Mischievous/wrong telephone call preventing machine

Abstract

Abstract PURPOSE:To prevent the mischievous/wrong telephone call by providing a function to prevent the bell of a telephone from being rung as long as the calling is executed in a frequency more than the set frequency. CONSTITUTION:A mischievous/wrong telephone call preventing machine 3 is installed to a telephone set input line 2, and when it is called, a ringer detecter 4 detects a ringer, and a count-up is executed by a counter 5. A counted result is always compared with a set value by a comparator 6, and driving a ringer a ringer generator 7 when the value is made into the set value or above, the bell of a telephone set 1 rung. Thus, since the bell of the telephone set is not rung as long as the calling is executed at the set value or above, even when a third party, who does not know the set value, executes the call, a called party does not answer, the third party gives up the call is course, and thereby, the mischievous/wrong call can be prevented.

Inventors

• 👤 Toyoaki Inoue
• 👤 井上　豊明

Bibliographic Details