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IEEE Journal on Selected Areas in Communications

Issue 1 • Date Jan 1992

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Displaying Results 1 - 24 of 24
  • Signal processing for future home-use digital VTR's

    Publication Year: 1992, Page(s):73 - 79
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The author considers, mainly from the viewpoint of signal processing technologies, the current efforts for future home-use digital videotape recorders (VTRs). Recording technologies for future home-use digital VTRs are reviewed with respect to both current TV and HDTV systems. High-density recording and bit rate reduction are the major technologies needed for digital video recording with small cas... View full abstract»

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  • Professional HDTV digital recorder

    Publication Year: 1992, Page(s):80 - 85
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    Some of the essential technology for record/playback systems in professional HDTV digital recorders is described. The full bandwidths of 1125/60 HDTV signals (30 MHz for luminance and 15 MHz each for the two color difference signals) were recorded. An 8-8 mapping channel code and integrated detection were used. A special phase locked loop (PLL) to cope with picture search functions was developed. ... View full abstract»

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  • On the cutoff rate of a discrete memoryless channel with (d, k)-constrained input sequences

    Publication Year: 1992, Page(s):233 - 241
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    The cutoff rate of a discrete memoryless channel whose output sequences are from a (d, k) encoder is investigated. A rational rate (d, k) encoder is considered as a finite state machine and maximum-likelihood decoding is used to compute the cutoff rate. Some commonly used (d, k) codes, such as the rate 1/2 (1, 3) code with a two-state encoder, ... View full abstract»

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  • Data compression systems for home-use digital video recording

    Publication Year: 1992, Page(s):97 - 121
    Cited by:  Papers (8)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2224 KB)

    The authors focus on image data compression techniques for digital recording. Image coding for storage equipment covers a large variety of systems because the applications differ considerably in nature. Video coding systems suitable for digital TV and HDTV recording and digital electronic still picture storage are considered. In addition, attention is paid to picture coding for interactive systems... View full abstract»

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  • Bit rates in audio source coding

    Publication Year: 1992, Page(s):86 - 96
    Cited by:  Papers (19)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (984 KB)

    The goal is to introduce and solve the audio coding optimization problem. Psychoacoustic results such as masking and excitation pattern models are combined with results from rate distortion theory to formulate the audio coding optimization problem. The solution of the audio optimization problem is a masked error spectrum, prescribing how quantization noise must be distributed over the audio spectr... View full abstract»

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  • Finite-state modulation codes for data storage

    Publication Year: 1992, Page(s):5 - 37
    Cited by:  Papers (138)  |  Patents (61)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2876 KB)

    The authors provide a self-contained exposition of modulation code design methods based upon the state splitting algorithm. They review the necessary background on finite state transition diagrams, constrained systems, and Shannon (1948) capacity. The state splitting algorithm for constructing finite state encoders is presented and summarized in a step-by-step fashion. These encoders automatically... View full abstract»

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  • Maximum entropy charge-constrained run-length codes

    Publication Year: 1992, Page(s):242 - 253
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    The authors present a study of run-length-limiting codes that have a null at zero frequency or DC. The class of codes or sequences considered is specified by three parameters: (d, k, c). The first two constraints, d and k, put lower and upper bounds on the run-lengths, while the charge constraint, c, is responsible for the spectral null. A desc... View full abstract»

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  • Jitter model and signal processing techniques for high-density optical data storage

    Publication Year: 1992, Page(s):201 - 213
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (968 KB)

    The author discusses a jitter model and signal processing techniques for data recovery in pulse width modulation (PWM) optical recording. A high-speed counter clock is used to convert time marks to amplitude marks, and signal processing techniques are used to minimize jitter according to the jitter model. The jitter model considered takes into account jitter from both the write and read processes,... View full abstract»

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  • A 130 Mb/s compact HDTV codec based on a motion-adaptive DCT algorithm

    Publication Year: 1992, Page(s):122 - 129
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1020 KB)

    The authors describe the principle and implementation of a 130 Mb/s compact HDTV codec based on a motion-adaptive DCT (discrete cosine transform) algorithm. They describe a data compression algorithm using motion-adaptive (motion processing over 5 or 10 frames) intrafield two-dimensional (8×8) DCT coding and block-adaptive quantization with eight modes which is suitable for recording systems... View full abstract»

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  • Two-dimensional modulation codes

    Publication Year: 1992, Page(s):254 - 266
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    A new class of run-length-limited codes in introduced. These codes are called two-dimensional or multitrack modulation codes. Two-dimensional modulation codes provide substantial data storage density increases for multitrack recording systems by operating on multiple tracks in parallel. Procedures for computing the capacity of these new codes are given along with fast algorithms for implementing t... View full abstract»

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  • Channels and codes for magnetooptical recording

    Publication Year: 1992, Page(s):57 - 72
    Cited by:  Papers (14)  |  Patents (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1576 KB)

    The author outlines the technology used in the optical recording channel concentrating on magnetooptical recording and describes some of the major formats, codes, and data detection methods which are being developed. A sophisticated model of the optical recording channel was used as a way to make fair comparisons of these candidates, without skewing the results because of different disk or drive q... View full abstract»

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  • New networks for perfect inversion and perfect reconstruction

    Publication Year: 1992, Page(s):129 - 137
    Cited by:  Papers (66)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    The authors present a new network structure that realizes perfect inversion networks (PINs) and perfect reconstruction networks (PRNs). In some applications, such as transform source coders, it is important that the cascade of the forward and the inverse transform give the identity exactly (perfect inversion), although the coefficients and the intermediate results are quantized. In subband coders,... View full abstract»

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  • An all-digital bit detector for compact disc players

    Publication Year: 1992, Page(s):191 - 200
    Cited by:  Papers (7)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (884 KB)

    A bit detector is described which is suitable for integration using digital VLSI technology. In the bit detector the signal is sampled at a fixed clock frequency which is not related to the bit rate of the input signal. The incoming bits are detected by comparing the digitized input signal with the output of an all-digital phase-locked loop (PLL), which regenerates the bit clock that is present in... View full abstract»

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  • Combined equalization and coding for high-density saturation recording channels

    Publication Year: 1992, Page(s):168 - 181
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (980 KB)

    Combined equalization and coding approaches which significantly outperform previous techniques are presented for the binary Lorentzian channel with additive Gaussian noise. The authors develop a technique based on the concatenation of standard trellis codes with an equalization code and a block decision feedback equalizer (BDFE). Signal sets for the trellis code are generated by partitioning BDFE ... View full abstract»

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  • A 128 Kb/s Hi-Fi audio codec based on adaptive transform coding with adaptive block size MDCT

    Publication Year: 1992, Page(s):138 - 144
    Cited by:  Papers (17)  |  Patents (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    A Hi-Fi audio codec with an improved adaptive transform coding (ATC) algorithm is presented using digital signal processors (DSPs). An audio signal with a 20 kHz bandwidth sampled at 48 kHz is coded at a rate of 128 kb/s. The algorithm utilizes adaptive block size selection, which is effective for preecho suppression. A modified discrete cosine transform (MDCT) with a simple window set is employed... View full abstract»

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  • Prefix-synchronized run-length-limited sequences

    Publication Year: 1992, Page(s):214 - 222
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    In digital recorders, the coded information is commonly grouped in large blocks, called frames. The authors concentrate on the frame synchronization problem of run-length-limited sequences, or (d, k) sequences. They commence with a brief description of (d , k)-constrained sequences, and proceed with the examination of the channel capacity. It is shown that for c... View full abstract»

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  • A PRML system for digital magnetic recording

    Publication Year: 1992, Page(s):38 - 56
    Cited by:  Papers (185)  |  Patents (172)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1592 KB)

    The realization of a digital recording system using partial-response class-IV signaling with maximum-likelihood sequence detection (MLSD) is described. To perform MLSD at the high data rates encountered in recording systems, a simple implementation of the Viterbi detector based on a difference-metric algorithm is developed. Decision-directed schemes for gain control and timing recovery, for tracki... View full abstract»

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  • Trellis codes for partial-response magnetooptical direct overwrite recording

    Publication Year: 1992, Page(s):182 - 190
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    The authors present conditions on the error sequences between channel input sequences which guarantee certain lower bounds on the free Euclidian distance at the output of a partial-response (PR) class I or II channel. From these expressions, trellis codes are derived which improve performance of binary signaling over noisy PR channels with reduced complexity maximum-likelihood sequence detection. ... View full abstract»

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  • A simple continuous-time equalizer for use in magnetic storage read channels

    Publication Year: 1992, Page(s):289 - 299
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    A four-pole continuous-time equalizer has been developed to minimize the error rate in rigid-disk magnetic storage channels employing peak detection at high recording densities. The design process consisted of two parts. A nominal model of the disk drive characteristics in the time and frequency domains was obtained from digitized waveforms at the output of a read-head amplifier in a disk drive sy... View full abstract»

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  • SNR merits of binary modulation codes in equalized digital recording systems

    Publication Year: 1992, Page(s):157 - 167
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    For a digital recording system with a binary modulation encoder and a linearly dispersive channel with additive noise, the author determines optimum mean-square performance of the linear, partial-response, and decision-feedback equalizers. The analysis revolves around the power spectral density A(Ω) of the code and the folded signal-to-noise ratio X(Ω) of the channel. The latt... View full abstract»

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  • Simulated performance of analog Viterbi detectors

    Publication Year: 1992, Page(s):277 - 288
    Cited by:  Papers (11)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    The reasons for pursuing analog implementations of the Viterbi algorithm for detection are presented. Some of the tradeoffs to be considered in choosing an analog architecture are discussed, and a suitable architecture for investigation is given. Simulation results based on the chosen architecture are presented and clearly show that analog implementations of the maximum likelihood sequence detecto... View full abstract»

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  • Bounding the capacity of saturation recording: the Lorentz model and applications

    Publication Year: 1992, Page(s):145 - 156
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    The authors consider the problem of bounding the information capacity of saturation recording. The superposition channel with additive Gaussian noise is used as a model for recording. This model says that for a saturation input signal, x(t) (i.e., one that can assume only one of two levels), the output can be expressed as y(t)=x˜(t)+... View full abstract»

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  • An error-correction scheme for a helical-scan magnetic data storage system

    Publication Year: 1992, Page(s):267 - 276
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (876 KB)

    An error-correction scheme for a helical-scan magnetic recording system is presented. The system consists of a commercial VHS video cassette recorder with the front-end electronics adapted for high-speed digital recording. Error statistics have been collected and show a bursty error recording channel both within each track and from track-to-track. The proposed error-correction scheme uses interlea... View full abstract»

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  • Shift error propagation in 2, 7 modulation code

    Publication Year: 1992, Page(s):223 - 232
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    The authors analyze how shift errors propagate in a particular run-length limited (RLL) modulation code that is widely used in modern high-density data storage machines. More specifically, the probability that either a one or two byte burst error in the user data will result from an arbitrary channel data shift error is calculated. The authors consider the case in which the spatial recording densi... View full abstract»

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Aims & Scope

IEEE Journal on Selected Areas in Communications focuses on all telecommunications, including telephone, telegraphy, facsimile, and point-to-point television, by electromagnetic propagation.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Muriel Médard
MIT