共查询到18条相似文献,搜索用时 109 毫秒
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提出了一种基于便携式DAB(Digital Audio BroadcaSting,数字音频广播)接收机的MP3播放器设计方案,并介绍了系统的软硬件设计思路.系统采用ARM7单片机作为系统控制器,利用SD卡存储MP3文件,用ST公司的音频解码芯片STA013实现MP3解码.数字语音信号通过D/A转换器MAX9850转换为... 相似文献
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数字音频广播(DAB)在我国国内处于起步阶段,本文首先简略介绍了目前DAB的发展现状,接着讨论了基于TI公司的DRE310芯片的一种数字广播接收方案,最后展望了国内数字音频广播发展的前景。 相似文献
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主要介绍调频广播接收芯片TEA5767在便携式video播放器中的应用.着重讲述了有关的FM接收、音频处理等方面的应用电路。 相似文献
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模拟音频信号经过数字化后,会产生很大的数据量,不适合存储和传输的需要。数字音频的压缩编码已经成为一门非常重要的技术。该文主要介绍数字音频信号的常用压缩编码方法,如MPEG-1、MPEG-2、AC-3数字音频压缩编码标准,并阐述了各自的性能特点及应用领域。然后结合应用软件——Delphi,介绍制作音频播放器的过程,并利用音频播放器实现mp3等格式音频文件的播放。 相似文献
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现在,很多AM和FM电台广播可以通过Internet收听,还有一些广播电台为不同的听众群提供了涵盖不同层次需求的节目,甚至有的广播电台只通过网络进行广播,节目包括爵士乐、多语种新闻和谈话性节目。如果希望收听网络广播节目,只需通过音频播放器即可实现。笔者最为喜爱的音频播放器是Nullsoft公司出品的Winamp,当然还有一些其他的常用音频播放器,例如Microsoft公司的Media Player、 如此之多的网络电台 每一个音频播放器都允许您浏览 相似文献
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方桦 《电子制作.电脑维护与应用》2002,(9):44-45,43
数字音频广播DAB(Digital Audio Broadcasting)是继传统的调幅、调频广播之后的第三代广播。最早的DAB研究始于70年代末期,至1988年,基础性研究和初步的试验结果都显示出它具有新一代广播系统的生命力,引起了世界各国的重视。该系统作为欧洲的一个重点开发项目,列为Eureka(尤里卡)147计划于1988年1月1 相似文献
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提出了一种基于单片机的MP3播放器的设计方法。采用PHILIPS公司的低电压、低功耗的LPC932A1高速单片机作为控制核心,采用SD卡作为歌曲存储介质,使用芬兰VLSL公司的VS1003B芯片(具有高速DSP芯)进行音频解码和回放,使之具有高性能、便携式、低成本的优点,实现了MP3播放器的播放部分与存储部分的分离,达到了大容量存储MP3播放器的目的。 相似文献
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Pohle T. Knees P. Schedl M. Pampalk E. Widmer G. 《Multimedia, IEEE Transactions on》2007,9(3):567-575
We present a novel interface to (portable) music players that benefit from intelligently structured collections of audio files. For structuring, we calculate similarities between every pair of songs and model a travelling salesman problem (TSP) that is solved to obtain a playlist (i.e., the track ordering during playback) where the average distance between consecutive pieces of music is minimal according to the similarity measure. The similarities are determined using both audio signal analysis of the music tracks and Web-based artist profile comparison. Indeed, we show how to enhance the quality of the well-established methods based on audio signal processing with features derived from Web pages of music artists. Using TSP allows for creating circular playlists that can be easily browsed with a wheel as input device. We investigate the usefulness of four different TSP algorithms for this purpose. For evaluating the quality of the generated playlists, we apply a number of quality measures to two real-world music collections. It turns out that the proposed combination of audio and text-based similarity yields better results than the initial approach based on audio data only. We implemented an audio player as Java applet to demonstrate the benefits of our approach. Furthermore, we present the results of a small user study conducted to evaluate the quality of the generated playlists 相似文献
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随着计算机多媒体技术和嵌入式技术的发展,便携的嵌入式播放器也日渐流行。由于嵌入式设备资源有限,因此如何在有限的资源下实现多媒体音视频的同步是一个重要的讨论问题。目前关于多媒体格式音视频同步的研究都很多,但是关于RMVB格式在嵌入式设备上音视频同步的研究还很少,本文主要介绍了缓冲区和时间戳结合的音视频同步方案,在设计的嵌入式RMVB播放器中验证,该播放器可以达到流畅播放的效果。 相似文献
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提出了基于Intel PXA27x微处理器的便携式多媒体播放器的总体方案,构建了系统的硬件平台和软件交叉开发环境.选用在Windows平台上运行的Cygwin作为Linux仿真环境,选定Mplayer作为嵌入式系统的移植目标,利用交叉编译工具Crosstool在嵌入系统中完整地实现了多媒体播放软件Mplayer的音频与... 相似文献
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In this paper we describe a study of the effectiveness of mobile learning (m-learning) in the form of podcasting, for teaching undergraduate students in Higher Education. Podcasting involves downloading a series of audio or video broadcasts (files) onto a digital media player, via a computer, over a period of weeks. These can then be watched or listened to when, where and as often as students choose. The use of digital media players, popularised by Apple’s iPod™, is widespread amongst undergraduate students. A pilot survey of Business and Management students indicated that over 74% owned some form of digital media player, with a further 7% indicating that they intended to purchase one in the next six months. 相似文献
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通过对当前常见的音频播放器的分析,概括出了目前流行的几种音频播放器的实现方法,有简单的方法,也有复杂的方法,可以根据业务需要和编程能力选择适合自己的设计模式。文章使用C++语言实现了音频播放器的解码及播放等主要模块,构建了1个完整的播放器。 相似文献
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《Computers & Industrial Engineering》1999,37(3):613-630
In game theory, it is usually assumed that each player has only one payoff function and the strategy set of the game is composed of the topological product of individual players’ strategy sets. In real business and system design or control problems, however, players’ strategy sets may be interactive and each player may have more than one payoff function. This paper, investigates the more general situation of multiple payoff and multiple person games in a normal form. In this paper, each player has several payoff functions which are dominated by certain convex cones, and the feasible strategy set of each player may be interactive with those of the other players. This new model is applied to a classical example without requiring variational and quasi-variational inequalities, or point-to-set mappings. 相似文献
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随着车载导航系统的飞速发展,具有视频播放能力的车载终端逐渐成为新的热点。本文根据这一需求设计了一种嵌入式流媒体播放器,方案基于IntelPXA270的硬件平台及嵌入式Linux的软件平台,采用无线上网方式,可支持ASF、RM格式的流文件解压,能够播放常见的MP1、MP2MP3、WAV音频和先进的MPEG-4视频,并可通过软件升级加入对其它格式的支持。 相似文献