System for monitoring dialled telephone numbers
First Claim
1. A system for monitoring numbers dialled over a telephone line the system comprising at least one recording means for sensing dial pulses representative of numbers dialled as well as pulses bearing no relationship to to said numbers dialled on a monitored telephone line and for recording each of the sensed pulses on a recording medium, and processing means for playing-back the recorded pulses on the recording medium, for analysing the pulses recorded thereon to determine the numbers dialled on the monitored line and for producing a display of numbers dialled.
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Accused Products
Abstract
A system for monitoring dialled numbers is disclosed which provides a subscriber with a record of numbers dialled over his telephone line or lines. The system provides a monitoring unit inductively coupled to each line which tapes the dial pulses as they are dialled. Aslo included is a control processing unit which processes the individual tapes to provide a written record. The system thus eliminates the need for duplicating costly equipment such as discriminators and printers at each line.
53 Citations
23 Claims
- 1. A system for monitoring numbers dialled over a telephone line the system comprising at least one recording means for sensing dial pulses representative of numbers dialled as well as pulses bearing no relationship to to said numbers dialled on a monitored telephone line and for recording each of the sensed pulses on a recording medium, and processing means for playing-back the recorded pulses on the recording medium, for analysing the pulses recorded thereon to determine the numbers dialled on the monitored line and for producing a display of numbers dialled.
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20. A recording unit for use in a system for monitoring numbers dialled over a monitored telephone line, the recording unit comprising:
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means for constraining a portion of the individual conductors of the telephone line in an untwisted state; an inductive pick-up for sensing signals in said portion of the monitored telephone line; recording means for recording pulses sensed by the pick-up; and an automatic control circuit for starting the recording means at the beginning of a call on the monitored telephone line and for stopping the recording means after dialling has been completed.
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21. A processing unit for use in a system for monitoring numbers dialled over monitored telephone lines, the processing unit comprising play-back means for playing-back a recording medium on which pulses including dial pulses from the monitored telephone line have been recorded, a discriminator for accepting recorded pulses which fall within acceptable dial pulse tolerances, a counter for counting dial pulses accepted by the discriminator and an automatic printer responsive to the counter for displaying the numbers dialled over the monitored telephone lines.
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22. A system for monitoring numbers dialled over a telephone line, the system comprising at least one recording unit for sensing dial pulses on a monitored telephone line and for recording the sensed pulses on a recording medium, a processing unit for playing-back the recording medium, analysing the recorded dial pulses and producing a display of numbers dialled, said recording unit including means for only recording signals on the monitored telephone line which are above a predetermined threshold level in the range of 10dB to 30dB less than the level of the dial pulses.
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23. A system for monitoring numbers dialled over a telephone line, the system comprising at least one recording unit for sensing dial pulses on a monitored telephone line and for recording the sensed pulses on a recording medium, and a processing unit for playing-back the recording medium, analysing the recorded dial pulses and producing a display of numbers dialled, said processing unit including means for ignoring single pulses in any recorded number until after a digit of two or more pulses is detected.
Specification