Apparatus for calculating amplitude values
AssigneesTokyo Shibaura Denki Kabushiki Kaisha, Tokyo Denryoku Kabushiki Kaisha
InventorsFumio Andow, Tetsuo Matsushima, Minoru Iwasaki
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Abstract
The amplitude value of a sinusoidal wave is calculated by operating means which processes absolute values of two data samples which are sampled from the sinusoidal wave at two points spaced 90.degree. electrical degrees apart thereby producing an electrical signal proportional to the amplitude value. The operation means comprises a comparator, a combination of an adder and a subtractor, or a combination of a comparator and an adder. The output of the comparator or the combination is multiplied with a predetermined coefficient and then added together to produce said signal.
Claims5
An apparatus for calculating the amplitude value of a sinusoidal wave comprising a terminal for receiving signals representing absolute values of two data samples which are sampled from said sinusoidal wave at two points spaced 90.degree. electrical apart by a sampling frequency which is an integer multiple of the frequency of said sinusoidal wave, and operating means coupled to said terminal for receiving said signals representing absolute values of said two data samples and for producing therefrom an electrical signal which is proportional to the amplitude of said sinusoidal wave.
Dependencies are inferred from the claim text.