System for party line signalling using re-encoded ringing signals专利检索-去振铃图形技术专利检索查询-专利查询网

System for party line signalling using re-encoded ringing signals

阅读：246发布：2021-09-10

专利汇可以提供System for party line signalling using re-encoded ringing signals专利检索，专利查询，专利分析的服务。并且A telephone party line signalling system which employs an electronic monitor circuit at the output end of a central office switching circuit to detect the code of any coded ringing signal emanating from the office. Responsive to this code, the monitor circuit stores and re-encodes these signals into a signal in other forms. The re-encoded signal is sent out over a called line, the other signal form being a multifrequency set of tones which characterize a particular digit in the well known pushbutton tone signalling, for example. Each subscriber station is adapted to respond to the combination of the frequencies comprising these tones and to locally supply ringing current to its own subscriber station.，下面是System for party line signalling using re-encoded ringing signals专利的具体信息内容。

权利要求

1. A code ringing monitor system associated with a telephone party line extending between a code ringing central office and a plurality of party line subscriber stations, said monitoring means comprising: an electronic circuit means for decoding ringing signals appearing on said party line, means for reencoding said ringing signals into multi-frequency digital signals, means for transmitting said multi-frequency digital signals over said party line to said plurality of stations, means at each of said stations for detecting the particular combination of said multi-frequencies which so identify that station, and means responsive to said detection of the frequencies which so identify that station for locally generating signalling current which signals the subscriber at that station, wherein said multifrequency signals comprise combinations of tones used in pushbutton dialling and said re-encoding means comprises means for converting said digital signals into a corresponding multifrequency pushbutton dialer digit signal, means for detecting reverting calls, and means responsive to said detection of a reverting call for sending a unique multi-frequency digital signal over said party line.

2. A selective ringing system comprising a telephone line having at least tip and ring conductors, Ringing current detector means connected to each of said conductors, memory means responsive to said detector means for storing a memory of each occurrence of ringing current detected, means for measuring the duration of each occurrence of ringing current, means responsive to said measuring means for re-encoding said ringing current as a multi-frequency digital signal, and means for preventing a fragment of one ringing code from remaining in a memory means and mutilating the next ringing code.

3. The system of claim 2 wherein said mutilation prevention means comprises a gate responsive to a coincidence of the end of one ringing code and the start of the next ringing code.

4. The system of claim 2 and means for detecting reverting calls responsive to ringing current on both said tip and ring conductors, and means responsive to said reverting call detection for transmitting a unique multi-frequency digital signal to said line.

5. A telephone party line signalling system extending between a code ringing central office and a plurality of party line subscriber stations, comprising monitoring circuit means for decoding coded ringing signals appearing on a party line, said decoding means comprising means for classifying signals as to signal duration, separate means for counting signals of each classified duration, means responsive to the signal count for re-encoding said ringing signals from the ringing code into multi-frequency digital signals within voice range, means for transmitting said multi-frequency digital signals over said party line to said plurality of stations, means at each of said stations for detecting the particular combination of said multi-frequencies which uniquely identifies that station, and means responsive to said detection of the combination of the frequencies which so identify that station for locally generating signalling current for signalling the subscriber at that station.

6. A signalling system as claimed in claim 5, wherein said ringing signals comprise coded signal bursts, the first of each code being a long burst, means responsive to only the long bursts for enabling said re-encoding means, and means for resetting each system on a short duration burst occuring as the first of a code.

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System for party line signalling using re-encoded ringing signals

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