Typical coding schemes for magnetic or optical recording usually consist of two coding stages, error correcting coding (ECC) followed by line or modulation coding. Two methods are presented to design a line code with ...
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Typical coding schemes for magnetic or optical recording usually consist of two coding stages, error correcting coding (ECC) followed by line or modulation coding. Two methods are presented to design a line code with error correcting capability. Both methods modify the linear error-correcting codes so that they satisfy the runlength constraints of runlength-limited (RLL) sequences. Through these methods we construct combined ECC/RLL codes with different runlengths. The first method utilizes linear combination of ECC codewords with a modification vector. The second method uses two-dimensional code to design the required ECC/RLL code. Both methods are basically dependent on binary operations and minor changes to the ECC coding/decoding circuitry are required. Asymptotic upper bound on the maximum runlength for both methods is found and the performance of the proposed ECC/RLL codes with conventional multistage cascaded schemes of ECC and RLL is also studied.
This paper described a new high-speed search method based on newly introduced conditions holding the relationship among tape speed, drum rotation speed and number of recording tracks per frame for good quality images.
ISBN:
(纸本)0780308433
This paper described a new high-speed search method based on newly introduced conditions holding the relationship among tape speed, drum rotation speed and number of recording tracks per frame for good quality images.
Error resiliency is the ability to tolerate uncorrectable errors with graceful quality degradation. This paper investigates error resiliency approaches applied to wavelet compression of images. The results show that t...
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Error resiliency is the ability to tolerate uncorrectable errors with graceful quality degradation. This paper investigates error resiliency approaches applied to wavelet compression of images. The results show that the mid-range subbands take the lion's share of the ECC redundancy bits, and that the expected reconstructed data quality is higher than that of uniform error protection.
An approach is described for checking the methods of a class against a full specification. It shares with traditional model checking the idea of exhausting the entire space of executions within some finite bounds, and...
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ISBN:
(纸本)1595932631
An approach is described for checking the methods of a class against a full specification. It shares with traditional model checking the idea of exhausting the entire space of executions within some finite bounds, and with traditional verification the idea of modular analysis, in which a method is analyzed, in isolation, for all possible calling contexts. The analysis involves an automatic two-phase reduction: first, to an intermediate form in relational logic (using a new encoding described here), and second, to a boolean formula (using existing techniques), which is then handed to an off-the-shelf SAT solver. A variety of implementations of the Java Collections Framework's List interface were checked against existing JML specifications. The analysis revealed bugs in the implementations, as well as errors in the specifications themselves. Copyright 2006 ACM.
This paper presents an error correcting adaptive decoding dual-mode algorithm as it is adapted to the Continuous Phase Frequency Shift Keying (CPFSK) modulation. The dual-mode error correcting algorithm consists of tw...
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This paper presents an error correcting adaptive decoding dual-mode algorithm as it is adapted to the Continuous Phase Frequency Shift Keying (CPFSK) modulation. The dual-mode error correcting algorithm consists of two modes which utilizes the maximum likelihood decoding technique and the burst-error detection scheme. The first mode is the random error correcting mode, which is the Viterbi decoder, and the second mode is the burst-error correcting mode that retrieves the information bits from the (L+m) delayed signal values of the received signals. The dual-mode adaptive decoder nominally operates as a Viterbi decoder and switches to time diversity error recovery, the burst-error correcting mode, whenever the decoder detects an incorrigible error pattern. The experimental results from the computer simulation demonstrate the performance of the algorithm and verify the theoretical results.
Spotty byte error control codes are very effective for correcting / detecting errors in semiconductor memory systems using recent high-density RAM chips with wide I/O data, e.g., 8, 16, or 32 bits. A spotty byte error...
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LLMs trained in the understanding of programming syntax are now providing effective assistance to developers and are being used in programming education such as in generation of coding problem examples or providing co...
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In non-strict languages such as Haskell the execution of individual expressions in a program significantly deviates from the order in which they appear in the source code. This can make it difficult to find bugs relat...
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Digital magnetic recording/playback systems usually require both runlength-limited (RLL) coding and error correction coding (ECC), and these two steps have typically been performed independently, although various meth...
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ISBN:
(纸本)0780318269
Digital magnetic recording/playback systems usually require both runlength-limited (RLL) coding and error correction coding (ECC), and these two steps have typically been performed independently, although various methods of combining them have recently appeared. The recent development of two-dimensional modulation codes, which meet runlength constraints using several parallel recording tracks, has significantly increased the capacity of such channels. In this paper, we apply single-track coding ideas to these two-dimensional constraints, and exploit the increased capacity to achieve good error-correcting ability at the same rate as common non-error-correcting one-dimensional codes.
We show that for a code used for error detection or combined error correction and detection in the binary symmetric channel, the probability of an undetected error can have several local maxima. In particular, we cons...
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We show that for a code used for error detection or combined error correction and detection in the binary symmetric channel, the probability of an undetected error can have several local maxima. In particular, we construct a code with three local maxima in (0, 1/2), a code with five local maxima in (0, 1);and a linear code with two local maxima in (0, 1/2) and a linear code with three local maxima in (0, 1).
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