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Another sort of CAD more commonly encountered by developers is a CAD connected directly to the serial port of a standard PC Using development environments similar to those used in normal application development, programmers can create code for smart cards, download it into a prototyping card, and in this way create new smart card applications Most major smart card vendors have proprietary Java development environments: Gemplus offers the GemXpresso environment; Schlumberger offers Cyberflex There are many custom command sets for smart cards In fact, there are so many custom environments and they are so specialized that the number of smart card programmers is very small Considering that smart cards are traditionally programmed in platform-specific assembly languages and that each vendor has a different language, the small number of programmers should come as little surprise The situation could be worse, of course.

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The basic idea of FEC is to add redundant information to the original packet stream For the cost of marginally increasing the transmission rate of the audio of the stream, the redundant information can be used to reconstruct "approximations" or exact versions of some of the lost packets Following [Bolot 1996] and [Perkins 1998], we now outline two FEC mechanisms The first mechanism sends a redundant encoded chunk after every n chunks The redundant chunk is obtained by exclusive OR-ing the n original chunks [Shacham 1990] In this manner if any one packet of the group of n+1 packets is lost, the receiver can fully reconstruct the lost packet But if two or more packets in a group are lost, ther receiver cannot reconstuct the lost packets By keeping n+1, the group size, small, a large fraction of the lost packets can be recovered when loss is not excessive However, the smaller the group size, the greater the relative increase of the transmission rate of the audio stream In particular, the transmission rate increases by a factor of 1/n; for example, if n=3, then the transmission rate increases by 33% Furthermore, this simple scheme increases the playout delay because the receiver must receive the entire group of packets before it can playout a group (During a talkspurt, the receiver schedules periodic playback of the chunks based on the worst-case scenario - namely, the first packet in a group is lost within some group This requires the receiver to delay playback of each packet for the time it takes to receive an entire group) The second FEC mechanism to send a lower quality audio stream as the redundant information For example, the sender creates a nominal audio stream and a corresponding low-bit rate audio stream (The nominal stream could be a PCM encoding at 64 Kbps and the lower-quality stream could be a GSM encoding at 13 Kbps) The low-bit rate stream is referred to as the redundant stream As shown in Figure 63-2, the sender constructs the nth packet by taking the nth chunk from the nominal stream and appending to it the (n-1)st chunk from the redundant stream In this manner, whenever there is non-consecutive packet loss, the receiver can conceal the loss by playing out the low-bit-rate encoded chunk that arrives with the subsequent packet Of course, low-bit-rate chunks give lower quality than the nominal chunks; but a stream of mostly high-quality chunks, occasional low-quality chunks and no missing chunks gives good overall audio quality Note that in this scheme, the receiver only has to receive two packets before playback, so that the increased playout delay is small Furthermore, if the low-bit-rate encoding is much less than the nominal encoding, then the marginal increase in the transmission rate is small.

In some cases, asking the user for verification of a missing transaction (resulting in a user query of the secondary database) is warranted or desired; this puts recovery with precision back into the hands of the end user and helps ensure the integrity of the data. In some cases, if a few minutes have gone by between the time of the original transaction and the time the redundant database is available, the user may no longer wish to resume the old transaction. One example is that of a trading floor, in which a user may choose to hold a trade that was not accepted by the primary database if the market has moved adversely during the recovery window. It s better to let the user make this call than to blindly apply the transaction under a different set of environmental conditions.

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