JPS5851686A - Dial reception system - Google Patents

Abstract

PURPOSE:To simplify the reception processing and to reduce the burden in the central processing unit by receiving a dial pulse transmitted from a subscriber at a reception circuit via a time division channel, in a storage program control type electronic exchange. CONSTITUTION:In a storage program control type electronic exchange having a time division channel, a means DC transmitting a digital signal discriminating the open state of a subscriber loop to a time division channel TDSW is provided for a subscriber circuit LC, and a means DET detecting the digital signal receiving from the time division channel and a numeric analyzing circuit ANA are provided for a push button dial signal reception circuit DR, so that a dial pulse transmitted from a subscriber is received at the push button dial reception circuit via the channel TDSW. Thus, the reception processing of called telephone numbers can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dial reception system, and more particularly to a dial reception system in a storage program controlled electronic exchange having a time division communication path.

FIG. 1 is a diagram showing an example of a conventional dial reception system in this type of electronic exchange. In Figure 11g1, the telephone is placed horizontally through the subscriber circuit, the time division communication path TD through the path LCt-
The central processing unit CPU, which is housed in the SW and operates based on an exchange processing program stored in the memory device MEMK, identifies and analyzes the called telephone number sent from the calling telephone stack, and The called telephone is connected via the time division communication path TDSW. The signal format of the selection signal by which the calling telephone stack transmits the called telephone number includes a dial pulse format sent from a rotary dial telephone and a push button dial signal format sent from a push button dial telephone. Class 211 generally exists. The dial pulse format is transmitted to the exchange side by a DC dial signal that is intermittent at a predetermined rate and ratio according to the selected digit in a loop circuit (hereinafter referred to as subscriber loop) formed in the calling telephone stack. On the other hand, in the push-button dial signal format, a two-frequency signal within the voice band (hereinafter referred to as DTMF signal) corresponding to the selected telephone number is sent from the telephone and transmitted to the exchange side.On the other hand, in the time-division call path TDSW As is well known, the DTMF signal is transmitted via the time division communication path TDSwt- because it is configured to transmit the audio signal converted into a digital signal by the analog-to-digital converter A/D in the subscriber circuit LC. However, it is impossible to transmit the DC dial signal via the time-division communication path TDSW.Therefore, when the central processing unit *CPU detects a call from the telephone device, it changes the dialing format of the calling telephone horizontally. If it is determined that the signal is in the push button dial signal format, the subscriber circuit LC corresponding to the horizontal placement of the calling telephone is connected to the time division communication path T.
The DTMF signal sent from the calling telephone equipment connected to the DTMF receiver DTMFREC via the DS'w is converted into a digital signal by the analog-to-digital converter A/D in the subscriber circuit LC, and is sent to the time-division communication channel. The signal is transmitted to the DTMF receiver DTMFREC via the TDSW. D
The TMF receiver DTMFREC converts the received DT'' signal into a corresponding numerical code and transmits it to the central processing unit gLCPU via the scanning device flsCN. On the other hand, if it is determined that the calling telephone device is of the dial pulse type, the DC dial signal sent from the horizontally placed calling telephone is sent to the subscriber loop by a loop detection circuit in the corresponding subscriber circuit LC. Detected as open/closed state. The loop detection circuit converts the detected open/close state of the subscriber loop into a binary signal and transmits it to the central processing unit CPU via the scanning device fi1s CN. Central processing unit CPUFi Calling telephone equipment In case of push button dialing signal format, DTMF receiver DTMF
Each time the REC receives one digit of the called telephone number, the scanning device S
Since it is sufficient to receive the numeric code via the CN, the scanning period of the scanning device SCN is, for example, about 1001 seconds. It is necessary to identify each digit of the called telephone number from the binary signal indicating the open/closed state of the subscriber loop transmitted through the circuit SCN, and the intermittent rate of the commonly used 10 pulses per second or 20 pulses per second is In order to detect the binary signal shown in FIG.
The scanning period by N needs to be about 8 or 4 milliseconds, for example.

As is clear from the above explanation, according to the conventional dial reception method, the central processing unit CPU identifies the signal format of the calling telephone horizontally, and sets the receiving route for the called telephone number according to the identified signal format. The exchange process is complicated. In particular, when a dial pulse type telephone makes a call, it is necessary to scan at short intervals, and the central processing unit
This results in significant consumption of tCPU processing power.

It is an object of the present invention to eliminate the drawbacks of the conventional dial reception method as described above, to simplify the process of receiving the called party number sent by the calling telephone, and to do so without imposing a large burden on the central processing unit. The goal is to realize a dial reception system.

The purpose of this is to provide a storage program controlled electronic exchange having a time-division communication path with means for transmitting a digital signal to the time-division communication path to identify the open state of the subscriber loop, and to means for detecting the digital signal received from the channel and numeric analysis means are provided in the push-button dial signal receiving circuit, and the dial pulse sent by the subscriber can also be received by the push-button dial receiving circuit via the time-division communication channel. This is achieved by

An embodiment of the present invention will be described below with reference to FIG. Second
The figure is a diagram showing a dial reception method according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures. The difference between FIG. 2 and FIG. 1 is that the digital signal output from the analog-to-digital conversion circuit A/D of the subscriber circuit LC is sent to the time division communication path TDSW via the digital signal control circuit DCt-. In addition to the DTMF receiver DTMFREC, the push button dial receiving circuit DR includes a digital signal detection circuit DET and a numeric analysis circuit ANA.
This is due to the fact that this is provided. The digital signal control circuit DC is controlled by a binary signal output by a loop detection circuit that detects the open/closed state of the subscriber loop, and when the subscriber loop is in the closed state, the analog-to-digital converter A
/D is sent to its side time division communication path TDSW, and when the subscriber loop is in an open state DK, a special digital signal (hereinafter referred to as an open digital signal) indicating the open state 114t is transmitted. ) as the time division communication path TDSW
Send to. On the other hand, the digital signal detection circuit DET connects the time division communication path TDSW to the push button dial reception circuit D.
The digital signal transmitted to R is inspected, and only open digital signals are extracted and transmitted to the numerical analysis circuit ANA.

Numeric analysis circuit ANAit digital signal detection circuit DET
It counts and analyzes a series of open digital signals transmitted from the dial pulse type telephone device, converts the DC dial signal transmitted by the dial pulse type telephone device into a numerical code for each 1L character, and sends it to the scanning device 5CN1 like the DTMF' receiver DTMFREC. The information is transmitted to the central processing unit Cr'UK. When the central processing unit CPU detects a call from the telephone device in this state, regardless of whether the calling telephone is placed in the dial pulse type or the push button dial signal type, the time-sharing, t゛゜ call path TDSW is activated. Through the push button dial receiving circuit D
Connect to R. If the calling telephone is in the push-button dial signal format, the called telephone number selected by the subscriber while the subscriber loop is closed is sent as a single-digit DTMF signal, so The digital signal control circuit DC of the subscriber circuit LC receives the DTMF signal' converted into a digital signal output from the analog-to-digital converter A/D.
is transmitted to the push button dial receiving circuit DR via the time division communication path TDSW. Push button dial receiving circuit D
The digitalized DTMF signal transmitted to R is not detected by the digital signal detection circuit DET and is not detected by the DTMF receiver DTMFRECK! The data is received in the same manner as in the figure, converted into numerical codes, and transmitted to the central processing unit fcPUK via the scanning device 8CN. On the other hand, when the calling telephone device is of the dial pulse type, the digital signal detection circuit DC of the corresponding subscriber circuit LC is controlled by the loop detection circuit to detect the DC dial signal sent from the calling telephone installation. , during the break pulse when the subscriber loop is in the open state, the open digital signal is transferred to the time-shared channel TD.
It is transmitted to the push button dial receiving circuit DR via SW. The open digital signal transmitted from the push button dial receiving circuit DRK is sent to the DTMF receiver DTMFRECK.
YovtehreceptiontLf, digital signal detection circuit DE
The data is detected and transmitted to the numeric analysis circuit ANA.

The numeric analysis circuit ANA counts and analyzes one digit of the called telephone number sent by the calling telephone installation from the received open digital signal, converts it into a numeric code, and transmits it to the central processing unit CPUK via the scanning device SCN. do. Therefore, central processing unit C
Even when the calling telephone is placed in the dial pulse format, the PU receives the called telephone number from the push button dial receiving circuit at a scanning period of, for example, 100 milliseconds, as in the case of the push button dial system. I can do it.

As is clear from the above description, according to the present invention, in a storage program controlled electronic exchange having a time division communication path, the central processing unit does not need to identify the dial format of the calling telephone, and the same procedure can be used. However, since it is only necessary to receive and process the called telephone number one digit at a time, the receiving process of the called t'#i number is simplified and requires less central processing. The burden on the device is also significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional dial reception method, and the second diagram is a diagram showing a dial reception method according to an embodiment of the present invention. In the figure, the telephone is placed, Lc is the subscriber circuit, and TDS
Wtf time division communication path, DR is dial receiver a circuit, SC
N is a scanning device, cPU is a central processing unit, MEM is a main memory device, 5PcFi, communication path control circuit, LFi loop detection circuit, H is a 2-wire 4-wire switching circuit, A/D is an analog-to-digital converter, D/A is a digital to analog converter, DC
is a digital signal control circuit, DTMFRECt;! DT
MF receiver, DETtj: f digital signal detection circuit,
The ANAti digit analysis circuit is shown. ! 1 Diagram 2- Diagram

Claims (1)

[Claims] In a storage program controlled electronic exchange having a time division communication path, means is provided in the subscriber circuit for transmitting a digital signal identifying an open state of the subscriber loop to the time division communication path, and receiving the digital signal from the time division communication path. The means for detecting the digital signal and the numeric analysis means are provided in the push-button dial signal receiving circuit, so that the dial pulse sent by the subscriber can also be received by the push-button dial receiving circuit via the time division communication path. -Featured dial reception method.