音频提取的变换参数结合密钥重构秘密音频。实验表明,所提方法可充分利用随机标准正交基重构不同精度的秘密音频,且随着选取的幅值系数增多,恢复的秘密音频质量也越来越好,同时所述策略严格依赖于密钥,只有掌握正确密钥的用户才能进行高精度的重构。 相似文献
12.
大型龙门导轨磨床工作台整机运动场、主轴漂移量、补偿误差均会对控制精度产生影响,因此研究新的大型龙门导轨磨床工作台运动精度控制方法;根据大型龙门导轨磨床基本结构连接形态,求解主要技术参数,实现龙门导轨磨床工作台设计;从静态、动态两个角度出发,分析立柱部件、横梁部件受力情况,确定多目标拓扑与模态有限元条件,以此分析磨床工作台的运动特性;以动静态参数求解结果和整机运动场为基础,计算主轴漂移量的取值范围,结合相关运动参数计算补偿误差数值,结合对补偿误差数值计算以及PDDF控制器结果对工作台运动精度进行控制;实验结果表明,所提方法可以将工作台运动路径拟合误差控制在0~0.07 mm范围之内,满足龙门导轨磨床工作台运动精准控制的要求,实际应用效果好。 相似文献
13.
14.
介绍一种基于DSP的音频信号处理系统。该系统采用TI公司的低功耗数字信号处理器TMS320VC5509A作为主处理器,采用能与之无缝连接的TLV320AIC23作为音频CODEC芯片。在此基础上完成系统硬件平台的搭建和软件设计,可以作为对音频信号处理的通用平台。本文详细介绍DSP与CODEC芯片的接口设计方法,提出一种利用DMA中断的方式进行数据传送的方法,大大提高了处理速度。 相似文献
15.
通过应用音频质心与相邻3段区间的样本数量的关系这两个特性,提出了一种抗重采样时间伸缩攻击的音频水印算法,该算法通过修改频域系数进行嵌入秘密信息.听觉测试表明,隐藏有秘密信息的音频和原始音频是几乎完全一样的.鲁棒性实验结果表明,该算法能承受15%左右的重采样的TSM攻击,对于基于Stirmark Benchmark for Audio工具软件的一些常见攻击也具有很好的鲁棒性. 相似文献
16.
Automated audio segmentation and classification play important roles in multimedia content analysis. In this paper, we propose an enhanced approach, called the correlation intensive fuzzy c-means (CIFCM) algorithm, to audio segmentation and classification that is based on audio content analysis. While conventional methods work by considering the attributes of only the current frame or segment, the proposed CIFCM algorithm efficiently incorporates the influence of neighboring frames or segments in the audio stream. With this method, audio-cuts can be detected efficiently even when the signal contains audio effects such as fade-in, fade-out, and cross-fade. A number of audio features are analyzed in this paper to explore the differences between various types of audio data. The proposed CIFCM algorithm works by detecting the boundaries between different kinds of sounds and classifying them into clusters such as silence, speech, music, speech with music, and speech with noise. Our experimental results indicate that the proposed method outperforms the state-of-the-art FCM approach in terms of audio segmentation and classification. 相似文献
17.
Uma Srinivasan Silvia Pfeiffer Surya Nepal Michael Lee Lifang Gu Stephen Barrass 《Multimedia Tools and Applications》2005,27(1):105-141
Digital audio & video data have become an integral part of multimedia information systems. To reduce storage and bandwidth requirements, they are commonly stored in a compressed format, such as MPEG-1. Increasing amounts of MPEG encoded audio and video documents are available online and in proprietary collections. In order to effectively utilise them, we need tools and techniques to automatically analyse, segment, and classify MPEG video content. Several techniques have been developed both in the audio and visual domain to analyse videos. This paper presents a survey of audio and visual analysis techniques on MPEG-1 encoded media that are useful in supporting a variety of video applications. Although audio and visual feature analyses have been carried out extensively, they become useful to applications only when they convey a semantic meaning of the video content. Therefore, we also present a survey of works that provide semantic analysis on MPEG-1 encoded videos. 相似文献
18.
A video remix is generally created by arranging selected video clips and combining them with other media streams such as audio
clips and video transition effects. This paper proposes a system for semi-automatically creating video remixes of good expressive
quality. Given multiple original video clips, audio clips, and transition effects as the input, the proposed system generates
a video remix by five processes: I) video clip sequence generation, II) audio clip selection, III) audio boundary extraction,
IV) video segment extraction, and V) transition effect selection, based on the spatial and temporal structural patterns automatically
learned from professionally created video remix examples. Experiments using movie trailers of action genre as video remix
examples not only demonstrate that video remixing by professionals can be imitated based on examples but also reveal that
the video clip sequence generation and audio clip selection are the most important processes to improve the perceived expressive
quality of video remixes. 相似文献