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Software components in an analysis pipeline can be written in-house, be downloaded from a free source or be purchased commercially. When writing software in-house, these should be written in such a way that they can be reused. Often, others have already written many of the routines, although it can sometimes be. Computer-Based Classification of Dermoscopy Images of Melanocytic Lesions on Acral Volar Skin. Our linear classifier achieved a sensitivity (SE) of 100%, a specificity (SP) of 95.9%, and an area under the receiver operating characteristic curve (AUC) of 0.993 using a leave-one-out. Download full-size image.

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(October 2009) () Over-the-air digital TV signals do not reach very far outside the city in which they are transmitted. FTA Receivers can be used in rural locations as a fairly reliable source of television without subscribing to cable or a major satellite provider. Terrestrial broadcasters use some of the nearly 30 North American satellites to transmit their feeds for internal purposes. These unencrypted feeds can then be received by anyone with the proper decoder. Satellite signals are normally receivable well beyond the terrestrial station's coverage area. Enthusiasts also use FTA receivers to watch the numerous that are present on many of those satellites. In theory, a viewer in (the smallest North American TV market) could have received what little local and programming is available terrestrially, alongside a K u band free-to-air dish for additional commercial networks (such as individual and affiliates from, formerly at 123°W) and educational programming ( at 125°W).

There is no assurance that any individual FTA broadcast will remain available or that those which do remain will continue broadcast in a compatible format - in this example, such a viewer would have lost ABC and Fox in mid-2009 due to Equity's bankruptcy. Signal piracy [ ]. This section does not any. Unsourced material may be challenged and. (October 2009) () Free-To-Air receivers generally use the same technology standards (such as DVB-S, MPEG-2) as those used by pay-TV networks such as Echostar's and BCE's. FTA receivers, however, lack the smartcard readers or decryption modules designed for the reception of pay-TV programming, since the receivers are designed only for reception of unencrypted transmissions.

On occasion, where a pay-TV service's encryption system has been very seriously compromised, to the extent that it can be emulated in software and without the presence of a valid access card, hackers have been able to an FTA receiver's software and add the necessary emulation to allow unauthorized reception of pay TV channels. Manufacturers, importers, and distributors of FTA receivers officially do not condone this practice and some will not sell to or support individuals who they believe will be using their products for this purpose, use of software usually voiding any warranties. Unlike traditional methods of that involve altered used with satellite receivers manufactured and distributed by the provider, piracy involving FTA receivers require only an update to the receiver's firmware. That disable access cards may not have the same or any effect on FTA receivers because they are not capable of being updated remotely. The firmware in receivers themselves cannot be overwritten with malicious code via satellite as provider-issued receivers are. FTA receivers also have the advantage of being able to receive programming from multiple providers plus legitimate free-to-air DVB broadcasts which are not part of any package, a valuable capability which is conspicuously absent from most 'package receivers' sold by DBS providers.

Is an international standard and thus the industry-imposed restriction that a Bell TV receiver is not interchangeable with a Dish Network receiver (the same box) and neither are interchangeable with a receiver (also DVB) is an artificial one created by providers and not respected by either pirates or legitimate unencrypted FTA viewers. Periodically, a provider will change the processes in which its encryption information is sent. When this happens, illegitimate viewing is disrupted. Third-party coders may release an updated altered version of the FTA receiver software on, sometimes hours to days after the countermeasure is implemented, although some countermeasures have allowed the encryption to remain secure for several months or longer. The receivers, meanwhile, remain able to receive unencrypted broadcasts and (for some models) terrestrial programming.

The same is not true of standard subscription TV receivers, whereby unsubscribing from a pay-TV package causes loss of all channels. The use of allows providers to send new smart cards to all subscribers as existing compromised encryption schemes (such as 1 and 2) are replaced with new schemes (currently Nagravision 3). This 'card swap' process can provide pay-TV operators with more effective control over, but at the expense of replacing smart cards in all existing subscribed receivers.

While this approach is used by most providers, deployments tend to be slowed due to cost. While smart-card piracy often involves individuals who re-program access cards for others (usually for a price), piracy using FTA receivers involves third-party software that is relatively easy to upload to the receiver and can even be uploaded using a USB device, network, or serial link (a process called 'flashing').

Most such firmware is distributed freely on the Internet. Websites that third-party coders use to share this software often have anywhere from 50,000 to over 200,000 registered users. Another method of pirate decryption that has become popular recently is known as (IKS). This is accomplished by an Ethernet cable hooked to the receiver that allows updated decryption keys to be fed to the unit directly from the internet. The common scrambling system and the various are based on the use of a legitimately subscribed which generates a continuous stream of usable to decrypt one channel on a receiver.

A key-sharing scheme operates by redistributing these keys in real-time to multiple receivers in an unlimited number of locations so that one valid smartcard may serve almost 10000 viewers. As of June 2009 this was the only active system still in widespread use in North American satellite TV, due to the shutdown of the compromised Nagravision 2 system by providers such as Dish Network and Bell TV. However, this is limited by the interval of the stream of keys or also called CW (Control Words).

Usually, the interval for the renewal of the CWs is ±10 seconds, but other systems (i.e. NDS3) have CW intervals of 5 seconds or less. Each channel usually has a different set of CWs for decryption and thus each box currently watching a specific channel must periodically request the current CWs from the server/smart-card for that specific channel. So arguably, the sharing of the card might not be unlimited. There are some restrictions to this like the frequency of CW changes and also the latency of the network. If the CWs do not arrive in time, there could be a freeze or crackle in the picture. There are of course other more costly possibilities like having several legitimately subscribed cards each handling a few channels and a CW caching server.

The dependence on an external server also compromises privacy for individual viewers, as well as rendering the system incompatible with many receiver models which lack the ability to connect to an outside network and/or lack the ability to set or modify the various keys or identifiers used in communication between the card and receiver. Common features [ ]. The installation menu Installation menu [ ] This is the main control panel that allows the user to configure the receiver to interact with, switches, motors, and other equipment. The user selects the LNB type, frequency, appropriate switch port, and motor configuration. If all the settings are correct for the appropriate equipment, a signal bar showing strength and quality will appear.

At that point, the receiver can be used to scan the satellite to detect channels. Blind scan [ ] There are 63 satellites in orbit over the Americas, 57 over Europe and a further 64 over Asia, a significant number of which will be receivable from any one location. Each of these has a different number of active. Each transponder operates at a different frequency and symbol rate. Many FTA receivers are designed to detect any active transponders and any channels on those transponders. Because they are designed to do this without needing to be pre-programmed with the transponder information for each satellite, this process is referred to as a 'blind' scan—as opposed to a satellite scan, which scans according to pre-set transponder values. Channel edit/sort [ ].

Channel Master editor Once a scan is complete, the channels can often be sorted alphabetically, in satellite/transponder order, or in scrambled/unscrambled order. Additionally, third-party software often allows the option of sorting by the channel's Station Identification (SID) number. This is so that the individual channels can be numbered in a way that mimics the lineup of Dish Network or Bell TV.

Channels can also be renamed or deleted, either in an on-screen menu or with external software. The most popular software used to configure and sort channels was a program called Channel Master, which allowed the user to name, number, sort, and delete channels and then save them in a format that can then be written to the receiver. The file created that contains channel information is called a channel list. This channel editor application is not affiliated with the and appears to have last been updated in 2008.

Many older and discontinued receiver models are supported in Channel Master, though most newer and less popular ones are not. User settings [ ] Most FTA receivers give the user the option of configuring the,, TV type (/), and time settings. Typically, most FTA receivers can accept an MPEG2 video stream in either PAL-compatible (540/704/720 x 576) or NTSC-compatible (640 x 480) image formats and convert it for display on either a PAL or NTSC monitor.

There is some loss of image data due to NTSC's lower resolution. Some receivers also support output to,,. Parental control [ ] All FTA receivers contain a parental lock feature. DiSEqC switch and motor control [ ] Unlike package receivers promoted for use with a limited number of satellites controlled by an individual pay-TV provider, an FTA receiver is designed to be capable of receiving any free signals from all available satellites visible in a given location. To fully exploit this capability, most FTA receivers will control a motor which can rotate a single dish to view one of any number of multiple satellites.

An alternate approach of pointing a fixed dish (or ) at each satellite to be received (then feeding the individual signals into a remotely controlled switch) is compatible both with standard FTA receivers and the more-restricted pay-TV 'package receiver'. The most common standard for use with FTA receivers is a DiSEqC switch which normally allows automatic selection of signal from four satellites. A simpler two-position remote switch operated by a 22 kHz tone is also occasionally used for North American reception, but this configuration is not compatible with European-style universal LNB's which use the tone internally for band-switching. A antenna may be used with multiple LNB's to receive multiple satellites in various locations over a 40° arc.

Unlike the single parabola of a standard satellite dish antenna (which is best adapted to focus one target satellite to a single point), the toroidal antenna uses a reflector pair to focus multiple signals to a line. Individual adjacent or near-adjacent pairs (such as on 97°W and 101°W) may be received, due to their close proximity, with two LNB's on what otherwise looks geometrically to be a standard parabolic dish. The outputs from these individual LNB's may then be fed through a switch to a receiver, providing access to all signals on both satellites. Electronic program guide [ ] An on-screen program schedule can be accessed that also contains descriptive information about a selected program. The availability and quality of programme guide information varies widely between broadcasters (some provide nothing) and the ability of receivers to collect and store guide listings from multiple sources is also variable.

Receivers with more memory (or storage on external devices such as hard drives) are often, but not always, better equipped to store and retrieve on-screen programme listings. In some cases, a receiver with both satellite and terrestrial tuners will provide on-screen guide support for one mode of operation but not both. PVR functions [ ] A few high-end receivers feature the ability to record programs, pause, and review live TV. Often, a hard drive is not included when the unit is purchased, which allows the user to install any desired.

Many newer units are equipped with a port that allows the user to connect a portable hard drive; at least one unit (the Pansat 9200HD) uses as PVR media storage. Some receivers, such as TripleDragon or Dream Multimedia's -based series, provide interfaces.

This allows the use of to provide PVR-like functions (some of these models also include internal hard drives or USB) and allows the unit to be controlled or updated via network. The use of desktop cards to deploy or terrestrial tuners allows the computer's hard drive and network storage to be used to archive electronic programme guide information and recorded television programming.

Most or all of the base PVR functionality becomes available by default at little or no added cost. MPEG4 and 4:2:2 [ ]. This section needs additional citations for. Unsourced material may be challenged and removed. (October 2009) () Most standard FTA receivers support,, or received as unencrypted from satellites.

Rarely supported by stand-alone FTA receivers, but likely to be supported by FTA tuners for personal computers, are and MPEG2, variants on the MPEG compression algorithm which provide more compression and more colour resolution, respectively. As personal computers handle much of the video decompression in software, any could be easily substituted on the desktop. High-definition television is also beginning to be supported by a limited-number of high-end receivers; at least one high-end stand-alone receiver (the Quali-TV 1080IR) supports both 4:2:2 and HDTV. Is a version of compression used in network feeds such as on (103°W). Some broadcast networks use 4:2:2 encoding for otherwise-unencrypted transmission of sports events to local terrestrial stations, as it provides slightly better colour than the standard 4:2:0 compression. In some cases support for additional standards (such as, and ) will also become necessary to receive a viewable signal.

The use of newer means of modulation and compression is likely to become more widespread for feeds, in order to partially offset the larger amount of transponder space required to deliver high-definition video to television stations. Terrestrial DTV [ ] In countries using the and standards for terrestrial and, a few higher-end receivers provide an option to install terrestrial DVB tuners either alongside or in place of the stock tuner. Dream Multimedia's DreamBox series, for instance, supports this in a few selected models.

In countries using, inclusion of terrestrial tuners in FTA receivers is rare, with one key exception. Some FTA receivers incorporate terrestrial ATSC tuners.

These typically do not support ATSC's unique major. Minor numbering scheme or the on-screen program guide but are capable of displaying (or timeshifting) local HDTV with no loss in detail. Channels from these receivers are numbered using FTA conventions, by which the first channel found is most often arbitrarily given as its number. HDTV [ ] A few high-end receivers feature. Deadly Innocence Scott Burnside Pdf To Word.

In North America, these often include an over-the-air tuner and support. A few HDTV units allow for the addition of a UHF remote control. However, an module can be installed in place of the UHF remote and allows the receiver to decode the format used on most Dish Network high definition programming. These units are superior to for time-shifting HDTV programming, as most DVD units down-convert OTA HDTV signals to standard-definition to match the limitations of the DVD standard. An HDTV FTA receiver with ATSC capability and USB storage can record one channel from a terrestrial or satellite DTV entirely losslessly, although the on-screen guide for terrestrial reception is often limited and viewing or storage of analog channels is not supported. Controversy [ ] Availability of free programming [ ] While significant amounts of programming remain free, there is no assurance to viewers that any individual broadcast currently available free-to-air will remain so. Need For Speed Most Wanted Crack Exe Free Download. Some will inevitably move to incompatible signal formats (such as MPEG,,, or ), change from free to encrypted, move to different satellite locations (often across bands, where reception requires much larger antennae) or shut down entirely.

Many of the signals are backhaul or 'wildfeed' video destined to individual stations, or are feeds to terrestrial transmitters programmed remotely. These were not intentionally created as direct satellite broadcasts to home viewers, but often had been left unencrypted (in the clear) on the assumption that few people were watching. As free-to-air receivers became inexpensive and widely deployed in the 2000s (decade), many of these feeds moved to C band (requiring a huge dish), were encrypted or changed to incompatible modulation or encoding standards which required more advanced receivers, even though the corresponding broadcast may still be in its home community. The onus is on receiver vendors to voluntarily indicate, whenever they use lists of currently available FTA programming for marketing purposes, that free channels frequently may appear, move and disappear, often on a permanent basis, with no advance notice.

One North American example was, once a major source of small local terrestrial stations on free. Equity filed for on December 9, 2008 and most of Equity's terrestrial stations were sold at auction in mid-2009. As many of the stations (such as and ) were sold to and now originate nothing, the corresponding unique free-to-air signals (Galaxy 18, 123°W) are no more. Even where a signal still exists, an incompatible signal format such as that of the feeds (AMC 1 at 103°W, now requires 8PSK, DVB-S2 and HDTV support to receive anything) can remove a channel from virtually all standard FTA receivers. Receiver obsolescence [ ] Many receivers will provide options for hardware expansion (such as to add reception or DVB TV subscription cards) and firmware upgrade (either officially or from nominally third-party sources). Most often, once the individual receiver model is discontinued, this support and expandability rapidly disappears from all sources. The migration of existing feeds to formats such as,, or (which many current receivers do not support) may also result in viewers losing existing free programming as equipment becomes rapidly obsolete.

Unlike digital terrestrial, most standard-definition receivers do not down-convert HD programming and thus produce no usable video for these signals. There have also been incidents where existing receiver designs have been 'cloned' or copied by competing manufacturers; a manufacturer will often reduce support for a widely copied receiver design. In some cases, has been released, ostensibly in the same format as existing third-party firmware, in an attempt to interfere with the further use of a widely cloned receiver's design. Legal issues [ ] FTA receivers are ostensibly designed for free-to-air use but can be adapted for other purposes.

In some jurisdictions, this dual-use nature can cause problems. Thus, combatting piracy involving FTA receivers has been difficult using legal means. • • - the largest source of free ethnic satellite TV in North America • carries a wide range of PBS educational programming •, satellite TV directory, Christian Lyngemark • A website Satscams.com, owned and operated by NagraStar LLC (a joint venture between EchoStar and Kudelski), contains a long list of boasts of lawsuits and litigation against individual Internet Key Sharing end users and receiver manufacturers such as nFusion, Kbox, Viewtech, Sonicview, Freetech and Panarex. • • • - the former home of Equity Broadcasting on FTA DVB-S, now largely vacant External links [ ] • • • (archived, last update October 2008) •.