A compact luminaire consisting of a 270-W metal halide lamp and a new light shutter using a composite film of liquid crystal and polymer, which can operate in the wide range from room temperature to more than 100°C, has been developed for TV-lighting. The illuminance can be controlled approximately from 100 lux to 10000 lux by the voltage applied to the light shutter. The high-speed response (3 ms) of the light shutter allows a stroboscopic lighting effect to be obtained by applying a pursed voltage. A new lighting effect is also achieved by modulating the high-intensity light by electrical sound signal. This compact lighting system will be useful for various applications such as TV or movie locations, stages, and outdoor exhibitions.

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A new algorithm is developed for an automatic equalizer system using transversal filter techniques. The tap-gain coefficients of a transversal filter can be obtained by non-iterative calculation by simply calculating several continuous sampling values of the waveform response of a single pulse. The relationship between number of taps of the transversal filter and the expected equalization accuracy of the transmission line can be determined easily. As a result, this algorithm will lead to small and simple automatic equalizer systems applicable to MUSE decoders.

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This paper describes a method of estimating the service area of a TV broadcast, using the height of the land and the database of the TV broadcasting station. As an example we use it to optimize the position and strength of a new TV station. Design requirements for allocating digital audio broadcasting (DAB) using the TV band are also given. Examples of the calculated coverage are presented.

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