JPS59183540A - Signal selecting and receiving device - Google Patents

Abstract

PURPOSE:To prevent the generation of noise due to unnecessary call tone even if each receiving station is called simultaneously by using the output of a storage circuit storing an output of each signal receiving circuit and identifying the call of the own station as a gate signal. CONSTITUTION:In calling the receiving stations from a master station simultaneously, a signal combining tone signals (a,1,2),(a,3,4)... corresponding to the receiving stations 1G, 2G... respectively is transmitted sequentially and a tone signal (b) in common to each receiving station is added to the end. For example, the tone signal a, 1, 2 is received respectively by tone receiving circuits 22-24 of the receiving station 1G, this receiving information is stored in the storage circuit 25 to identify the calling of the own station. Then, the trailing of the common tone signal (b) is detected by a detecting circuit 29 and a signal from the detecting circuit 29 is transmitted to a holding circuit 30 via a gate circuit opened by own station calling identification information from the storage circuit 25 in advance.

Description

Detailed Description of the Invention (1) Technical Field of the Invention The present invention relates to a signal selective reception (ti+ device) in a selective calling system that selectively calls multiple receiving stations via wireless transmission/channels, The present invention relates to a receiving device that prevents unnecessary tone signal sound from being emitted from a speaker when the speaker is sounded by a high-output amplifier.

(2) Prior Art and Problems A conventional signal selection receiving device will be explained with reference to FIGS. 1 and 2.

In FIG. 1, (a) is a block diagram showing the main part configuration of the signal selection receiving device, and (0) represents the configuration of the selective calling signal used here.

In the figure, 1 is a low frequency signal input terminal (the reception antenna and radio receiver provided in the previous stage are not shown), 2 to 4 are tone signal receiving circuits, 5 is a memory circuit, 6 is a gate circuit,
7 is an amplifier, and 8 is a speaker.

Here, when selectively calling the receiving station IG from the master station,
As shown in FIG. 1(b), tone signals a and 1°2 are combined and sent out.

The tone signal a+1.2 is received by the tone receiving circuits 2 to 4 provided corresponding to each tone signal, and the output is stored in the storage device 5 to identify that the local station has been called. .

The gate circuit 6 is opened by the information from the storage device 5, the amplifier circuit 7 is connected to the low frequency signal input terminal, and the speaker 8 is sounded by the low frequency input signal.

However, in the above-mentioned receiving device, when simultaneously calling receiving stations 2G and 3G having similar configurations, the tone signal for calling other stations is sent to the receiving station IC.

There was a problem that the speaker was ringing when received on 2G. In other words, when calling receiving stations IG to 3G all at once, the first
As shown in figure (b), tone signals (a, 1.2), (a, 3.4), (a,
5.6) are sequentially transmitted from the master station, but the tone signal (a+
In the receiving station IG (the same applies to 2G), which receives 1°2) and has already connected the speaker 8 and input terminal 1,
A subsequent ring tone is played from the speaker 8 and is noisy.

In order to solve the problems of the receiving device shown in FIG. 1, the signal selection receiving device shown in FIG. 2(a) was proposed. It is the composition.

A common tone signal a is provided at the beginning of the tone signal for selectively calling each receiving station.

(Figure 2 (b)) In Figure 2 (a), 1'11 is a low frequency signal input terminal, 12 to 14 are sheet signal receiving circuits, 15 is a memory circuit,
19 is a restart type delay circuit, 2o is a gate circuit, 16 is a connection circuit, 17 is an amplifier, and 18 is a speaker 0 Here, the restart type delay circuit 19 is a tone receiving circuit 12 that receives the common tone signal a. When the common tone signal is received again after a predetermined delay time T (see Figure 2 (b)), the timer is reset and the delay time T is set each time. be. Therefore,
By setting the delay time T, at least longer than the combination of tone numbers for calling each station, even in the case of simultaneous calling, the common tone signal a for the last station calling can be used. Until 13 hours have elapsed after the reception of the
6 cannot be connected. Therefore, the tone signal for subsequent station calls does not flow as noise from the speaker 18.

However, in the receiving device shown in Fig. 2, the speaker does not ring until a certain period of time T has elapsed after receiving the common tone signal, and the first part of the report from the master station is not played from the speaker. There is a problem.

In order to solve this problem, it is possible to make a report after a certain period of time has elapsed after sending out a tone signal, but if an urgent report is required, such a method is not recommended. could not be adopted.

(3) Purpose of the Invention The present invention has been devised in view of the problems of the prior art described above. It is an object of the present invention to provide a signal selection receiving device that can be used in emergencies.

(4) Structure of the Invention Furthermore, it is an object of the present invention to provide a signal selection receiving device in a selective calling system that selectively calls a plurality of receiving stations via a wireless transmission path. a signal receiving circuit, a storage circuit that stores the output of each signal receiving circuit and identifies and stores that the own station is called, a detection circuit that detects the falling edge of a tone signal common to each receiving station; A signal selection receiving device is provided which has a gate circuit that passes the output of the detection circuit in accordance with the output of the storage circuit, and a holding circuit that connects an input signal to an amplifier and holds it in accordance with the output of the gate circuit. 〇(5) Embodiment of the Invention Achieved by the following, an embodiment of the present invention will be described below with reference to FIG.

In FIG. 3, (A) is a block diagram showing the structure of the sandwich part of the signal selective receiving apparatus according to the present invention, and (0) shows the structure of the selective calling signal used here.

In the figure, 21 is a low frequency signal input terminal, 22 to 24 are tone signal receiving circuits, 25 is a memory circuit, 26 is a gate circuit, 2
7 is an amplifier, 28 is a speaker, 29 is a detection circuit for detecting the fall of a tone signal common to each receiving station, and 30 is a signal inputted from the input terminal 21 according to the output of the gate circuit 26 and connected to the amplifier 27. and a holding circuit that holds this, a
, 1 to 6 are tone signals, and b is a tone signal common to each receiving station.

When the master station calls receiving stations IG to 3G all at once, as shown in FIG. 3(b), each receiving station IG.

Tone signal (a+L2), (a + 314)l (a, 5+) compatible with 2G, 3G, etc.
6) Send out the combined signals of It is not necessary to provide this for all cycles, and different tone signals may be added to the beginning of each cycle, as shown in FIG. 1(B).

For example, in receiving station IG, tone signals of a+1.2 are received by tone receiving circuits 22, 23, and 24, respectively, and this received information is stored in storage circuit 25 to identify that the own station has been called. 0 Next, the detection circuit 29 detects the fall of the common tone signal S, and the signal from the detection circuit 29 is sent to the holding circuit 30 via a gate circuit that has been opened in advance according to the local station call identification information from the storage circuit 25. send to

The holding circuit 30 is activated by a signal based on the detection of the falling edge of the common tone signal, and operates the amplifier 27. The operation of the amplifier 27 amplifies the input signal from the input terminal 21, causing the speaker 27 to sound.

As described above, in the receiving apparatus shown in FIG. 3(A), unless a common signal is received, the speaker does not ring, and unnecessary tone signal sounds are not emitted from the speaker as noise. Furthermore, since it is not configured using a delay circuit or the like, it is possible to immediately report without waiting for a certain period of time after receiving the common signal.

In addition, in the signal selection receiving device according to the present invention, it is possible to terminate the ringing of the speaker by receiving a specific reset signal, and the above-mentioned common tone signal can be used as the reset signal. That is, when the holding circuit 30 is in the operating state, the common tone signal S is used as a reset signal to terminate the operation of the amplifier 27, and when the holding circuit 30 is in the inactive state, the common tone signal S is used as the set signal. , which starts the operation of the amplifier 27.

In addition, in the above explanation, the operation in the case of single calling has been explained, but when calling each receiving station individually, the above-mentioned combination of each station calling tone signal, for example (all1
2') etc., the common tone signal is then sent.

(6) Effects of the Invention According to the present invention, in a selective calling method that selectively calls a plurality of receiving stations via a wireless transmission path, even when all receiving stations are called at the same time, unnecessary discharge noise is generated. The generation of noise can be prevented, and in case of an emergency, a report can be made from the master station immediately after the call ends.

[Brief explanation of drawings]

1 and 2 are diagrams showing a conventional signal selection receiving device and the configuration of a calling signal used therein, and FIG. 3 is a diagram showing a signal selection receiving device according to the present invention and the configuration of a calling signal used therein. , 1.11.21 is a low frequency signal input terminal, 2゜3,
4.12.13.14.22.23.24 is a tone signal receiving circuit, 5, 15.25 is a storage circuit, 6.20°26
is a gate circuit, 7.17.27 is a low frequency amplifier, 8.1
8. 28 is a speaker, 19 is a restart type delay circuit, 16 is a connection circuit, 29 is a common tone falling detection strategy, 30
is a holding circuit.

Claims (1)

[Claims] In a signal selection receiving device using a selective calling method that selectively calls a plurality of receiving stations via a wireless transmission path, a plurality of signal receiving circuits corresponding to tone signals and a self-containing device that accommodates the output of each signal receiving circuit are used. A memory circuit that identifies and stores that a station is called; a detection circuit that detects the falling edge of a tone signal common to each receiving station; and a gate circuit that passes the output of the detection circuit in accordance with the output of the memory circuit. and a holding circuit that connects an input signal to an amplifier and holds the input signal according to the output of the gate circuit.