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| Blending communications in a call center |
| OF THE INVENTION In one embodiment of the invention, shown in FIG. 1, a PBX 50, serving one or ... |
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| Automatic call screening telecommunication device |
| OF VARIOUS ILLUSTRATIVE EMBODIMENTS While the present invention automatic call screening ... |
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| Computer controlled paging and telephone communication system and method |
| Overview FIG. 1 illustrates, in block diagram form, a Telephone Control System that may be used to ... |
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| Method and system for capturing telephone calls |
| Systems and methods consistent with the present invention address this need by permitting a user to ... |
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| Method and system for real-time monitoring of voice mail during active call |
| The present invention provides a method and a system for real-time monitoring of voice mail during ... |
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| Methods and systems for telephony call completion |
| OF PREFERRED EMBODIMENTS The present invention is related to methods and systems for detecting and ... |
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| Systems and methods for monitoring network-based voice messaging systems |
| The present invention provides systems and methods for monitoring a call directed to a network-... |
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| Node adapted for backplane bus with default control |
| It is therefore an object of the present invention to ensure reliable operation of a computer ... |
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Device for protecting the validity of time sensitive information
| Details |
Inventors: Goudard, Jean-Louis; Pottier, Denis; Hoppe, Joseph;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Hayes; Gail O.
Assistant Examiner: Verdon; Hayward A.
Attorney, Agent or Firm: Balconi-Lamica; Michael J.
The clock circuit is formed by an oscillator (10-12) which is coupled to a counter/divider circuit (15) provided with read accesses (30). In order to prevent falsification of its data, the circuit is formed as a protected casing and includes a protected access circuit (50) which is connected between said accesses and the counter/divider circuit. Furthermore, a circuit for monitoring the frequency of the oscillator may be provided (100-50). |
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DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS FIG.
1 shows a diagram of a circuit in accordance with the invention.
The overall circuit is labelled `1`.
It comprises essentially an oscillator 10 which is controlled by a quartz crystal 12, and a counter/divider 15.
These components may form part of an integrated circuit 20 of the kind commercially available under type number PCF8583 from Philips Electronics N.
V.
, Eindhoven, the Netherlands.
The contents of this counter/divider provides various date information for a RAM 22 which is addressed by an addressing member 24.
This output information is: the year, the month, the day, the hour, the minutes, the seconds, etc.
Other information can also be stored in said memory: alarm information, rules information, etc.
The information stored in this memory can be read via a line 26 connected to its output.
An interface 30 enables communication of the I.
sup.
2 C type with the environment of the circuit 20.
A logic member 32 enables control of the entire operation of this circuit 20.
The circuit 20 is powered by a voltage applied to a terminal 33.
In order to prevent falsification of the information produced by the circuit 20, in accordance with the invention a protection circuit 50, in hybrid form or of not, is integrated on the same substrate as the circuit 20.
Due to the integration, no intervention whatsoever can take place in the circuit 1.
Integration may be accompanied by encapsulation of the entire circuit 1, making intrusions even more unlikely.
The protection circuit is 50, for example a circuit of the kind commercially available under type number MC6805SC24 from Motorola.
This circuit is formed by a microprocessor 55 whereto there are connected a RAM 57, a ROM 59 which contains the instructions for the operation of the microprocessor 55, and also an EEPROM 61 which can store various data which cannot be erased by interruption of the power supply.
This circuit 50 has been in extensive commercial use in the chip card or smart card market, the latter now having attained common general knowledge
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Processing Data 
