JPS6051394A - Composite receiver - Google Patents

Abstract

PURPOSE:To receive various in-band frequency signals by a signal receiver of only one kind, and also to reduce the number of receivers by controlling a passing frequency of a band pass filter by a control signal for showing the classification of a signal. CONSTITUTION:A signal supplying circuit FG1, a signal supplying circuit FG2 and a signal supplying circuit FG3 are selected by a selecting circuit SEL in case when a signal classification signal S shows a multi-frequency signal, in case when it shows a PB signal, and in case when it shows a continuity test signal, respectively, and supplied to a digital band pass filter BPF. Accordingly, a composite receiver REC is capable of making the multi-frequency signal, the PB signal and the continuity test signal pass through in accordance with the transferred signal classification signal S.

Description

DETAILED DESCRIPTION OF THE INVENTION (al) Technical Field of the Invention The present invention relates to a signal receiving system, and particularly to a signal receiver capable of receiving multiple types of in-band frequency signals, and a method for transmitting the multiple types of in-band frequency signals. The present invention relates to a composite receiver that is commonly selectively connected to communication lines.

fbl Technology Background In automatic switching systems, for example, a PB double signal sent as a selection signal from a push button dial telephone, a multi-frequency signal (MF double signal,
Or, the frequency within the voice band of the continuity test signal used for the continuity test of the communication path of the common line signaling system relay line is 1 or more.
2. Many types of in-band frequency signals are used. This kind of in-band frequency signal is, for example, 69 in the PB double signal.
Low group 4 frequencies from 7 to 941 Hz and ]209 to 16
A total of 8 frequencies including 4 high frequencies of 33 Hz, and 6 frequencies of 700 to 1700 Hz for multi-frequency signals, and 1780 and 2010 frequencies for continuity test signals.
Different frequencies are used, such as two Hertz frequencies.

(C1 Prior Art and Problems Figure 1 is a diagram showing an example of a conventional signal reception method for this type of in-band frequency signal, and Figure 2 is a diagram without illustrating the configuration of the multifrequency receiver in Figure 1. Yes, Figure 3 is L in Figure 2.
4 is a diagram illustrating the configuration of a bandpass filter according to the present invention; FIG. 4 is a diagram illustrating the configuration of the signal supply circuit shown in FIG.

In FIG. 1, the switching device SW has an m1 communication line L1 that transmits a digital multi-frequency signal, and an m2 communication line L1 that transmits a digital PB double signal.
2, a communication line L3 of the m3 line that transmits the digital continuity test signal, n1 multifrequency receivers MFR that receive the multifrequency signal, and n2 that receives the PB multiple signal.
PB receivers PBR and 03 continuity test sound receivers CTR that receive the continuity test signal are accommodated.

As shown in FIG. 2, the multi-frequency receiver MFR includes a digital bandpass filter BP whose passing frequencies are the six frequencies.
F, a signal supply circuit FG1 that transmits a frequency determination signal gl (=time-division output of 2cosω1 to 2CO3ω6) that determines the pass frequency to the bandpass filter BPF, and a low frequency circuit that integrates the output of the bandpass filter BPF. It is composed of a filter LPF and a comparison circuit CMP that compares the output of the low-pass filter LPF with a predetermined darkness value to determine signal detection. When a general-purpose digital filter as illustrated in FIG. 3 is used, the bandpass filter BPF is composed of adders A1 to A4, multipliers M1 to M5, and delay devices D1 and D2. is multiplied by the frequency determination signal g1 supplied to the six frequencies, and the six frequencies are set as the passing frequencies. Further, the signal supply circuit FGI, as shown in FIG. 4, includes a memory MEM that stores the frequency determination signal g1 (=2cosω1 to 2CO3ωG), and a clock signal elk, and inputs the output as an address to the memory MEM. and a counting circuit CNT that sequentially extracts the frequency determination signal g1. As described above, the six frequencies are detected from the input signal i that arrives at every predetermined period, and output signal 0 is output. Note that the P13 receiver PBR and the continuity test sound receiver CTR are also connected to a signal supply circuit FG2 that supplies a frequency determination signal g2 that determines the eight frequencies that make up the PB (M number) as pass frequencies, or a signal supply circuit FG2 that supplies a frequency determination signal g2 that determines the eight frequencies that make up the PB (M number), or a signal supply circuit FG2 that makes up the continuity test signal. The switching device SW has the same configuration as shown in FIGS. 2 to 4 except that it uses a signal supply circuit FG3 that supplies a frequency determination signal g3 having the passing frequency as the passing frequency.
When a call arrives from 01, an arbitrary free multi-frequency receiver MFR is selected and acquired from 01, and connected to the communication line L1 through which the multi-frequency signal arrives. Similarly, when a call arrives from communication line 1-2, select and connect to the vacant PB receiver PBR, and when a call arrives from communication line L3, connect to the vacant continuity test tone receiver CT.
Select and connect R.

As is clear from the above explanation, in a conventional signal receiving system, in order to receive a multi-frequency signal, a PB double signal, and a continuity test signal, dedicated multi-frequency receivers MFR and P are used, respectively.
It was equipped with a B receiver PBR and a continuity test sound receiver CTR. Therefore, in response to the incoming calls from the communication lines Ll to L3, the switching device SW uses multi-frequency receivers MFR and P, respectively.
It is necessary to distinguish and selectively connect the 'B receiver PBR and the continuity test sound receiver CTR, which has the disadvantage that the selective connection function becomes complicated. In addition, the multi-frequency receiver MFR1PB receiver PBR and the continuity test tone receiver CTR respond to the incoming call volume from the communication lines L1, L2 and L3, respectively.
It was necessary to prepare the required numbers n1, n2, and n3, respectively.

ldl OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the drawbacks of the conventional signal reception methods as described above, to simplify the selective connection function of the signal receiver for incoming calls transmitting various in-band frequency signals, and to The objective is to realize a means to reduce the number of required pieces as much as possible.

(el) Structure of the Invention The object of the present invention is to provide a plurality of sets of signal supply circuits that supply signals for determining the passing frequency of a digital bandpass filter, and a selection circuit that selects one of the signal supply circuits, each of which This is achieved by commonly receiving multiple types of in-band frequency signals composed of one or more different frequencies, and transmitting the type of the in-band frequency signal transmitted by the connected communication line to the selection circuit. .

(fl　Embodiments of the invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a diagram illustrating a composite receiver according to an embodiment of the present invention, and FIG. 6 is a diagram illustrating a signal receiving system according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures. In FIG. 5, the composite receiver includes a digital bandpass filter BPF, a low-pass filter LPF, a comparator CMP, and a signal supply circuit FGI for multi-frequency signal reception similar to that shown in FIG. In addition, there is a signal supply circuit FG2 for receiving the PB signal, a signal supply circuit FG3 for receiving the continuity test signal, and the above three types of signal supply circuits FGI to FG3.
and a selection circuit SEL for selecting one of the two.

When the signal type signal S transmitted from the switching device SW indicates a multi-frequency signal, the selection circuit SEL selects the signal supply circuit F.
GI is selected and the frequency determination signal g1 is passed through the bandpass filter BPF.
When the signal type signal S indicates a PB double signal, the signal supply circuit FC2 is selected and the frequency determination signal g2 is supplied to the bandpass filter BPF, and when the signal type signal S indicates a continuity test signal. selects the signal supply circuit FG3 and supplies the frequency determination signal g3 to the bandpass filter BPF. Therefore, the composite receiver RPC can receive any of the multi-frequency signal, the PB multiple signal, and the continuity test signal, depending on the signal type signal S to be transmitted.

As a result, in FIG. 6, in addition to the communication lines Ll to L3, the switching device SW has only one type of composite receiver REC: n4Il? II is accommodated. When a multi-frequency signal arrives from the communication line L1, the switching device SW selectively connects an arbitrary vacant composite receiver REC and transmits a signal type signal S indicating the multi-frequency signal to the connected composite receiver REC. In the composite receiver REC which has received the signal type signal S, the selection circuit SEL selects the signal input circuit FGI and connects it to the bandpass filter BPF, thereby preparing to receive the multi-frequency signal.

When a call arrives from the communication line L2 where the PB double signal arrives, the switching device SW selects and connects an arbitrary vacant composite receiver REC, and transmits a signal type signal S indicating the PB double signal to the connected composite receiver REC. In the composite receiver RFC that has received the signal type signal S, the selection circuit SEL selects the signal (P) feed circuit FG2 and connects it to the bandpass filter BPF.
Prepare to receive R times signal. Furthermore, when a continuity test signal arrives from the communication line L3, the switching device SW selects and connects an arbitrary vacant composite receiver REC, and transmits a signal type signal S indicating the continuity test signal to the connected composite receiver REC. . In the composite receiver REC that has received the signal type signal S, the selection circuit SEL selects the signal supply circuit FG3 and connects it to the bandpass filter BPF, thereby preparing to receive the continuity test signal.

As is clear from the above description, according to this embodiment, in order to receive the multi-frequency signal, the PB multiple signal, and the continuity test signal,
Since only one type of composite receiver REC is prepared, the switching device SW always selects and connects the composite receiver REC, regardless of the type of signal arriving from the incoming communication lines Ll to L3, and receives the signal according to the signal type signal S. The signal type to be transmitted is transmitted. Therefore, the usage efficiency of each composite receiver REC is improved compared to each multi-frequency receiver MFR, PB receiver PBR, and continuity test sound receiver CTR in FIG. 1, and as a result, the required number of composite receivers REC is , is smaller than the sum of the required numbers (nl+n2+n3) of the multi-frequency receiver MFR, PB receiver PBR, and continuity test sound receiver CTR in FIG.

Note that FIGS. 5 and 6 are only one embodiment of the present invention, and for example, a composite receiver r? The configuration of Ec is not limited to that shown in the drawings, and many other modifications may be considered, but the effects of the present invention will not change in any case. Furthermore, the signals to which the present invention is applied are not limited to multifrequency signals, PB multiplied signals, and continuity test signals, and many other modifications may be considered, but the effects of the present invention will not change in any case. do not have.

(a) Effects of the Invention According to the present invention, various in-band frequency signals can be received by only one type of signal receiver. The selective connection function is simplified, the number of signal receivers required is reduced, and economical efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional signal reception system, FIG. 2 is a diagram illustrating the configuration of the multifrequency receiver in FIG. 1, and FIG.
Figure 4 is a diagram illustrating the configuration of the bandpass filter in Figure 2, Figure 4 is a diagram illustrating the configuration of the signal supply zero detection circuit in Figure 2, and Figure 5 is a composite reception according to an embodiment of the present invention. FIG. 6 is a diagram showing a signal receiving system according to an embodiment of the present invention. In the figure, A1 to A4 are adders, BPF is a bandpass filter, clk is a clock signal, CMP is a comparison circuit, CNT
is a counting circuit, CTR is a continuity test sound receiver, Dl and D
2 is a delay device, FGI to FG3 are signal supply circuits, gl to g3 are frequency determination signals, i is an input signal, Ll to L
3 is a communication line, LPF is a low-pass filter, Ml to M5
is a multiplier, ml to m3 is the number of lines, MEM is a memory, M
FR is a multifrequency receiver, nl to n4 are the number, 0 is an output signal, PBR is a PB receiver, REC is a composite receiver, S is a signal type signal, SEL is a selection circuit, and SW is a switching device. Answer 1 Zutei 2 Prisoner 1 1 yen-3 fig. 4- Zuhaya ri Sencha A fig.

Claims (1)

[Claims] A plurality of sets of signal input circuits that supply signals that determine the pass frequency of the digital bandpass filter, and the signal supply circuits that supply the signals that determine the pass frequency of the digital bandpass filter. 8, which commonly receives a plurality of types of in-band frequency signals composed of one or more different frequencies, and also includes a selection circuit for selecting one of the above-mentioned in-band frequency signals transmitted by a connected communication line. A composite receiver characterized in that the type of signal is transmitted to the selection circuit.