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Consumer Electronics, IEEE Transactions on

Issue 2 • Date May 1990

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Displaying Results 1 - 15 of 15
  • A novel bar matrix approach for electronic display of Hindi characters

    Page(s): 51 - 56
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (292 KB)  

    A bar matrix approach for electronic display of alphanumeric Hindi characters is described. The proposed layout consists of just 32 elements (which include the provision for matras) and thus gives rise to simpler circuits as compared to existing schemes. Schemes for implementing displays using light-emitting diodes (LEDs) or liquid-crystal displays (LCDs) are noted. Details of the CRT display of characters are discussed View full abstract»

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  • Migration of home information system toward ISDN

    Page(s): 103 - 109
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB)  

    The integrated services digital network (ISDN) residential service capabilities that can be accessed through the basic rate interface (BRI) are highlighted. Also presented is an ISDN home information system which would facilitate the evolving as well as developed home product standards. The author discusses wiring alternatives, home information system functional architecture and subsystems, and communication media available for use View full abstract»

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  • Error performance for D-MAC data services

    Page(s): 57 - 65
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    Options for error protection within the D-MAC packet format are discussed. It is proposed that the packet-type byte be encoded using frame error correction (FEC), thereby increasing the robustness of the packet. Once FEC for the packet-type byte has been allocated, the choice of FEC for data broadcasting is limited to block codes whose lengths are integer multiples of the information block length. Three different codes have been found to be suitable and (along with the case of no FEC) this gives four options for encoding data within the D-MAC packet. These are related to the carrier-to-noise ratio, and the calculation is made on the assumption that FM duobinary can be treated as three-state frequency shift keying and that the noise is additive white Gaussian noise View full abstract»

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  • Braille display terminal for personal computers

    Page(s): 121 - 128
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (388 KB)  

    A fully functional Braille display terminal developed for visually handicapped people to access and work with IBM personal computers is described. The hardware and software design required for the fabrication of control circuitry, the Braille character conversion modules, and the Braille display terminal are described. The Braille display system consists of a control unit, a display terminal and a keypad. To minimize the number of devices to be accessed, the special keypad required to issue commands to the display control unit is integrated with the normal PC keypad. The electromechanical components of the BDT comprise (a) a 40-Braille cell unit which displays 40 characters at a time and (b) two separate cells to display the two-digit cursor line number. An 80-character computer screen line is displayed by dividing it into two 40-character lines. The first 40 characters and the line number are displayed first. The subsequent characters are displayed on the user request. The line break is identified by means of a special character. The computer Braille codes as specified by the Singapore Society for the Blind are adopted in the design of the Braille cells View full abstract»

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  • Motion adaptive pro-scan converter with two dimensional contour enhancement

    Page(s): 110 - 114
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (224 KB)  

    To effectively suppress deficiencies associated with the interlaced scanning, which yields a poor result in terms of the vertical picture resolution, a practical motion adaptive pro-scan line interpolator was developed. The system is composed of an intrafield interpolator, an interfield interpolator, three contour compensation filters, and a motion detector. For still pictures, the interpolated lines of the previous field are properly delayed and intermingled with the scanning lines of the actual field, in order to up convert the vertical sampling rate. When moving pictures are present, the scanning lines of the up-converted frames are obtained by switching the outputs of the intrafield interpolator. The progressive commutation between the interfield and intrafield interpolation processes is controlled by a motion detector with a frame averaging filter. In the proposed system, each line averaging filter acts mainly as a vertical low-pass filter which, together with the corresponding horizontal low-pass filter, constitutes the core of the contour compensation circuit View full abstract»

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  • VHF-FM receiver secondary services: RDS to ARI compatibility topics

    Page(s): 92 - 102
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (748 KB)  

    The authors investigate the mutual compatibility of the usual traffic announcement analog secondary broadcasting ARI (auto radio information) service and simultaneous digital secondary service, known as the radio data system (RDS), evaluating cross-interferences in the standard VHF-FM receiver without coherent detection. On the basis of the analysis and computer simulation the authors conclude that full compatibility of the RDS and ARI systems is possible solely by quadrature procedures both at the transmitting and receiving sides. This implies coherent detection at the receiving side of the circuit for both RDS and ARI signals. The compatibility of the already existing ARI receivers (using an envelope detector) with the RDS system is not ideal. The worst case occurs when some broadcast transmitter broadcasts only RDS signals (without ARI signals). The compatibility of an only-ARI receiver for the reception of RDS+ARI signals depends primarily on the bandpass width of the filter for separation of signals and 57-kHz subcarrier View full abstract»

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  • Two dimensional adaptive comb filter for IDTV with constant peak amplitude response

    Page(s): 115 - 120
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (296 KB)  

    A recursive adaptive comb filter structure is proposed that is composed of an infinite impulse response (IIR) filter with a peak amplitude response that is independent of the feedback gain (k). This feature avoids signal overloading in the receiver and in the encoder when the selectivity of the filter is high (k factor is high). Two chrominance and two luminance filter responses, in the vertical/temporal plane, are described. When the frame and line k factors of the luminance filter are adjusted separately, asymmetrical responses are obtained. Similar results hold for the chrominance filter. The asymmetrical response improves the temporal or spatial vertical resolution of the TV picture View full abstract»

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  • Single chip CD decoder

    Page(s): 89 - 91
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (156 KB)  

    A highly integrated compact disc (CD) decoder is described. The chip contains all the decoding functions, digital filtering, bit-stream stereo digital-to-analog (D/A) conversion, and analog post-filtering. The design makes use of a CMOS process that results in its having a single 5-V supply, an extended operating temperature range, and low power consumption to make the IC suitable for portable and inexpensive applications. The chip contains circuitry for CD-decoding, programmable motor control, digital filtering, microcomputer interfacing, and switch capacitor network for stereo right and left channels. The 80-pin QFP packaged IC can withstand an extended temperature range of -40°C to +85°C View full abstract»

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  • True information television (TITV) breaks Shannon bandwidth barrier

    Page(s): 142 - 148
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    Concepts from artificial intelligence and learning theory are proposed for use in a knowledge-based true information TV (TITV) system. In a knowledge-based TV system a store of images is learned prior to transmission. In learn mode an image from a television camera is stored into an encoding list which is then copied to a retrieval list at the receiver. The resulting transmission bandwidth is not dependent on screen size, resolution, or scanning rate but rather only on novelty and movement. The moving portion of the input image is compared with previously learned image sections to generate superpixel codes for transmission. A superpixel may contain any size image section, from single pixel to entire images. Digital superpixel transmission promises near-perfect images for high-definition TV (HDTV) at orders of magnitude lower bandwidth and, if desired, in a virtually unbreakable encryption code View full abstract»

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  • Segmented display for Burmese numerals

    Page(s): 84 - 88
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (160 KB)  

    The layout for an eight segment Burmese numeric display is proposed. A BCD-to-eight segment decoder/driver designed to be used with this numeric display is also presented. The function table of the BCD-to-eight segment decoder is discussed View full abstract»

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  • On dot matrix displays for Arabic text

    Page(s): 76 - 83
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (552 KB)  

    Layouts for all possible shapes of Arabic alphabet characters are proposed for implementation using 5×7 dot matrices. A novel method for character generation is explained that reduces the total number of fonts required, thus reducing the size of the ROM. This system makes possible the display of legible text in its prevailing form. Since numerals present no problem of interconnection and of varying shapes, they are not considered View full abstract»

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  • Controller for vehicle air-conditioning system

    Page(s): 66 - 75
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB)  

    A microprocessor-based controller for a vehicle air-conditioning system is described. It consists of a control unit resident in the vehicle to control the on/off switching of the engine and the air-conditioning unit. The control unit consists of a control panel which serves as a medium for the user to communicate with the microprocessor and a display to provide feedback to the user. A remote control unit with transmission through radio wave is also developed. Various design considerations are discussed, and a system description is given in which the remote control unit and residential control unit are characterized. The RF transmitter and receiver designs, as well as the digital circuitry and system software used, are presented View full abstract»

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  • Motion adaptive field rate upconversion algorithms for 900 lines/100 Hz/2:1 displays

    Page(s): 149 - 160
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (812 KB)  

    An algorithm for motion adaptive field rate upconversion is described. It applies one of two low-pass vertical filters to the source signal, depending on whether the source is moving or static. The theory justifying this approach is also presented. In the case of high-definition multiplexed analog component (HD-MAC) signals, the motion adaptive control can be derived from the transmitted digitally assisted TV data, while for existing standards a motion detector is required. An algorithm for motion detection is also described. To improve the quality of moving images, an additional median filtering algorithm that can be applied after the vertical filtering is presented. The display standard of 900 lines, 100 Hz/2:1 is presented as an engineering compromise, allowing the construction of 100-Hz displays using conventional techniques while avoiding any compromise of the displayed image quality. A motion adaptive field rate upconverter has been constructed that converts either 1250- or 625-line 50-Hz inputs for display at 900 lines, 100 Hz. Initial tests have shown that the concept of a high-quality receiver, as described in the text, is valid in terms of image quality View full abstract»

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  • 2-D analog filters for real time video signal processing

    Page(s): 137 - 141
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (364 KB)  

    A practical hardware design of a two-dimensional (2D) analog filter proposed by M.A. Sid-Ahmed (IEEE Circ. and Syst., vol.36, p.153-4, Jan. 1989) is developed. The structure is implemented using charge coupled device (CCD) analog shift registers and wideband operational amplifiers. The operation of the filter is demonstrated by processing TV video images in real time. The 2D analog approach is evaluated by comparison with a 2D distributed arithmetic digital filter. The analog approach offers realization at lower cost, less power consumption, higher resolution, and inherent true real-time capability independent of filter order View full abstract»

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  • A microprocessor-controlled door lock system

    Page(s): 129 - 136
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    The detailed design of a microprocessor-based door lock system including the hardware design, software functional definitions, and diagnostics is presented. The system is designed in two modules: a door lock controller board, in which all functions necessary for keyless entry at a door are implemented, and a programming board. There is only one such board for the whole dwelling and it has additional hardware such as serial link interface circuitry and a display. The two modules are connected temporarily to perform keycode modification and diagnostic functions using a serial data link. The keycode is a four-character pattern. Authorized users of the dwelling are given this code and are required to enter this pattern via a keypad for entry. The number of integrated circuits used was kept to a minimum (seven are used for the door board). The system uses 2240 B of EPROM, 4 B of EEPROM, and 90 B of RAM. The lock solenoid driver circuitry was significantly reduced by using a solid-state relay, and the system uses 2.4576-MHz crystal. An internal divide-by-four circuit provides a bus speed of 614.4 kHz. This relatively low frequency reduces the system cost by allowing the slowest access memory parts to be used. This speed is adequate for the door lock system operation View full abstract»

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Aims & Scope

The primary purpose for publishing the Transactions of the Consumer Electronics Society is to present to the membership and the engineering community in general, papers on new technology oriented to Consumer Electronics.

 

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Meet Our Editors

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