Selective calling circuit employing controlled power supply ther

Details Selective calling circuit employing controlled power supply ther Selective calling circuit employing controlled power supply ther

1977-11-14

1979-04-24

Heyman, John S.

328119, 328167, 179 84VF, 179 84SS, H03K 1726, H03K 518

Patent

active

041514726

ABSTRACT:
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.

REFERENCES:
patent: 3539932 (1970-11-01), Briggs
patent: 3696252 (1972-10-01), Chapman
patent: 3760289 (1973-09-01), Hurtig
patent: 3838348 (1974-09-01), Pezzutti
patent: 4039958 (1977-08-01), Krueger

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