JPH0517759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a dialed number identification device that identifies dialed numbers after a communication path is set up.

(Prior Art) Existing telephone terminals can be roughly divided into dial-pulse type and push-button type.

Even after the communication path has been set, the latter terminal can easily send numeric information to the network device or the other party's terminal by pressing the dial button. Various services are being implemented.

However, although the former type of terminals still make up the majority of all telephone terminals, their dials can only be used to select a communication partner.
That is, once a party's number has been dialed, the dialing board cannot be used to deliver digits.

Therefore, it is very difficult to implement advanced services that require the terminal user to make choices depending on the service situation.

Another problem is that even though users subscribe to the same communication network, there are large differences in the services they can receive depending on the type of terminal.

(Problems to be Solved by the Invention) The purpose of the present invention is to detect and measure electrical shock vibrations generated by dial operations after a communication path is established between a caller and a called party. By means of obtaining numerical information directly from the terminal,
The goal is to use that numerical information to improve the convenience of communication services.

(Structure of the Invention) (Means for Solving the Problems) The present invention is capable of expressing the duration of an electric shock vibration train transmitted from a terminal as a function of dialed numbers, and a coefficient of the function. This is a device that determines dialed digits by determining the number in advance and using the measured duration and the above function.

First, the properties of the electric shock vibration train handled by the present invention will be explained.

Figure 1 shows the electrical shock observed at the network side or at the entrance to the other party's terminal from the subscriber exchange accommodating the terminal when dialing from a dial-pulse telephone terminal after a communication path has been established. It shows the waveform configuration of a vibration train.

The reason why these shock vibration trains occur is that electric power is supplied to the telephone terminal from the local exchange, and the telephone terminal and the local exchange form an electrical closed loop. The closed loop is also electrically continued when the telephone terminal is dialed. Therefore,
This is because when dialing from a telephone terminal with a call path set, an electrical transient occurs between the terminal and the subscriber exchange, and this propagates through the call path.

The shock vibration train is usually roughly divided into the following three parts.

Part A: Occurs when you put your finger on the dial and start rotating it clockwise, the audio-related circuit inside the telephone is temporarily disconnected, and the contact for dial pulse generation is connected in the direction of the subscriber's line.

Part B: Finish rotating the dial clockwise,
This occurs when the dial spontaneously rotates counterclockwise when the finger is released, electrically continuing the subscriber line.

Part C: Just before the dial finishes rotating,
This occurs when the contact for generating dial pulses is disconnected from the subscriber's line and reconnected to the voice-related circuit inside the telephone.

Furthermore, for convenience of processing description, the time relationships among these three parts are defined as T ₁ to _{T 3} as shown in FIG. 1. Among these, T ₃ corresponds to a specific section,
From the start of the vibration representing the first dial number,
Since it is defined by the autonomous accuracy of the dial mechanism up to the beginning of the last vibration, it is applicable to the operation of the present invention.

FIG. 2 is a diagram showing an example of a shock vibration train that has passed through a network device, where a to f are dial numbers 1 to 6, respectively, and the shock vibration train that occurs at that time is transmitted to the opposite terminal. This is what was observed at the entrance.

In these figures, portion A is not shown in the figures because it occurs at a relatively earlier point in time than portions B and C.

Next, the principle of identifying dialed numbers from the characteristics of these impact vibration sequences will be explained.

FIG. 3 is a plot of the dialed digit N and the duration of the _T3 portion based on the measurement example of FIG. 2.

As is clear from this graph, for example, T ₃ can be described as a linear function of N. That is, by knowing the coefficients a and b in advance and measuring the time _T3 , the dialed number can be determined.

FIG. 4 shows a specific example of the identification method, and when the measured value of T ₃ is p ₀ or p ₁ , it is determined that the dial number is n based on the relational expression written in the figure.

To avoid misrecognition, consideration must be given to measurement values such as p ₂ , such as not giving identification results, but rejecting them and encouraging retrials.

(Example) Fig. 5 shows an example of the configuration of a device to which the present invention is applied. In [Example 1], the process up to the detection of the shock vibration waveform is performed using an analog hardware circuit, and the subsequent processes are performed using a microprocessor, etc. Executed under program control.

[Example 2] is a method in which the impact vibration waveform is once converted into a digital signal, and then the subsequent steps are executed under program control using a microprocessor or the like.

[Example 3] utilizes impact vibration waveform information when it is given as a digitally encoded signal.

[Example 4] shows a method in which an amount equivalent to the amount of energy of an impact vibration train in each minute time interval is measured, and the presence of an impact vibration train is determined based on the increase thereof.

Note that the devices of these embodiments are installed inside the telephone terminal,
It can be additionally installed at necessary locations, such as the subscriber circuit of a subscriber exchange, the line support section of a transit exchange, or the entrance of a network center.

In these embodiments, 1 is an analog matching circuit for AC electrically connecting the present device to a communication path of an existing device, such as a telephone terminal or an exchange, and capturing the above-mentioned pulse train; 2 is an analog matching circuit of the present invention. 300Hz~ attenuates non-target audio information and facilitates detection of impact vibration waveforms
Bandpass filter 3, which has a pass band of about 1 KHz, adjusts the impact vibration part to about the maximum electrical amplitude that can be handled by the device of the present invention, so that the amplitude is almost constant, and other than impact vibration 4 is an automatic gain adjustment circuit that improves the detection accuracy of the shock vibration waveform by amplifying or attenuating the input waveform to such an extent that the part of the input waveform has an amplitude that can be distinguished from the shock vibration part; An impact vibration detection circuit using a Schmitt trigger circuit or the like detects the impact vibration when it reaches the target and temporarily holds it for a fixed period of time. An input/output circuit for outputting the dial digits; 7 is a time measuring circuit for measuring the duration of _T3 mentioned above; this function may be replaced by a software timer by circuit 12; .

10 stores a control program, and
A memory circuit 11 is used for temporarily saving intermediate information during processing, and 11 is a control circuit composed of a microprocessor or the like that executes program control.12 is a control circuit mainly composed of the control circuit 11. ,
This is a signal processing circuit that performs dial digit discrimination.

In addition, 13 is a code conversion circuit that converts the input waveform into a digital signal such as a PCM code, and 14 is a circuit that electrically connects this device to a digital line part, a communication path, etc., and converts the aforementioned shock vibration train into digital code. 15 is a digital filter circuit that performs the same function as circuit 2 by digital code calculation; 16 is a digital filter circuit that captures the waveform in a wide amplitude range, It has the function of logarithmically compressing the input waveform amplitude so that it can be handled without adjusting the circuit constants.
Logarithmic compression amplifier circuit 17 rectifies the input waveform to obtain unipolar pulsating voltage; 18 time-integrates the pulsating voltage value at time intervals of several ms to several tens of ms. By methods such as
It is a sample-and-hold circuit that generates a voltage value corresponding to the amount of energy possessed by the shock vibration train within that time.

(Function) In order to explain these operations, first [Example 1] ~
In [Example 4], operations when shock vibration trains arrive at different parts will be explained.
Next, the operation of the parts common to each embodiment will be explained.

In the case of [Example 1], the unnecessary band of the shock vibration train is attenuated by the circuit 2, and the amplitude is adjusted to an appropriate amplitude by the circuit 3.

Next, the circuit 4 detects the rise of the impact vibration waveform.

Due to the effects of circuits 2 and 3, the probability that circuit 4 malfunctions can be extremely reduced. The circuit 4 self-retains the shock vibration detection information for several tens of milliseconds to a hundred and several tens of milliseconds, and in some cases, spontaneously reports the arrival of the shock vibration train to the circuit 12 through the circuit 5.

In the case of [Example 2], the shock vibration train that has passed through the circuit 3 is digitally encoded by the circuit 13. Here, in order to expect the same effect as in circuit 4 and to avoid malfunctions due to unnecessary noise, the sampling rate is preferably set to about several hundred to thousand times per second. The encoded numerical value string passes through the circuit 5 and is processed in the circuit 12.

In the case of [Example 3], the shock vibration code string input from the circuit 14 is often a PCM code with 8KHz sampling in the case of telephone voice. However, as it is, the circuit 15 can be expected to have the same effect as the circuit 2, since it includes audio information that is unnecessary for the present invention.

In addition, as a simple processing method corresponding to circuit 15, a method of averaging the numerical values of several samples before or after a certain sample value and outputting it as a new sample value can also obtain sufficient practical effects. I can do it.

In the case of [Example 4], the shock vibration train input from circuit 1 to circuit 16 is logarithmically compressed, rectified in circuit 17 to become a pulsating current, and input to circuit 18. In circuit 18,
It outputs a DC voltage whose voltage value changes at regular time intervals depending on the presence or absence of impact vibration.

Here, the circuits 16 to 18 may be constructed by applying the construction technology of a level display circuit used in an audio device or the like, which not only increases the ease of circuit construction but also helps to improve the economical efficiency of the circuit.

Here, the detection method of the present invention will be explained.

[Example 1] to [Example 3] in FIG. 5 are cases in which the detection means detects by a vibration waveform.

Since the circuits 1 to 3, 13, 14 and 15 are not intended to process the vibration waveform itself, instantaneous voltages or samples substantially similar to the vibration waveform are input to the circuit 5. For example, when the instantaneous voltage or sample value of a waveform, which has been concentrated near the electrical midpoint, now exists away from the midpoint,
If this state continues for a certain period of time, the circuit 12 may determine that it has started.

Conversely, for example, when the instantaneous voltage or sample value of a waveform that has existed far from the electrical midpoint becomes concentrated near the midpoint, and if this state continues for a certain period of time, the circuit 12 can be judged as falling.

[Example 4] in FIG. 5 corresponds to a case where the detection means detects by electrical energy accompanying a vibration waveform.

The circuits 16 to 18 have a configuration often seen in level display circuits of audio devices, and the circuit 5 receives not the vibration waveform itself but a value corresponding to the energy of the waveform. Hereinafter, the circuit 12 may judge whether the energy rises or falls in the same manner as in Examples 1 to 3 shown in FIG.

Next, the processing in the circuit 12 will be explained with reference to FIG.

First, before recognizing the dial numbers, in order to determine the coefficients a and b of the linear function mentioned above, it is necessary to input known and different dial numbers twice, measure the value of T ₃ , and determine the coefficients by calculation. be.

This procedure is shown in Figure 6a.

For calculations, either create a program to be stored in circuit 12 to solve the following simultaneous equations for a and b, or install a dedicated circuit to perform numerical calculations in circuit 12.
This can be carried out by adding it to the system and having the circuit 11 control it.

T ₃₁ = aN ₁ + b T ₃₂ = aN ₂ + b However, T ₃₁ and N ₁ are the first T ₃ measurement value and dial input number, respectively, and T ₃₂ and N ₂ are the second T ₃ measurement value, respectively. and represents dial input digits.

Now, after a and b are known, then follow the steps in Figure 6b to find the unknown numbers.
By measuring T ₃ x as the value of T ₃ and calculating the following formula programmatically, the dial digit
Find _NX .

N _X =(T _3X -b)/a Since the keyboard in these procedures is the method of measuring T ₃ , this will be explained next using FIG. 7.

First, the circuit 11 operates to skip part A of the shock vibration train and reliably capture the beginning of part B. Since there is a time interval of at least several dial digits between part A and part B, identification is easy.

When the beginning of part B is captured, circuit 11 starts timing the circuit 7 and then operates to capture the end of part B. The end of portion B is determined, for example, as follows.

Based on the information from circuit 4 in [Example 1], circuit 18 in [Example 4], or circuit 5 in [Example 2] and [Example 3],
When the circuit 11 recognizes that the shock vibration train has changed to a non-detected state, the circuit 11 monitors the presence or absence of the shock vibration for a time longer than the time that the shock vibration train for one dial number is expected to continue; When the non-detection state continues, it is determined that part B has ended.

The process of electrical convergence of portion B is almost constant under the same measurement conditions regardless of the size of the dial number, so there is extremely little possibility that the above-mentioned termination judgment point will vary.

Once circuit 11 recognizes the end of portion B, it subsequently operates to ensure that portion C arrives.

Unlike the part B, the impact vibration does not persist in the part C, and the part C is independent and can be recognized separately from the part B.

When the beginning of portion C is captured, circuit 11 stops the time measurement of circuit 7 and reads out the measured value _T3 . Even if you do not use circuit 7, if you use a programmed software timer,
It is possible to measure time with an accuracy sufficient for the purpose of the invention. Then, the above-mentioned calculation is performed, each coefficient is calculated or the dial number is determined, and finally, the determined number is outputted through the circuit 6.

Furthermore, there are two types of pulse generation speeds for dial pulse type telephones: 10 pulses/second and 20 pulses/second. There may be cases in which the shock vibration train from both types of telephones needs to be determined together.

In addition, the specification of a telephone can be used to determine the parameters of a function for determining digits.Using this information, it is possible to determine the specifications of a telephone by asking the dialer to dial a known digit only once. ,
Since the object of the present invention can also be achieved, the effect is great.

In this case, by adding the following function to the above-mentioned program, the dialed digits can be identified without misrecognition.

That is, for example, a phone with 10 pulses/second and a phone with 20
If you want to identify a pulse-per-second phone, make sure you first dial a sufficiently large number, such as 0.

The program mentioned above includes a typical example of what you would expect for each dialing speed when dialing 0.
Values of T ₃ i.e. 10 pulses/s and 20 pulses/s
Set the value of seconds based on actual measurements. In this state, when the shock vibration train generated by the dial operation arrives, the type of phone is determined by determining whether the measured T ₃ value is close to one of the values set above. It is possible to distinguish between

The reason why it is preferable to have a sufficiently large number dialed is that _T3 includes the section from the end of part B to part C, which varies slightly from phone to phone. This is because the length of the section may affect the judgment of speed.

Furthermore, it is necessary to take into account that, depending on the electrical configuration of the terminal (especially recent electronic telephones, etc.), parts A and C of the shock vibration train may become unclear or disappear.

In this case, it is possible to deal with this by partially modifying the functions of the program described above, deleting the detection judgments of portions A and C in the example of the measurement method shown in FIG. 7, and measuring only the duration of portion B. By applying the duration of part B instead of _T3 in the above explanation, the dialed number can be determined without error.

With the configuration and method described above, it is possible to determine the digits dialed by the other party's terminal.

(Effects of the Invention) As explained above, the duration of the electrical shock vibration train that occurs when a terminal dials in a communication state is expressed as a function of the dialed number, and the coefficient of the function is expressed as a function of the dialed number. By adopting a method of determining dialed digits using the above function from the duration of the shock vibration train determined in advance and subsequently measured, the terminal can be Because it is possible to directly obtain numerical information from a telephone terminal, those involved in communication who use dial-pulse telephone terminals can achieve almost the same functions as push-button telephone terminals. This has the advantage of dramatically expanding the range of services.

In addition, for communication network managers, it is economical to carry out the present invention, since it is not necessary to update existing equipment at all, and it is only necessary to add the devices of the present invention to the necessary locations. The effect is large.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an observed electrical shock vibration train, Fig. 2 is an observation example of an impact vibration train that has passed through a network device, and Fig. 3 is a diagram showing the relationship between the number N and T ₃ .
FIG. 4 is a diagram showing a specific example of the identification method, FIG. 5 is a configuration example of a device to which the present invention is applied, FIG. 6 is a diagram showing an example of the operating procedure of the present invention, and FIG. 7 is a T ₃ section. FIG. 3 is a diagram showing an example of a measuring method. 1... Analog matching circuit, 2... Band pass filter, 3... Automatic gain adjustment circuit, 4... Shock vibration detection circuit, 5, 6... Input/output circuit, 7... Time measurement circuit, 10... Memory circuit, 11... control circuit, 12... signal processing circuit, 13... code conversion circuit, 14... digital matching circuit, 15... digital filter circuit, 16... logarithmic compression amplifier circuit, 17... rectifier circuit, 18...Sample/hold circuit.

Claims (1)

[Scope of Claims] 1. When a call channel between a dial pulse type telephone terminal and an exchange is set, the voice-related circuit in the telephone terminal is disconnected by operating the dial panel of the telephone terminal to generate a dial pulse. The first vibration train is an electrical shock vibration or vibration train that occurs when the contact point for the subscriber line is connected in the direction of the subscriber line, and the electricity that is generated when the subscriber line is electrically interrupted in accordance with the dialed digits. the second vibration train, which is a mechanical shock vibration or vibration train; and the electrical shock vibration that occurs when the contact point for generating dial pulses is switched from the subscriber line direction to the audio circuit of the telephone terminal after the dial pulse is sent to the exchange. or a detection means for detecting a third vibration train that is a vibration train, and a continuation of a specific section that is an interval from the beginning of the second vibration train detected by the detection means to the beginning of the third vibration train. a measuring means for measuring time; and when two different numbers notified in advance to the measuring means are dialed, each dial operation of each number corresponds to each of the two numbers dialed by the measuring means. function determining means for determining a function representing a relationship between the dialed number and the duration time from the duration time and the two different numbers; , a dialed numeral identification device characterized in that it has a determining means for determining the dialed digit based on the duration of the specific section measured by the measuring means and the function determined by the function determining means. . 2. The detection means detects the arrival of the first vibration train, the second vibration train, or the third vibration train as a rising edge of a vibration waveform, or that the vibration waveform is observed for a certain period of time. and detecting that the first vibration train, the second vibration train, or the third vibration train has arrived by detecting that the vibration waveform is not observed for a certain period of time. A dial number identification device according to claim 1. 3. The detection means detects the arrival of the first vibration train, the second vibration train, or the third vibration train as a rise of electrical energy accompanying the vibration waveform, or as a rise of electrical energy accompanying the vibration waveform. It is detected that the energy has been observed for a certain period of time, and the arrival of the first vibration train, the second vibration train, or the third vibration train is detected when the electrical energy accompanying the vibration waveform is constant. 2. The dial numeral identification device according to claim 1, wherein the dial numeral identification device detects the fact that it has not been observed for a period of time.