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keyboard selection ca for telephones with electron emission of pulses decadici interchangeable with the disc com binatore
keyboard selection ca for telephones with electron emission of pulses decadici interchangeable with the disc com binatore
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机译:键盘选择卡,适用于带有脉冲电子发射的电话,可以与光盘组合器互换
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摘要
In order to enable the transmission of digital pulses under the control of a pushbutton-type call-number selector from a dial-equipped subscriber station, the output leads of a keyboard are connected on the one hand to a circulating memory, working into a pulse generator, and on the other hand to a timing network which responds to the depression of any pushbutton on the keyboard with emission of an enabling pulse making the memory receptive to the selected code combination. The timing network includes a delay network which briefly retards the enabling pulse to prevent the storage of spurious signals in response to transient energization of an output lead of the keyboard.
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