JPH06217361A - Key telephone set - Google Patents

Abstract

PURPOSE:To make dialing without a sense of incongruity in the dialing by an extension telephone set by preventing a bypassed PB signal from an external line accommodation section to an extension accommodation section. CONSTITUTION:A PB signal sent from an extension telephone set 2 is inputted to a transmission line of an extension accommodation section 6. The PB signal B is detected by a receiver 11 and a control section 70 makes a PB transmission request to an oscillator 9 based on the PB signal. The oscillator 9 sends the PB signal to a transmission line A of an external line accommodation section 4 based on a command from a control section 70. On the other hand, a channel connection control means 71 of the control section 70 gives a command of interrupting a reception path to an exchange switch 5a connecting/disconnecting the transmission reception path between the external lien accommodation section 4 and the extension accommodation section 6 while the oscillator 9 sends the PB signal to the transmission path A of the external line accommodation section 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key telephone system, and more particularly to a control system of a speech circuit when a PB signal is transmitted from an extension telephone.

[0002]

2. Description of the Related Art A button telephone apparatus is used which accommodates a plurality of extension telephones and has various functions for connecting these extension telephones to an external line of one line or a plurality of lines. Such a key telephone device uses, as its extension telephone, a two-wire analog telephone, an extension telephone dedicated to the key telephone device, or the like, and these extension telephones are connected to, for example, one of a plurality of outside lines. It has a function of connecting to a call path and displaying the usage status of a plurality of lines by the lighting state of the button corresponding to each outside line.

FIG. 2 shows the configuration of a system using such a conventional key telephone device. The system shown in FIG. 1 is a button telephone system of a system in which a push button dial signal (hereinafter referred to as a PB signal) transmitted from an extension telephone (extension terminal) is detected once and the PB signal is retransmitted from the inside of the apparatus to an outside line. Shows. In this way, the PB signal generated by the key telephone device, rather than the PB signal transmitted from the extension telephone, is transmitted to the outside line because the PB signal (or dial pulse signal) from the key telephone device is temporarily pressed. This is because the telephone device accepts the call and manages the call charge of the extension telephone based on these signals.

In the figure, reference numeral 1 denotes a key telephone device,
The extension telephone 2 is connected to the outside line 3 by the key telephone device 1. The button telephone device 1 is
It is provided with an outer line housing portion 4, an exchange switch portion 5, an extension wire housing portion 6, and a control portion 7. The extension telephone 2 is a two-wire standard analog telephone capable of transmitting a PB signal, and the extension 3
Is a two-wire analog telephone line. Button telephone device 1
The external line housing section 4 of the 2/4 conversion section 8 and the oscillator (PB
Oscillator 9). The 2/4 converter 8 converts the transmission / reception signal on the two-wire analog telephone line for the outside line 3 into the reception signal input from the outside line 3 which can be controlled by the exchange switch 5a and the transmission signal sent to the outside line 3. It is a 2-line / 4-line conversion unit for conversion, and the receiving path on the 4-line side is the receiving path A and the transmitting path is the transmitting path A. The oscillator 9 is an oscillator that sends a predetermined PB signal to the transmission path B according to an instruction from the control unit 7.

The exchange switch section 5 is composed of an exchange switch 5a and has a function of performing on / off control of a reception channel and a transmission channel in response to a control signal from the control section 7. The extension accommodation unit 6 is an analog extension accommodation unit including a 2/4 conversion unit 10 and a receiver (PB receiver) 11. The 2/4 conversion unit 10 is similar to the 2/4 conversion unit 8 of the outside line accommodation unit 4,
A two-line / four-line conversion unit, in which a transmission / reception signal in the same system as the two-line analog telephone line to the extension telephone 2 is input by the extension telephone 2 which can be controlled by the exchange switch 5a, and an extension It is for converting into a reception signal to be transmitted to the telephone set 2. Further, the reception channel between the exchange switch 5a and the 2/4 conversion unit 10 is referred to as the reception channel B, and the transmission channel is referred to as the transmission channel B. The receiver 11 has a function of receiving the PB signal of the extension telephone set 2 transmitted to the transmission path B via the 2/4 conversion unit 10 and transmitting it to the control unit 7 as a corresponding PB dial signal.

The control unit 7 inputs the activation signal information from the 2/4 conversion unit 10 and the PB dial signal information from the receiver 11, and requests the oscillator 9 for PB transmission and the 2/4 conversion unit 8. It has a function of performing various controls as the key telephone device 1, such as sending a start signal to the outside line 3 and sending a control signal to the exchange switch 5a.

Next, the operation of the system having the above configuration will be described. First, in order to make a call from the extension telephone 2 to the outside line 3, it is assumed that the handset of the extension telephone 2 is off-hook and a certain telephone number is dialed. That is, the extension telephone 2 closes the loop of the extension which is connected by the off-hook of the handset, and then the extension telephone 2 sends the PB signal B. Then, the 2/4 conversion unit 10 sends the start signal detection information to the control unit 7 by detecting the loop closure of the extension line. Further, the PB signal passes through the transmission path B from the 2/4 conversion unit 10 and is detected by the receiver 11. When the receiver 11 detects the PB signal, the receiver 11 converts and outputs the PB signal data, and the controller 7 reads the PB signal data.

When the control unit 7 receives the activation signal detection information from the 2/4 conversion unit 10 and the PB dial signal information from the receiver 11, it sends a activation signal transmission request to the 2/4 conversion unit 8. Also, the PB signal transmission request is transmitted to the oscillator 9 of the outside line accommodation unit 4. The 2/4 converter 8 that has received the activation signal transmission request closes the loop of the external line 3,
The oscillator 9, which has received the PB signal transmission request, receives the PB signal A
Is output to the transmission path A. Then, the PB signal A is transmitted from the transmission path A to the outside line 3 through the 2/4 conversion unit 8. At this time, the control unit 7 uses the exchange switch 5a to connect to the transmission path B so that the PB signal B from the extension telephone 2 does not pass directly from the transmission path B to the outside line 3 through the exchange switch 5a. Control is performed so as to disconnect the transmission path A.

On the other hand, the key telephone device 1 closes the loop of the outside line 3 so that the dial tone DT notifying that the outside line 3 can receive the PB signal can be received by the handset of the extension line telephone 2 and is also transmitted. Therefore, if the key telephone device 1 closes the loop of the outside line 3 and an incoming call is received at the same time, an audible sound from the outside line 3 can be recognized so that the collision state of responding to the incoming call can be recognized. In order for the extension telephone 2 to be able to confirm (for example, the call sound from the caller) and the like, the receiving path A and the receiving path B of the exchange switch 5a are connected.

FIG. 3 shows the above-mentioned outside line transmission sequence. That is, the extension accommodation unit 6 detects the activation signal by the activation signal (off-hook signal) from the extension telephone 2 and sends this detection information to the control unit 7. As a result, the control unit 7
Sends a start signal transmission request to the outside line accommodation unit 4 and sends a start signal to the outside line 3. That is, the loop of the outside line 3 is closed. In addition, the control unit 7 connects the above-mentioned receiving path, that is, connects the receiving path A and the receiving path B in the exchange switch unit 5. After that, dial tone (D
T) is transmitted to the extension telephone 2 via the key telephone device 1. In the figure, solid arrows show the flow of control signals, and white arrows show the flow of audio signals.

The caller who receives the outside dial tone on the extension telephone 2 side transmits a selection signal, for example, the telephone number of the called party. For example, if the telephone number is "123-5678", dialing the first number "1"
The PB signal B1 is input to the extension accommodation unit 6, and in the extension accommodation unit 6, the control unit 7 which converts the PB signal B1 into a PB dial signal and sends it to the control unit 7, based on the PB dial signal, A PB transmission request and a PB stop request after a predetermined time are issued to the outside line accommodation section 4, and the PB signal A1 corresponding to "1" is transmitted to the outside line 3 by this.
Similarly, when the next PB signal B2 ("2" in the case of the above telephone number) is transmitted from the extension telephone 2, the PB signal A2 corresponding to the PB signal B2 is transmitted to the outside line 3.

In this way, when the selection signal is sent to the outside line 3, the exchange (not shown) establishes a connection with the called party.
Then, when the connection to the called party is made, the exchange switches to the outside line 3
Side polarity reversal is performed, and this polarity reversal signal
Is input to the control unit 7. When the control unit 7 receives the polarity inversion signal, the control unit 7 determines that the call connection with the called party is established and connects the transmission path. That is, as described above, the transmission path A and the transmission path B are connected in the exchange switch section. By such an operation, the extension telephone 2 becomes in a callable state and a call is made with the called party.

[0013]

However, the above-mentioned conventional button telephone device has the following problems. That is, in the 2/4 converters 8 and 10 of the key telephone device 1, the analog signals (corresponding to the signals of the transmission path A or the reception path B in FIG. Due to impedance unmatching with the outside line 3 or the extension telephone set 2, a phenomenon called wraparound occurs in which the line is attenuated to a certain level and output to the four line side. For example, in the 2/4 converter 8, the signal from the transmission channel A is received by the reception channel A.
In addition, the 2/4 converter 10 outputs the signal of the receiving channel B to the transmitting channel B.

Therefore, the PB signal A generated by the oscillator 9 passes through the transmission path A and is sent to the outside line 3 through the 2/4 conversion section 8. However, the attenuated PB signal A is the reception path A. And go through the exchange switch 5a and the receiving channel B for 2/4
Input to the conversion unit 10. P input to the 2/4 conversion unit 10
The B signal A is sent to the extension telephone 2 through the 2/4 conversion unit 10, but the PB attenuated also in the 2/4 conversion unit 10.
The signal A wraps around the transmission path B and is input to the receiver 11. As a result, the receiver 11 also responds to the PB signal A due to this wraparound, whereby the control unit 7
Makes a PB transmission request to the oscillator 9, a plurality of PB signals A1, A2, ... Are transmitted from one PB signal B to the outside line 3.

Therefore, in order to avoid such a phenomenon, the receiver 11 must set the minimum detection level so as not to detect the PB signal A due to this wraparound. That is, it is necessary to lower the detection sensitivity of the receiver 11 and raise the minimum detection level to some extent. Further, if the minimum detection level is set too high, for example, when the line length between the extension telephone 2 and the key telephone device 1 is made very long, the signal level input from the extension telephone 2 to the key telephone device 1 is increased. When the PB signal is low, the PB signal cannot be detected, and therefore the upper limit value of the minimum detection level is naturally determined. Therefore, the setting margin of the minimum detection level of the PB signal in the extension accommodation unit 6 is extremely small. There was a problem that it was small.

Furthermore, as a selection signal for the extension telephone 2, PB
When the signal B is transmitted, a wraparound occurs at the 2/4 conversion unit (not shown) inside the analog telephone, and this is heard by the handset of the extension telephone 2. At the same time, the PB signal B transmitted from the extension telephone 2 is detected by the extension accommodation unit 6 and is transmitted from the oscillator 9 of the outer accommodation unit 4 to the outside line 3 as the PB signal A. Due to the wraparound phenomenon by 8, the PB signal A sneak in passes through the exchange switch 5a and the 2/4 conversion unit 10, is input to the extension telephone 2, and is heard by the handset.

As a result, the caller hears two identical dial sounds of the PB signal B of the extension telephone 2 itself operated by the caller and the PB signal A sent from the oscillator 9 of the key telephone apparatus 1. In some cases, the caller may feel uncomfortable or may be judged to be an erroneous operation, which is not satisfactory in use.

The present invention has been made in order to solve the above-mentioned conventional problems, and it is possible to lower the detection level of the PB signal input from the extension telephone and to perform a transmission operation without a feeling of discomfort from the extension telephone. An object is to provide a possible key telephone device.

[0019]

SUMMARY OF THE INVENTION A button telephone apparatus of the present invention is a button telephone apparatus which accommodates an extension telephone for transmitting a push button dial signal and connects the extension telephone to an outside line. Line accommodation section having a channel and a reception channel, a receiver for detecting a push button dial signal flowing on the transmission channel of the extension accommodation section, an external line accommodation section having a transmission channel and a reception channel to the outside line, and the receiver An oscillator for generating a push-button dial signal based on the push-button dial signal detected by the above, and transmitting it to the transmission path of the outside line accommodation section, the transmission / reception channel of the extension accommodation section and the transmission / reception channel of the outside line accommodation section. And a switching switch for connecting / disconnecting these transmission / reception channels and the switching switch while the oscillator is transmitting a push button dial signal. Relative pitch, is characterized in that it comprises a speech path connection control means for controlling so as to cut the receiver path.

[0020]

In the key telephone apparatus of the present invention, when a PB signal is transmitted from the extension telephone, the PB signal is input to the extension accommodation section of the key telephone apparatus. When a PB signal flows on the transmission path of the extension accommodation unit, the receiver detects it and sends it to the control unit as a PB dial signal. The control unit
A PB transmission request is issued to the oscillator based on the input PB signal, and the oscillator that has received this PB transmission request
A PB signal is generated and sent to the transmission path of the outside line accommodation section.
On the other hand, the communication path connection control means of the control unit is
While the B signal is being transmitted on the transmission path, the exchange switch is instructed to disconnect the reception path. As a result, it is possible to prevent the generated PB signal from wrapping around to the extension accommodating portion side while the oscillator is transmitting the PB signal.

[0021]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a key telephone device of the present invention. In the figure, reference numeral 100 indicates a key telephone device, and the extension telephone 2 is connected to the outside line 3 by the key telephone device 100, as in the conventional case. The button telephone device 100 includes an outside line accommodation unit 4, an exchange switch unit 5, an extension line accommodation unit 6, and a control unit 70. Since they are the same, the corresponding parts will be denoted by the same reference numerals and the description thereof will be omitted. Further, since the extension telephone 2 and the outside line 3 are also the same as the conventional ones, the description thereof will be omitted.

The control unit 70 inputs the start signal information from the 2/4 conversion unit 10 and the PB dial signal information from the receiver 11, and requests the oscillator 9 to send a PB signal or 2/4.
It has a function of performing various controls as the key telephone device 100, such as sending a start signal transmission request to the conversion unit 8 and transmitting a control signal to the exchange switch 5a.

The control unit 70 also includes a communication path connection control means 71. The communication path connection control means 71 is composed of a logic circuit, a program, etc.
While the signal is being sent, to the exchange switch 5a,
It has a function of instructing the extension telephone 2 to disconnect the communication path from the reception path A to the reception path B. That is, specifically, it has a timer function that uses the PB dial signal from the receiver 11 as the activation timing, and the P from the oscillator 9
During the time period including the B signal transmission time, the exchange switch 5a controls so as to disconnect the receiving path.

Next, a PB signal transmission system of the key telephone device by the above system will be described. FIG. 4 is a diagram showing the outside line transmission sequence. First, an activation signal is output from the extension telephone 2 to the extension accommodation unit 6 of the key telephone device 100. That is, the extension telephone 2 goes off-hook, and the loop of the extension telephone 2 is closed. As a result, the 2/4 conversion unit 10 of the extension housing unit 6 detects this activation signal and sends it to the control unit 70 as activation signal detection information.

Based on the activation signal detection information, the control unit 70 requests the 2/4 conversion unit 8 of the external line accommodation unit 4 to transmit the activation signal, and the 2/4 conversion unit 8 transmits the activation signal to the external line 3. To send, that is, the loop of the outside line 3 is closed. afterwards,
The control unit 70 instructs the exchange switch 5a to connect the reception channel A and the reception channel B, and the exchange switch 5a
According to this instruction, the receiving channel A and the receiving channel B are brought into the connected state (shown by step S1 in the figure). After that, the dial tone (DT) is transmitted from the outside line 3 to the extension telephone set 2 via the receiving path A and the receiving path B to which the dial tone (DT) is connected.

The caller who receives the outside dial tone on the extension telephone 2 side transmits a selection signal, for example, the telephone number of the called party. For example, the telephone number is "123" as in the conventional case.
If it is -5678 ", the first number" 1 "
When you dial, the PB signal B1 is
The control unit 70 receives this PB signal.
As a result, the communication path connection control means 71 of the control unit 70
The exchange switch 5a is instructed to disconnect the connection between the receiving channel A and the receiving channel B. Based on this instruction, the exchange switch 5a disconnects the communication path between the reception path A and the reception path B (step S2).

After disconnecting the receiving path by the exchange switch 5a,
As in the conventional case, the control unit 70 issues a PB transmission request and a PB stop request after a predetermined time to the outside line accommodation unit 4 based on the input PB dial signal, whereby the PB signal corresponding to "1" is issued. A1 is sent to the outside line 3.
After a predetermined time that has been determined in advance, the communication path connection control means 71 instructs the exchange switch 5a to connect the reception path A and the reception path B, and the exchange switch 5a connects the reception path according to this instruction (step S3). .

The receiving path disconnection time of the exchange switch 5a is as follows. That is, in the current public network, P
The sending time of the B signal is regulated to be 50 ms or more, and it is usually sufficient to consider it to be about 100 ms. For this reason, the time during which the receiving channel A and the receiving channel B are disconnected at the time of transmitting the PB signal is set to about 100 ms.
It has no effect on the function of listening to audible sound.

After that, as in the case of the PB signal B1, the next PB signal B2 ("2" in the case of the above telephone number)
Is transmitted from the extension telephone 2, the exchange switch 5a disconnects the receiving path by the control of the communication path connection control means 71 (step S4), and then the PB signal B
The PB signal A2 corresponding to 2 is sent to the outside line 3. Then, after a predetermined time, the exchange switch 5a connects the receiving path under the control of the communication path connection control means 71 (step S).
5).

In this way, when the selection signals B1, B2, ... Are sent to the outside line 3, the exchange (not shown) establishes a connection with the called party. When the connection to the called party is made, the exchange reverses the polarity of the outside line 3 side, and this polarity inversion signal is input from the outside line accommodation unit 4 to the control unit 70. Control unit 70
Upon receiving the polarity reversal signal, determines that the call connection with the called party has been made and connects the transmission path (step S
6). That is, as described above, the transmission path A and the transmission path B are connected by the exchange switch 5a. By such an operation, the extension telephone 2 becomes in a callable state and a call is made with the called party.

As described above, in the above-described embodiment, during the time when the PB signal is transmitted from the oscillator 9 of the outside line accommodation section 4 to the transmission channel A, the communication channel between the reception channel A and the reception channel B is disconnected. Therefore, even if the PB signal sent from the oscillator 9 sneaks into the receiving path A by the 2/4 converter 8,
This attenuated PB signal does not flow to the receiving path B.

Therefore, the receiver 11 of the extension housing portion 6 is
Since it is not necessary to consider the detection of the PB signal due to the wraparound, it is possible to set the reception sensitivity in consideration of only the output level of the extension telephone 2 and the line loss between the key telephone device 100 and the extension telephone 2. For example, since the minimum detection level of the receiver 11 can be set low, the line length between the key telephone device 100 and the extension telephone 2 can be extended. That is, if the line length between the key telephone device 100 and the extension telephone 2 is lengthened, the signal level input to the key telephone device 100 becomes low due to the line loss, and in the conventional case, the minimum detection level of the receiver 11 is low. Since the line length needs to be short because it cannot be set, such a problem is eliminated in the present embodiment.

Also, the caller using the extension telephone 2 can perform a calling operation without feeling uncomfortable because the PB signal A due to the wraparound is not heard at the time of calling the PB signal B.

In the above embodiment, the disconnection time between the reception path A and the reception path B by the communication path connection control means 71 is constituted by the timer, but the disconnection time is not limited to this, and the disconnection is not limited to this. The stop (reception channel connection) instruction may be performed based on the timing of the PB stop request to the oscillator 9.

[0035]

As described above, according to the key telephone apparatus of the present invention, the receiving path to the receiver and the extension telephone side is disconnected while the push button dial signal is being sent from the oscillator. Therefore, the generated push button dial signal does not go around to the extension telephone,
Therefore, it is possible to freely set the sensitivity of the receiver, which makes it possible to elongate the line length of the extension telephone, for example. Also, since the caller of the extension telephone is prevented from listening to the push button dial signal due to the wraparound, it is possible to perform a call operation without discomfort.

[Brief description of drawings]

FIG. 1 is a block diagram of a key telephone device of the present invention.

FIG. 2 is a block diagram of a conventional key telephone device.

FIG. 3 is a sequence chart of an outside line transmission operation in a conventional key telephone device.

FIG. 4 is a sequence chart of an outside line transmission operation in the key telephone device of the present invention.

[Explanation of symbols]

 2 Extension telephone 3 External line 4 External line accommodation section 5 Exchange switch section 6 Extension accommodation section 9 Oscillator 11 Receiver 71 Call path connection control means 100 Button telephone device

Claims (1)

[Claims] 1. A button telephone device for accommodating an extension telephone for transmitting a push button dial signal and connecting the extension telephone to an outside line, comprising: an extension accommodation portion having a transmission path and a reception path to the extension telephone; A receiver for detecting a push button dial signal flowing on the transmission path of the extension accommodation section, an outside line accommodation section having a transmission path and an reception path to the outside line, and a push button dial signal detected by the receiver An oscillator that generates a button dial signal and sends it to the transmission path of the outside line accommodation section, and is provided between the transmission / reception path of the extension accommodation section and the transmission / reception path of the outside line accommodation section. The exchange switch for connecting / disconnecting, and the reception path for the exchange switch are disconnected while the oscillator is transmitting a push button dial signal. A button telephone device characterized by comprising a communication path connection control means for controlling.