By Topic

Broadcasting, IEEE Transactions on

Issue 4 • Date Dec 1995

Filter Results

Displaying Results 1 - 7 of 7
  • PSPICE analysis of HF high-power tuned amplifier and comparison to related methods

    Publication Year: 1995 , Page(s): 153 - 157
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (300 KB)  

    Application of the PSPICE program for analyzing HF high-power tuned amplifier (HFHPTA) is described. The new method is compared to other known methods. Calculation results of the balance of power and the coefficient of efficiency, as well as the errors with reference to catalogue values are given for different methods of analysis View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A study on three-dimensional (spatio-temporal) noise characteristics of letterbox EDTV

    Publication Year: 1995 , Page(s): 113 - 120
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (784 KB)  

    The difference between the three-dimensional noise characteristics of the current NTSC and that of the letterbox EDTV has been studied. We have shown that when the letterbox EDTV pictures (main panel) are displayed in the 16:9 aspect area with the same picture height as that of NTSC pictures (4:3), and when the signal levels are the same, the three-dimensional noise power spectrum of the main panel of letterbox EDTV is transformed into a low spatial frequency region with high density, and the total noise power remains unchanged both in NTSC and EDTV. The helper signals which are multiplexed onto the black bands in the top and bottom portions of the screen, generally, increase the total noise power of decoded EDTV signals even if the amplitude of the helper signals is large enough. By applying a three-dimensional weighting function, it is shown that the weighted noise power of the letterbox EDTV becomes larger than that of NTSC. Hence, in order to retain the existing service area after introducing the EDTV broadcasting service, it will be necessary to install noise suppressing measures in the EDTV system View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The development of a high definition television (HDTV) terrestrial broadcasting emission mask

    Publication Year: 1995 , Page(s): 121 - 129
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (748 KB)  

    This paper analyzes the case of HDTV channels, upper and lower, first adjacent to an existing NTSC station assignment and considers the interference from an HDTV adjacent channel, spillover spectra as undesirable co-channel interference into the NTSC channel. A subjective weighting function is developed for random noise interference to NTSC images at the video baseband level. A filter function representing the human visual system at specified viewing distances as a function of image height is developed, first for monochrome, and then extended to color images. The baseband subjective weighting function is modified to include the process of television carrier modulation and demodulation. This carrier modified weighting function is then used to evaluate typical spillover spectra created by high power amplifiers when driven by a modulated digital HDTV signal. BTSC stereo audio (with SAP) is also included in the interference evaluation. Spectral out-of-band spillover limits are established based on the threshold of visibility of the interference as a function of the mileage separation between adjacent channel NTSC and HDTV stations. A high power bandpass filter and band elimination notches are included in the analysis. The results are then applied to two methods of determining spectral emission compliance: measurement of the out-of-band interference spectra with a weighting function, or alternatively, the use of an emission mask View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Correction to" New Theoretical Concept of Thin Electromagnetic Wave Absorber Using Resonant and Scat

    Publication Year: 1995
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (20 KB)  

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • EM field measurements in the vicinity of an antenna park for radiation hazard purposes

    Publication Year: 1995 , Page(s): 130 - 135
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1052 KB)  

    An extensive set of measurements for the purpose of mapping of the EM pollution in the vicinity of an antenna park is given. The EM power density is compared with three international standard limits. Special attention has been paid to residential areas. An increased EM pollution was found in areas where construction of buildings is planned for the future. In view of these plans, reformation of the park and spreading of the antennas have to be done View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A narrowband, high capacity integrated voice/data mobile radio system for dispatch-related broadcast applications

    Publication Year: 1995 , Page(s): 143 - 152
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1088 KB)  

    This paper presents the design and performance analysis of a narrowband, mobile radio system optimized for dispatch-oriented broadcast applications in the 450 and 800 MHz frequency bands. The proposed system is significant since present-generation systems have proven incapable of providing the increased capacity demanded by new data services such as mobile data terminals, automatic vehicle location, and mobile facsimile. The centerpieces of the proposed design are a dynamic multiplexing technique known as packetized data, voice dedicated (PDVD) burst switching, which allows transmission of data within the silence gaps inherent in speech, and a noncausal signal processing technique called lookahead, which provides the data sources with advance knowledge of where the silence gaps will occur. Simulation results are given for two dispatch-oriented broadcast applications with widely differing traffic statistics, showing the flexibility and efficiency of the proposed system. The results show that for either application, the proposed integrated voice/data system can be retrofitted into existing 450 and 800 MHz public and private land mobile radio channels and, compared to conventional voice-only systems, can provide the user with full data services plus a tripling of voice capacity View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electromagnetic field estimation in the vicinity of panel antenna system for FM and TV broadcasting

    Publication Year: 1995 , Page(s): 136 - 142
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (604 KB)  

    The paper presents an approximate numerical technique for the estimation of the EM field distribution in the vicinity of broadcast FM and TV antenna systems. This technique is needed to estimate the health hazards and other environmental problems. It is based on the geometrical factors of the system, the directional properties of the panel used, the power and voltage phases supplying the panels and the electrical parameters of the ground View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

IEEE Transactions on Broadcasting covers the field of broadcast technology, including the production, distribution, transmission, and propagation aspects of broadcasting.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Yiyan Wu
Communications Research Ctr Canada