JPS6412430B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a dial number control method for converting a specific dial number into a special number before transmitting it in a charge-type public telephone. Charge-type public telephones generally allow dialing by inserting coins after off-duty, but
Emergency calls to the police, fire department, etc. must be made by dialing and making calls free of charge.Furthermore, in order to prevent long-distance calls from public telephones for local use, calls to long-distance numbers and long-distance relay stations must be allowed. These functions must be made impossible by electronic circuits, and the "dial number control circuit" (Japanese Patent Application No. 152575-1981), which was filed separately by the applicant, is proposed.
is disclosed. However, in the same application, various logic circuits such as counters and decoders are used, and it is necessary to connect strap terminals according to specific dial numbers that should be allowed to make free calls or should not be able to make calls. At the same time, the number of digits of a specific dial number that can be handled is limited by the configuration at the time of manufacture. The strap had to be changed, which resulted in a lack of adaptability and, at the same time, the disadvantage of being cumbersome to handle. On the other hand, in certain countries, when dialing a specific dial number, the dial number is converted to a special number in order to connect to a service desk such as an information desk or troubleshooting desk. There is a growing need for public telephones to automatically meet this demand. The present invention has the purpose of fundamentally solving such drawbacks of the conventional technology and completely satisfying the requirements.
A specific multi-digit dial number is stored in the first memory in advance, and before the dial number corresponding to the dial operation is sent out to the railway, it is sequentially stored in the second memory, and the contents of the first memory and the second memory are The present invention provides an extremely effective dial number control system in which the contents of the second memory are compared, and the contents of the second memory are converted into corresponding dial signals according to the comparison results, and the dial signals are sequentially sent to the line. Hereinafter, details of the present invention will be explained with reference to figures showing examples. FIG. 1 is a block diagram showing the entire configuration, in which the line terminal L is connected to the exchange via the line,
The off-hook turns on the switch HS ₁ and closes a DC loop between the dial circuit DIC and the telephone call circuit TEL. In addition, the dial circuit DIC is equipped with a transistor inserted in series with the DC loop circuit, and although it is always on, it is turned on and off in response to the dial signal DP from the dial sending circuit DSC. , thereby sending a dial pulse according to the dial number to the line. Note that the dial sending circuit DSC receives a selection signal from the control unit CPU via the input/output circuit I/O.
It is determined whether to send a dial pulse or a multi-frequency signal for dialing according to DPEN and MFEN, and whether to send a dial signal DP for sending a dial pulse or a multi-frequency dial signal MF according to the number signal KYOU. The multi-frequency dial signal MF is transmitted from the telephone circuit TEL.
It is sent to the railway line via. In addition, while a series of dial pulses are being sent by the dial signal DP, the handset control signal RMT is sent, which cuts off the handset circuit in the telephone call circuit TEL, so that the operator is not given pulse noise due to the dial pulses. It has become something that does not exist. In addition, if the coin detection circuit CDT detects insertion curing, it will generate a coin detection signal CDS, and if the hook switch HS ₂ is turned on due to off-hook, it will generate an off-hook signal FHS, both of which are sent to the input/output circuit I/O. It has become a given,
According to these, the control unit CPU operates according to the instructions stored in advance in the fixed memory ROM as the first memory, and while accessing the necessary data to the variable memory RAM as the second memory, Executes control operations. 2 to 4 are flowcharts of control operations by the control unit CPU. FIG. 2 shows the main routine, the "dial number verification" step in the figure is shown in FIG. 3, and the "dial processing" step is shown in FIG. ``The steps are as shown in Figure 4. That is, in FIG. 2, the off-hook signal
If “On Hook?” becomes YES due to the occurrence of FHS, the control unit CPU starts operating based on the instructions stored in the fixed memory ROM in advance.
After setting the initial state using "Initialize", it is determined whether dial control such as "Dial number verification" and "Dial processing" has been completed using "Dial control completed?". Perform "dial STEN set" via the pushbutton dial PBD, prepare to receive the probe signal ST generated in response to the operation of the pushbutton dial PBD, and then select "dial ST?" in response to the generation of the probe signal ST.
YES, the dial number signal DID corresponding to the operation of the pushbutton dial PBD is changed to “Dial number/
"Storage" stores the signal to a predetermined address in the variable memory RAM, and "Dial STEN Reset" terminates the acceptance of the probe signal ST.Next, it checks whether the group flag described later is zero or not by "Group Plug = 0?" ”, and in response to YES, “dial number verification” and “dial processing” are performed, and then again “Dial control completed? ”, and then check whether or not a billing signal has arrived from the station via YES. ”, and if it turns out to be YES, it is input by “billing signal processing”, the waiting hardening is stored, and then the “talking state” is entered. In the “verification processing” in FIG.
The group counter in the CPU is initialized by "Group counter ← 1", and the contents of this are set to "1", and then " After performing “reset”, the fixed memory is reset using a separate address counter.
Address specification from the first address that stores a specific dial number in ROM and variable memory RAM
By specifying the address from the first address that stores the dial number, a "specific dial number storage address set" and a "dial number storage address set" are created, and each memory
The contents of the ROM and RAM are read out, and "comparison of each digit" is performed in the control unit CPU. The storage status of specific dial numbers in the fixed memory ROM is as shown in the table below, which shows an example, and a digit end code indicated by F in hexadecimal is added to the last digit of each number. At the same time, a group end code indicated by hexadecimal numbers E and E is inserted at the end of each prohibited number group to local number group.

【table】

[Table] Therefore, fixed memory ROM address “00”
~ If we sequentially compare “03” with number 1020 for each digit, the detection of “digit end code?” will be YES due to data “F0”, and if the result is YES of “mismatch?” For example, the “mismatch flag set” corresponding to “mismatch flag?” on the right side of the diagram
are carried out, YES for “Inconsistency Flag?”, NO for “Group Code” and “Group Counter End?” ”
A similar comparison operation is performed up to address 06 via the NO of . Also, if "Group end code?" is YES at address "07", the group counter is set to "1" by "Group counter increment".
One step is registered from ``2'' to ``2'', but since the count is not full yet, ``Group Counter''
End? ” Now through the NO address “08”
Comparison of ~ “26” is performed in the same way as above, and if “no match?” is not returned during this time, “group end code?” is determined at addresses “0F”, “13”, “1D”, and “26”. The result is YES, and the group counter is successively registered from "1" to "6" by "Group counter increment", thereby achieving a full count state, and "Group counter end?" is set to YES. Although not shown in the table above, in addition to local numbers, there are also other groups such as paid calls such as time signals and weather forecasts. “Group counter end” becomes YES,
And YES if the “dial number” is “5 digits or more?”
If so, “group flag ← group counter”
The group flag is set according to the count value of the group counter. However, for the local numbers in the table above, only the first digit is compared, and numbers after the second digit are ignored. Also, depending on the NO of the "Unmatched Flag?" based on the NO of the "Unmatched?", if any of the comparison results match, the "Unmatched Flag is reset" and the "Dial Flag → Group Counter" is immediately set. It is done. In Figure 4, the group flag set by "Group Flag ← Group Counter" in Figure 3 indicates a value corresponding to each group of prohibited numbers to local numbers in the table above. ``Group flag?'' or ``Group flag or?'' is determined, and YES for ``Group flag?'' is a prohibited number in the table above, so the call is blocked by ``loop disconnection'' and ``Group flag?'' is determined. If the group flag or" is YES, since it is a toll-free number or a toll number in the table above, "code conversion" is performed to a code indicating a dial signal according to the contents of the variable memory RAM, and the number signal KYOU is sent to the dial sending circuit DSC. "Dial transmission" is performed as a dial pulse or multi-frequency signal. Also, if "Group flag?" is YES, the conversion number in the above table that characterizes the present invention is used, and the control unit CPU uses the "data conversion" to connect to the predetermined switchboard with the number 001,
After converting to a special number such as 101, “code conversion”
``Dialing'' of a special number is performed. For these, “group flag or”
YES is a paid call for local numbers listed above or for time signals, weather forecasts, etc. other than those listed above.
After determining whether there is a coin present using the coin detection signal CDS, "code conversion" and "dial transmission" are carried out in response to a YES response to the coin detection signal CDS.On the other hand, if there is no coin present, the loop is disconnected. ” will be carried out. In addition, in the NO of “group flag or”,
Since the dial control is not completed and the "Dial control completed?" question next to "Dial processing" in FIG. 2 becomes NO, the process returns to the beginning and repeats each process. FIG. 5 is a circuit diagram of the dial sending circuit DSC, which includes a pulse generator DPG using an integrated circuit for dial pulse generation and an oscillator MFG using an integrated circuit for generating multi-frequency signals. Pulse selection signal determined by SW
DPEN and multi-frequency selection signal MFEN are given, and when the switch SW is set to the pulse signal PS, the pulse generator DPG is in the operating state, and when the switch SW is set to the multi-frequency signal FS, the oscillator MFG is set to the operating state, and the input/output circuit is Pulse dial signal DP or multi-frequency dial signal according to 8-bit number signal KYOU given via I/O
MF is sent. In addition, since the pulse generator DPG and oscillator MFG send out a status signal while the dial signals DP and MF are being sent out, these signals pass through the OR gate G and are sent out as a handset control signal, as well as from the oscillator MFG. is a direct, sending signal
It is supposed to be sent as TMT. Note that resistors R ₁ to R ₃ and capacitor C ₁ are
It is used to determine the pulse width and mark/space ratio of the dial pulse, and the crystal blank X is used to determine the reference frequency of the multi-frequency signal. Figure 6 shows the dial circuit DIC and the telephone circuit TEL.
This is a circuit diagram in which DC voltage from the exchange is applied between circuits L ₁ and L ₂ connected to line terminal L via switch HS ₁ ,
A diode bridge DB is inserted to maintain a constant polarity regardless of the applied polarity, and the common circuit side is set to negative polarity. Between the positive pole of the diode bridge DB and the common circuit, there are relay contacts gs that operate in conjunction with the switch HS ₁ and HS ₂ , transistors Q ₁ to Q ₃ for the dial circuit DIC, and resistors R ₁₁ to _R15 ,
A circuit network TKN using an integrated circuit for a communication circuit via an amplifying transistor Q ₄ , and voltage regulator diodes D ₁ to _{D 5} and a capacitor C ₁₁ for a power supply circuit.
~C ₁₃ is inserted, and when the DC loop is closed by the operation of contact gs, transistor Q ₃ is turned on because the dial signal DP is always at a high level, and transistors Q ₂ and Q ₁ are turned on in turn. It is turned on by applying a directional bias. On the other hand, if the dial signal becomes low level in a pulsed manner, transistor _Q3 turns off, so
Transistors Q ₂ and Q ₁ are also turned off, and by repeating this, a dial pulse corresponding to the dial signal DP is sent to the line. Note that the continuous low level of the dial signal DP causes the DC loop to be disconnected. The power supply circuit uses the Zener voltage of the constant voltage diode ZD ₁ generated by the loop current to connect the capacitor to the capacitor via the reverse current blocking diodes D ₂ , D ₄ and D ₅ .
After charging C ₁₁ to _{C 13} individually, these terminal voltages are supplied as power supplies for various parts such as VEE, VMG, VDD, etc. However, because the capacitors C ₁₁ to C ₁₃ have large capacities, even when not talking, In order to keep these charged, diodes D ₁ and D ₃ are provided along with a contact gs, a current limiting resistor R ₁₆ and a constant voltage diode ZD ₂ . In addition, as the circuit network TKN, an integrated circuit such as TEA-1045 type (manufactured by ITT) is used, and the receiver R is connected via a capacitor _C14 , and a field effect transistor is connected to the common circuit side of the integrated circuit. _Q5 ,
If Q ₆ is inserted and the handset control signal RMT, which is always at a high level, becomes a low level, the transistor
Since Q ₅ and Q ₆ are turned off, noise and the like are prevented from being transmitted to the receiver R. The audio signal from the transmitter T is subjected to sidetone attenuation by an amplifier circuit in the network TKN and is applied to the receiver R, while being properly biased by resistors _R17 , _R18 and diode _D6 . The received voice signal is amplified by the transistor _Q4 and sent to the line, but the received voice signal is given through a circuit of resistors _R19 , _R20 and capacitors _C15 , _C16 , and the received voice signal is amplified by the resistor _R21 . , and capacitor C ₁₇ together with resistors R ₁₉ , R ₂₀ and capacitor C ₁₅ to set the sidetone reduction amount. Note that the circuit network TKN includes the oscillator MFG shown in Figure 5.
A multi-frequency dial signal MF from MF and a sending signal TMT indicating that this is being sent are given,
In response to the sending signal TMT, a switch is made within the network TKN, and the dial signal MF is sent to the line via the transistor _Q4 . However, specific dial numbers such as toll-free numbers and prohibited numbers can be arbitrarily determined depending on the type of service and the number of digits, and the address of the fixed memory ROM is prepared accordingly. Various modifications can be made, such as just setting the full count of the group counter, and controlling controls such as free calls and "loop disconnection" depending on the content of the transaction. In addition, if the fixed memory ROM is made removable by attaching it to a socket, it is possible to set a specific dial number and the corresponding control contents as desired by replacing it, which increases adaptability to the area where the public telephone is installed. , it becomes extremely easy to set specific dial numbers and control details. As is clear from the above explanation, according to the present invention, the dial number corresponding to the operation is accurately compared with the specific dial number including prohibited and toll-free numbers, and control based on this is reliably performed. The converted number can be converted to another special dialed number and sent. For example, if the conversion number is an international call number, when the international call is dialed, the data is converted from the second memory and sent to the line, and the conversion board is called. Therefore, even in the case where immediate dialing is not possible, the call is not interrupted or busy, and the call is accepted by the converter, making it possible to provide a comfortable and friendly service to the user. Furthermore, since it becomes easy to set a specific dial number and control details, the versatility of the charge-type public telephone and the ease of setting operations are greatly improved, and remarkable effects can be obtained in charge-type public telephones for various purposes.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; FIG. 1 is a block diagram of the entire configuration, FIGS. 2 to 4 are flowcharts showing the control operation of the control section, FIG. 5 is a circuit diagram of the dial sending circuit, and FIG. FIG. 6 is a circuit diagram of a dial circuit and a telephone call circuit. CPU...Control unit, ROM...Fixed memory (first
memory), RAM...variable memory (second memory),
I/O...Input/output circuit, PBD...Push button dial, DSC...Dial sending circuit, DIC...Dial circuit, TEL...Telephone circuit.

Claims (1)

[Scope of Claims] 1. A first memory that stores a predetermined multi-digit specific dial number, a second memory that sequentially stores dial numbers in response to a dial operation before being sent out to the railway, and the second memory. and a control unit that compares the contents of the second memory with the contents of the first memory and converts the contents of the second memory into a predetermined dial signal corresponding to the contents according to the comparison result, the dial after conversion. A dial number control system characterized by sending signals sequentially to the line.