JPS5948587B2 - Multi-frequency dial signal selection transmission method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION J The present invention relates to electronic selection control means for selective transmission of multi-frequency dialing signals.

As is well known, push-button dial telephones have a built-in multi-frequency oscillator, and by selecting and pressing the dial switch buttons (0 to 9, Φ)j on the phone housing, low frequency oscillators can be activated. One of frequency AC and one of high group frequency AC
It is well known that a multi-frequency dial signal, which is a combination of two dial signals, is sent out to a telephone line. Push-button dial telephones are easier and faster to dial than rotary-dial telephones, but they also make it easier to remember the destination phone number:
It is desirable to be able to add an automatic dialing function called lever tri-dial, auto-dial, or one-touch dialing to push-button dialing telephones in order to reduce the noise and the number of times the dial switch must be pressed.

There are many embodiments in which an automatic dialing function is added to a rotary dial telephone. ) and the telephone line can generally be connected by a relay, so that electrostatic insulation between the telephone line and the numeric storage section can be easily achieved, preventing surge current from entering the numeric storage section from the telephone line, and In the unlikely event of a failure in numeric storage, the telephone line will not be affected.

However, since the multi-frequency oscillator of a push-button dial telephone line receives its power from the central office exchange through the telephone line, the multi-frequency oscillator must be coupled to the telephone line in a DC manner, and the multi-frequency oscillator must be connected to a relay. It is not possible to relay the data by using Therefore, it is necessary to take measures that allow the above-mentioned number storage section to transmit information to the multi-frequency oscillator in a state of electrostatic isolation. The present invention aims to provide means for achieving such an objective, and will be explained below. FIG. 1 is a diagram showing the main parts and related parts of the multi-frequency dial signal selective transmission system of the present invention.

In the figure, 1 is a telephone line, 2 is a transmitter T and a receiver R.
3 is a telephone communication network, 4 is a multi-frequency oscillator, 5 is a dial switch, and 6 is a dial switch that provides constant polarity for the communication network 3 and the multi-frequency oscillator 4 regardless of the polarity of the direct current supplied through the telephone line. This is a diode rectifier circuit for supplying direct current, and these constitute an essential part of a push-button dial telephone. When the handset 2 is picked up, the hook switches HS1 and HS2 are closed, and direct current is supplied from the central office via the telephone network 3 to the transmitter T. At this time, direct current is supplied to T from the communication network through line p, contact point c, and line q in the figure. However, when the button on the dial switch 5 is pressed, the common contact CK closes and the line p and line q are opened, cutting off the direct current to the transmitter T, and creating a path for the line q-CK, so that the direct current is connected to the terminal. a-
b as the power source for the multi-frequency oscillator 4. The multi-frequency oscillator has low group selection terminals L1, L2, and L3 as shown in the figure.
, L4, and high group selection terminals H1, H2, and H3.By short-circuiting one of the low group selection terminals and one of the high group selection terminals, one of the low group frequency ACs and one of the high group frequency ACs can be selected. The signal oscillates and is sent out from terminals a-b as a combined output to the telephone line via the communication network 3. The above is a known multi-frequency dial signal selection transmission method, and in the latest push-button dial telephones, the multi-frequency oscillator is one
Many of them are made up of individual semiconductor LSIs.

In the multi-frequency dial signal selection transmission method of the present invention,
A dial switch having two sets of contact matrices is used as a dial switch, and the row lines and column lines of the first set of contact matrices (the upper matrix in the figure) are connected to the low group selection terminal and the high group selection terminal of the multifrequency oscillator 4. Each wire is connected to the selected end.

The second set of contact matrices (in the illustration, dial switch 5
The use of the lower matrix) will be discussed later. 1st
In the figure, 7 (the part surrounded by a dashed line) indicates a number storage section.

There are various ways to configure the number storage section, but for ease of understanding, only the main components are shown in the diagram. Reference numeral 8 denotes a destination subscriber selection button switch, which generally has a dozen or more buttons arranged in a matrix.

Reference numeral 9 denotes a main control circuit (hereinafter abbreviated as CPU) of the numeric storage section, and these days, many circuits are mainly constructed from a dedicated LS.

10 is a random access memory circuit (hereinafter abbreviated as RAM) that stores the positional information of each button of the selection button switch 8 and the telephone number of the destination subscriber input by pressing each button in correspondence with each other, and is controlled by the CPU. Below the button position information and telephone number numbers are written and read.

Reference numeral 11 designates an (m+n)-bit latch circuit for temporarily storing telephone number digits read out from the RAM by the CPU one digit at a time, 12 a drive circuit, and 13 a photocoupler switch circuit.

An outline of the operation of FIG. 1 will be described below.

Registration of the destination subscriber telephone number is performed in the following manner.
First, when the telephone terminal user closes the registration switch MEK, the CPU obtains the closed position information of the second set of contact matrices of the destination subscriber selection switch 8 and the dial switch 5. It becomes a hidden state that can be accepted.

In this state, press one button, for example B1, in the destination subscriber selection switch 8, and then use the dial switch 5 to input the destination subscriber telephone number in the same manner as in normal manual dialing. . At this time, the CPU decodes the closed state of the second contact matrix of the dial switch 5, and stores the position information of the button B1 and the destination subscriber's telephone number in the RAM 10 as a pair. Next, after pressing button B2, the same operation as above is performed to store the location information of B2 and the destination subscriber's telephone number as a pair in the RAM 10.

This operation can be similarly performed for B3 and below, up to the maximum capacity of the destination subscriber selection switch. After completing the memory setting operation, the user of the telephone terminal restores the registration switch MEK and is ready to make automatic dial calls at any time.

To make a call using the automatic dialing function, proceed as follows. When the telephone terminal device user first picks up the handset 2,
Direct current is supplied from the central office exchange to the telephone network through the telephone line, and at the same time a dial tone is heard from the handset R (not shown, but in the case of the speaker reception method, if you press the off-hook button without picking up the handset, (A dial tone is heard from the speaker). When the telephone terminal user hears the dial tone and selects and presses the destination subscriber button in the destination subscriber selection switch 8, one of the selection switches 8
A short circuit is created between one row line and one column line, and the CPU decodes the destination subscriber's button position and reads out the telephone number digits stored at the corresponding address in the shrine. First, the first number is read out and temporarily stored in the latch circuit 11. In the embodiment of the present invention, the number of low group frequencies m = 4, and the number of high group frequencies n = 3. Therefore, 1 out of 4 and 1
It is stored in a 7-bit code format of 0utof3.

The accumulated 7-bit code format information is passed through the drive circuit 12 to one of the four photocouplers (K11, K12, Kl3, Kl4) of the first group of the photocoupler switch network 13, for example, to the light-emitting side element of Kl3. A current is passed through one of the three photocouplers (Kh1, Kh2, Kh3) of the second group, for example, the light-emitting element of Kh2. In this case, photocouplers Kl3 and K
h20 Each light-receiving side element exhibits a guiding state, and terminals L3-Kl
A low-resistance conductive path is formed between the light-receiving element of No. 3 and the light-receiving element of K12 and the terminal H2. Such a conductive path is Kl
It will be easily understood from the configuration of the illustrated photocoupler circuit network that it can be formed by any combination of one light-receiving element among 1 to KI4 and one light-receiving element from Kh1 to Kh3.

] On the other hand, a control signal from the CPU 9 passes through the drive circuit 14 and operates the relay C, and the operation of the relay C causes the contact C at the upper left of the figure to operate, and the line q passes through the make side of the contact C to the terminals a-b.
In between, a direct current from the central office exchange is applied, causing the multi-frequency oscillator 4 to oscillate.

The frequency that oscillates at this time is a composite AC of the low group frequency AC designated by the low group selection terminal L3 and the high group frequency AC designated by the high group selection terminal H2.

In the embodiment of the present invention, the time width of the control signal is about 55 milliseconds, and the minimum pause is about 70 milliseconds. Second
For the numbers below, a conductive path is formed between one of the low group selection terminals and one of the high group selection terminals in the same manner as for the first number, and a predetermined combination of low group frequency AC and high group frequency AC is performed. The combined alternating current is sent from terminals a-b to the telephone line via the telephone network 3. In the multi-frequency dial signal selection transmission system of the present invention, as seen in the embodiment shown in FIG. It is connected to the low group selection terminal of the oscillator, and the emitter of the light receiving side element of the second group of photocouplers is connected to the high group selection terminal of the multifrequency oscillator together with the column line of the dial switch 5. Therefore, the same multifrequency oscillator 4 selects a multifrequency dial signal for both manual dialing by pressing a button on the dial switch 5 and automatic dialing by pressing a destination button on the destination subscriber selection switch in the numeric storage section. Enables transmission.

Although FIG. 1 shows an embodiment of the present invention for a telephone terminal device called a so-called repertoire dial telephone or an auto-dial telephone, the present invention can also be applied to a case where a numeric storage section is provided in a computer. Needless to say. For example, the present invention is useful for application to crystal type NCUs (abbreviation for automatic call/manual call type network control units) that use multi-frequency dial signals as line selection signals. In other words, the telephone numbers instructed by the computer are converted into 1 0utof4 and 1 inside the navigation NCU (17).
After converting to outof3 7-bit information and storing it,
It is possible to provide a photocoupler switch circuit network with a configuration similar to that of the embodiment shown in FIG. 1, operate a multifrequency oscillator in an electrostatically insulated state, and send a multifrequency dial signal to the telephone line. be. In this case, the AA type NCU can be considered as a type of telephone terminal device and is included in the scope of the present invention.

[Brief explanation of the drawing]

FIG. 1 illustrates the main parts and related parts in an embodiment of the multi-frequency dial signal selective transmission system of the present invention. In the figure, 1 is a telephone line, 2 is a handset, 3 is a telephone communication network, 4 is a multi-frequency oscillator, 5 is a dial switch,
6 is a diode rectifier circuit, 7 is a numeric storage unit, 8 is a destination subscriber selection button switch, 9 is a main control circuit, 10 is a random access memory circuit, 11 is a latch circuit, 12 is a drive circuit, 13 is a photocoupler switch circuit network , 14 is a relay drive circuit.

Claims (1)

[Claims] 1. A multi-frequency oscillator capable of simultaneously generating one frequency each from among m low group frequencies and n high group frequencies using direct current from a telephone line as a power source, and a push button type oscillator. In a telephone terminal device having a dial switch and a numeric storage section for storing number digits, between the multi-frequency oscillator and the numeric storage section (
A photocoupler switch network consisting of (m+n) photocouplers is provided, and the light-emitting side elements of each of the (m+n) photocouplers are connected so as to receive a driving current from the numerical storage section, and the m photocouplers of the first group Any one of the light-receiving elements of the second group and any one of the light-receiving elements of the n photocouplers of the second group are connected to form a series conductive path, and one end of the conductive path is connected to the low group frequency of the multifrequency oscillator. By configuring the selection terminal so that the other end is connected to the high group frequency selection terminal of the multifrequency oscillator, the multifrequency oscillator can be A multi-frequency dial signal selective transmission method characterized by transmitting a multi-frequency dial signal from an oscillator. 2 m of the first group in the photocoupler switch network
The collectors of the light-receiving elements of the n photocouplers of the second group are connected together with the row lines of the dial switch to the low group selection terminal of the multifrequency oscillator, and the emitters of the light-receiving elements of the n photocouplers of the second group are connected together with the column line of the dial switch. By configuring the circuit to be connected to the high group selection terminal of the multi-frequency oscillator, selective oscillation control of the same multi-frequency oscillator can be performed from both the numerical storage section and the dial switch. A multi-frequency dial signal selective transmission system according to claim 1.