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Peer-To-Peer Systems and Massively Multiplayer Online Games
Peer-to-Peer Systems and Massively Multiplayer Online Games Speaker: Jehn-Ruey Jiang CSIE Department National Central University P2P Systems Client/Server Architecture GET /index.html HTTP/1.0 HTTP/1.1 200 OK ... Server Clients 3/66 Peer-to-Peer Architecture Gateway Server Peers 4/66 The architectures Server-based architecture Client-Server / Server-Cluster Problems: Limited resources All loads are centered on the server Server-based architecture has low scalability. The setup and maintenance cost is high. Peer-to-Peer (P2P) architecture Advantages: Distributing loads to all users Users consume and provide resources P2P architecture has high scalability. The setup and maintenance cost is low. The Client Side Today‟s clients can perform more roles than just forwarding users requests Today‟s clients have: more computing power more storage space Thin client Fat client 6/66 Evolution at the Client Side DEC‟S VT100 IBM PC PC @ 4-core 4GHz @ 4.77MHz No storage 300GB HD 360k diskettes „70 „80 2008 7/66 What Else Has Changed? The number of home PCs is increasing rapidly Most of the PCs are “fat clients” As the Internet usage grow, more and more PCs are connecting to the global net Most of the time PCs are idle How can we use all this? Peer-to-Peer (P2P) 8/66 What is peer-to-peer (P2P)? “Peer-to-peer is a way of structuring distributed applications such that the individual nodes have symmetric roles. Rather than being divided into clients and servers each with quite distinct roles, in P2P applications a node may act as both -
04. Peer-To-Peer Applications
Internet Technology 04. Peer-to-Peer Applications Paul Krzyzanowski Rutgers University Spring 2016 February 15, 2016 CS 352 © 2013-2016 Paul Krzyzanowski 1 Peer-to-Peer (P2P) Application Architectures • No reliance on a central server • Machines (peers) communicate with each other • Pools of machines (peers) provide the service • Goals client server – Robustness • Expect that some systems may be down – Self-scalability • The system can handle greater workloads as more peers are added peers February 15, 2016 CS 352 © 2013-2016 Paul Krzyzanowski 2 Peer-to-Peer networking “If a million people use a web site simultaneously, doesn’t that mean that we must have a heavy-duty remote server to keep them all happy? No; we could move the site onto a million desktops and use the Internet for coordination. Could amazon.com be an itinerant horde instead of a fixed central command post? Yes.” – David Gelernter The Second Coming – A Manifesto See http://edge.org/conversation/the-second-coming-a-manifesto February 15, 2016 CS 352 © 2013-2016 Paul Krzyzanowski 3 Peer to Peer applications • P2P targets diverse solutions – Cooperative computation – Communications (e.g., Skype) – Exchanges, digital currency (bitcoin) – DNS (including multicast DNS) – Content distribution (e.g., BitTorrent) – Storage distribution • P2P can be a distributed server – Lots of machines spread across multiple datacenters Today, we’ll focus on file distribution February 15, 2016 CS 352 © 2013-2016 Paul Krzyzanowski 4 Four key primitives • Join/Leave – How do you join a P2P system? -
You Are Not Welcome Among Us: Pirates and the State
International Journal of Communication 9(2015), 890–908 1932–8036/20150005 You Are Not Welcome Among Us: Pirates and the State JESSICA L. BEYER University of Washington, USA FENWICK MCKELVEY1 Concordia University, Canada In a historical review focused on digital piracy, we explore the relationship between hacker politics and the state. We distinguish between two core aspects of piracy—the challenge to property rights and the challenge to state power—and argue that digital piracy should be considered more broadly as a challenge to the authority of the state. We trace generations of peer-to-peer networking, showing that digital piracy is a key component in the development of a political platform that advocates for a set of ideals grounded in collaborative culture, nonhierarchical organization, and a reliance on the network. We assert that this politics expresses itself in a philosophy that was formed together with the development of the state-evading forms of communication that perpetuate unmanageable networks. Keywords: pirates, information politics, intellectual property, state networks Introduction Digital piracy is most frequently framed as a challenge to property rights or as theft. This framing is not incorrect, but it overemphasizes intellectual property regimes and, in doing so, underemphasizes the broader political challenge posed by digital pirates. In fact, digital pirates and broader “hacker culture” are part of a political challenge to the state, as well as a challenge to property rights regimes. This challenge is articulated in terms of contributory culture, in contrast to the commodification and enclosures of capitalist culture; as nonhierarchical, in contrast to the strict hierarchies of the modern state; and as faith in the potential of a seemingly uncontrollable communication technology that makes all of this possible, in contrast to a fear of the potential chaos that unsurveilled spaces can bring. -
Get Real: Print This
Get Real: Print This http://www.corante.com/getreal/archives/032237print.html from Get Real by Marc Eisenstadt January 11, 2005 BitTorrent, eXeem, Meta-Torrent, Podcasting: "What? So What?" SUMMARY: The index that facilitates the sharing of files on a large scale is also the Achilles heel of peer-to-peer file-sharing, because it is vulnerable to litigation and closure. So what happens if the index is itself distributed? I try to get my head around the latest in peer-to-peer file sharing, and explain a bit about what I've learned, including the fact that BitTorrent's power rests in its 'swarm' distribution model, but not necessarily in your end-user download speed. What has this got to do with podcasting? (Answer: invisible P2P plumbing helps the podcasting wheel go round). [Warning: lengthy article follows]. First, some history (skip ahead to the next section if you're already bored with the Napster, Gnutella, KaZaa, and BitTorrent saga). Napster opened our eyes to the power of distributed file sharing on a massive scale. But it was closed down by lawsuits to stop it from listing copyrighted works for which the owners would naturally have preferred to collect royalties (there are thousands of commentaries on the pros and cons of such royalties, but that's not the focus of this posting). Successive generations of tools such as Gnutella, KaZaa, and now BitTorrent have created their own buzz, their own massive followings, their own headaches, and their own solutions to others' headaches. Here's my rundown of the 'big ideas' (and the people behind them): Napster (Shawn Fanning): This was the Mother of big-time peer-to-peer (P2P) file transfers, i.e. -
Title: P2P Networks for Content Sharing
Title: P2P Networks for Content Sharing Authors: Choon Hoong Ding, Sarana Nutanong, and Rajkumar Buyya Grid Computing and Distributed Systems Laboratory, Department of Computer Science and Software Engineering, The University of Melbourne, Australia (chd, sarana, raj)@cs.mu.oz.au ABSTRACT Peer-to-peer (P2P) technologies have been widely used for content sharing, popularly called “file-swapping” networks. This chapter gives a broad overview of content sharing P2P technologies. It starts with the fundamental concept of P2P computing followed by the analysis of network topologies used in peer-to-peer systems. Next, three milestone peer-to-peer technologies: Napster, Gnutella, and Fasttrack are explored in details, and they are finally concluded with the comparison table in the last section. 1. INTRODUCTION Peer-to-peer (P2P) content sharing has been an astonishingly successful P2P application on the Internet. P2P has gained tremendous public attention from Napster, the system supporting music sharing on the Web. It is a new emerging, interesting research technology and a promising product base. Intel P2P working group gave the definition of P2P as "The sharing of computer resources and services by direct exchange between systems". This thus gives P2P systems two main key characteristics: • Scalability: there is no algorithmic, or technical limitation of the size of the system, e.g. the complexity of the system should be somewhat constant regardless of number of nodes in the system. • Reliability: The malfunction on any given node will not effect the whole system (or maybe even any other nodes). File sharing network like Gnutella is a good example of scalability and reliability. -
Home Audio Taping of Copyrighted Works and the Audio Home Recording Act of 1992: a Critical Analysis Joel L
Hastings Communications and Entertainment Law Journal Volume 16 | Number 2 Article 4 1-1-1993 Home Audio Taping of Copyrighted Works and the Audio Home Recording Act of 1992: A Critical Analysis Joel L. McKuin Follow this and additional works at: https://repository.uchastings.edu/ hastings_comm_ent_law_journal Part of the Communications Law Commons, Entertainment, Arts, and Sports Law Commons, and the Intellectual Property Law Commons Recommended Citation Joel L. McKuin, Home Audio Taping of Copyrighted Works and the Audio Home Recording Act of 1992: A Critical Analysis, 16 Hastings Comm. & Ent. L.J. 311 (1993). Available at: https://repository.uchastings.edu/hastings_comm_ent_law_journal/vol16/iss2/4 This Article is brought to you for free and open access by the Law Journals at UC Hastings Scholarship Repository. It has been accepted for inclusion in Hastings Communications and Entertainment Law Journal by an authorized editor of UC Hastings Scholarship Repository. For more information, please contact [email protected]. Home Audio Taping of Copyrighted Works and The Audio Home Recording Act of 1992: A Critical Analysis by JOEL L. McKuIN* Table of Contents I. Home Taping: The Problem and its Legal Status ....... 315 A. Constitutional and Statutory Background ........... 315 B. Home Taping or Home "Taking"?: The History of Home Taping's Legal Status ........................ 318 C. New Technologies Sharpen the Home Taping Problem ............................................ 321 1. The DAT Debacle .............................. 321 2. Other New Technologies ........................ 322 II. The Audio Home Recording Act of 1992 (AHRA) ..... 325 A. Serial Copy Management System (SCMS) .......... 325 B. Royalties on Digital Hardware and Media .......... 326 C. Prohibition of Copyright Infringement Actions ..... 328 III. -
TN Production Assistant – V1.0.2.X User Notes
TN Production Assistant – v1.0.2.x User Notes Introduction This software is designed to assist Talking Newspapers in the preparation of a ‘copy-ready’ image of a multi-track Talking Newspaper or Talking Magazine production from individual track recordings created during a preceding ‘studio session’ using a stand-alone digital recorder or other digital recording facility such as a PC with digital recording software. Prerequisites A PC running a Windows Operating System (XP or later). Sufficient hard drive capacity to accommodate the software, working and archive storage (recommended minimum of 1GB) Audio Editing Software (e.g. Adobe Audition, Goldwave or Audacity) installed ‘Microsoft .NET 4 Environment’ installed (this will be automatically installed during the installation procedure below providing an internet connection exists) Installing the software The application is installed from the Downloads Section of the Hamilton Sound website at http://hamiltonsound.co.uk . Please follow the instructions displayed on the website and as presented by the installer. In case of difficulty please contact Hamilton Sound at [email protected] for assistance and advice. Please also report any bugs detected in use or suggested improvements to the above email address. On first installation a welcome screen will be presented followed by the set-up screen. Check and adjust if required the set-up parameters from their pre-set values (see Set-Up below). Configuration Before first using this software it is important to ensure that the configuration parameters are set appropriately for your purposes. The default values of each parameter are shown in parenthesis. TIP – Hold mouse cursor over any field for tips on what to enter there. -
A Reference for the Scene Page 1
WareZ101.org - A Reference For The Scene Page 1 Home *Articles* Downloads Discussion Forum Search Links Contact Us December 17 2006 07:38:33 What are these files I downloaded? How do I "open" them? Login This article will discuss the following popular download formats: Username *Official Scene Releases (RAR splits) Password *Single ZIP Files *Single RAR Files *Single TAR Files Login *ISO Files *BIN/.CUE Files Not a member *IMG Files (CD's, 700 MB and under) yet? *IMG Files (DVD's, 4.4 GB and under) Click here to *MDF/.MDS Files register. *CCD/.IMG/.SUB Files *MP3/.M3U Files Forgotten your *WMA Files password? *OGG Files Request a new *AVI Files one here. *MPG/.MPEG Files *VCD Files & Folders Users Online *SVCD Files & Folders *VOB/.IFO/.BUP Files Guests Online: 1 --- No Members Online Official Scene Release Format Registered Example: Members: 94 Newest Member: NoX Latest Articles Coded Anti- Piracy The Bittorrent Bible... Secrets of the Pirat... How to use Daemon Tools How to Convert DVDs ... Member Poll What's your primary source of warez? FTP Servers (Public) FTP Servers (Private) http://warez101.org/readarticle.php?article_id=36 17/12/2006 06:39:09 PM WareZ101.org - A Reference For The Scene Page 2 HTTP Servers Torrent Sites E-Mule Sites P2P Application(s) IRC Servers Other You must login to vote. Shoutbox You must login to post a message. 5cr3w3d DATE: 02/09/2006 17:52 Testing 1-2-3 I have somehow NOTE: This particular release contains 3CD's, as you can see above. Your particular release may not have found my way these folders, all the RAR's, .NFO and .SFV files may be in a single folder with no subfolders. -
Case COMP/C-3/37.792 Microsoft)
EN EN EN COMMISSION OF THE EUROPEAN COMMUNITIES Brussels, 21.4.2004 C(2004)900 final COMMISSION DECISION of 24.03.2004 relating to a proceeding under Article 82 of the EC Treaty (Case COMP/C-3/37.792 Microsoft) (ONLY THE ENGLISH TEXT IS AUTHENTIC) (Text with EEA relevance) EN EN COMMISSION DECISION of 24.03.2004 relating to a proceeding under Article 82 of the EC Treaty (Case COMP/C-3/37.792 Microsoft) (ONLY THE ENGLISH TEXT IS AUTHENTIC) (Text with EEA relevance) THE COMMISSION OF THE EUROPEAN COMMUNITIES, Having regard to the Treaty establishing the European Community, Having regard to Council Regulation No 17 of 6 February 1962, First Regulation implementing Articles 85 and 86 of the Treaty1, and in particular Article 3 and Article 15(2) thereof, Having regard to the complaint lodged by Sun Microsystems, Inc. on 10 December 1998, alleging infringements of Article 82 of the Treaty by Microsoft and requesting the Commission to put an end to those infringements, Having regard to the Commission decision of 1 August 2000 to initiate proceedings in Case IV/C-3/37.345, Having regard to the Commission decision of 29 August 2001 to initiate proceedings in this case, and to join the findings in Case IV/C-3/37.345 to the procedure followed under this case, Having given the undertaking concerned the opportunity to make known their views on the objections raised by the Commission pursuant to Article 19(1) of Regulation No 17 and Commission Regulation (EC) No 2842/98 of 22 December 1998 on the hearing of parties in certain proceedings under Articles 85 and 86 of the EC Treaty2, Having regard to the final report of the hearing officer in this case, After consulting the Advisory Committee on Restrictive Practices and Dominant Positions, 1 OJ 13, 21.2.1962, p. -
Understanding Audio Production Practices of People with Vision Impairments
Understanding Audio Production Practices of People with Vision Impairments Abir Saha Anne Marie Piper Northwestern University University of California, Irvine Evanston, IL, USA Irvine, CA, USA [email protected] [email protected] ABSTRACT of audio content creation, including music, podcasts, audio drama, The advent of digital audio workstations and other digital audio radio shows, sound art and so on. In modern times, audio content tools has brought a critical shift in the audio industry by empower- creation has increasingly become computer-supported – digital in- ing amateur and professional audio content creators with the nec- struments are used to replicate sounds of physical instruments (e.g., essary means to produce high quality audio content. Yet, we know guitars, drums, etc.) with high-fdelity. Likewise, editing, mixing, little about the accessibility of widely used audio production tools and mastering tasks are also mediated through the use of digital for people with vision impairments. Through interviews with 18 audio workstations (DAWs) and efects plugins (e.g., compression, audio professionals and hobbyists with vision impairments, we fnd equalization, and reverb). This computer-aided work practice is that accessible audio production involves: piecing together accessi- supported by a number of commercially developed DAWs, such 1 2 3 ble and efcient workfows through a combination of mainstream as Pro Tools , Logic Pro and REAPER . In addition to these com- and custom tools; achieving professional competency through a mercial eforts, academic researchers have also invested signifcant steep learning curve in which domain knowledge and accessibility attention towards developing new digital tools to support audio are inseparable; and facilitating learning and creating access by production tasks (e.g., automated editing and mixing) [29, 57, 61]. -
I/O of Sound with R
I/O of sound with R J´er^ome Sueur Mus´eum national d'Histoire naturelle CNRS UMR 7205 ISYEB, Paris, France July 14, 2021 This document shortly details how to import and export sound with Rusing the packages seewave, tuneR and audio1. Contents 1 In 2 1.1 Non specific classes...................................2 1.1.1 Vector......................................2 1.1.2 Matrix......................................2 1.2 Time series.......................................3 1.3 Specific sound classes..................................3 1.3.1 Wave class (package tuneR)..........................4 1.3.2 audioSample class (package audio)......................5 2 Out 5 2.1 .txt format.......................................5 2.2 .wav format.......................................6 2.3 .flac format.......................................6 3 Mono and stereo6 4 Play sound 7 4.1 Specific functions....................................7 4.1.1 Wave class...................................7 4.1.2 audioSample class...............................7 4.1.3 Other classes..................................7 4.2 System command....................................8 5 Summary 8 1The package sound is no more maintained. 1 Import and export of sound with R > options(warn=-1) 1 In The main functions of seewave (>1.5.0) can use different classes of objects to analyse sound: usual classes (numeric vector, numeric matrix), time series classes (ts, mts), sound-specific classes (Wave and audioSample). 1.1 Non specific classes 1.1.1 Vector Any muneric vector can be treated as a sound if a sampling frequency is provided in the f argument of seewave functions. For instance, a 440 Hz sine sound (A note) sampled at 8000 Hz during one second can be generated and plot following: > s1<-sin(2*pi*440*seq(0,1,length.out=8000)) > is.vector(s1) [1] TRUE > mode(s1) [1] "numeric" > library(seewave) > oscillo(s1,f=8000) 1.1.2 Matrix Any single column matrix can be read but the sampling frequency has to be specified in the seewave functions. -
Computerized Data Collection and Analysis
Computerized Data Collection & Analysis IASCL/SRCLD Bunta, Ingram, Ingram Madison, WI, 2002 Computerized Data Collection and Analysis Paper Presented at the Joint Conference of the IX International Congress for the Study of Child Language and the Symposium on Research in Child Language Disorders, Madison, WI, 2002 Ferenc Bunta, [email protected], http://www.public.asu.edu/~ferigabi/ David Ingram, [email protected] Kelly Ingram, [email protected] Arizona State University, Tempe, AZ, USA Why Diigiitiize • data storage (about 4 hours on 1 CD at 22 kHz, 16 bit, mono) • cost-effectiveness (computer, storage options, etc.) • flexibility & efficiency – transferability (CD, HD, zip, other), file sharing via e-mail or web posting – accessibility computer or even CD player – ability to revisit any portion of your original recordings quickly & easily; no painstaking searching for segments (visual information) – ease of transcribing and reliability checks – editing opportunities (extraction, noise reduction, amplification, etc.) – organizing, rearranging, & filing – acoustic analyses Diigiitiiziing & Hardware Considerations - digital sampling versus analog tapes - use appropriate specifications - directly onto the computer or using an external recording device (such as audio tape, DAT recorder, etc.) and then digitizing - find a balance based on recommendations and one’s needs - understand the consequences of your choices - consider pre-emphasis and low-pass filtering (if needed) System Recommendations (Hardware) Recording equipment (general): For the most part, you can use the equipment you have, or you may record directly onto the computer using your microphone. - microphone (use your preferred device; the one you have used in the past) - recording device (your own professional voice recorder (analog tape, DAT, etc.), use an external sound card, or record directly onto the computer) NOTE: Numerous recording devices (even most digital recorders, such as DAT, MiniDisc, etc.) require you to re-digitize (i.e., re-record the sample onto your computer).