JPS583620B2 - Push-button/dial telephone - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a push-button dial telephone, and more specifically, a magnetic card or the like on which a required code such as the telephone number of the called party is written is inserted into a card reader and read. The present invention relates to a push-button dial telephone that is suitably used when automatically transmitting push-button signals based on a signal.

Telephone communication between two terminals using a telephone communication network begins by picking up the transmitter/receiver of the calling party's telephone and sending out a dialing signal.The exchange receives this and calls the called party, and the called party picks up the transmitter/receiver. By picking up the telephone line, the telephone line between the calling party and the receiving party is connected and a telephone conversation is possible.

During this process, two telephone lines are connected by the exchange between the two terminals.
The voltage polarity of the line is reversed as shown in FIG.

From the normal state in which the internal circuits of telephones 1 and 2 on the calling and receiving sides are both open (Fig. 1A), the telephone 1 on the calling side
When you pick up the transmitter/receiver, the line goes off-hook (hook switch 7, which will be described later, closes) and the DC circuit is closed, so the exchange 3 starts up and sends a dial tone to the caller (
Figure 1 b).

Then, when the telephone 1 sends a dial signal, the exchange 3 starts the outgoing line selection operation (Fig. 1C), and when the called side is captured, the line voltage on the called side is reversed by the exchange 3, and A ringing signal is sent to the called party, and a ring tone is sent to the calling party from the exchange 3 (Fig. 1, 2).
.

After this, when the called party picks up the transmitter/receiver (off-hook) and answers, the internal DC circuit of telephone 2 is also closed, so both the ringing signal and the ringing tone stop, and the line polarity of the called party remains unchanged. Then, the line voltage on the transmitting side is reversed, and a mutual communication is possible (FIG. 1(e)).

On the other hand, as is well known, the main functions of a telephone as a terminal device are electroacoustic exchange for transmitting voice and transmission and reception of signals for selecting and calling a partner.

As a typical example of a pushbutton-dial telephone,
In the figure, a circuit diagram of a 600p telephone is shown.

In this figure, the telephone has a transmitter 4 and a receiver 5 that perform an electroacoustic conversion function, an oscillation circuit 6 that performs a transmitting and receiving function, a hook switch 7, and a bell 8 as main components, and further includes the above-mentioned components. Four diodes 91, 92, 93, 94 that always supply an operating voltage of constant polarity to the oscillation circuit 6 even if there is a polarity reversal in the telephone line.
A diode bridge full-wave rectifier circuit 9 consisting of a diode bridge full-wave rectifier circuit 9, a side sound prevention circuit consisting of a side sound suppression coil (induction coil) 10 and a balance circuit 11, a click absorption varistor 12, a howling prevention attenuation circuit 13, and a hook switch 7. Spark extinguishing circuit 14 and DC cutoff capacitors 15, 16, 17
etc.

The oscillation circuit 6 includes a transistor 21 and a low group coil 22L.
and a low group tuning circuit consisting of a capacitor 23L, a high group tuning circuit consisting of a high group coil 22H and a capacitor 23H, and diodes 41 and 4 for opening both ends of these tuning circuits.
2, 43, low and high group positive feedback coils 24L, 25L,
24H, 25H, diode 44 for bias current adjustment
, 45, a resistor 46, a capacitor 28 for preventing abnormal oscillation due to noise, and varistors 27L, 27H for limiting amplitude.

Each tuning circuit is provided with four sets of low group contacts 31, 32, 33, 34 corresponding to the rows of the 12 push buttons, and high group contacts 35, 36, 37 corresponding to the columns. ing.

Additionally, a common contact 30 is provided which operates no matter which of the push buttons is pressed.

To start a call, when you pick up the transmitter/receiver, the hook switch 7 closes and the direct current from the telephone line passes through the diode 94, the break side b of the common contact 30, the diodes 42 and 43, and the transmitter 4. It flows.

Next, push button signal (hereinafter referred to as PB signal)
When one of the pushbuttons on the telephone is pressed in order to send out a When the push button is further displaced by approximately 1.7 (mm), the make side a of the common contact 30 closes, and when the push button is displaced by approximately 1.9 (mm), its break side b opens, and the displacement is approximately 2.7 (mm). The push button hits the board.

Any one of low and high group contacts 31-34, 35-37
When each of them closes, a low and high group tuning circuit is formed, and then when the make side a of the common contact 30 closes, the transistor 21
When the break side b is further opened, the direct current to the coils 22L and 22H of both tuned circuits is cut off, and the Q value becomes large.
A B signal is sent out.

This PB signal continues until the push button is released and break side b is closed.

The handset 4 is disconnected from the telephone line only while the break side b of the common contact 30 is open.

Table 1 shows the pushbuttons and their corresponding combinations of PB signals consisting of two frequencies.

Note that function pushbuttons (*) and (#) are used for various services; currently, red (*) buttons are used for speed dial services, and blue buttons (#) are used for telephone calculation services. There is.

As indicated above, in current pushbutton dial telephones, the transmitter 4 is connected to the break side b of the common contact 30.
It can only be disconnected from the track when it opens.

Therefore, during the PB signal sending operation, there is a risk that noise due to external noise may be sent to the telephone line via the transmitter 4.

This causes a malfunction of the PB receiver installed on the exchange 3 side, which receives the PB signal and converts it into a DC code.

However, at present, push-button dial telephones are only used as an alternative to rotary dial telephones, so even if the above-mentioned noise causes the switching equipment 3 to select an incorrect outgoing line, it is not a serious problem. In many cases, this will not be the case.

However, push-button dial telephones have great potential to be applied not only to voice calls, but also to various services in the future, as they are currently being applied to telephone calculation services. Changes are also expected.

For example, it is possible that telephone lines will continue to be used as communication lines between computers and terminal equipment installed in data centers that will be opened in the near future, and that push-button dial telephones will be used as terminal equipment. Conceivable.

In this case, it will be necessary to use a magnetic card reader to read the ID code written on the magnetic card, exchange this ID code with a PB signal, and then send it to a data center for ID verification.

Also, assuming a cashless public phone,
If a magnetic card with an ID code written on it is inserted instead of inserting coins, it may be necessary to send the ID code converted to a PB signal to the station for ID verification.

Furthermore, the phone number of the called party can be encoded and written on a magnetic card, etc., and instead of pressing a push button, the phone number can be encoded and written on a magnetic card.
A method of inserting it into a reader, converting the read signal into a PB signal and sending it to the exchange 3 will also be realized in the near future.

In such a wide range of applications of push-button dial telephones expected in the future, noise is transmitted through the transmitter 4 during the operation of transmitting ID codes etc. converted to PB signals. If an error occurs while demodulating the signal, the purpose is not achieved and a great deal of confusion occurs.

Also, if we are to discover false signals and take countermeasures in advance,
The entire system becomes extremely complex.

Therefore, in order to effectively eliminate the noise input through the transmitter when transmitting a PB signal from the telephone or during data conversations with the data center, a device is used to disconnect the transmitter from the telephone line in advance. It is hoped that this will be realized.

On the other hand, in a conventional telephone as shown in Fig. 2, each of the low and high group contacts 31-34, 35-37 is closed by a manual suppression operation, so the ID code written on the magnetic card, etc. In the case where the PB signal is read by a card reader and the PB signal is automatically transmitted based on this signal, it is impossible to apply the above-mentioned telephone as is.

In view of the wide range of applications expected in the future for push-button dial telephones, this invention makes it possible to automatically transmit a PB signal, and also makes it possible to disconnect the transmitter from the telephone line when transmitting a PB signal. The present invention provides an improved push-button/dial telephone.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention and a procedure for using a push-button dial telephone in this embodiment will be described in detail.

In addition, in FIG. 3, elements or circuits that are the same as those shown in FIG. 2 are given the same reference numerals and their explanations are omitted, and the numbers of elements that are not necessary for the explanation of this invention are omitted. Avoid clutter.

In FIG. 3, diodes 91 and 92 are used as diodes on two adjacent sides of a diode bridge full-wave rectifier circuit 9, which is provided in the circuit of a push-button dial telephone to cope with reversal of the polarity of the telephone line. (See FIG. 2) In place of the light emitting diode 53 of the photo couplers 51 and
, 55 are connected to each other.

Photocouplers 51 and 52 connect these light emitting diodes 53 and 55 and phototransistors 54 and 56, respectively.
It is composed of.

When the sender/receiver of the telephone 1 on the calling side is picked up, it goes off-hook, so the DC circuit within the telephone 1 is closed, and current flows through the light emitting diode 53 in FIG. 16, causing it to emit light.

When the telephone 2 of the called party goes off-hook after calling the calling party, the polarity of the telephone line of the calling party is reversed (FIG. 1(e)).

Therefore, the current to the diode 53 is stopped, current flows to the light emitting diode 55, and the diode 55 emits light.

After the call ends, hang up the transmitter/receiver of the calling party's telephone 1.
Since the telephone is on-hook and the DC circuit inside the telephone 1 is opened, the power to the light emitting diode 55 is stopped.

Power to the light emitting diode 53 remains stopped.

In this way, by connecting the photocouplers 51 and 52 to the rectifier circuit 9, it is possible to detect that the telephone 1 on the calling side has transitioned to the off-hook and on-hook states, respectively, and that the called side has responded and is ready to talk. It is detected that a condition has occurred, ie, that the polarity of the telephone line has been reversed.

These detection signals are transmitted through phototransistors 54 and 56.
can be taken out from output terminals P2 and P8, respectively, and the above state change is displayed by the light emission from each light emitting diode 53 and 550.

Light emitting diode 53 in photo couplers 51 and 52
, 55 and the phototransistors 54 and 56 are electrically insulated from each other, so that the telephone line and a control device, which will be described later, do not affect each other, and malfunctions are greatly prevented.

Furthermore, in FIG. 3, a transmitter cutoff/automatic dialing contact 70 is connected in parallel with the common contact 30.

The contact 70 is normally connected to the a side, and the transmitter 4 is connected to the telephone line.

Also, at this time, the low and high group contacts 31 to 34, 35 to 3
It is possible to send a PB signal by manually pressing a push button using 7.

When the contact 70 is switched to the b side, a DC voltage is applied to the oscillation circuit 6 regardless of whether the common contact 30 is open or closed, and the transmitter 4 is disconnected from the telephone line.

In addition, the low and high group tuning circuits of the oscillation circuit 6 include automatic dialing low and high group contacts 71 to 74, in parallel with the low and high group contacts 31 to 34 and 35 to 37 corresponding to the push buttons, respectively.
75 to 77 are connected.

Based on the detection signals from the photocouplers 51 and 52, the contact 70 is switched to the b side for a required period of time, the transmitter 4 is disconnected from the telephone line, and an operating voltage is applied to the oscillation circuit 6. The transmitter disconnection and oscillation control device enables oscillation, and the code written on the magnetic card 80 is read, and after the contact 70 is switched to the b side, the low,
FIG. 4 shows an automatic dialing device that automatically sends out a PB signal by closing any one of the high group contacts 71-74 and 75-77.

The automatic dialing device consists of a magnetic card reader 81, a decoder 82, a data processing circuit 83, and an interface 84 for low and high group contacts.

The magnetic card 80 has an ID number or the telephone number of the called party (dial/l6) encoded and written in the center, and an STX (start of text) before and after it.
, and ETX (end of text), LRC (
Control codes such as horizontal redundancy check) are written.

The card reader 81 amplifies the signal read by the magnetic head 87 for reading the data on the card 80 and sends it to the decoder 82 .

Photo sensor 88 outputs a scanning signal CS while card 80 is being transported.

This scanning signal CS is sent to the decoder 82, and is also sent to the transmitter intermittent and oscillation control circuit 63, which moves backward, as a trigger signal for transmitter cutoff and automatic dialing.

The decoder 82 decodes the signal sent from the magnetic head 87 while the scanning signal CS is being input into a switching signal, and converts this into a card data signal CD.
It is sent to the data processing circuit 83 as a.

The processing circuit 83 performs serial/parallel conversion on the signal CD and decodes it in decimal evolution, and the interface 84 for low and high group contacts decodes the low and high group contacts 71 based on the signal corresponding to the numerical value of each pushbutton. One contact is selected from each of ~74, 75~77, and the relay of the contact is driven after a certain period of time has elapsed.

The transmitter disconnection and oscillation control device includes an off-hook detection circuit 61, a polarity reversal detection circuit 62, a transmitter disconnection and oscillation control circuit 63, and a transmitter disconnection and oscillation control interface 64. - Based on the signals from the photo couplers 51 and 52, the hook detection circuit 61 detects that the transmitter/receiver of the telephone is picked up and the hook switch 7 is closed, and outputs an "L" level off-hook state. Outputs detection signal F.

This circuit 61 is constituted by an AND circuit in this embodiment.

Referring to FIG. 5, in a normal state where the transmitter and receiver of the telephone are placed, the hook switch 7 is open, no current flows through the light emitting diodes 53 and 550, and the photo couplers 51 and 52 Since the output terminals P2 and P8 are at "H" level, the off-hook detection signal F is also "H".
level.

When the transmitter/receiver is picked up (off-hook), the hook switch 7 is closed, current flows through the light emitting diode 53, and the level of the terminal P2 of the photocoupler 51 is reversed to "L", so the detection signal F is also It is also inverted to "L".

When the called side responds (called side goes off-hook) and the telephone line of the calling side is reversed, the output of the photo coupler 51 becomes "H" and the output of the photo coupler 52 becomes "L".
Detection signal F is still at "L" level.

After using the telephone, when you hang up the transmitter/receiver (on-hook), the outputs of photo couplers 51 and 52 both become “H”.
”, the off-hook detection signal F also becomes “H”.

When in the off-hook state, the telephone is in some use state, and at this time the off-hook detection signal F is "L".

The polarity reversal detection circuit 62 detects, based on the signals from the photocouplers 51 and 52 and the off-hook detection signal F, that the telephone line is off-hook and the polarity of the telephone line on the calling side has been reversed. At times, a polarity inversion detection signal S of "L" level is output.

Since the polarity of the telephone line is not reversed even if the telephone line goes off-hook from a normal state, the reversal detection signal S is still at the "H" level.

When the called party answers and the polarity of the telephone line is reversed, the signal S
is also inverted to "L".

When you finish using your phone and it goes on hook, it goes off
Since the hook detection signal F is inverted to "H", the inversion detection signal S also becomes "H".

When the polarity inversion signal S is at the "L" level, a telephone call or data conversation is possible.

The transmitter intermittent and oscillation control circuit 63 uses the off-hook detection signal F, the polarity reversal detection signal S, and the transmitter cutoff and automatic dialing trigger signal CS from the photo sensor 88 to control the transmitter 4. determines the period during which the oscillation circuit 6 should be switched to an oscillation enabled state while disconnecting the oscillator 6 from the telephone line;
It outputs a control signal TX, and can be constructed from a simple logic circuit.

As can be seen from the time chart shown in FIG. 5 and the operation description described later, this circuit 63 detects the photo sensor 8 when the off-hook detection signal F is at the "L" level.
When the trigger signal CS is sent from 8, the control signal TX is set to “L”.
When the polarity inversion detection signal S is inverted after the signal TX is inverted to the "L" level, the control signal TX is returned to the "H" level.

The interface 64 also switches the contact 70 to the b side based on the control signal TX only during the period when the signal TX is at the "L" level.

After the telephone is taken off-hook, a magnetic card 80 with the called party's telephone number coded on it is inserted into the card.
When inserted into the reader 81, a scanning signal CS is output and the card 80 is read.

After reading the data, when the scanning signal CS returns to the "H" level, the control signal TX of the control circuit 63 is inverted to "L" at the time of this rise.

As a result, the contact point 70 is connected to b via the interface 64.
Since the transmitter 4 is switched to the side, the transmitter 4 is disconnected from the telephone line, and an operating voltage is applied to the oscillator circuit 6.

During this time, the data read by the magnetic head 87 is decoded by the decoder 82 as a code/data signal CD, and then sent to the processing circuit 83, where it is sent to the processing circuit 83.
The telephone number is converted into a decimal number and input into the interface 84.

Then, after a certain period of time has passed after the scanning signal CS is inverted to the "H" level, the automatic dialing contacts corresponding to the telephone numbers are closed in a certain order, and a PB signal consisting of two frequencies, low and high, is sent to the exchange. sent towards.

In the figure, a low group PB signal sending signal DL and a high group PB signal sending signal DH represent that low and high group signals are being sent, respectively, and a PB signal sending signal DS represents a PB signal consisting of two frequencies.
This indicates that a signal is being sent.

After sending the PB signal, when the called side (data center) is captured and goes off-hook, the polarity reversal detection signal S goes “L”.
Since the level is inverted, the control signal TX is “H” at this point.
”, the contact 70 returns to side a, and the transmitter 4 is connected to the telephone line again.

Since the transmitter 4 is connected to the telephone line, it becomes possible to talk to the called party.

If you need to send the ID code to the data center in advance for data conversation after a call, insert the magnetic card 80 with the ID code written on it, and the scanning signal CS will similarly go to "L" level. During this time, the data on the card 80 is read out.

Then, when the scanning signal CS is inverted to the "H" level, the control signal TX is again inverted to the "L" level.

Then, due to this "L" level signal TX, contact 7
0 is switched to the b side, the transmitter 4 is disconnected from the telephone line and the oscillation circuit 6 becomes ready for oscillation.

After a certain period of time has elapsed, the ID code is converted into a PB signal and sent to the data center.

Then, as will be described later, once the ID code has been verified, it becomes possible to send data such as commands using the push button.

After the data conversation ends, when the transmitter/receiver is put down and the handset goes on-hook, the polarity reversal detection signal S is inverted from the "L" level to the "H" level. Returns to H” level, resulting in contact 70
returns to side a and becomes the same state as the initial normal state.

In addition, in normal calls that do not involve data conversation,
As soon as the call ends, the handset is hung up and turned on.
However, since the control signal TX is at the "H" level when the call is on, the contact 70 remains connected to the a side even if it becomes on-hook and the reversal detection signal S is reversed. , the handset 4 remains connected to the line.

In addition, if it is necessary to return to a state in which communication is possible after the data conversation ends, a trigger generation switch or the like to return to the communication state may be provided, or a manual switch 65 (described later) may be provided.
It is also possible to easily configure the control circuit 63 so that the control signal TX is inverted to "H" level by the trigger signal TS from.

As described above, the oscillation circuit 6 is provided with a contact 70 for disconnecting the transmitter and automatically dialing the transmitter to select either the oscillating circuit 6 or the transmitter 4, and this contact 70 serves as the transmitter disconnector and oscillator. Since the control device switches to the B side only for the required period, the transmitter 4 is disconnected from the telephone line when sending a PB signal for calling the called party or during data conversation, and the noise is transmitted through the transmitter 4 to the PB signal. This prevents the situation in which the data is sent out at the same time.

Further, when a call is required, the transmitter 4 is connected to the telephone line, so that normal calls can be made without any problem.

Furthermore, when the phone goes on-hook, the contact 70 returns to the a side and the transmitter 4 is returned to the state connected to the telephone line, so if the commercial AC power supply fails and the control circuit etc. becomes inoperable. Even if this occurs, there will be no disruption to conventional telephone functions.

Also, low and high group contacts 31 to 34, 35 to 37 corresponding to push buttons provided in both low and high group tuning circuits of the oscillation circuit 6
Since low and high group contacts 71 to 74 and 75 to 77 for automatic dialing are connected in parallel to
It is possible to send signals.

In this embodiment, since the scanning signal CS of the card 80 is used as a trigger signal for transmitter cutoff and automatic dialing, the telephone user can disconnect the transmitter 4 from the telephone line without any manual operation. The oscillation circuit 6 can be disconnected and the oscillation circuit 6 can be put into an operable state.

Moreover, from the time of scanning the card 80, the transmitter 4
The card can be separated. At the time of automatic PB signal transmission operation performed after scanning, the transmitter 4 is already disconnected from the telephone line, and malfunctions due to noise can be reliably prevented.

This is particularly important in data conversations, allowing error-free data transmission.

Note that the contacts 70, 71 to 77 can be replaced with non-contact switching means such as semiconductor switching elements.

Further, in the above embodiment, the scanning signal CS is used as the trigger signal;
Instead of the trigger signal TS from the manual operation switch 65
It will be easily understood that it is also possible to use

The switch 65 is turned on momentarily after the telephone is off-hook and the tone from the exchange is confirmed, before or after the magnetic card 80 is inserted.

After the contact 70 is switched to the b side in response to the signal TS from the switch 65, one of the low and high group contacts 71 to 74 and 75 to 77 is sequentially closed by the automatic dialing device. It will be done.

The above-mentioned operations or operations in the case of a normal telephone call can be summarized as a series of flowcharts shown in FIG.

If you pick up the transmitter/receiver from the "normal state", you will be "off hook", and after "checking the dial tone" from the exchange, you can check whether the magnetic card 80 is dialing automatically or not.
In the case of automatic dialing, the magnetic card 80 is inserted into the card reader 81.

If automatic dialing is not used, a PB signal is sent to the exchange using a push button.

When the magnetic card 80 is inserted into the card reader 81,
Scanning signal CS by “card scanning”
Immediately, the contact 70 is switched to the b side, and the handset is "disconnected from the telephone line."

After that, the data processing circuit 83 checks whether there is an error in the format of the card data.
If there is no error, any one of the low and high group contacts 71 to 74 and 75 to 76 are sequentially closed via the interface 84 and the rPB signal is sent out.

If there is any of the above errors, an "error display" is made, and the insertion of the card 80 into the card reader 81 is repeated.

After sending the PB signal, if the called party is captured and the called party goes off-hook, the polarity of the telephone line is reversed, and the reversal detection signal S causes the gap contact 70 to return to the a side.
The handset is connected to the line and you are ready to make a call.

After the call ends, if you hang up the transmitter/receiver, it becomes "on hook" and the transmitter 4 remains connected to the line.
Return to "normal state".

The flow of operations or operations when connecting a telephone line to a data center and conducting a data conversation is shown in FIG.

In this figure, the "off-hook on the called side" in FIG. 6 becomes the "off-hook on the data center side", and the flow before that is the same as that shown in FIG. 6.

If "the data center side goes off-hook", "the polarity of the telephone line is reversed", so the reversal detection signal S causes the gap contact 70 to return to the a side, so that the transmitter 4 is connected to the telephone line. and becomes ready for "talk".

After the call, when the magnetic card 80 on which the ID code is written is inserted into the card reader 81, a scanning signal CS is output by "card scanning", and the contact 70 is immediately switched to the b side again. If the "talker is disconnected" and there is no error in the format of the card data, "the ID code is converted to a PB signal and sent to the data center."

After this, when you use the push button to "send a 4-digit code number," the rID verification is performed on the data center side.
If the ID code and PIN number match, there will be a response from the data center stating that it is OK to start a data conversation; if they do not match, the data center will send an on-hook message.
and ends.

After the data conversation start response is received, the data conversation begins.

For example, when a command signal is converted into a PB signal and sent using a push button, the data center sends guidance and other responses in response.

Various responses from the data center are sent by PB signals and are recorded on recording device 133 shown in FIG. 9 and/or displayed on display device 134, as described below.

Data transfer with the data center is repeated several times as necessary, and when the data conversation ends and you hang up the transmitter/receiver, it becomes "on hook", so contact 70 is on side A. The process returns to the "normal state" in which the transmitter 4 is connected to the telephone line.

The telephone shown in FIG. 3 and the device shown in FIG. 4 can also be applied to the case where the card 80 is inserted into the card reader 81 instead of inserting coins at a cashless public telephone.

At this time, an ID code has been written on the magnetic card 80.

The operation or operating procedure in this case is shown in the flowchart shown in Figure 8.
Represented by a chart.

If you pick up the transmitter/receiver from the "normal state" and go "off-hook" and immediately insert the card 80 into the card reader 81, "the transmitter is disconnected" in the same manner as above, and the "card data" is If there is no error in the format, the ID code is converted to a PB signal and sent to the station.

After this, if you use the push button to "send the recitation number",
On the station side, "ID verification" is performed, and if the ID number and PIN number match, the bureau will ``send a dial tone'', and if they do not match, [the dial tone will not be sent] and the PIN number will be sent again. Repeated operations are required.

When a dial tone is sent out from the station side, the station ``confirms the dial tone'' and then ``sends a PB signal using a push button.''

The subsequent flow is the same as that shown in FIG.

Note that instead of sending the PB signal using a push button,
It is also possible to insert the magnetic card 80 on which the called party's telephone number is written into the card reader 81 and perform the procedure shown in FIG.

In the telephone set shown in FIG. 3, a response sound search coil 100 is coupled to a sidetone suppression coil 10.

The signals induced in the coil 100 include a PB signal, a tone (400 Hz) from the exchanger, and an intermittent response tone from the data center that is different in frequency from the tone and is assumed to be intermittent. These signals are amplified and then extracted by a band pass filter 101.

The dial tone from the exchange and the intermittent response tone from the data center are further sent to a timer 102, and when both of the tones continue for a predetermined period of time (for example, 3 seconds), a response tone confirmation signal DT is output.

This response tone confirmation signal DT includes a dial tone confirmation signal DT1 from the exchange, which will be described later, and an intermittent response tone confirmation signal DT2 from the data center.

The specific configuration of the bandpass filter 101 and the circuits and devices added thereto are shown in FIG.

In this figure, a filter 101 has a voltage controlled oscillation circuit that has the same center oscillation frequency as the frequencies of the tone from the exchange and the intermittent response tone from the data center, as well as the low and high frequencies that make up the PB signal. PLL (phase locked loop) 111, 112, 121 ~
It consists of 127.

The tone from the exchange passes through PLL111 and is sent to timer 1.
02 and continues for a predetermined period of time, a beep confirmation signal DT will be emitted.
1 is output.

PLL1 that allows intermittent response tones to pass from the data center
12 is provided with a fixed period intermittent detection circuit 103 that determines whether or not this intermittent response sound is intermittent at a predetermined cycle and confirms that it is an intermittent response sound from the data center. It is preferable.

If it is confirmed that the response tone from the data center is intermittent at a predetermined period and continues for a predetermined period of time, an intermittent response tone confirmation signal DT2 is output.

The outputs of PLLs 121 to 127 are sent to the hexadecimal decoding circuit 13.
1, where the PB signal consisting of two frequencies, low and high, is decoded into signals representing numeric buttons and function buttons based on the combinations shown in Table 1.

This decimal encoded signal is stored in a memory 132, and is recorded on a magnetic card or the like by a recording device 133, or displayed on a multi-digit display device 134, if necessary.

These devices 133 and 134 use push buttons to send data to the data center.
It is suitably used when confirming by displaying the B signal, or when displaying or recording the content of data conversation including guidance and responses sent from the data center.

The above response tone confirmation signal DT can be used in place of the scanning signal CS from the photo sensor 88 of the card reader 81 in the apparatus shown in FIG.

A time chart for disconnecting the telephone line from the telephone line using the response tone confirmation signal DT is shown in FIG.

When you pick up the transmitter/receiver and go off-hook, a dial tone is sent from the exchange, so a dial tone confirmation signal DT1 is output after a predetermined time (3 seconds) has elapsed since the off-hook, and the falling edge of this signal DT1 , the contact 70 is b
When the telephone line is switched to the side, the handset 4 is disconnected from the telephone line.

If the card 80 is inserted into the card reader 81 after off-hook, the contact 70 is switched to the b side and the transmitting circuit 6
After the oscillator is ready to oscillate and the handset 4 is disconnected from the telephone line, the interface 84 outputs a low,
Any one of the high group contacts 71 to 74 and 75 to 77 is sequentially closed, and the PB signal is sent out.

When the receiving side (data center) goes off-hook, the polarity of the calling side's telephone line is reversed, so the reversal detection signal S is reversed to "L", the contact 70 returns to the a side, and the transmitter 4 is connected to the telephone line and ready to make calls.

When conducting a data conversation, an intermittent response tone is sent out from the data center, so if the response tone continues for a predetermined period of time, an intermittent response confirmation signal DT2 is output, and the transmitter 4 is disconnected from the telephone line again. It will be done.

Then, with the transmitter 4 disconnected from the telephone line, transmission of the ID code and other necessary data by automatic dialing and response are performed.

When the data conversation ends and the transmitter/receiver is hung up, the contact 70 returns to the a side with the on-hook state, and the transmitter 4 is connected to the telephone line again, returning to the normal state.

FIG. 11 shows a series of the above operations or operations.

After going ``off-hook'' from the ``normal state'', if the continuation of the tone from the exchange is confirmed, a ``tone confirmation signal is output'' and the ``talker is disconnected'' automatically.

Then, when the automatic dialing sends out a PB signal and the called party goes off-hook, the polarity of the telephone line is reversed, and this reversed signal causes the handset to connect to the line. "Connected" and ready for "calling".

During a data conversation, an intermittent response tone is sent from the data center, and when this continues for a predetermined period of time, a ``data center response tone confirmation signal'' is output, and the ``talker is disconnected'' automatically again.

After the "data conversation" ends, you can hang up the transmitter/receiver and
"on hook" and returns to "normal state".

In this embodiment, a sidetone suppression coil 10 in the telephone
Among the signals extracted by the response sound search coil 100 coupled to the response sound search coil 100, only the response sound from the exchange or data center is detected by the band pass filter 101, and this detection signal is used as a trigger signal. It becomes possible to automatically disconnect the transmitter 4 by the response tone before the signal CS is output.

Furthermore, since the search coil 100 is insulated from the telephone line in direct current, it will not cause any trouble to the telephone line, and even if the commercial AC power supply fails, the telephone function will not be disturbed.

Since the continuation of the response sound is confirmed by the timer 102, the operation is extremely reliable.

As described above in detail, the pushbutton/dial telephone according to the present invention has a plurality of contacts connected in parallel to a plurality of contacts provided in a tuning circuit of an oscillation circuit corresponding to a plurality of pushbuttons. Provided with switching means for automatic dialing.

Since this switching means can be controlled by the electrical control means, it is possible to automatically send out the PB signal without manually suppressing the push button.

Further, the push-button/dial type telephone according to the present invention switches the direct current from the telephone line to either the transmitter or the above-mentioned oscillation circuit, and the transmitter is normally in a state in which the transmitter side can be energized. switching means for disconnecting and automatically dialing the telephone; means for detecting the off-hook state of the telephone and the polarity reversal state of the telephone line and outputting a state detection signal; The apparatus includes means for outputting a trigger signal, and means for switching the transmitter cutoff and automatic dialing switching means to the oscillation circuit side only for a required period based on the state detection signal and the trigger signal.

Therefore, during the PB signal sending operation, the above-mentioned switching means for transmitter cutoff and automatic dialing can be switched to the oscillation circuit side by manual operation or automatically, and the transmitter is disconnected from the telephone line. This makes it possible to prevent any malfunctions caused by noise being transmitted to the telephone line via the transmitter.

This invention is particularly useful when a PB signal for calling the called party is automatically sent by inserting a magnetic card or the like on which the called party's telephone number is written into a card reader. I instead of
In the future, it will be possible to insert a magnetic card with a D code written on it, convert the ID code into a PB signal and send it to the central office, or use the PB signal to conduct a data conversation with a data center. It will fully demonstrate its power in the various ways in which push-button/dial telephones will be used.

[Brief explanation of drawings]

FIG. 1 is an operational diagram showing polarity reversal of a telephone line, FIG. 2 is a circuit diagram showing the internal circuit of a conventional push-button dial telephone, and FIGS. 3 to 11 show embodiments of the present invention.
Fig. 3 is a circuit diagram showing the internal circuit of the telephone, Fig. 4 is a block diagram showing the automatic dialing device and the transmitter disconnection/oscillation control device, and Fig. 5 is a time chart showing the operation of the device shown in Fig. 4. , Figure 6 is an operational flow chart for automatic dialing, Figure 7 is an operational flow chart for data conversation, Figure 8 is an operational flow chart for cashless public telephones, and Figure 9 is a band-pass filter. FIG. 10 is a time chart for performing a transmitter disconnection operation in response to a response tone confirmation signal, and FIG. 11 is an operational flow chart for the same operation. 1, 2...Push button/dial telephone, 4...
゜...Transmitter, 6...Oscillation circuit, 31-37
...Contact point corresponding to the push button, 61...
- Off-hook detection circuit, 62...Polarity reversal detection circuit, 63...Telephone intermittent and oscillation control circuit,
65...゛...Manual operation switch, 70...
Contacts for transmitter cutoff and automatic dialing, 71 to 77...
...Automatic dial contact, 81...Card reader, 100...Response sound search coil, 101
...bandpass filter.

Claims (1)

[Scope of Claims] 1. A plurality of switching means for automatic dialing connected in parallel to a plurality of contacts provided in a tuning circuit of an oscillation circuit corresponding to a plurality of pushbuttons, and a direct current from a telephone line being sent. A switching means for cutoff and automatic dialing that switches to either the handset or the above-mentioned oscillation circuit and is normally in a state where the handset side can be energized; A means for detecting a polarity reversal state and outputting a state detection signal, a means for determining the timing at which the handset should be disconnected from the telephone line and outputting a trigger signal, and a means for outputting a trigger signal based on the above state detection signal and trigger signal. A push-button dial telephone set comprising means for switching the above-mentioned transmitter cutoff and automatic dialing switching means to the oscillation circuit side only for time. 2. The push-button dial telephone according to claim 1, wherein the trigger signal is output by a manually operated switch. 3. The push-button dial telephone according to claim 1, wherein the trigger signal is a scanning signal of a card written with required data. 4. The push-button dial telephone according to claim 1, wherein the trigger signal is output based on a response signal from a central processing unit connected to a telephone line. 5. A push-button dial telephone according to claim 4, wherein the response signal is retrieved via a search coil coupled to a sidetone suppression coil connected to an internal circuit of the telephone. 6. After the automatic dialing switching means is controlled on and off based on the reading signal of the card in which the required data is written, and the transmitter cutoff/automatic dialing switching means is switched to the oscillation circuit side. ,
2. The push-button dial telephone according to claim 1, wherein on/off control of said automatic dialing switching means is initiated.