WO1988002964A1 - Telephone system - Google Patents

Telephone system Download PDF

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Publication number
WO1988002964A1
WO1988002964A1 PCT/GB1987/000717 GB8700717W WO8802964A1 WO 1988002964 A1 WO1988002964 A1 WO 1988002964A1 GB 8700717 W GB8700717 W GB 8700717W WO 8802964 A1 WO8802964 A1 WO 8802964A1
Authority
WO
WIPO (PCT)
Prior art keywords
extension
calling
telephone system
signal
calling extension
Prior art date
Application number
PCT/GB1987/000717
Other languages
French (fr)
Inventor
Bernhard Dollman Parker
Original Assignee
Bernhard Dollman Parker
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bernhard Dollman Parker filed Critical Bernhard Dollman Parker
Priority to GB08813681A priority Critical patent/GB2204464A/en
Publication of WO1988002964A1 publication Critical patent/WO1988002964A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/57—Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set

Definitions

  • This invention relates to a telephone system, particularly a private automatic branch exchange system, and to extension apparatus for use in such system.
  • a telephone system including apparatus for identifying a calling extension to a called extension, the apparatus comprising, for a calling extension, means to generate for transmission down the line, on activation of the calling extension, a signal identifying the calling extension,, and means to transmit the identifying signal when a dialling signal is not being transmitted down the line and to deactivate the signal generating means in response to a * return signal from the called extension; and, for the called extension, display means activated by the identifying signal received, rom the calling extension to indicate the identity of the calling extension, and means to transmit said return signal down the line to the calling extension.
  • the apparatus of the calling extension also includes a display means as in the apparatus of the called extension for displaying identities of extensions calling the calling extension.
  • said identifying signal is transmitted by the calling extension a number of times after completion of the dialling signal transmitted by the calling extension.
  • Said return signal transmitted by the called extension can be said identifying signal transmitted by the calling extension.
  • this shows the apparatus of an extension of a private automatic branch exchange telephone system, which apparatus is connected to a two-wire line 1.
  • the line 1 is connected to a conventional protection circuit 2 which serves to filter out any stray signals on the line 1, and which also contains a full wave rectifier arrangement.
  • the output of the circuit 2 is used to charge a battery 3 which .provides power for the r apparatus, by way of a high value resistor 4 which serves to limit the current drawn from the line 1.
  • Power supply from the battery 3 is controlled by a conventional cradle switch 5 operated by a conventional handset of the apparatus comprising a microphone 6 and earpiece 7.
  • a speech and line interface circuit 10 ensures correct line conditions and provides the necessary drive and input to the microphone 6 and earpiece 7.
  • the circuit 10 also controls a pulse dialler circuit 11 which when dialling takes place produces ten pulses per second dialling signal on the line 1. Operation of the apparatus is controlled by a processor 12 which is an 8 bit CMOS device. Audio signals received by the .
  • the apparatus over the line 1 are fed to the processor 12 by way of a signal tone detection and analogue interface circuit 13 connected to the earpiece 7.
  • the received signals are filtered by a broad band filter over the range of the expected tone frequencies, squared, and then fed to a zero-crossing detector which produces pulses for both positive and negative going transitions of the signal, the pulses produced being fed to the processor 12 to control interrupts.
  • Digital control signals from the processor 12 are converted in a digital to analogue converter 14 for supply to the interface circuit 10 for control of transmission on the line 1.
  • a calling signal (ringing tone) appears on the line this is detected by a ringing tone detector circuit 15 which in response thereto triggers the processor 12.
  • the circuit 15 includes an opto-isolator arrangement which serves to buffer signals on the line 1 for the processor 12.
  • a keypad 16 Connected to the processor 12 is a keypad 16 , which is scanned and read by the processor 12, and by which identifying signal numbers are inputted into a serial read/write EEPROM device 17 which serves -to store the inputted numbers and other system constants. Also connected to the processor 12 is a twenty digit liquid crystal display device 18 which is driven by the processor 12 by way of an interface circuit 19.
  • the identifying signal for a calling extension can be an arbitrarily allocated number, or preferably the telephone number of the calling extension.
  • the signals can be fed to the device 17 from an external source, for example down the line 1.
  • the extension When the extension is to be used as a calling extension the handset 6, 7 is lifted, and the apparatus at the extension thus connected to the line 1 by the switch 5. Dialling of the called extension's number is effected using the dialler circuit 11.
  • an identifying signal indicating the identity of the calling station is taken from the device 17 and supplied by the processor 12 through the converter 14 to the circuit 10 as a digitally encoded audio signal for transmission down the line 1 to the called extension, the identifying signal being transmitted when no dialling signal is present on the line 1, such transmissions being continued for a predetermined number of times or until * a return signal is received from the called extension to indicate completion of the required connection. Any return signal received is passed by the interface circuit 13 to the processor 12 where is serves to terminate transmission of the identifying signal.
  • any identifying signal transmitted by the calling extension as described above is passed to the processor 12 by way of the interface circuit 13, and is processed by the processor 12 which in response thereto activates the display 18 by way of the interface 19, to display the identity of the calling extension. Subsequently the processor 12 transmits a return signal down the line 1, by way of the converter 14, to terminate transmission of the identifying signal by the calling - 3 , -
  • The-display 18 at the called extension can be arranged to display a simple indication of a call, for example the word 'CALL'., in response to [coupling of the calling extension thereto, and subsequently to display the identity of the calling extension as determined by the identifying signal from the calling extension.
  • the apparatus of the calling extension can include an over-ride switch for deactivating the identifying signal generating means in the processor when the caller does not wish his identity to be transmitted to the called extension.
  • a four-signature signalling system as described in British Patent Specification No. 860830 can be used for transmission of the identifying and return signals in a system as described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

In a telephone system a calling extension includes means to transmit an identifying signal characteristic of the calling extension, to a called extension which has a display responsive to receipt of the identifying signal to indicate the identity of the calling extension. On receipt of an identifying signal the called extension transmits a return signal to the calling extension, which return signal serves to terminate transmission of the identifying signal.

Description

TELEPHONE SYSTEM
This invention relates to a telephone system, particularly a private automatic branch exchange system, and to extension apparatus for use in such system.
According to this invention there is provided a telephone system including apparatus for identifying a calling extension to a called extension, the apparatus comprising, for a calling extension, means to generate for transmission down the line, on activation of the calling extension, a signal identifying the calling extension,, and means to transmit the identifying signal when a dialling signal is not being transmitted down the line and to deactivate the signal generating means in response to a*return signal from the called extension; and, for the called extension, display means activated by the identifying signal received, rom the calling extension to indicate the identity of the calling extension, and means to transmit said return signal down the line to the calling extension.
Preferably the apparatus of the calling extension also includes a display means as in the apparatus of the called extension for displaying identities of extensions calling the calling extension. I
Preferably said identifying signal is transmitted by the calling extension a number of times after completion of the dialling signal transmitted by the calling extension.
Said return signal transmitted by the called extension can be said identifying signal transmitted by the calling extension.
This invention will now be described by way of example with reference to the drawing which is a block schematic diagram of an extension apparatus for use in a system according to the .invention.
Referring to the drawing, this shows the apparatus of an extension of a private automatic branch exchange telephone system, which apparatus is connected to a two-wire line 1.
At the extension the line 1 is connected to a conventional protection circuit 2 which serves to filter out any stray signals on the line 1, and which also contains a full wave rectifier arrangement. The output of the circuit 2 is used to charge a battery 3 which .provides power for ther apparatus, by way of a high value resistor 4 which serves to limit the current drawn from the line 1. Power supply from the battery 3 is controlled by a conventional cradle switch 5 operated by a conventional handset of the apparatus comprising a microphone 6 and earpiece 7. 'When the handset 6 7 is in place on the cradle switch 5 the battery 3 is charged from the line by way of the resistor 4, and when the heandset 6, 7 is lifted the battery 3 is charged at a relatively high rate from the line 1 through a charge control circuit 8 by way of a diode 9. A speech and line interface circuit 10 ensures correct line conditions and provides the necessary drive and input to the microphone 6 and earpiece 7. The circuit 10 also controls a pulse dialler circuit 11 which when dialling takes place produces ten pulses per second dialling signal on the line 1. Operation of the apparatus is controlled by a processor 12 which is an 8 bit CMOS device. Audio signals received by the . apparatus over the line 1 are fed to the processor 12 by way of a signal tone detection and analogue interface circuit 13 connected to the earpiece 7. The received signals are filtered by a broad band filter over the range of the expected tone frequencies, squared, and then fed to a zero-crossing detector which produces pulses for both positive and negative going transitions of the signal, the pulses produced being fed to the processor 12 to control interrupts. Digital control signals from the processor 12 are converted in a digital to analogue converter 14 for supply to the interface circuit 10 for control of transmission on the line 1. When a calling signal (ringing tone) appears on the line this is detected by a ringing tone detector circuit 15 which in response thereto triggers the processor 12. The circuit 15 includes an opto-isolator arrangement which serves to buffer signals on the line 1 for the processor 12.
Connected to the processor 12 is a keypad 16 , which is scanned and read by the processor 12, and by which identifying signal numbers are inputted into a serial read/write EEPROM device 17 which serves -to store the inputted numbers and other system constants. Also connected to the processor 12 is a twenty digit liquid crystal display device 18 which is driven by the processor 12 by way of an interface circuit 19. The identifying signal for a calling extension can be an arbitrarily allocated number, or preferably the telephone number of the calling extension. As an alternative to use of the keypad 16 for storage of identifying-signals, the signals can be fed to the device 17 from an external source, for example down the line 1.
The apparatus described above operates as follows.
When the extension is to be used as a calling extension the handset 6, 7 is lifted, and the apparatus at the extension thus connected to the line 1 by the switch 5. Dialling of the called extension's number is effected using the dialler circuit 11. At the same time an identifying signal indicating the identity of the calling station is taken from the device 17 and supplied by the processor 12 through the converter 14 to the circuit 10 as a digitally encoded audio signal for transmission down the line 1 to the called extension, the identifying signal being transmitted when no dialling signal is present on the line 1, such transmissions being continued for a predetermined number of times or until* a return signal is received from the called extension to indicate completion of the required connection. Any return signal received is passed by the interface circuit 13 to the processor 12 where is serves to terminate transmission of the identifying signal.
The telephone connection between the calling and called extensions then takes place in the usual manner. _
When the extension is a called extension, receipt of a ringing signal is detected by detector 15 and in response thereto an indication of the incoming call is given in conventional manner by the ringing of a bell or the like. When the handset 6, 7 is lifted and the apparatus at the extension thus connected to the line 1, any identifying signal transmitted by the calling extension as described above is passed to the processor 12 by way of the interface circuit 13, and is processed by the processor 12 which in response thereto activates the display 18 by way of the interface 19, to display the identity of the calling extension. Subsequently the processor 12 transmits a return signal down the line 1, by way of the converter 14, to terminate transmission of the identifying signal by the calling - 3 , -
station, as described above- On termination of the connection the handset 6, 7 at the called extension is replaced, this effecting clearing of the display 18 at the called extension. It will be appreciated that although in the system as described above both extensions, when being a called extension, are able to identify the.calling extension before answering a call, it is not essential for this facility to be given to all extensions in a system. Only selected extensions need be provided with a display and the associated interface, extensions without such apparatus still transmitting their identifying signal when acting as a calling extension but simply responding in the normal manner when acting as a called extension without any indication of the identity of the calling extension being given.
The-display 18 at the called extension can be arranged to display a simple indication of a call, for example the word 'CALL'., in response to [coupling of the calling extension thereto, and subsequently to display the identity of the calling extension as determined by the identifying signal from the calling extension. The apparatus of the calling extension can include an over-ride switch for deactivating the identifying signal generating means in the processor when the caller does not wish his identity to be transmitted to the called extension. A four-signature signalling system as described in British Patent Specification No. 860830 can be used for transmission of the identifying and return signals in a system as described above.

Claims

1. A telephone system including apparatus for identifying a calling extension to a called extension, the apparatus comprising, for a calling extension, means to generate for transmission down the line on activation of the calling extension, a signal identifying the calling extension, and means to transmit the identifying signal when a dialling signal is not being transmitted dow the line and to deactivate the signal generating means in response to a return signal from the called extension; and, for the called extension, display means activated by the identifying signal received from the calling extension to indicate the identity of the calling extension, and means to transmit said return signal down the line to the calling extension.
2. A telephone system as claimed in Claim 1, wherein the apparatus of the calling extension also includes a display means as in the apparatus of the called extension for displaying identities of extensions calling the calling extension.
3. A telephone system as claimed in Claim 1 or Claim 2, wherein the apparatus of the called extension includes means for clearing the display means of the called extension in response to removal and replacement of the handset of that extension.
4. A telephone system as claimed in any preceding claim, wherein the display means of the called extension is arranged to display a simple indication of the call in response to coupling of the calling extension thereto, and subsequently to display the identity of the calling extension as determined by said identifying signal from the calling extension.
5. A telephone system as claimed in any preceding claim, wherein said identifying signal is transmitted by the calling extension a number of times after completion of the dialling signal transmitted by the calling extension.
6. A telephone system as claimed in any preceding claim, wherein said return signal transmitted by the called extension is said identifying signal transmitted by the calling extension.
7. A telephone system as claimed in any preceding claim, wherein the calling extension. has an over-ride switch for deactivating the identifying signal generating means when the caller does not wish his identity to be transmitted to the called extension.
8. A telephone system as claimed in any preceding1 claim, in which the apparatus of the calling extension includes a store storing said identifying signal.
9. A telephone system as claimed in Claim 8, in which the apparatus of the calling extension includes a keypad by which said identifying signal is introduced into said store.
10. A telephone system as claimed in Claim 8, in which said identifying signal is introduced into said store from outside the apparatus over the telephone line.
11. A telephone system as claimed in any preceding claim, in which the apparatus of each extension includes a processor serving to control operation of the extension.
12. A telephone system as claimed in any preceding claim, in which signalling is effected using a four-signature system as described in Brjitish Patent Specification No. 860830. i
13. A private network telephone system as claimed in any preceding' claim,
14. A public network telephone system as claimed in any one of Claims 1 to 12.
PCT/GB1987/000717 1986-10-13 1987-10-13 Telephone system WO1988002964A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08813681A GB2204464A (en) 1986-10-13 1987-10-13 Telephone system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868624514A GB8624514D0 (en) 1986-10-13 1986-10-13 Telephone systems
GB8624514 1986-10-13

Publications (1)

Publication Number Publication Date
WO1988002964A1 true WO1988002964A1 (en) 1988-04-21

Family

ID=10605664

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1987/000717 WO1988002964A1 (en) 1986-10-13 1987-10-13 Telephone system

Country Status (2)

Country Link
GB (2) GB8624514D0 (en)
WO (1) WO1988002964A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0420204A2 (en) * 1989-09-28 1991-04-03 Siemens Aktiengesellschaft Method for the transmission of subscriber data from one secret subscriber to another in communication exchanges
DE19914553A1 (en) * 1999-03-31 2000-10-05 Helmuth Eberst Multifunction display device for telephone

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2106751A (en) * 1981-09-03 1983-04-13 Micro Tek Inc Security identification system using pulse code modulation
US4443664A (en) * 1982-07-02 1984-04-17 Rca Corporation Telephone station incorporating exchange message system
WO1986001358A1 (en) * 1984-08-10 1986-02-27 Atis Assmann Gmbh Method for identifying calling or called terminals and device for implementing such a method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2106751A (en) * 1981-09-03 1983-04-13 Micro Tek Inc Security identification system using pulse code modulation
US4443664A (en) * 1982-07-02 1984-04-17 Rca Corporation Telephone station incorporating exchange message system
WO1986001358A1 (en) * 1984-08-10 1986-02-27 Atis Assmann Gmbh Method for identifying calling or called terminals and device for implementing such a method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0420204A2 (en) * 1989-09-28 1991-04-03 Siemens Aktiengesellschaft Method for the transmission of subscriber data from one secret subscriber to another in communication exchanges
EP0420204A3 (en) * 1989-09-28 1993-01-27 Siemens Aktiengesellschaft Method for the transmission of subscriber data from one secret subscriber to another in communication exchanges
DE19914553A1 (en) * 1999-03-31 2000-10-05 Helmuth Eberst Multifunction display device for telephone

Also Published As

Publication number Publication date
GB2204464A (en) 1988-11-09
GB8624514D0 (en) 1986-11-19
GB8813681D0 (en) 1988-07-27

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