JPS5895453A - Selective transmisson system for multi-frequency dial signal - Google Patents

Abstract

PURPOSE:To transmit information keeping a number accumulating part for the automatic dial function insulated electrostatically from a multi-frequency oscillator, by providing a photocoupler switch network. CONSTITUTION:When the user of a telephone terminal equipment selects and depresses a button of the destination subscriber in destination subscriber selecting switches 8 after hearing the dial tone, a short-circuit path is formed between one row line and one column line of selecting switches, and a CPU 9 decodes the button position of the destination subscriber through this short- circuit path and reads out numbers of the telephone number stored in a pertinent address of an RAM 10. First, the first number is read out and is stored temporarily in a latch circuit 11. Stored information of the 7-bit code form passes through a driver 12 to flow a current to one light emitting element of the first group of photocouplers Kl1-Kl4 and one light emitting element of the second group of photocouplers Kh1-Kh3 of a photocoupler switch network 13. A control signal from the CPU 9 operates a relay C through a driver 14, and a DC from an office exchange is applied between terminals (a) and (b) through a line (q) and a contact (c), to oscillate a multifrequency oscillator 4.

Description

DETAILED DESCRIPTION OF THE INVENTION 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.US, #) on the front of the telephone housing, low group frequency oscillators can be generated. In section '111', a multi-frequency signal combining one AC signal and one high group frequency AC signal is sent to the telephone line.

Push-button dial telephones make dialing easier and faster than rotary dial telephones, but they also reduce the hassle of having to remember each destination's telephone number and the number of times the dial switch must be pressed. For the purpose of
It is desirable to be able to add automatic dialing functions called repertoire dialing, auto dialing, or one-touch dialing to button dial telephones.

There are many embodiments in which an automatic dialing function is added to a rotary dial telephone. Since a relay can generally be used to connect the telephone line and the telephone line, 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 preventing the numeric storage section from entering the numeric storage section. In the unlikely event of an accumulation failure, the effect on the telephone line can be avoided. However, the multi-frequency oscillator of a push-button dial telephone receives its power from the central office exchange through the telephone line.

The multi-frequency 11 oscillator must be DC coupled to the telephone line.

Furthermore, it is impossible to relay and transmit a multi-frequency oscillator using a relay. Therefore, it is necessary to provide a means by which the above-mentioned number storage section can 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 selection transmission/output type according to 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 telephone ear switch 4, and a multi-frequency oscillator 4, regardless of the polarity of the direct current supplied through the switch 6 + temporary telephone line. This is a diode rectifier circuit for supplying fixed current to the telephone, and these constitute an essential part of a push-button dial telephone.

When the handset 2 is picked up, hook switches H5 and H52 are closed, and direct current is supplied from the nine-office exchange to the transmitter T via the telephone network 3. In this case, a direct current is supplied from the communication network to T through line p, contact C and line q in the figure. However, when the button of the dial switch 5 is pressed, the common contact CK closes and the line p and line 9 are opened, cutting off the direct current to the transmitter T, creating a path for the line q-CK, and the direct current is connected to the terminal. From a-b, the voltage of the multi-frequency oscillator 4 is X! Supplied closed.

The multi-frequency oscillator has a low group selection terminal as shown in the figure.
,, L,, L.

and high group selection terminals H,, H2, H, and 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 as a combined output from terminals a and b to the telephone line via the communication network 3.

The second method is a known multi-frequency dial signal selection and transmission method, and in the latest push-button dial telephone scent devices, the multi-frequency oscillator is often constructed from a single semiconductor LSI.

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 the 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 use of the second set of contact matrices (in the illustration, the lower matrix of the dial switch 5) will be described later.

In FIG. 1, 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 several to several dozen 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 using a dedicated LSI. 1o is a random access storage circuit (hereinafter abbreviated as RA~1) that stores the position 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. Writing and reading of button position information and telephone number digits are performed under the control of the CPU. 11 is CP
(m+n) human latch circuit that temporarily stores the telephone number digits read from the RAM by U, one digit at a time;
12 is a drive circuit, and 13 is a Tokaburasu Inochi circuit.

A summary of the operation of FIG. 1 is given below.

Registration of the destination subscriber's telephone number is done in the same way.

First, when the telephone terminal user closes the registration switch MEK, the CPU selects the closed position of the seven points from both of the contact matrices of the second set of the destination subscriber selection switch 8 and the dial switch 5. You will be able to receive information. In this state, one button (for example B) in the destination subscriber selection switch 8 is pressed.

Using the dial switch 5, the destination subscriber's telephone number is input in the same manner as in the case of normal manual tire linking. At this time, the CPU decodes the closing state of the father point of the contact matrix of the second set of dial switch 5, and stores the position information of button B and the destination subscriber's telephone number as a pair in RAM 10. .

Next, after pressing button B2, the same operation as above is performed to store the position information of B2 and the destination subscriber's telephone number as a pair in RAM10. This operation is similarly performed for B3 and below.

This can be done up to the maximum capacity of the destination subscriber selection switch.

After completing the memory setting operation for F:, the telephone terminal user restores the registration switch MEK to enable automatic dialing at any time. To make a call using the automatic dialing function, proceed as follows.

The user of the telephone terminal device first picks up the handset 2.

Direct current is supplied from the central office exchange to the telephone network through the telephone line.

At the same time, a dial tone is heard from the receiver R (although not shown, in the case of the spill reception method, if the off-hook button is pressed without picking up the handset, the dial tone is heard from the speaker). After the telephone terminal user hears the dial tone, the user selects the destination subscriber.

Selecting and pressing the destination subscriber button in switch 8 creates a short circuit between one row line and one column line in the selection switch.

The CPU thereby decodes the destination subscriber's button position and reads out the telephone number digits stored at the corresponding address in the RAM.

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 is m-4 and the number of high group frequencies fi is 3, so that they are stored in a 7-bit code format of 1 out of 4 and 1 out of 3. The accumulated 7-hit code format information is sent to the drive circuit 1.
2 to the first group of four photocouplers (Kl, , Kl, , Kl, , Kl,
) 9, for example, K13, and a light-emitting side element of one of the three photocouplers (Kh, , Kh, , Kh3) of the second group 9, for example, Kh.

In this case, each light-receiving side element of the photocouplers Kl and Kh2 exhibits a conductive state, and the light-receiving side element -Kl of the terminal L3-Kl.
A low-resistance conductive path is formed between the light-receiving side element terminal H8 of .

The fact that such a conductive path can be formed by any combination of one light-receiving element in Kl, ~Kl, and one light-receiving element in Kh, ~Kh is the configuration of the photocoupler circuit network shown in Figure 9. It will be understood from the capacity.

On the other hand, a control signal from the CPU 9 is passed through the drive circuit 14.
Ji' make it 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 H. 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.
It is in milliseconds.

For the second and subsequent numbers, 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.

A composite alternating current of a predetermined combination of low group frequency alternating current and high group frequency alternating current is sent from terminals a-b through telephone network 3 to the telephone line.

In the multi-frequency dial signal selection transmission method of the present invention, as seen in the embodiment shown in FIG. The configuration is such that the emitter of the light-receiving side element of the second group of photocouplers is connected to the high group selection terminal of the multi-frequency oscillator along with the column line of the dial switch 5.

Therefore, for both manual dialing by pressing the button on the dial switch 5 and automatic dialing by pressing the destination button of the destination subscriber selection switch in the numeric storage section, the same multi-frequency oscillator 4 selectively sends out a multi-frequency dial signal. is possible.

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 M-type NCUs (abbreviation for automatic call/manual voice type network control equipment) that use multi-frequency dial signals as line selection signals.

In other words, the telephone number 1j digits instructed by the computer are sent to the internal terminals 1 out of 4 and xou of the AA type NCU.
After converting and accumulating 7 bits of information, a 10 to converter switch circuit network having the same configuration as the embodiment shown in FIG. It is possible to operate a frequency oscillator and send a multi-frequency dial message to the telephone line.

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 communication circuit network, 4 is a multi-frequency oscillator, 5 is a dial switch,
6 is a die first rectifier circuit, 7 is a numeric storage section, 8 is a destination shore selection IR button switch, 9 is a main control circuit 1.10
1 is a random access memory circuit, 11 is a latch circuit, and 12 is a latch circuit.
13 is a drive circuit, 13 is a photocoupler switch circuit network, 161
is the relay drive circuit.

Claims (2)

[Claims] (1) A multi-frequency oscillator that can simultaneously generate 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 dial switch. In the telephone terminal device having a number storage unit for storing numbers and numbers, (m+n)f! is provided between the multi-frequency optical oscillator and the number storage unit. A photocoupler switch network consisting of il photocouplers is provided, and the light emitting side elements of each of the (m+n) photocouplers are connected so as to apply a driving current from the numerical storage section, and the light receiving element of the m photocouplers of the first group is connected. An arbitrary one of the side elements and an arbitrary 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 selection terminal of the multifrequency oscillator. By configuring the other end to be connected to the high group frequency selection terminal of the multi-frequency oscillator, the numeric storage section is electrostatically isolated from the multi-frequency oscillator. A multi-frequency dial signal selective transmission method characterized by transmitting more multi-frequency dial signals. (2) The collectors of the light-receiving elements of the first group of mil photocouplers in the photocoupler switch network are connected together with the row lines of the dial switch to the low group selection terminal of the multifrequency oscillator, and By adopting a circuit configuration in which the emitter of the light-receiving side element is connected to the high-frequency selection 4N terminal of the multi-frequency oscillator together with the row line of the dial switch described above, the same multi-frequency signal is transmitted from both the numerical storage section and the dial switch. Patent 1 Desired Range No. 1 (1) which is characterized by enabling selective oscillation control of a lever oscillator
) The multi-frequency dial signal selection transmission method described in section 2.