JPS63982B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for transmitting and receiving digitized information between a switch and a line concentrator using a channel that transmits and receives control signals such as calling signals and selection signals in addition to a channel that transmits and receives voice signals. This invention relates to a method in which pushbutton information from a pushbutton switch is shared for sending selection signals and for end-to-end simple data transfer in a terminal device that transmits and receives data.

With the rapid development of digital technology, public communication networks are being digitized, and not only exchanges and relay transmission lines, but also subscriber lines and telephone terminals are being digitized. With current analog telephone interfaces, the control signals between the terminal and the network are based on a combination of intermittent DC loops and multi-frequency signals, which limits the signal types and speeds; however, with digital telephones, communication In addition to the voice channel for transmitting and receiving voice information, it is possible to provide an independent signal channel for transmitting and receiving control signals, and it is expected that this will make it possible to improve the sophistication of telephone services.

FIG. 1 shows an example of the format of a digital information channel connecting a digital telephone and an exchange. One frame consists of 10 bits, and this frame is repeated at 8KHz. F is a frame synchronization signal, and D0 to D7, S
It is there to identify bits. D0 to D7 are audio channels with a capacity of 64 kb/s. S is a signal channel with a capacity of 8 kb/s. Multiple S bits form a new frame structure, and signals necessary for control between the terminal and the network are transmitted and received in the form of code signals.

FIG. 2 shows the configuration of a portion related to the generation of transmission signals for push button signals and voice signals in a conventionally considered digital telephone terminal. 1 is a push button switch matrix, 2 is a code signal generation circuit, 3 is a transmitter, 4 is an amplifier, 5 is an encoder, and 6 is a frame assembly circuit.

The subscriber's voice becomes an analog signal at the transmitter (T) 3, is amplified by the amplifier 4, and then sent to the encoder 5.
It is converted to a 64kb/s PCM digital signal.
On the other hand, the code signal generation circuit 2 generates a digital code signal corresponding to the pressed switch of the pushbutton switch matrix 1. The PCM digital signal output from the encoder 5 and the digital code signal output from the code signal generation circuit 2 are assembled into a frame as shown in FIG. 1 by the frame assembly circuit 6 and output to the transmission signal line 7. .
In conventional PB telephones, the multi-frequency signal generated by the push button is used not only as a selection signal to specify the communication partner, but also as a data signal for seat reservations, simple calculation services, etc. during communication. Since the signal channel through which the code signal is sent from the digital telephone is terminated at the subscriber exchange, this signal is not transmitted to the other party. Therefore, the above-mentioned digital telephone currently has a problem in that the PB signal of the PB telephone cannot be used for various services that are used from one terminal to another or from one terminal to another.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of digital telephones or digital terminals, and to
The purpose of this invention is to provide a push-button information transmission method that allows users to receive services equivalent to those of PB telephones.

That is, the present invention includes a plurality of pushbutton switches that selectively issue pushbutton information, and means for generating a code signal to be sent to a signal channel based on the pushbutton information selected by the pushbutton switches. The above object is achieved by providing means for generating a multi-frequency signal corresponding to the above-mentioned pushbutton information, and means for transmitting this multi-frequency signal to an audio channel. Further, by providing a control means for stopping or canceling the stop of the sending of the code signal to the signal channel or the sending of the multi-frequency signal to the audio channel, the structure prevents the sending of unnecessary signals.

The present invention will be explained below by way of an example. Third
The figure shows an embodiment of a portion according to the present invention of a telephone terminal to which the present invention is applied. In the figure, 1 to 7
is almost the same as in Figure 2. 8 and 9 are gates; 10 is a multi-frequency signal generation circuit that generates a known multi-frequency signal corresponding to the pushbutton switch matrix; 11 and 12 are resistors; 13 receives a control signal coming from an exchange or a line concentrator; A control circuit for managing the communication phase, 14 and 15 are signal lines. Figure 4 shows the transition of phases managed by the control circuit 13. (X, Y) within the phase
indicate the states of the signal lines 14 and 15, respectively.

When the subscriber picks up the handset (goes off-hook), the phase changes from "idle" to "outgoing";
Since the signal line 14 becomes "0" and the signal line 15 becomes "1", the gate 8 is opened and the gate 9 is closed, the selection signal generated by pressing the push button switch is sent to the signal channel (S) through the code signal generation circuit 2. .
When the control circuit 13 receives a response signal sent from the exchange in response to a response from the corresponding receiving terminal or receiving center, the control circuit 13 changes the communication phase to "communication", and sets the signal line 14 to "1" and the signal line 15 to "0". Become. Therefore, the data signal of one terminal or one center of a terminal generated by pressing the pushbutton switch of the pushbutton switch matrix 1 becomes an analog multifrequency signal in the multifrequency signal generation circuit 10, and is transmitted to the transmitter 3 by the resistors 11 and 12. are mixed with the analog signals from amplifier 4,
It becomes a PCM signal via the encoder 5 and is sent to the audio channels (D0 to D7). Since a path is formed in the voice channel to the destination terminal or center, multifrequency signals are transmitted correctly. In addition, when it is necessary to recall the exchange during a call due to a transfer service, etc., the communication phase changes to "recall" upon the subscriber's recall request (for example, a hooking operation), and the information on the pushbutton switch is transferred to the signal channel (S) again. It can be sent by

In this embodiment, the signal channel and the audio channel are switched in the communication phase, but it is also possible to switch by operating a specific switch provided on the terminal. It is also possible to simplify the configuration of the terminal by always sending pushbutton switch information to both the audio channel and the signal channel. Furthermore, in this embodiment, the multi-frequency signal generation circuit generates an analog signal, but directly generates a PCM signal.
It is also possible to mix it with the audio signal after the encoder.

Here, the reason why the transmission of the pushbutton information is switched between the signal channel and the voice channel by operating the communication phase or switch is as follows. In other words, if, for example, push button information is converted into a code signal and is constantly sent to the signal channel regardless of the communication phase, the exchange will need a function to identify whether the code signal is a selection signal or a data signal, which is not economical. . Also, if push button information is converted into a multi-frequency signal and constantly sent to the audio channel,
Even unnecessary signals that do not need to be sent to the other party's terminal may be sent, causing inconvenience. Therefore, the above-mentioned problems can be solved by performing transmission control using a communication phase or the like.

As is clear from the above description, according to the present invention,
Services that can be used with conventional PB telephones can be provided to digital telephones without changing the exchange or center equipment, greatly improving serviceability.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a transmission information format, Fig. 2 is a configuration diagram of a part related to transmission signal generation of a digital telephone terminal that has been considered in the past, and Fig. 3 is a diagram showing an example of a transmission information format.
FIG. 4 is a block diagram showing an embodiment of the push button information sending system according to the present invention, and FIG. 4 is a diagram showing an example of the transition of communication phases in the present invention. 1: Push button switch matrix, 2: Code signal generation circuit, 3: Transmitter, 4: Amplifier, 5:
encoder, 6: frame assembly circuit, 7: transmission signal line, 8, 9: gate, 10: multifrequency signal generation circuit, 11, 12: resistor, 13: control circuit, 14,
15: Signal line.

Claims (1)

[Claims] 1. Digitized information is transmitted to either a switch or a line concentrator using at least two communication channels: a voice channel that encodes and transmits voice signals and a signal channel that transmits control signals. A plurality of pushbutton switches that selectively generate pushbutton information in a terminal device that transmits and receives between
means for generating a code signal based on the pushbutton information selected by the pushbutton switch and sending it to the signal channel; generating a multifrequency signal corresponding to the pushbutton information; A pushbutton comprising: means for transmitting to the audio channel; and control means for selectively controlling transmitting the code signal to the signal channel and transmitting the multifrequency signal to the audio channel. Information transmission method. 2. In the terminal device, the control means includes means for prohibiting sending the multi-frequency signal to the voice channel until receiving a specific signal arriving from either the exchange or the line concentrator. Claim 1 characterized in that
Push button information transmission method described in section. 3. In the terminal device, the control means includes means for prohibiting sending of the code signal to the signal channel after receiving a specific signal arriving from either the exchange or the line concentrator. A push button information sending system according to claim 1 or 2, characterized in that: 4. In the terminal device, the control means stops at least one of the transmission of the multi-frequency signal to the audio channel and the transmission of the code signal to the signal channel by operating a specific switch. 2. The pushbutton information sending system according to claim 1, further comprising means for releasing the stoppage.