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Consumer Electronics, IEEE Transactions on

Issue 1 • Date Feb 1991

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Displaying Results 1 - 15 of 15
  • Improving the resolution of selected ADCs

    Publication Year: 1991 , Page(s): 81 - 85
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (288 KB)  

    A technique of increasing the resolution of the counter ramp ADC (analog-to-digital converter) and successive approximation ADC without affecting their speed of operation is proposed. An n-bit simultaneous ADC is used with another m-bit successive approximation ADC or counter-type ADC to realize an (m+n )-bit ADC having the same speed of operation as an m-bit ADC View full abstract»

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  • Video signal processing for HD-VCR using 1/2-inch tape

    Publication Year: 1991 , Page(s): 15 - 21
    Cited by:  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (412 KB)  

    A high-definition VCR using 1/2-in tape has been developed. High-quality pictures are obtained by using a highly precise nonlinear emphasis system, a newly developed time-base corrector, and an automatic equalizer. The bandwidths for luminance and chrominance are 20 MHz and 7 MHz, respectively. The recording time is 63 min. The FM recording method is used, and four-channel PCM (pulse code modulated) audio signals with 20-kHz bandwidth can be recorded as well. This VCR has enough quality for professional use with good cost-effectiveness View full abstract»

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  • A low-cost approach to cellular mobile telephones

    Publication Year: 1991 , Page(s): 32 - 38
    Cited by:  Papers (1)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    A chip-set has been developed which substantially reduces the complexity and cost of cellular mobile phones. The architecture adopted allows the maximum use of VLSI to reduce total component count and minimize power consumption. This architecture is partitioned into five main blocks: an RF subsystem containing the receiver, tuning system, and transmitter; a continuous-time data processing block to handle the cellular data/control channel streams; an analog audio processing block to handle the baseband telephony audio functions; a system control unit to handle the cellular switching protocols and to control the system hardware; and a user interface View full abstract»

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  • Two-dimensional LMS adaptive filters

    Publication Year: 1991 , Page(s): 66 - 73
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (680 KB)  

    A novel two-dimensional least mean square (2-D LMS) algorithm is proposed. This algorithm can converge along both the horizontal and vertical directions of a 2-D plane. In order to compare this algorithm to another 2-D LMS algorithm, both are realized in the form of a 2-D adaptive line enhancer (2-D ALE), and they are applied for to enhancement of images contaminated with noise. The 2-D ALE based on the proposed algorithm does not cause any degradations due to anisotropic processing View full abstract»

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  • Colorimetry for HDTV

    Publication Year: 1991 , Page(s): 1 - 6
    Cited by:  Papers (5)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (388 KB)  

    It is pointed out that high-definition television (HDTV) offers an opportunity to improve color rendition. It is suggested that there are three ways in which the colorimetry of future television systems can be improved. The first is to define the color characteristics of the system completely, making it possible to define quality transcoding into other systems, and correct for all possible displays. A second improvement is to extend the color gamut to take advantage of future display improvements and to fully exploit the color capability of feature films. A third improvement is to include constant luminance operation. The advantages of and problems involved in achieving these improvements are discussed View full abstract»

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  • A combined-transform coding (CTC) scheme for image data compression

    Publication Year: 1991 , Page(s): 45 - 50
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (664 KB)  

    The authors propose a combined-transform-coding (CTC) scheme to reduce the blocking effect due to division of subblocks and to achieve better subjective performance. The proposed CTC scheme is described, and its information-theoretic properties are investigated. A comparison between the CTC scheme and conventional discrete cosine transform (DCT) and discrete Walsh-Hadamard transform (DWHT) schemes was made to demonstrate the performance improvement of the proposed scheme. The advantages of the CTC scheme also include (1) no ringing effect due to the absence of error propagation across block boundaries, (2) no additional computation, and (3) the ability to hold distortion below a certain threshold. In addition, it was found that the idea of combined coding can also be used in noiseless coding View full abstract»

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  • Stereoscopic video movie camera using 300K pixel IT-CCD sensors

    Publication Year: 1991 , Page(s): 39 - 44
    Cited by:  Papers (2)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (524 KB)  

    A novel stereoscopic video movie camera, 3D-CAM, has been developed. It incorporates two eyelike microcamera heads using 300K pixel color IT-CCD (interline-transfer charge coupled device) sensors. The 3D-CAM records right and left images alternately through the two camera heads onto a VHS-C video cassette tape. Viewers see these images on a TV monitor through liquid-crystal shutter glasses, whose shutter action is synchronized with the images, so that the right and left images are mixed in the brain to create fine stereoscopic images. To obtain the best 3-D images, many kinds of new technologies have been developed, including: sequential switching of the right and left image signals by field intervals in camera heads; accurate registration according to the CCD geometrical arrangement; relation between the position of the object and right and left camera head distances; and concourse angle between the subject and two camera heads. Fine color stereoscopic images are easily obtained by the 3D-CAM without two video cameras and two VCRs. Many kinds of applications are expected, such as entertainment, robot eyes, manipulators, simulators, and medical use View full abstract»

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  • A programmable TV sync signal generator

    Publication Year: 1991 , Page(s): 57 - 65
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (380 KB)  

    The author describes an erasable programmable ROM (EPROM)-based TV sync generator design method which provides both flexibility and low cost. The basic idea of the design is to prestore all of the designed sync waveforms in an EPROM and then generate these waveforms by using conventional digital circuits. The generated sync signals' parameters can be programmed easily by using the different prestore codes. The sync signals are so complicated that the EPROM's capacity must be very large if all lines of the waveforms are stored. In order to reduce the required memory space, an iterate-line method is introduced by using the relationships among the sync signals View full abstract»

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  • CPLPS teletext system-a Chinese teletext system with enhanced error-protection and PDI implementation

    Publication Year: 1991 , Page(s): 22 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (428 KB)  

    A new Chinese teletext system based on the compatible extension of NAPLPS (North American Presentation-Level Protocol System) is reported. Three key problems-Chinese character extension, error protection, and PDI (picture description instruction) implementation-are solved. Systematic open-air trial broadcasting on the Sichuan TV station demonstrates that the CPLPS teletext system is reliable and expressive, thus making it a promising candidate for the standard Chinese teletext system View full abstract»

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  • Transient response vs. tuner response with implications for HDTV

    Publication Year: 1991 , Page(s): 7 - 14
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB)  

    Luminance transient responses for an NTSC 2T-edged bar signal and baseband video responses are shown for ten different tuner responses permissible within representative tuner limits. Transient responses are shown to vary from 8% smear to 18% overshoot, primarily due to amplitude and group delay variations from low to medium video frequencies. This indicates the need for improvement if EDTV and HDTV (extended- and high-definition TV) are to meet consumer expectations for image quality. Additional distortion can result from echoes on the transmission line between antenna and tuner, each of which may have a frequency-dependent VSWR (voltage standing wave ratio) exceeding 4.0. The echo on a lossless line would be 36% (-8.9-dB) if VSWRs were frequency independent, and 4.0 at both ends. For a residential installation with 55 ft of 300-Ω twin lead, the first echo would be delayed 140 ns (half cycle of NTSC subcarrier) View full abstract»

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  • A compact TV ghost generator

    Publication Year: 1991 , Page(s): 51 - 56
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB)  

    A TV ghost generator that does not use long cables to achieve the desirable time delay is described. Instead it makes use of a video delay line and two synchronized modulators. The design of the generator is described, and test results are presented. This ghost generator provides a low-cost and convenient-to-use instrument for testing the ghost cancellation capabilities of TVs being developed or produced View full abstract»

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  • Standard sixteen segmented display for Thai numerals

    Publication Year: 1991 , Page(s): 96 - 99
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (148 KB)  

    Eight- and nine-segment numeric display for Thai was proposed previously by Surakampontorn et al. (see ibid., vol.35, no.4, p.840, 1989). A modification that uses only the commercially available 16-segment display is proposed. One advantage of the proposed display system is that standard off-the-shelf display components can be used without the need for the production of custom eight- or nine-segment displays View full abstract»

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  • Coding characteristics of the pixel-adaptive DPCM utilizing the variable-length-codes

    Publication Year: 1991 , Page(s): 74 - 80
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (460 KB)  

    The coding characteristics of a modified DPCM (differential pulse code modulation) method for data compression of still images for digital still cameras are described. In pixel adaptive DPCM, the pixels are classified into eight groups according to the magnitude of the prediction error of preceding pixels, and the prediction error signals of each group are quantized using eight nonlinear quantizers, each of which is designed optimally to each group. The performance of the pixel adaptive DPCM can be improved by utilizing the variable bit-rate scheme. It is shown in an example that the signal-to-noise ratio can be improved to 48 dB by 6 dB at 3.0 b/pixel, that this improvement is due to the relief of the slope overloading at the edges, and that the spectrum of the coding errors is distributed uniformly in the 2-D spatial frequency region View full abstract»

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  • Contextual analysis approach for Arabization of a microcomputer

    Publication Year: 1991 , Page(s): 86 - 95
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (608 KB)  

    The authors describe a contextual analysis algorithm for the analysis of entered Arabic characters that selects a proper shape for them before displaying them on the screen. The 7-bit ASMO 449 code standard and the reduced-character Amtan keyboard are selected for implementing the Arabic system. The analyzer simplifies the user interaction with the Arabic system by reducing the number of shapes of characters to be handled. The Arabic character generator is designed as a font structure based on 8 by 8 dot matrix pixels for different Arabic character shapes View full abstract»

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  • A digital audio signal processor for sound field controls

    Publication Year: 1991 , Page(s): 28 - 31
    Cited by:  Papers (2)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (272 KB)  

    A new digital audio signal processor (DASP) that is suitable for sound field control applications has been developed. An adaptable external memory configuration method is introduced. The device includes a 32-bit arithmetic and logic unit (ALU) and a 32× 24 bit multiplier/accumulator. The processor is designed to optimize sound field controls such as sound field reproduction of concert halls in a listening room or sound position selection to create natural stereo sounds in an automobile. The programmable external memory interface allows various configurations of DRAM to be selected. The DASP with the external memory interface allows implementation of sound field control, equalization, and filtering applications on a single chip. This reduces overall system costs and periods of system development View full abstract»

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Aims & Scope

The main focus for the IEEE Transactions on Consumer Electronics is the engineering and research aspects of the theory, design, construction, manufacture or end use of mass market electronics, systems, software and services for consumers.

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
R. Simon Sherratt, IEEE Fellow
Professor of Consumer Electronics
School of Systems Engineering
The University of Reading
Reading, Berkshire RG6 6AY  U.K.
r.s.sherratt@reading.ac.uk; sherratt@ieee.org
Phone:+44 (0) 118 3788588