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Broadcasting, IEEE Transactions on

Issue 4 • Date Dec 1996

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Displaying Results 1 - 6 of 6
  • MF AM asymmetric vertical dipole measurements

    Page(s): 333 - 339
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1384 KB)  

    A medium frequency AM asymmetric vertical dipole for a 50 kW broadcast station was constructed during June 1994. This kind of vertical dipole operates without the 120 wires classical artificial ground plane. In order to analyze its behavior extensive measurements of the near and far radiated fields were carried out. Those results were compared to standard monopoles to have a better understanding of the performance and efficiency parameters. The nocturnal service area was determined in order to observe the antenna high angle radiation. Comparison with the previous monopole served to confirm that substantial improvements are obtained with this new installation, being both antennas of similar height View full abstract»

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  • The in-band characteristics of the vestigial side band emitted signal for ATV digital terrestrial broadcasting

    Page(s): 298 - 304
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    The characteristics of the signal emitted from the vestigial side band ATV digital terrestrial broadcast transmitter is examined as regards the parameters which determine the quality of the broadcast signal. Only inband characteristics are examined. The band edge characteristics-both upper and lower-are defined in terms of the frequency domain and the resulting time domain data pulse shape is examined. Intersymbol interference affecting eye closure is treated using an example of a transmission line VSWR caused by antenna reflections. The error vector magnitude is shown to fully characterize the quality of the emitted signal. Included in the error vector magnitude is the above intersymbol interference caused by linear distortion such as echoes, channel magnitude ripple and tilts which have not been removed by pre-equalization. Also included are noise-like components caused by non-linear high power amplifiers and random noise caused by transmitter circuits using solid-state devices and electron beams. An error vector magnitude limit value is proposed for the terrestrial broadcast signal View full abstract»

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  • A rhombic antenna case study

    Page(s): 314 - 322
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (620 KB)  

    A NASA research program has been instituted which seeks to replace the present hydraulic and pneumatic control systems on commercial aircraft with electro-optical and electro-mechanical devices. This new technology should be lighter, cheaper, and easier to maintain, but may be susceptible to high-amplitude externally-generated electromagnetic fields. To determine the expected level of interference, a rhombic antenna utilized by the Voice of America for international short-wave broadcasting was modeled using NEC-4D. The predicted gain and take-off angle were calculated, along with the electric-field intensity at several data points located near the ground View full abstract»

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  • A new digital implementation of the RDS in the FM stereo

    Page(s): 323 - 327
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    We deal with some of the main blocks which consist a stereophonic RDS modulation system. As such we consider the 19 kHz pilot tone of the FM stereo, the 38 kHz subcarrier modulated by the difference of the two stereo channels and the 57 kHz subcarrier of the RDS digital signal. Also, a digital substitute of the biphase signal generator required for coding and shaping of the RDS data preceding the balanced modulator, is considered. The substitution of the balanced modulator by a multiplying DAC is another consideration. The synthesis of the three carriers takes place by a multiplexed (triple) direct digital synthesizer (DDS). The multiplexed synthesizer can be considered independently for the generation of multiple frequencies View full abstract»

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  • Skyplex: distributed up-link for digital television via satellite

    Page(s): 305 - 313
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (836 KB)  

    This paper introduces a novel concept of distributed up-link for digital television via satellite. A number of broadcasters situated in different geographical locations can independently have direct access to the satellite for multiplexing and direct-to-home transmission. The system utilises advanced on-board processing techniques for the multiplexing of signals into a single multiprogramme transport stream. The down-link transmission is in accordance with the European standard for digital video broadcasting View full abstract»

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  • Characteristics of upstream channel noise in CATV-networks

    Page(s): 328 - 332
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    Currently there is a growing demand towards interactive multimedia services using high capacity hybrid fibre-coax (HFC) CATV-networks. With regards to the realisation of upstream traffic, many problems occur with the accumulation of noise due to the tree and branch architecture of the coaxial access network. The properties of the spectral noise signature resulting from the accumulation of noise have been studied by performing measurements in two major CATV-networks in Europe. Serious noise accumulation was found with levels up to resp. -70 dBm and -50 dBm in the two networks. Interference from short-wave broadcasting caused interference levels up to resp. -60 dBm and -40 dBm. We show that upstream noise is time dependent, and is not only caused by CATV-network subscribers View full abstract»

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Aims & Scope

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

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Editor-in-Chief
Yiyan Wu
Communications Research Ctr Canada