CA2309531A1 - Method to interface a cellular (wireless) telephone to a standard telephone set - Google Patents
Method to interface a cellular (wireless) telephone to a standard telephone set Download PDFInfo
- Publication number
- CA2309531A1 CA2309531A1 CA 2309531 CA2309531A CA2309531A1 CA 2309531 A1 CA2309531 A1 CA 2309531A1 CA 2309531 CA2309531 CA 2309531 CA 2309531 A CA2309531 A CA 2309531A CA 2309531 A1 CA2309531 A1 CA 2309531A1
- Authority
- CA
- Canada
- Prior art keywords
- interface
- cellular
- telephone
- micro
- controller
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/14—WLL [Wireless Local Loop]; RLL [Radio Local Loop]
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Description
METHOD TO INTERFACE A CELLULAR (WIRELESS) TELEPHONE TO A
STANDARD TELEPHONE SET
Field of the invention The present invention relates to a method and apparatus to interface a wireless device to a standard telephone set. More particularly, the present invention relates to such a method and apparatus to interface a cellular telephone to a standard telephone set.
Description of the prior art.
Cellular phone are now quite common. In fact, such telephones, and other wireless devices, are becoming so popular that some people do not see the need for standard, land-line telephones within a house. Indeed, the cost of operating a cellular phone has decreased to the point that it is competitive with local service.
Some of the disadvantages of replacing standard telephone lines with wireless units are that the wireless device must always be carried with the user and eventually recharged. Also, there can only be one handset per phone number in cellular technology, as opposed to standard telephone service where many handset can be associated with a single telephone number.
There is consequently a need for a method and device to interface a wireless device to a standard telephone set.
Summary of the invention The present invention is directed to a method and device to interface/interconnect a cellular telephone to a regular telephone set circuit that is disconnected from the C.O. (Central Office).
STANDARD TELEPHONE SET
Field of the invention The present invention relates to a method and apparatus to interface a wireless device to a standard telephone set. More particularly, the present invention relates to such a method and apparatus to interface a cellular telephone to a standard telephone set.
Description of the prior art.
Cellular phone are now quite common. In fact, such telephones, and other wireless devices, are becoming so popular that some people do not see the need for standard, land-line telephones within a house. Indeed, the cost of operating a cellular phone has decreased to the point that it is competitive with local service.
Some of the disadvantages of replacing standard telephone lines with wireless units are that the wireless device must always be carried with the user and eventually recharged. Also, there can only be one handset per phone number in cellular technology, as opposed to standard telephone service where many handset can be associated with a single telephone number.
There is consequently a need for a method and device to interface a wireless device to a standard telephone set.
Summary of the invention The present invention is directed to a method and device to interface/interconnect a cellular telephone to a regular telephone set circuit that is disconnected from the C.O. (Central Office).
2 Such a device and method can be used for forwarding incoming and outgoing calls to a cellular telephone.
Advantages ~ Reuse of existing standard telephone wiring in buildings ~ Eliminate the costs associated to regular telephone lines.
~ Extend the life of standard telephone sets in a world going wireless.
~ Isolates the user from exposure to cellular telephone radiation.
~ Convenient in being able to answer incoming calls from any standard telephone set when a cellular telephone is plugged in the proposed cradle device.
~ Convenient in not needing to remove cellular telephone from charger when answering calls.
~ Can potentially save long distance costs (when used in an adjacent calling area).
Preferably, the cellular telephone interface will be very similar to an existing charging stand. Basically the phone would sit in a cradle. The cradle would have the possibility to hold multiple telephones, but with one being the main slot.
Each slot will be able to recharge independently its associated telephone battery.
The cradle would then simply be plugged in any RJ-11 jack.
The device is composed of (3) three major components:
1. The cellular telephone interface, with its main function of communicating and controlling the cellular telephones activity;
2. The analog phone circuit, with its main function of simulating CO
(Central Office) features, such as power supply, distinct ring signal, dial tone, sensing on-hook and off-hook of a standard telephone set;
Advantages ~ Reuse of existing standard telephone wiring in buildings ~ Eliminate the costs associated to regular telephone lines.
~ Extend the life of standard telephone sets in a world going wireless.
~ Isolates the user from exposure to cellular telephone radiation.
~ Convenient in being able to answer incoming calls from any standard telephone set when a cellular telephone is plugged in the proposed cradle device.
~ Convenient in not needing to remove cellular telephone from charger when answering calls.
~ Can potentially save long distance costs (when used in an adjacent calling area).
Preferably, the cellular telephone interface will be very similar to an existing charging stand. Basically the phone would sit in a cradle. The cradle would have the possibility to hold multiple telephones, but with one being the main slot.
Each slot will be able to recharge independently its associated telephone battery.
The cradle would then simply be plugged in any RJ-11 jack.
The device is composed of (3) three major components:
1. The cellular telephone interface, with its main function of communicating and controlling the cellular telephones activity;
2. The analog phone circuit, with its main function of simulating CO
(Central Office) features, such as power supply, distinct ring signal, dial tone, sensing on-hook and off-hook of a standard telephone set;
3. The micro-controller, with its main function of monitoring activity on both interfaces (Cellular and analog telephone interfaces) and assuring proper sequencing of actions upon reception of events.
The cellular phone interface circuitry is composed of a physical connection between the cellular telephones and the micro-controller component. This is achieved with the use of a connector that fits into the cellular telephone external connector. The main functions of the interface will be to physically connect the cellular telephones to the micro-controller, send commands to the cellular telephones, receive status information from the cellular telephones and finally redirect the audio TO and FROM the cellular telephones. The type of status information being received from the cellular telephones will look as follow:
(Telephone is available, telephone is ringing, telephone is attempting to establish a call). Typical commands that will be sent to the cellular telephones will look as follows: (Answer incoming call, Release call, Dial a number). The communication between the cellular telephone and the micro-controller is done through a proprietary protocol supplied by the cellular telephone manufacturers (Motorola, Nokia, Ericsson, etc..). The secondary function of the interface is to also provide a battery charging feature.
The following procedures can be used within the context of the present invention.
1. Outgoing call The cellular telephone that is in the master slot will receive a command from the micro-controller to attempt to establish a call. When the call is finished (All standard telephone sets are on-hook) the micro-controller will signal the cellular telephone to end the call. The protocol and command formats sent to the cellular telephone are proprietary information provided by the cellular telephone manufacturers.
2. Incoming call The micro-controller will be continually polling all the cellular telephones status to detect any incoming call. The protocol and status information formats received from the cellular telephones are again proprietary information provided by the cellular telephone manufacturers.
The cellular phone interface circuitry is composed of a physical connection between the cellular telephones and the micro-controller component. This is achieved with the use of a connector that fits into the cellular telephone external connector. The main functions of the interface will be to physically connect the cellular telephones to the micro-controller, send commands to the cellular telephones, receive status information from the cellular telephones and finally redirect the audio TO and FROM the cellular telephones. The type of status information being received from the cellular telephones will look as follow:
(Telephone is available, telephone is ringing, telephone is attempting to establish a call). Typical commands that will be sent to the cellular telephones will look as follows: (Answer incoming call, Release call, Dial a number). The communication between the cellular telephone and the micro-controller is done through a proprietary protocol supplied by the cellular telephone manufacturers (Motorola, Nokia, Ericsson, etc..). The secondary function of the interface is to also provide a battery charging feature.
The following procedures can be used within the context of the present invention.
1. Outgoing call The cellular telephone that is in the master slot will receive a command from the micro-controller to attempt to establish a call. When the call is finished (All standard telephone sets are on-hook) the micro-controller will signal the cellular telephone to end the call. The protocol and command formats sent to the cellular telephone are proprietary information provided by the cellular telephone manufacturers.
2. Incoming call The micro-controller will be continually polling all the cellular telephones status to detect any incoming call. The protocol and status information formats received from the cellular telephones are again proprietary information provided by the cellular telephone manufacturers.
4 The Standard Telephone Set Interface The standard telephone set interface circuitry is composed of a physical connection between the "house" wiring via RJ-11 jack and the micro-controller component housed in a cradle shape container. The main functions of the standard telephone set interface are to be implemented by a few circuits that basically simulate the functions of a CO (central office). The interface is broken up into four more components.
1. A ring generating circuit that generates the 90Volt RMS at 30Hz to the telephone set;
2. A dial tone generating circuit that supply a dial-tone when a standard telephone set is detected off-hook.;
3. A power supply to supply the 45Volts to the line and all the components;
4. A DTMF decoder circuit to decode DTMF signals and convert them to a binary format; and
1. A ring generating circuit that generates the 90Volt RMS at 30Hz to the telephone set;
2. A dial tone generating circuit that supply a dial-tone when a standard telephone set is detected off-hook.;
3. A power supply to supply the 45Volts to the line and all the components;
4. A DTMF decoder circuit to decode DTMF signals and convert them to a binary format; and
5. Finally a SLIC integrated circuit to patch audio signals and detect standard telephone set act1 ivity.
1. Outgoing call When the standard telephone set is off-hook, the standard telephone interface signals the micro-controller through the interface circuitry. This is achieved with the use of a SLIC (Subscriber Line Integrated Circuit) and an oscillator circuit a dial tone type frequency signal to the telephone set. The interface will then decode the dialed numbers with a DTMF (Dial Tone Modulated Frequency) decoder circuit and forward this data in a binary format to the micro-controller for parsing and temporary storage. The program stored in the micro-controller will parse the number and determine when to send the complete number to the Cellular telephone interface.
2. Incoming call When an incoming call is sensed on one of the connected cellular telephones, the standard telephone set interface will receive a signal from the micro-controller to start it's ringer circuit with it's associated distinct ring. This state will be maintained 5 until the micro-controller receives an off-hook signal from the standard telephone set interface or other conditions originating from the cellular telephone interface is reversed. The off-hook sensing is achieved with the SLIC integrated circuit, the output is a TTL high signal forwarded to the micro-controller.
The Micro-Controller Module The micro-controller module is composed of a micro-controller unit, memory and input/output communication channels. The main function of the module is to monitor events and start or stop actions on the associated interface circuits.
The micro-controller will be programmed on an event driven programming paradigm.
In other words, when an event is detected, an action or multiple actions will be executed.
The micro-controller will be programmed to continually monitor cellular telephone activity. The program will poll the cellular telephone interface for activity and trigger the standard telephone set interface. The same polling principle would apply in the case the standard telephone set activity would be detected.
1. Outgoing call When the standard telephone set is off-hook, the micro-controller receives a signal from the standard telephone set interface. This means that an outgoing call is being initiated. The micro-controller will trigger the dial tone generating circuit and prepare to receive numbers in a binary format sent from the DTMF circuit. When the first number is received, the micro-controller will trigger off the dial tone generating circuit. Afterwards, as numbers are received into the micro-controller, a program stored in the micro-controller will parse and analyze the number.
The program stored in the micro-controller will parse the number and determine when
1. Outgoing call When the standard telephone set is off-hook, the standard telephone interface signals the micro-controller through the interface circuitry. This is achieved with the use of a SLIC (Subscriber Line Integrated Circuit) and an oscillator circuit a dial tone type frequency signal to the telephone set. The interface will then decode the dialed numbers with a DTMF (Dial Tone Modulated Frequency) decoder circuit and forward this data in a binary format to the micro-controller for parsing and temporary storage. The program stored in the micro-controller will parse the number and determine when to send the complete number to the Cellular telephone interface.
2. Incoming call When an incoming call is sensed on one of the connected cellular telephones, the standard telephone set interface will receive a signal from the micro-controller to start it's ringer circuit with it's associated distinct ring. This state will be maintained 5 until the micro-controller receives an off-hook signal from the standard telephone set interface or other conditions originating from the cellular telephone interface is reversed. The off-hook sensing is achieved with the SLIC integrated circuit, the output is a TTL high signal forwarded to the micro-controller.
The Micro-Controller Module The micro-controller module is composed of a micro-controller unit, memory and input/output communication channels. The main function of the module is to monitor events and start or stop actions on the associated interface circuits.
The micro-controller will be programmed on an event driven programming paradigm.
In other words, when an event is detected, an action or multiple actions will be executed.
The micro-controller will be programmed to continually monitor cellular telephone activity. The program will poll the cellular telephone interface for activity and trigger the standard telephone set interface. The same polling principle would apply in the case the standard telephone set activity would be detected.
1. Outgoing call When the standard telephone set is off-hook, the micro-controller receives a signal from the standard telephone set interface. This means that an outgoing call is being initiated. The micro-controller will trigger the dial tone generating circuit and prepare to receive numbers in a binary format sent from the DTMF circuit. When the first number is received, the micro-controller will trigger off the dial tone generating circuit. Afterwards, as numbers are received into the micro-controller, a program stored in the micro-controller will parse and analyze the number.
The program stored in the micro-controller will parse the number and determine when
6 to send the complete number to the Cellular telephone interface. Once the program determines the number is complete, it formats and sends it in the form of a command to the cellular telephone interface. The micro-controller will then trigger the Audio amplifier circuit on. The micro-controller will then wait for an on-hook signal to issue a "release call" command to the cellular telephone interface.
2. Incoming call When an incoming call is sensed on one of the connected cellular telephones, the micro-controller will receive this status information. It will then proceed to trigger the ringer circuit with it's associated distinct ring. The micro-controller will then wait for a off-hook signal from the standard telephone set circuit. If a off-hook signal is received, the micro-controller will then send a pick-up call command to the cellular telephone. Finally, the micro-controller will trigger the Audio amplifier circuit on. The micro-controller will then wait for an on-hook signal to issue a "release call" command to the cellular telephone interface.
Brief description of the drawin4s The present invention will be better understood with the help of the following drawings, in which:
Figure 1 is a schematic representation of the interface within a system;
Figure 2 is a schematic representation of the main components of the interface device according to a preferred embodiment of the present invention;
Figure 3 is a schematic representation of the decoder circuits;
Figure 4 is a schematic representation of the interconnection of the micro-controller; and Figures 5 and 6 are state transition models for an incoming call data flow diagram and an outgoing call data flow diagram, respectively.
2. Incoming call When an incoming call is sensed on one of the connected cellular telephones, the micro-controller will receive this status information. It will then proceed to trigger the ringer circuit with it's associated distinct ring. The micro-controller will then wait for a off-hook signal from the standard telephone set circuit. If a off-hook signal is received, the micro-controller will then send a pick-up call command to the cellular telephone. Finally, the micro-controller will trigger the Audio amplifier circuit on. The micro-controller will then wait for an on-hook signal to issue a "release call" command to the cellular telephone interface.
Brief description of the drawin4s The present invention will be better understood with the help of the following drawings, in which:
Figure 1 is a schematic representation of the interface within a system;
Figure 2 is a schematic representation of the main components of the interface device according to a preferred embodiment of the present invention;
Figure 3 is a schematic representation of the decoder circuits;
Figure 4 is a schematic representation of the interconnection of the micro-controller; and Figures 5 and 6 are state transition models for an incoming call data flow diagram and an outgoing call data flow diagram, respectively.
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2309531 CA2309531A1 (en) | 2000-05-25 | 2000-05-25 | Method to interface a cellular (wireless) telephone to a standard telephone set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2309531 CA2309531A1 (en) | 2000-05-25 | 2000-05-25 | Method to interface a cellular (wireless) telephone to a standard telephone set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2309531A1 true CA2309531A1 (en) | 2001-11-25 |
Family
ID=4166256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2309531 Abandoned CA2309531A1 (en) | 2000-05-25 | 2000-05-25 | Method to interface a cellular (wireless) telephone to a standard telephone set |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2309531A1 (en) |
-
2000
- 2000-05-25 CA CA 2309531 patent/CA2309531A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |