Schwartz, Jeffery, Schwaab, Mack, Blumenthal & Koch
Selective calling circuit employing controlled power supply therefor
 In a selective calling circuit including a band-pass filter which may be constituted by an active filter, and a power source for energizing the filter, a control signal is generated which has a predetermined duration in accordance with the output of the band-pass filter at a point of time whereat the output of the band-pass filter reaches a predetermined level. In response to the control signal, there is established a state in which the center frequency of the band-pass filter can be changed, and the output of the power source is changed from a first level to a second level for a period of time substantially corresponding to the predetermined duration of the control signal. At the aforementioned first level, the band-pass filter may be energized, while at the second level, it may be deenergized. 
Kokusai Electric Company, Ltd.
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G01R G08B G01R
inventional inventional inventional
Tsuneo Hiroshi Yukio Jouji Takazo Eiji Hiroshi Junichi
Kitamura Noguchi Ueno Tanaka Takahashi Watanabe Yamada Onozawa