Video on phone lines: technology and applications

Lin, Dekang; Chen, C.-T.; Hsing, T.R.

doi:10.1109/5.364467

Cited by 17 publications

(3 citation statements)

References 75 publications

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“…To this end, recently, there has been tremendous increase in demand for digital video owing to the relative ease of transmission, access, storage and manipulation of visual information in a digital format rather than analog. The variety of applications for digital video include HDTV, home television theatre, Photo-CD, CD-ROM video games, video on demand (VOD), medical imaging, scientific visualization, video conferencing, multimedia mailing, remote video surveillance, news gathering, and networked database services [13].…”

Section: Introductionmentioning

confidence: 99%

<title>Software-based H.263 video encoder using a cluster of workstations</title>

1997

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In this paper, we present a software based H.263 video encoder using a cluster of workstations. H.263 is an international standard for video coding using low bitrate communication. Due to a high computational cost, a real-time software based codec (specially encoder) is impossible to implement using currently available single-processor systems. Parallel processing using multiple computers, however, is a natural way of implementing a software-based real-time codec. A cluster of workstations is analogous to a parallel machine consisting of several processors each with its own memory and is a costeffective computing platform. The workstations connected via an ATM switch use Message Passing Inteiface (MPI) library for communication. Our implementation is based on a data-parallel approach in which parallelism is exploited within each frame of the video on a macroblock basis. Since the encoder is implemented in software, it provides flexibility to enhance performance through modifications and improvements in various components. The encoder can be used with various numbers of processors connected via any physical hardware topology, and its performance scales accordingly. It provides options for user-defined parameters such as the number of processors, the size of motion search window, quantization parameter, bit-rate, etc. The experimental results indicate that our approach is suitable for real-time applications such as video telephony on conventional analog telephone lines. An encoding rate of 30 frames/sec. (with QCIF format) is achieved using 12 workstations.

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Section: Introductionmentioning

confidence: 99%

<title>Software-based H.263 video encoder using a cluster of workstations</title>

1997

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“…It is for this reason that numerous power reduction techniques have been proposed starting at the algorithmic-level [1]- [4], architectural level [5], logic level [6], and the circuit level [1]. These techniques are currently being applied to develop low-power and high-speed transceivers for applications such as asymmetric digital subscriber loop (ADSL) [7], high-speed digital subscriber loop [8], and ATM-LAN [9] to achieve high bit rate digital communication over bandlimited channels.…”

Section: Introductionmentioning

confidence: 99%

A low-power phase-splitting adaptive equalizer for high bit-rate communication systems

Hedge

Shanbhag²

1999

IEEE Trans. Signal Process.

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A low-power architecture for a phase-splitting passband equalizer (PSPE) is proposed in this correspondence. The Hilbert relationship between the in-phase and quadrature-phase equalizers in the PSPE is exploited to develop the proposed architecture. It is shown via analysis and simulations that in a 51.84-Mb/s ATM-LAN environment, the proposed receiver results in 1) a net saving in power if the length of the Hilbert filter is less than 130, and 2) a saving of up to 20% can be achieved with a degradation in signal-to-noise ratio of less than 0.5 dB.

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“…D IGITAL communications systems are currently being developed for high-bit rate transmission over bandlimited channels. These applications include asymmetric digital subscriber loop [8], [22] (ADSL), high-speed digital subscriber loop (HDSL) [20], [26], [45], very high-speed digital subscriber loop (VHDSL) [7], [17], ATM-LAN [18] and interactive multimedia television (IMTV) [19], high-density magnetic recording [9], wireless systems [1], and digital highdefinition TV (HDTV) transmission [29], [30]. In each of these applications, the bandlimited nature of the channel and the required performance levels necessitate the use of highly complex digital communications algorithms.…”

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confidence: 99%

Low-power adaptive filter architectures and their application to 51.84 Mb/s ATM-LAN

Shanbhag

Goel

1997

IEEE Trans. Signal Process.

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In this paper, we present low-power and highspeed algorithms and architectures for complex adaptive filters. These architectures have been derived via the application of algebraic and algorithm transformations. The strength reduction transformation is applied at the algorithmic level as opposed to the traditional application at the architectural level. This results in a power reduction by 21% as compared with the traditional cross-coupled structure. A fine-grained pipelined architecture for the strength-reduced algorithm is then developed via the relaxed lookahead transformation. This technique, which is an approximation of the conventional lookahead computation, maintains the functionality of the algorithm rather than the input-output behavior. Convergence analysis of the proposed architecture has been presented and supported via simulation results. The pipelined architecture allows high-speed operation with negligible hardware overhead. It also enables an additional power savings of 39 to 69% when combined with power-supply reduction. Thus, an overall power reduction ranging from 60-90% over the traditional cross-coupled architecture is achieved. The proposed architecture is then employed as a receive equalizer in a communication system for a data rate of 51.84 Mb/s over 100 m of UTP-3 wiring in an ATM-LAN environment. Simulation results indicate that speedups of up to 156 can be achieved with about a 0.8-dB loss in performance.

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Video on phone lines: technology and applications

Abstract: This paper reviews the telephone loop plant characteristics, current DSL (digital subscriber line) technologies, recent efforts in video coding standards, and the interrelationship between DSL technologies and visual communications over subscriber lines. In

Cited by 17 publications

References 75 publications

<title>Software-based H.263 video encoder using a cluster of workstations</title>

<title>Software-based H.263 video encoder using a cluster of workstations</title>

A low-power phase-splitting adaptive equalizer for high bit-rate communication systems

Low-power adaptive filter architectures and their application to 51.84 Mb/s ATM-LAN

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