JPH047950A - Pb signal transmission system - Google Patents

Abstract

PURPOSE:To minimize a pseudo PB signal inputted to a PB signal receiver by providing a switch closed/opened by a MODEM signal between a MODEM signal reception point on a repeater channel and a MODEM transmission point to an exchange. CONSTITUTION:The user operates a PB signal button 1c according to a command of a message from a guide message talkie device 6c in an automatic terminal equipment 6. The information of a button 1c is sent to a transmission channel as a MODEM signal to a transmission channel. In this case, a MODEM receiver 2c in a radio base controller 2 detects a synchronization code added to a head of a MODEM signal to open a channel switch 2e. Thus, only the synchronization code is inputted to an automatic terminal equipment and the succeeding MODEM signal is not leaked to the post stage. Thus, the time of the MODEM signal leaked to the opposite terminal equipment is minimized in the process of relay.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a PB signal transmission system in which PB signal information from a telephone set is transmitted to an exchange via a modem signal in a telephone network, and the PB signal information is transmitted from the exchange to a subsequent PB signal. [Prior Art] A base control device, which is usually installed at the place where the wireless telephone is used, is installed between a terminal such as a wireless telephone and a switch. Radio waves are used between the wireless telephone and the base control device, and cables are used between the base control device and the switch. Therefore, modem signals are often used as control signals between these devices, and operation information for the PB signal button provided on the wireless telephone is directly transferred to the PB double signal for reasons of miniaturization and economical reasons. A system is adopted in which the signal is not transmitted from the telephone, but is transferred via the modem signal to the exchange via the base control equipment, where the exchange converts the signal into a PB signal, and sends it to the subsequent device. The PB button on the wireless telephone is not only used when the user dials the telephone number of the other party to connect to, but also allows the user to make a reservation for a seat or receive a guidance message from the automatic terminal after the connection is completed and the automatic terminal is in a call state. PB according to
It is also used when pressing buttons to send desired information to the PB double signal automatic terminal. In the latter method of use, since the communication path between the wireless telephone and the automatic terminal is set up, the modem signal emitted by the wireless telephone or relay device will more or less be input to the PB receiver of the automatic terminal. . The frequency of the modem signal is single frequency, which is generally different from the PB double signal (2 frequency mixture), but since there is a 2-wire/4-wire conversion point on the communication path, the guidance message sent from the automatic terminal is reflected and mixed with the modem signal. There is a possibility that a pseudo PB multiplication signal will be generated, which may lead to malfunction of the automatic terminal or false information. Furthermore, modem signals emitted from wireless telephones and relay equipment are reflected at 2-wire and 4-wire conversion points on the communication path, so when a user holds the receiver to his ear and presses the PB button, he can hear unpleasant noise. There is a problem. Regarding the transmission and reception of signals between wireless telephones and exchanges, for example, the one described in Nikkei Comic Union magazine, April 27, 1987 issue, pages 31 to 34, and the one described in Japanese Patent Application Laid-open No. 1983 Examples include those described in Japanese Patent No.-287246. [Problems to be Solved by the Invention] An object of the present invention is to minimize the occurrence of audible noise due to the generation of a pseudo PB double signal inputted to the above-mentioned PB signal receiver and the modem signal reflected on the communication path. The objective is to provide technical means for [Means for Solving the Problem] In order to achieve the above object, claim 1 is characterized by the following means. A switch is installed in between to turn on/off the communication path in both directions, and the synchronization code is used to determine whether the signal from the terminal is a modem signal, and when it is detected to be a modem signal, the switch is turned off immediately. This prevents the modem signal from the terminal side after the synchronization code from flowing to the rear end, and also prevents the modem signal from being reflected from the rear end by turning off the above switch while the modem signal is being sent to the exchange side. Completely prevents incoming modem signals from flowing forward. Regarding claim 2, a switch is provided between the modem signal reception point from the terminal side and the PB signal transmission point on the communication path in the exchange interface device to turn on/off the communication path in both the transmission and reception directions or only in the transmission direction. It determines whether or not the signal is a modem signal using a synchronization code, and when it detects that it is a modem signal, it immediately turns off the switch to prevent the modem signal after the synchronization code from flowing to the downstream, and By turning off the above switch until the transmission of the modem signal to the rear end is completed, the modem signal will leak to the rear end even if a modem signal corresponding to the next digit comes from the front end while the PB signal is being sent. to prevent If the above switch is installed in both the transmitting and receiving directions, the user will not be able to hear the PB double signal telephone sidetone reflected from the downstream switching network, but if it is installed only in the transmitting direction, the PB It becomes possible for the user to hear this as a harmonic sidetone. As for claim 3, the same method can be achieved by determining the synchronization code in the same way as in the previous item with the interface device of the exchange, transmitting this to the common control device to control the communication path switching device, and switching the communication path switch at the same timing as in the previous item. It is effective. Means for realizing claim 4 will be explained below. Information sent and received by modem signals can be classified into three types: between a telephone and a relay device, between a relay device and an exchange, and between a telephone and an exchange.Information sent and received between a telephone and an exchange is divided into three types: between a telephone and a relay device, and between a telephone and an exchange. Even though there was no need to process the data, it was still transmitted link-by-link via a relay device in order to unify the transmission format. Focusing on the fact that PB signal information sent out during a call path belongs to this category, the system identifies cases in which the telephone set sends PB signal information during a call, and adds a synchronization code assigned to the modem receiver of the exchange only in this case. By sending the modem signal carrying the PB signal information, it is possible to directly send only the modem signal carrying the PB signal information to the exchange without intervening the processing of the relay device. Claim 5 expands the application of the method of claim 4 to all cases in which the PB signal is sent only during a call, and can be realized by simply removing the condition of whether or not the telephone is in a call state as part of the processing of the telephone. Become. [Function] According to the methods of claims 1 to 3, when the relay device and exchange interface device receive a modem signal from the preceding device, the modem signal leaked to the subsequent device can be suppressed to only a synchronization code of about 10 m5, so that automatic The probability that the PB receiver mixes it with the reflected signal of the guide message from the terminal, converts it into a PB multiplied signal, and erroneously detects it is extremely small. According to the first aspect of the present invention, since the modem signal reflected from the rear end is completely cut off, the telephone user does not hear unpleasant noise. In the systems of claims 1 to 3, the modem signal leaks to the rear at two places, the relay device and the interface device of the exchange, but by adopting the system of claims 4 or 5, the leakage of the modem signal is prevented from occurring at the interface device 1 of the exchange. Therefore, the probability of malfunction of the PB signal receiver can be further reduced. [Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1-2. FIG. 1 shows the device and circuit configuration of a first embodiment that realizes the PB signal transmission method of the present invention. - is a wireless telephone, 2 is a wireless base control device, and control signals and communication between both devices are shown. Signals are sent and received via radio waves. 4 is a switchboard, 41
is an interface device installed in the exchange, and is indicated by 1 (3).
It is connected to two radio base control devices via a pair of cables. 5 is a telephone switching network, and 6 is an automatic terminal. The modem signal is 1 between the radio telephone 1 and the radio base controller 2.
The opposite side and the one side between the radio base control device 2 and the interface device 4 are independent, and are assigned different synchronization codes. That is, the modem receiver 2c can respond only to the synchronization code sent by the modem transmitter 1d, and the modem receiver 41 can respond only to the synchronization code sent by the modem receiver 2d. FIG. 2 is a time chart showing the modem signal and PB double signal transmission state when the PB signal button 10 of the telephone is operated when the radio telephone fil- is connected to the automatic terminal 6 and is in the idle conversation state. When the user of the radio telephone 1 dials the telephone number given to the automatic terminal 6 and the connection is completed, a transmission/reception communication path is set as shown below. ]-) Transmission channel: Transmitter 1. a-Wireless transceiver 1e
- Antenna] f - Antenna 2a - Radio transceiver 2b - Communication path switch 2e - 2-wire 4-wire conversion circuit 2f - Cable 3
- 2-wire 4-wire conversion circuit 41a - Communication path switch 41c (-
Communication path equipment W in the converter 4 (not shown) - communication path within the telephone exchange network (including the 2-wire 4-wire conversion circuit 5a) - PB signal receiver 6b 2) Reception communication path 2 guidance message talker 6C - Communication path within the telephone exchange network (including the 2-wire/4-wire conversion circuit 5a) - Communication path equipment within the exchange 4 (not shown)

[Not 5) - Communication path switch 4 ], e - 2-wire 4-wire conversion circuit 41a - Gable 3 - 2-wire 4-wire conversion circuit 2f - Communication path switch 2c -
Radio transceiver 21-・antenna 2a-antenna i-f-
Wireless transmitter/receiver 1e-receiver]b This state L: Put the communication path switch 2e on the above route J-
, 41d and 41e are in the on state, and the user of the wireless telephone can receive a guidance message in the automatic terminal 6.
You can listen to messages from the telephone receiver 1b. The user follows the instructions in the message and inputs, for example, the train number to be reserved by operating the PB signal button ]C. Information on the pressed PB signal button 1c is sent to the modem transmitter 1d.
The signal is sent out as a modem signal to the above-mentioned transmission channel 7. At this time, the modem receiver 2c in the radio base control device 2 adds a synchronization code #A I+ to the beginning of the modem signal.
(Fig. 2) is detected and the communication path switch 2e is turned off. Only the synchronization need erA" is input to the automatic terminal, and the subsequent modem signals are bound to leak to the downstream. Radio base control equipment When 2 recognizes the PB signal code from the modem signal, it turns on the communication path switch 2e and transmits the PB signal code to the primary.
After editing the modem signal to send the B signal code to the exchange side and turning off the communication path switch 2e again, the modem signal is sent from the modem transmitter 2d to the communication path in the sending direction, and when the transmission is completed, the communication path switch is turned off. Turn on 2e. The transmitted modem signal is reflected by the 2-wire/4-wire conversion circuit 2f and returns to the receiving communication path, but since the communication path switch 2e is turned off, it does not return to the telephone 1, thereby preventing noise to the user. . The synchronization code ttB'' (FIG. 2) of the modem signal sent above is transmitted to the modem receiver 41b of the interface device 41.
is detected and the communication path switches 41d and 41e (or 41
d only) is turned off. With this control, the synchronization code JI
Only the B I+ reaches the automatic terminal 6, but the subsequent modem signals do not leak to subsequent stations. When the interface device 41 recognizes the PB signal code from the modem signal, the PB signal receiver 6b of the PB double signal automatic terminal 6 corresponding to the code is transmitted from the PB signal transmitter 41c.
Send it towards. When the transmission of this signal is completed, the communication path switches 41d and 41e (or only 41d) are turned on. FB signal 11p++ (
2) is reflected by the 2-wire/4-wire conversion circuit 58 in the subsequent telephone exchange network 5 and returns to the receiving communication path, but the communication path switch 41e prevents the signal from returning to the telephone set 1. If you want the user of the telephone 1 to actively hear the sidetone, you can either not turn off the channel switch 41e or not provide a switch. FIG. 3 shows the device and circuit configuration of a second embodiment that implements the method of the present invention, and elements 1 to 3 and 5.6 are the same as in FIG. 1, including the internal configuration. 4 is an exchange, 41 is an interface device provided in the exchange, and the internal configuration of 41 is shown in FIG.
1c and communication path switches 41d and 41e are removed. 42 is a communication path switching device that exchanges communication paths between various interface devices and signaling devices; 4-3 is a PB signal oscillator that is commonly used within the exchange; and 44 is a common control that commonly controls various devices within the exchange. It is a device. Note that the PB signal oscillator 43 is connected to a port of the communication path switching device 42 through a highway in which each signal frequency corresponding to the PB signal code is assigned to a time slot. In the embodiment shown in FIG. 3, only the inside of the exchange is implemented using a different method, and its time chart is the same as that shown in FIG. 2 for the first embodiment. The transmission pulse 42a set on switch 4 in Fig. 3 [7]
and reception path 42b correspond to communication path switches 41d and 41e in FIG. 1, respectively. Only the parts different from the first embodiment will be explained below. When the connection between the telephone set 1 and the automatic terminal 6 is completed, the communication path differs from the above only inside the exchange, and is as shown below. 1) Transmission communication path: 2-wire 4-wire conversion circuit 4 ], ]a me switch set path 42a 2) Reception communication path: path 42b set on the switch
2-wire 4-wire conversion circuit 41a The synchronization code "B" (FIG. 2) of the modem signal sent from the radio base control device 2 is detected by the modem receiver 41b of the interface device 41 and communicated to the common control device 44.
The communication path switching device is controlled to release the transmission paths 42a and 42b (or only 42a) set on the switch. Due to this control, only the synchronization code It B jl is set to automatic terminal 6.
However, subsequent modem signals do not leak to subsequent devices. When the interface device 41 recognizes the PB signal code from the modem signal, it transmits it to the common control device 44, controls the channel switching device 42, and creates a path 42c for connecting the corresponding PB double signal time slot to the subsequent channel. The settings are made and a signal is sent to the automatic terminal 6. When the sending of this signal is completed, the communication path switching device 42 is controlled again to set up paths 42a and 42b (or only 42a). By this control, the same effects as described in claims 1 and 2 can be obtained. Next, a third embodiment will be explained using the time charts of FIGS. 1 and 4. The configuration of the device and circuit of the third embodiment is the same as that of the first embodiment. This embodiment can be applied to any case of the second embodiment, and only the control method is changed. A time chart in this case is shown in FIG. Now, in FIG. 1 or 3, the connection between the telephone set 1 and the automatic terminal 2 has been completed, and a communication path has been set. Since this state, that is, the call state, is recognized within the wireless telephone 1, the modem receiver 41. b (corresponding to the second rs''B') and sends it on the transmission communication path.As a result, the modem signal cannot be detected by the modem receiver 2C of the radio base control device 2, and is directly transmitted to the interface device. The modem receiver 41b in the telephone 1 and the automatic terminal 6 detect the detection by the modem receiver 41b in the telephone 1 and the automatic terminal 6.
Although this explanation assumes that the communication path between the telephone set 1 and the interface devices 4 and 7 has been completed, the same control method can be used as long as communication between the telephone set 1 and the interface devices 4 and 7 is set up. That is,
This method can also be applied to the process in which a telephone user dials the telephone number of the other party. Further, the application of the method of the third embodiment is not limited to the call state, but can be extended to all cases where PB double signals are transmitted. [Effects of the Invention] As explained above, the present invention can minimize the time during which the modem signal emitted from the telephone is leaked to the other party's terminal during the relay process, and can also reduce the points where the signal leaks. The probability of malfunction of a PB receiver or false information can be extremely reduced, and furthermore, audible noise caused by reflection of a modem signal that occurs when a PB button is operated on a telephone can be eliminated.

[Brief explanation of drawings]

FIGS. 1 and 3 are configuration diagrams of a device and a circuit according to an embodiment of the present invention. FIGS. 2 and 4 show the signals in the embodiments of FIG. 1 and the second example: 3. Wireless telephone, 3. Cable, 5. Switching network. ...Radio base control equipment, ...Switchboard, ...Automatic terminal.

Claims (1)

[Scope of Claims] 1. A modem signal transmitted through a communication path is used as a control signal between a telephone terminal and an exchange, and a relay device is provided between the telephone terminal and the exchange for relaying the modem signal link-by-link; In a PB signal transmission method that transmits PB button information of a telephone terminal to an exchange using a modem signal, when a modem signal is sent from the telephone terminal during a call, the relay device transmits the synchronization code of the modem signal from the telephone terminal. From the time the modem signal is received until the end of receiving the modem signal, a switch installed between the modem signal reception point and the subsequent transmission point on the communication path within the relay device disconnects the communication path, and the relay device receives the modem signal from the telephone terminal. A PB signal sending method characterized in that the switch disconnects the communication path from the time the relay device recognizes that the information in the message is a PB signal code until the relay device finishes sending the modem signal to the downstream device. 2. In the PB signal transmission method according to claim 1, when the synchronization code of the modem signal sent from the preceding device to the exchange during a call is received by the interface device in the exchange, the modem signal is received on the communication path within the interface device. A switch installed between the point and the subsequent PB signal sending point cuts off both the transmitting and receiving directions or only the transmitting direction of the downstream communication path, reads the PB signal code from the modem signal, and transmits the PB signal code from the interface device to the downstream terminal. A PB signal transmission method characterized in that when the transmission of the PB signal is finished, the communication path that was cut off by the switch is connected. 3. In the PB signal transmission method according to claim 1, when the synchronization code of the modem signal sent from the preceding device to the exchange during the communication path is received by the interface device in the exchange, the communication path is exchanged from the common control device of the exchange. When the device is controlled to disconnect both the transmission and reception directions or only the transmission direction of the communication path between the interface device and the downstream interface device, and when the PB signal code is read from the content of the modem signal, the communication path is disconnected from the common control device. Controls either or both of the switching equipment and the PB signal sending device provided in common with the switching equipment to send the PB signal to the subsequent device, and after the transmission is completed, controls either or both of the channel switching device and the PB signal sending device. A PB characterized in that the transmission of the PB signal is stopped when the PB signal is transmitted, and the downstream interface device and the interface device are connected.
Signal transmission method. 4. In the PB control signal transmission method according to claim 1, the PB control signal is transmitted during a call based on information as to whether the telephone terminal is on the call path or not.
A PB signal transmission method characterized in that only when transmitting button operation information, a synchronization code of a modem signal is changed to a synchronization code used for a modem signal transmitted from the relay device to the exchange. 5. In the device configuration and PB signal sending method according to claim 1, a synchronization code of a modem signal is used in the modem signal sent from the relay device to the exchange only when the telephone terminal sends PB button operation information. This is a PB signal transmission method that is characterized by transmitting the synchronization code instead of the synchronization code.