JPS60172899A - Receiving system of selection signal - Google Patents

Abstract

PURPOSE:To receive a selection signal without discrimination of a PB subscriber or a DP one prior to the reception, to reduce necessary processes for preparation of the reception of a selection signal and to shorten its processing time by providing a digital signal processor capable of processing of selection signals of both a digitized multiplex frequency code (PB) and a dial pulse (DP). CONSTITUTION:A PB signal transmitted from a telephone set 1 reaches a subscriber circuit 2 of an exchange III through a subscriber line II and arrives at a two-line/four-line convertor circuit 10 through a service voltage circuit 11, where it is two-line/four-line converted. Then, it reaches an encoder 8, is placed on a time slot corresponding to the 1st channel of an assigned path (1) through a subscriber circuit control circuit 12, and transmitted to a selection signal receiver 5. Said receiver 5 receives digital signals transmitted from the subscriber circuit 2, processes them, discriminates a DP signal consisting of loop-off signals of the subscriber telephone set 1 and a PB signal consisting of loop-on signals followed by a loop-off signal, and transmits the numeric information obtained by the discriminated result to a controller 3 through a scanning circuit.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a selection signal receiving system, and more specifically, to a selection signal receiving system capable of receiving either PB or DP selection signals.

Conventional technology and problems In the selection signal reception method of conventional exchanges, multi-frequency signals (P
B) Separate signal receivers are provided for each type of selected signal called dial pulse (DP), and when a subscriber's call is detected, the subscriber information is read based on the receiving position and PB is transmitted. It identifies whether subscriber-4 is a DP subscriber, and connects to a dedicated PB receiver and DP receiver to receive a selection signal.

Conventional analog exchanges received multi-frequency signals (PB) as t-analog signals, so the PB receiver consisted of an analog filter9, while a dial pulse (
Since the DP receiver monitored the on/off status of the DC loop of the subscriber line and received signals by counting the OFF pulses, the hardware configurations of the PB receiver and DP receiver were completely different.

Furthermore, since the receiver has a large amount of physical quantity, the PB receiver and DP receiver have been separated from the viewpoint of economy and miniaturization.

However, in this conventional system, it is necessary to identify whether a subscriber is a PB subscriber or a DP subscriber when a call is detected by the subscriber. By reading the subscriber data stored in the secondary storage device (file memory) to the main storage device (main memory) based on the information and analyzing it, P
Determine whether the subscriber is a B subscriber or a DP subscriber, and select an available PB for each.
Connected to receiver and DP receiver. Therefore, a lot of processing is required to prepare for receiving a series of selection signals until this connection is completed.

OBJECTS OF THE INVENTION The present invention includes a digital signal processing device capable of processing a digitized multi-frequency code (PB), thereby allowing a PB subscriber to receive a selection signal in advance by a selection signal receiving device that performs numeric identification. It is an object of the present invention to receive a selection signal without performing identification processing to identify whether it is a DP subscriber, and to reduce the processing and time necessary for preparing to receive the selection signal.

Examples of the invention Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a connection diagram showing an outline of an embodiment of the present invention.

In the figure, 1 is a PB type or D type installed in a delivery service.
P-type subscriber telephone set, ■ is a subscriber line, and ■ is a time-sharing subscriber exchange. In the exchange ■, 2 is the subscriber circuit, 3
4 is a control circuit, 4 is a time division communication path device, 5 is a PB/DP merging selection signal receiving circuit which functions as a digital input register trunk, and 13 is a digital dial tone sending circuit. circuit (DT rank).

In the subscriber circuit 2, 6 is a DC loop monitoring section, 7 is a balancing network, 8 is an encoder, 9 is a decoder,
10 is a 2-wire/4-wire conversion circuit, 11 is a power supply circuit, and 12 is a subscriber circuit control circuit. Although only one each of the telephone set 11 subscriber circuit 2, selection signal receiving circuit 5, etc. is shown,
In reality, a large number of them are provided in an exchange.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

When a subscriber makes a call on the telephone 1, a power supply relay (not shown) of the power supply circuit 11 of the subscriber circuit 2 operates, and the DC loop monitoring unit 6, which is constituted by the contacts of the power supply relay, detects the direct current of the telephone subscriber circuit. The formation of a loop (loop-on) is detected and the subscriber circuit control circuit 12 is notified of this. In this way, the DC loop monitoring unit 6 monitors the DC loop status of the subscriber's telephone, and when detecting loop on and loop off, sends corresponding signals (loop on and loop off signals) to the subscriber. The control device 3 receives the loop-on and loop-off signals through a scanning device (not shown). Now, as described above, when the control device 3 detects a call due to the change of the state of the telephone 1 from loop-off to loop-on, the control device 3 selects the vacant PB/DP merge selection signal receiving circuit 5. and select the vacant route of the time division communication path device 4 (in this case, including two time slots).
(2) is connected to the call transmission side terminal St of the subscriber circuit 2 through the digital dial tone transmission circuit 13.
Similarly, it is connected to the call receiving side terminal S of the subscriber circuit 2 via an empty channel (2) (one channel for this) of the time division communication path 4.

The same applies to the PB double signal communication signal sent from the telephone set 1) which reaches the subscriber circuit 2 of the exchange ■ via the subscriber line ■, and further passes through the power supply circuit 11 of the subscriber circuit 2 to the 2-wire 4-wire conversion circuit 10. It is then subjected to 2R4-line conversion and sent to the encoder 8.9. 0° encoded (converted into a digital signal) and sent to the selection signal receiver 5 via the subscriber circuit control circuit 12 in a time slot corresponding to the first channel of the assigned route (2).

Note that the DP double signal sent from the telephone 1 and the on-hook signal of the handset are transmitted depending on the state of the loop across the telephone 10, so the loop-on and loop signals of the DC loop monitoring section 6 - The off signal is digitized in the subscriber circuit control circuit 12 and placed on the time slot corresponding to said assigned second channel, selected in the same frame as the time slot carrying said first channel. The signal is transferred to the signal receiving circuit 5.

Note that the digital dial tone signal sent from the digital dial tone sending circuit 13 is conveyed to the call signal receiving terminal R of the subscriber circuit 2 via the path (3).
Further, it reaches the decoder 9 via the subscriber circuit control circuit 12,
Here, it is decoded into an analog signal, and the 2-wire 4-wire conversion circuit 10
and is sent to the telephone 1 via the power supply circuit 11.

FIG. 2 is a distribution diagram of the signal from the subscriber circuit 2 to the selection signal signal generator 5, and shows the allocation of time slots constituting one frame on the highway on which the signal travels. . FIG. 2 shows the time slot structure of a frame on a highway. Fl and F2 are frames 'fc and TSo, respectively.

TSl, TS2. -...TSn, TSn+t, T
Sn+g, -= TSp ij indicates a time slot on one frame.

In FIG. 1, from the subscriber circuit 2 to the selected number receiving circuit 5
In the first time slot in one frame of the highway to e.g. TSn the digitized speech signal,
However, in this case, the PB signal is opened and the second time slot, for example TSH+s, is assigned a digitized loop on or loop off signal.

The selection signal receiving circuit 5 receives the digital signals carried by the first and second time slots.

In short, the subscriber circuit control circuit 12 inputs the multi-frequency (P B :) signal converted into a PCM code (digital) by the encoder 8 into the first time slot, and outputs the DC loop on signal, which is the detection result of the DC loop monitoring section 6, into the first time slot. The off signal is sent to the signal receiving circuit 5 in the second time slot.

The selection signal receiving circuit 5 receives the digital signal sent from the subscriber circuit 2, processes it, and sends it to the loop of the subscriber telephone 1.
OFF, and further identifies the DP double signal and PB other signals consisting of the loop-ON signal that follows this loop-OFF, and transmits the numerical information obtained as a result of the identification to the control device 3 via a scanning circuit (not shown). I'll go.

The selection signal receiving circuit 5 is obtained from a digital signal processing circuit such as a digital Fourier transform circuit or a digital filter and a control circuit (microprocessor), or a microprocessor capable of processing digital signals.
It can be configured with a processor.

Note that such a selection signal receiving circuit 5 is described, for example, in the literature (IEICE Technical Report 5E82-27 Design and Evaluation of Multi-Frequency Signal Receiver Using LSI Digital Signal Processing Device).

Kogure, Terada) and literature (1704 IEICE General National Conference 1704 Dial Pulse Receiver Using Microprocessor, Takei et al.).

FIG. 3 is a flowchart of the process of the embodiment of FIG. 1 including the selection signal receiving circuit 5. In FIG.

First, in step S-1, the control device 3
0 When call detection is performed, the process moves to step 0, S-2,
As described above, the call signal output terminal S of the subscriber circuit 2 of the telephone set 1 is connected to the selection signal receiving circuit 5, and the process moves to step S-3 to prepare for starting the PB signal receiving process.

Next, proceeding to step S-4, the loop carried by TSH+x (in the second time slot in FIG. 2 above) is
Check the on signal, determine whether the loop has turned off, and if the loop has not turned off (if NO),
Proceeding to step S-5, the first time slot TS
It processes the reception of the digital PB signal sent on the digit number N, and temporarily stores the received number in a buffer register (not shown).

Next, the process moves to step S-6, where the received digits are read from the buffer register, outputted, and notified to the control device 3, and the process returns to step S-4.

In this way, the PB and other signals that arrive one after another are sequentially received and processed, and the respective received numbers are notified to the control device 3 in the same manner as described above. When the control device 3 receives all the predetermined digits of the selection number, it determines that reception of the selection signal has ended, releases the connection of the path (3), and releases the selection signal receiving circuit 5. If the telephone 1 is a PB telephone, reception of the selection signal is completed in the above manner, and the process proceeds to the next connection process.

Assume now that telephone 1 is not a PB telephone but a DP telephone and that a DP double signal is sent as a selection signal.

When the first dial pulse arrives and the loop is off, this information is notified to the selection signal receiving circuit 5 in the second time slot TSn+t shown in FIG.

In the selection signal receiving circuit 5, it is assumed that the selection signal reception process is progressing and the process of receiving the selection signal is progressing to step S-4. At this time, the selection signal receiving circuit 5 receives the loop off information,
Detecting DC loop off in step S-4,
Therefore, the process branches to step S-7 and prepares to start the DP signal reception process.

In the next step S-8, the timing at which the loop-off signal continues to arrive is checked, and when the loop-off duration exceeds a predetermined value, it is determined that dialing has been abandoned midway, and in step S-9 Then, a mid-term abandonment processing request is made to the control device 3.

This releases the above connection.

In step S-8, if the duration of the loop off is within a certain period of time, the DP multiplication signal is determined, and in step 5-10
, and receives the DP multiplied signal (Q processing) carried by the input loop on and loop off signals.Next, moves to step 5-11, and outputs the received DP multiplied signal information to the control device 3. At the same time, the process returns to step S-8, and the reception process of the next arriving DP polarized code is executed in full order.In this case, each time a dial pulse in the DP double signal is received, the control device 3 is notified and the control The device 3 counts the dial pulses for each selected number of each phase.Alternatively, the selection signal receiving circuit 5 counts the dial pulses, buffers them as numerical information, and then notifies the control device 3. When the control device 3 receives a selection number of a predetermined number of digits, it determines that reception of the selection signal is complete, releases the connection path (2), and also switches the selection signal receiving circuit 5 on. Releasing is the same as above.

When receiving the selection signal, the on/off information of the DC loop of the subscriber line is first transmitted from the subscriber circuit 2 to the control circuit.
After the control circuit 3 identifies the state of the subscriber line and determines that the subscriber is a DP subscriber, the selected phone number reception circuit 5
It is also possible to use a control method in which a command to shift to the DP signal reception mode is sent to the DP signal receiving mode.

The present invention is not limited to the above embodiments, and various modifications can be made within the technical scope thereof.

As described in detail, according to the present invention, it is not necessary to identify whether a PB subscriber or a DP subscriber is based on the subscriber's accommodation location information; Since the selection signal can be received, there is an effect that the amount of programs and processing amount of the central processing unit for receiving the selection signal can be reduced.

Further, according to the present invention, since one type of receiving circuit with the same configuration is used for receiving DP and PB double signals, PB
Compared to the case where dedicated receivers and DP dedicated receivers are provided, the appearance of traffic can be improved and the total number of selection signal receivers can be reduced.

Although the present invention has been described in detail regarding the subscriber line signaling system consisting of PB and DP double signals, it can be similarly applied to the interoffice signaling system consisting of MF and DP double signals, and in this case, only one type of selection is required. This has the advantage that it is only necessary to prepare a signal receiver.

[Brief explanation of drawings]

Fig. 1 is a connection diagram showing an overview of one embodiment of the present invention, Fig. 2 is a configuration diagram of a signal from the subscriber circuit to the selection signal receiver in Fig. 1, and Fig. 3 is a flowchart of the processing of the present invention. It is. ■...In-house, ■...Subscriber line, ■...Time division exchange, 1...Subscriber telephone, 2...Subscriber circuit, 3...
... Control circuit, 4... Time division communication path device, 5... Selection signal receiving circuit, 6... DC loop monitoring section, 7...
Balancing network, 8... Encoder, 9...
- Decoder, lO... 2-wire 4-wire conversion circuit, 11... Power supply circuit, 12... Subscriber circuit control circuit, 13... Digital ear tone sending circuit. Patent Applicant: Nippon Telegraph and Telephone Public Corporation Patent Attorney Hisashi Tamamushi (2 others) Go to Figure 2, Figure 3, Control Device 3

Claims (1)

[Claims] In the time division exchange that accommodates the subscriber line, the PB double signal sent from the subscriber line is digitized and transmitted, and
A subscriber circuit that monitors the DC loop of the subscriber line, identifies loop-on and loop-off signals, and digitizes and transmits the loop-on and loop-off signals; and a selection signal receiving circuit for identifying selected numbers by digital processing from any selection signal of dial pulse (DP) signals, and digitizes the subscriber circuit of the calling subscriber when the subscriber makes a call. connected to the selection receiver circuit by a path capable of transmitting both the digitized loop on and loop off signals, and the selection signal receiver monitors the loop on and loop off signals. ,
When the loop is on, the PB signal reception process is executed, but when the loop off is detected, the PB signal reception process is stopped and the process shifts to the DP double signal reception process carried by the loop on and loop off signals mentioned above. A selective signal reception method characterized by