GB2323244A - Method of switching - Google Patents
Method of switching Download PDFInfo
- Publication number
- GB2323244A GB2323244A GB9705301A GB9705301A GB2323244A GB 2323244 A GB2323244 A GB 2323244A GB 9705301 A GB9705301 A GB 9705301A GB 9705301 A GB9705301 A GB 9705301A GB 2323244 A GB2323244 A GB 2323244A
- Authority
- GB
- United Kingdom
- Prior art keywords
- telephone
- cpu
- branch
- code number
- tone
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/02—Arrangements for interconnection not involving centralised switching involving a common line for all parties
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
- A63C17/00—Roller skates; Skate-boards
- A63C17/26—Roller skates; Skate-boards with special auxiliary arrangements, e.g. illuminating, marking, or push-off devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/71—Substation extension arrangements
- H04M1/715—Substation extension arrangements using two or more extensions per line
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Function (AREA)
Abstract
A method of switching a telephone call between branch telephones of a shared-line telephone system including the step of storing respective branch telephone code numbers in respective branch telephones through a respective key pad, the step of inputting the branch telephone code number of the designated branch telephone through the key pad of the picked up branch telephone, causing the designated branch telephone to be rung up.
Description
Title - METHOD OF SWITCHING
The present invention relates to a method of switching a telephone call between branch telephones without using a telephone exchange. The invention relates also to telephone apparatus for the method.
Regular telephone exchange e systems are commonly heavy and expensive, and require much installation space.
Further, only experience4 engineers can install telephone exchange systems. Therefore, regular telephone exchange systems are commonly used in big offices and business places.
For small offices or families, it is not economic to install a telephone exchang e system. Without having a telephone exchange system, people may have to call one another personally or by voice when to switch a telephone call from one branch telephone to another. Ho-wever, calling people by voice makes noises.
The present invention has been accomplished to provide a telephone apparatus with the function of switching a telephone call
between branch telephones which eliminates the aforesaid
problems. According to the method and apparatus of the present
invention, telephone users can store respective branch telephone
code numbers in respective branch telephones through a respective
key pad, so that a telephone call can be switched from one branch
telephone to another by inputting the branch telephone code
number of the designated branch telephone through the key pad of
the picked up branch telephone. A telephone apparatus in
accordance with the present invention comprises a DTMF signal
receiver. When a first branch telephone receives a DTMF signal
from a second branch telephone, the DTMF signal is decoded into a
corresponding code signal by the DTMF signal receiver of the first
branch telephone, and then compared by the CPU of the first
branch telephone with the code number stored in the storage device
thereof, so that the first branch telephone is rung up when the code
number from the DTMF receiver is identified in conformity with
the code number from the storage device.
The invention will now be described further by way of example with reference to the accompanying drawings in which:
Fig. 1 is a circuit block diagram of a telephone apparatus
according to the present invention;
Fig. 2 is block diagram showing the switching of a phone
call according to the present invention (the dotted line indicates the operation of the circuit of the telephone of the switching side; the real line indicates the operation of the circuit of the telephone of the side being switched;
Fig. 3 is a control flow chart of the telephone apparatus according to the present invention; and
Fig. 4 is a circuit diagram of a DTMF signal receiver according to the present invention.
Referring to Figure 1, the code numbers of branch telephones are set through a key pad 11 of a telephone 10, and stored in a storage device 13. When to switch a phone call to one branch telephone, the user of the telephone 10 can directly input the code number of the designated branch telephone through the key pad 11, thereby causing the designated branch telephone to send a corresponding DTMF signal to the other linked branch telephones. Upon receipt of the DTMF signal, the DTMF signal receiver 14 of each branch telephone immediately decodes the signal, and compares it with the value of the respective branch code number stored in the storage device thereof by the respective CPU.
When the DTMF signal is identified equal to the value of the branch code number of a particular branch telephone, such a particular branch telephone immediately gives a rhythmical sound informing its user of the incoming of a telephone call.
Referring to Figure 1 again, the telephone 10 comprises a key pad 11, a CPU 12, a storage device 13, a DTMF signal receiver 14, a DTMF signal generator 15, a telephone line 16, a tone generator 17, a tone amplifier 18, and a speaker 19. The other basic circuit structures, such as ringing circuit, dialing loop and display unit, etc., are of the known art and not within the scope of the present invention, therefore they are neither shown in Figure 1 nor described herein in detail.
Through the number keys and function keys of the key pad 11, the code numbers of all branch telephones are inputted into the telephone 10, and stored in the storage device 13 by the CPU 12.
The DTMF signal receiver 14 is connected to the telephone line 16.
When the telephone 10 receives a DTMF signal from one branch telephone through the telephone line 16, the dual-frequency DTMF signal which contains a high frequency signal and a low frequency signal is immediately decoded into a 4-digit digital signal by the
DTMF signal receiver 14, and then the 4-digit digital signal is sent by the DTMF signal receiver 14 to the CPU 12 for comparison with the value of the code number stored in the storage device 13. If the comparison result is positive, the CPU 12 immediately gives a signal to the tone generator 17, causing it to produce a series tone signal. The tone signal from the tone generator 17 is then amplified by the tone amplifier 18, and then set out through the speaker 19, and therefore a series of sound is produced through the speaker 19, calling the user to pick up the handset of the telephone 10. If the comparison result is negative, the telephone does no work.
Referring to Figures 2 and 3, when one branch telephone users receives a telephone call for the user of another branch telephone from the exchange line, it can easily be switched to the branch telephone of the called part as follows: 1. When one particular branch telephone for example the first
branch telephone receives a telephone call from the exchange
line and rings a tone, the user of the first branch telephone finds
that the telephone call is for calling the user of another branch
telephone for example the second branch telephone, the user of
the first branch telephone can then input the code number "#2"
of the second branch telephone through the key pad of the first
branch telephone.
2. When the CPU 12 of the first branch telephone receives the
code number "#2" of the second branch telephone from the key
pad 11 of the first branch telephone, it immediately controls the
DTMF signal generator 15 of the first branch telephone
produces a DTMF signal corresponding to the code number of
the second branch telephone.
3. The DTMF signal from the DTMF signal generator of the first
branch telephone is then transmitted through the telephone line
16 to the second branch telephone.
The second branch telephone is then operated as follows: 1. The DTMF signal from the first branch telephone through the
telephone line 16 is decoded into a code number by the DTMF
signal receiver 14 of the second branch telephone, and then sent
to the CPU 12 of the second branch telephone. Figure 4 shows
the circuit diagram of the DTMF signal receiver 14, in which
contacts P11, P12, P13, P14, P15 and P16 are respectively
connected to the CPU 12.
2. When the CPU 12 of the second branch telephone receives the
code number from the DTMF signal receiver 14, the CPU 12 of
the second branch telephone immediately compares the code
number with the code number stored in the storage device 13 of
the second branch telephone. If the received code number
signal is confirmed in conformity with the code number stored
in the storage device 13, the CPU 12 immediately drives the
tone generator 17, causing it to produce a tone signal, and at the
same time the internal counter of the CPU 12 is started to count.
If the received code number signal is rejected, the tone
generator 17 of the second branch telephone does no work.
3. The tone signal from the tone generator 17 of the second branch
telephone is then amplified by the tone amplifier 18 thereof,
and then driven out of the respective speaker 19.
4. When the handset of the second branch telephone is picked up
by the user, the telephone line 16 of the second branch
telephone immediately produces a signal to the CPU 12 of the
second branch telephone, causing it to stop the tone generator
18 of the second branch telephone and its internal counter.
5. If the handset of the second branch telephone is not picked up a
predetermined length of time after the production of the tone
through the speaker 19 of the second branch telephone, the CPU
12 of the second branch telephone immediately produces a stop
signal to the tone generator 18 of the second branch telephone,
causing it to stop the tone signal, and at the same time the
internal counter of the CPU 12 of the second branch telephone
is stopped.
It is to be understood that the drawings are designed for purposes of illustration only, and are not intended as a definition of the limits and scope of the invention disclosed.
Claims (9)
1. A method of switching a telephone call between branch telephones, including the steps of:
i) inputting respective code numbers of a set of linked branch telephones into respective branch telephones through- a respective key pad, permitting the inputted code numbers to be stored in a respective storage device by a respective CPU (central processing unit);
ii) upon receipt of a DTMF signal by one branch telephone from another branch telephone through a telephone line, a DTMF signal receiver of the called branch telephone being driven to decode the DTMF signal into a decoded code number, and to send the decoded code number to the CPU thereof;
iii) enabling the CPU of the called branch telephone to compare the decoded code number with the code number stored in the storage device thereof, and to drive a tone generator of the called branch telephone causing it to produce a series tone signal when the decoded code number is identified in conformity with the stored code number of the called branch telephone, or not to drive the tone generator when the decoded code number is not in conformity with the stored code number.
2. The method of claim 1 further comprising the step of permitting the tone signal from the tone generator to be amplified by a tone amplifier and then driven out of a speaker.
3. The method of claim 1 further comprising the step of driving the called branch telephone to produce a signal to its CPU when the called branch telephone is picked by the user to answer the call, causing the CPU to stop the tone generator from producing the tone signal.
4. The method of claim 1 further comprising the step of driving the CPU to stop the tone generator from producing the tone signal a predetermined length of time after the production of the tone signal.
5. A telephone apparatus for the method of claim 1, comprising:
a CPU (central processing unit);
a key pad connected to said CPU and having number keys and function keys for input of a code number;
a storage device connected to said CPU and controlled by it to store the code number inputted through said key pad;
a telephone line connected to said CPU and controlled by it to receive a telephone call from linked branch telephones or an exchange line;
a DTMF signal receiver connected between said CPU and said telephone line, and adapted for decoding a DTMF signal received from one linked branch telephone through said telephone line into a digital signal and sending the decoded digital signal to said CPU; and
a tone generator connected to said CPU and controlled by it to produce a series tone signal;
wherein when the telephone receives a DTMF signal from one linked branch telephone, the DTMF signal is immediately sent to said DTMF signal receiver and decoded by it into a corresponding code number, permitting the decoded code number to be sent to said CPU for comparison with the code number stored in said storage device, so that said CPU drives said tone generator to produce a series tone signal when the code number from said
DTMF signal receiver is identified in conformity with the code number from said storage device, or does not drive said tone generator when the code number from said DTMF signal receiver is not in conformity with the code number from said storage device.
6. The telephone apparatus of claim 5 further comprising a tone amplifier controlled by said CPU to amplify the tone signal from said tone generator, and a speaker controlled by said CPU to output the amplified tone signal from said tone amplifier.
7. The telephone apparatus of claim 5 further comprising a
DTMF signal generator connected between said CPU and said telephone line, and controlled by a code number inputted from said key pad to produce a DTMF signal, permitting it to be transmitted through said telephone line to ring up one designated branch telephone.
8. A method of switching a telephone call between
branch telephones substantially as herein described with
reference to and as illustrated in the accompanying drawings.
9. A telephone apparatus substantially as herein described with reference to and as illustrated in the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9705301A GB2323244A (en) | 1997-03-14 | 1997-03-14 | Method of switching |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9705301A GB2323244A (en) | 1997-03-14 | 1997-03-14 | Method of switching |
US08/825,669 US5810450A (en) | 1997-03-21 | 1997-04-03 | Wheel assembly with lighting circuit |
FR9704764A FR2762471B3 (en) | 1997-03-21 | 1997-04-17 | WHEEL ASSEMBLY PROVIDED WITH A LIGHTING CIRCUIT |
Publications (2)
Publication Number | Publication Date |
---|---|
GB9705301D0 GB9705301D0 (en) | 1997-04-30 |
GB2323244A true GB2323244A (en) | 1998-09-16 |
Family
ID=27253313
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9705301A Withdrawn GB2323244A (en) | 1997-03-14 | 1997-03-14 | Method of switching |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2323244A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101287558B (en) * | 2005-05-20 | 2010-05-26 | Sms西马格股份公司 | Method of and apparatus for manufacturing a metal strip |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4958370A (en) * | 1987-04-03 | 1990-09-18 | Kabushiki Kaisha Toshiba | Control system for a plurality of telephone sets |
WO1996021306A1 (en) * | 1995-01-03 | 1996-07-11 | Eisenberg & Co., U.S.A. Agency Inc. | An improved telephone extension unit and system for use therewith |
-
1997
- 1997-03-14 GB GB9705301A patent/GB2323244A/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4958370A (en) * | 1987-04-03 | 1990-09-18 | Kabushiki Kaisha Toshiba | Control system for a plurality of telephone sets |
WO1996021306A1 (en) * | 1995-01-03 | 1996-07-11 | Eisenberg & Co., U.S.A. Agency Inc. | An improved telephone extension unit and system for use therewith |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101287558B (en) * | 2005-05-20 | 2010-05-26 | Sms西马格股份公司 | Method of and apparatus for manufacturing a metal strip |
Also Published As
Publication number | Publication date |
---|---|
GB9705301D0 (en) | 1997-04-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |