JPH0329084A - Wireless call display system - Google Patents

Abstract

PURPOSE:To facilitate system design by receiving and demodulating the radio signal from a wireless transmitter by plural wireless reception units to convert it to low-frequency demodulated signals and performing the signal processing by the OR signal of these demodulated signals. CONSTITUTION:In a repeating unit 3 connected through a signal line l, the input terminal of an amplifier AMP which has the input terminal pulled up by a resistance R and the signal line l are connected to constitute the wired OR connection. Therefore, the OR signal of transistors Q1 to Q3 of wireless reception units 20 to 22 is outputted from the amplifier AMP. The OR signal is transmitted to a signal processing circuit 4a of a display unit 4 to perform the signal processing. Since the signal processing is performed by the OR signal of low-frequency signals received and demodulated by wireless reception units 20 to 22, problems due to the increase of the number of antennas and synthesis with high frequency are resolved to facilitate system design.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention is directed to improving a wireless call display system. [Traditional technique fI] Big these days! ? ! A large number of restaurants have been established, and these restaurants are increasingly adopting wireless call display systems in order to provide prompt service. In such a wireless call display system, when a customer operates a button on a wireless transmitter attached to each table, a wireless signal is output, and a wireless receiver receives and demodulates this wireless signal to alert a waitress or other customer service person. By displaying numbers on a display unit mounted in an easy-to-see position, this system enables prompt service. FIG. 4 shows wireless reception Ill00 and 11 used in such a system constructed using radio signals.
A display unit 200 having a display window 200a... is shown, and a wireless receiver equipped with an antenna 100a1tI receives a radio wave signal containing data for display outputted from a wireless transmitter (not shown). By demodulating the demodulated signal and processing the demodulated signal, a display control signal corresponding to the unique data of the wireless transmitter is output to the display unit 200, and one display corresponding to the unique data is displayed.
B200a... is configured to light up. However, the wireless transmitter I8B and the wireless receiver Il
When the distance from the wireless transmitter 11100 is large, or when the installation situation is such that it is blocked by a fence and cannot be seen, the radio signal from the wireless transmitter will attenuate, so even if the radio signal is received by the wireless receiver 11100, it will not be necessary for control. Since it cannot be amplified to this level, it cannot be controlled. As a countermeasure to this problem, as shown in FIG. 4a, an external antenna 100b having a higher gain than the antenna 100a is added to the antenna extension terminal (not shown) of the wireless receiver III 00. However, with such measures, the external antenna 3
In order to increase the gain of 00b, it is necessary to have directivity, so the reception area is reduced and the two antennas 1
00a, 100b are connected in parallel to the wireless receiver 100, so that the wireless receiver 1001! ! This makes it difficult to match high-frequency impedance without attenuating it. In addition, the antenna 100a and the external antenna 1
Installation rI/5P (for the wavelength of radio waves used) with 00b
1 and the direction of the radio signal, both antennas 10 0 a. Since a null point occurs where the signals received at 1 0 0 b cancel each other out, an improvement is desired. [Problems to be Solved by the Invention] In view of the above circumstances, the present invention has been proposed, in which each demodulated signal is individually received and demodulated by a plurality of wireless receiving units. II Il
1'! By performing signal processing on the OR signal of
The purpose of the present invention is to provide a wireless call display system that can be displayed if it is reliably received and demodulated by any wireless receiving unit, can easily expand the reception area, and is easy to set up. ．．

[Means to solve the problem]

The present invention as set forth in claim 1 proposed to achieve the above object includes: a plurality of wireless transmitters that transmit wireless signals including unique data for display in response to operation of an operation button; at least l wireless receiving units that receive and demodulate the radio signal transmitted from the transmitter and output a t'1 modulated signal including the unique data; and simultaneously receive the demodulated signal output from each of the wireless receiving units. It has a relay unit that obtains a logical sum signal of these demodulated signals and a plurality of display windows, and processes the logical sum signal output from the relay unit and displays it on the display window corresponding to the above-mentioned unique data. The configuration includes a display unit that performs the following functions. The present invention according to claim 2 also provides a wireless centralized control system that has operation buttons for the number of rows, and that transmits a wireless signal containing unique data for display corresponding to each operation button in response to operation of the operation button. It is configured to further include a transmitter. Further, in the present invention as set forth in claim 3, the relay unit and each of the wireless receiving units are connected in a wired-OR connection, so that the relay unit side can logic the demodulated signal output from each of the wireless receiving units. It is configured to obtain a sum signal. [Function] In the present invention as set forth in claim 1, when the operation button of the wireless transmitter is operated, a wireless signal containing unique data for display is output. This radio signal is simultaneously received and demodulated by at least one wireless receiving unit, and these demodulated signals are transmitted to a relay unit. The relay unit calculates a logical sum signal of these demodulated signals and transmits it to the display unit, and the display unit processes this logical sum signal and displays it on a display window corresponding to the unique data. In the present invention according to claim 2, when any one of the plurality of operation buttons of the wireless central transmitter is operated,
It outputs a wireless signal containing unique data for the display set corresponding to that operation button. Further, in the present invention as set forth in claim 3, the demodulated signal output from each wireless receiving unit is transmitted to the relay unit as a logical sum signal by wired-or connection. [Examples] Examples of the present invention will be explained below with reference to the drawings. Figure @1 is a configuration diagram of the wireless call indication system of the present invention according to claim 1. In the figure, 1●◆ is a wireless transmitter with an operation button 1a, and inside it is provided a display number setting switch (not shown) for setting a display number (in this embodiment, a display number setting switch (not shown) is used to set a display number. Display of unit 4!!Setting numbers 1 to 8 are provided corresponding to the song of 4a), and when operation button 1a is operated, a high frequency radio wave signal containing the unique data set with the display number setting switch Outputs . The radio signal transmitted from this wireless transmitter 1 is transmitted to wireless receiving units 20, 21.2.
2 are simultaneously received and demodulated, and each outputs a low-frequency demodulated signal containing unique data. These wireless receiving units 20, 21 . 22 is wired-OR connected (corresponding to claim a) i5 to the relay unit 3 by the signal line l.
(Although the wiring is not limited to this type of wiring, the signal line l may be connected in parallel from the relay unit 3 to each wireless receiving unit 20, 21, and 22.)
, the relay unit 3 includes each wireless receiving unit}20
, 21 and 22 is obtained, and this OR signal is transmitted to the display unit 4. The display unit 4 processes this OR signal and displays the data by lighting the display window 4a corresponding to the unique data. In addition, in this embodiment, the configuration is such that the wireless centralized transmitter 5 is modified (corresponding to Il requirement 2), and the display unit 4
It has multiple operation buttons 5a to 5h written with numbers corresponding to the eight window numbers, and by operating these operation buttons, a radio signal containing specific data for display is output. do. In addition, in this wireless Tokinaka transmission W6,
It is equipped with a light-on/off switch (not shown), and when switched to the light-on mode, the corresponding display g4a on the display unit 4 is lit by operating the operation buttons 5a to 5h, but when switched to the light-off side, the corresponding display g4a... It has the ability to turn off the corresponding display !!4&... by operating the buttons 5&~5h.Therefore, in restaurants etc., wireless transmitters H1... are installed on each table and the wireless central transmitter 5 is turned off. By installing it in a cooking tomb, etc., it is possible for children to have a configuration in which the display turns off when the order for the called table is completed.Next, Fig. 2 shows the main parts of the system of the present invention. The configuration is shown in a block diagram, with each wireless receiving unit 20,
21.22 are antennas 20a to 22 that receive radio signals
a, and front ends 20b to 22b that output a low frequency demodulated signal containing unique data from the received radio signal.
and amplifying circuits 20c to 22c that amplify the demodulated signals, and the demodulated signals outputted from the amplifier circuits 20c to 22c are output as a signal txt through an oven collector configuration made up of transistors Q1 to Q3. are doing.
On the other hand, in the relay unit 3 connected via the signal H1, the input terminal is pulled up by the resistor R and is amplified! !
Since the input terminal of AMP and the signal line l are connected to form a wired-OR connection, the amplifier AMP connects the transistor Q of the wireless receiving unit 20, 21, 22.
The logical sum inertia of l to Q3 is output. This OR signal is then transmitted to the signal processing circuit 4a of the display unit 4, where signal processing is performed, and the display means 4b displays the display window 4& corresponding to the unique data. Note that in this embodiment, a radio signal is transmitted from the wireless transmitter 1,
When signal processing is performed in the signal processing circuit 4a of the display unit 4, a notification signal is output from the signal processing circuit 4a to the notification sound sounding means 3a of the relay unit 3, so that a notification sound is generated. Although not shown in the figure, power is supplied from the AM source circuit provided in the relay unit 3 to each of the receiving units 20, 2l, and 22. Therefore, the 3rd TI! As shown in U, for example, even if the level of the radio wave signal reaching the wireless receiving unit 21, 22 is low and the demodulated signal is lost (see Fig. 3(c) and (d) N), If the level of the radio wave signal reaching the wireless receiving unit 20 is high, a normal demodulated signal (vi rational sum signal) is transmitted to the display unit 4, so that signal processing can be performed (see Fig. 3 (a)
), (b), (e)#[). That is, in the present invention, the wireless receiving units 20, 2
Since signal processing is performed using the logical sum signal of the low frequency signals received and demodulated in 1.22, the problem that would occur when adding an antenna and combining at high frequency is solved, and the number of installed wireless receiving units 20 (21.22) is reduced. By simply increasing the numbers and connecting them across the network, it is possible to easily expand the reception area, making it easy to design a system according to the area of a store, etc. In the above explanation of the wired-OR connection, the explanation is based on the combination of the NPN type transistors Q1 to Q3 whose emitters are grounded and the amplification tlAMP whose human power terminal is pulled up by the resistor R. It is not limited to this, but it is also possible to configure it with a PNP type transistor whose emitter side is FfI connected to the power supply voltage, and an amplifier whose human power terminal is grounded with a resistor.Furthermore, it is also possible to configure it with a PNP type transistor whose emitter side is FfI connected to the power supply voltage, and an amplifier whose human power terminal is grounded with a resistor. It is also possible to provide a configuration in which a logical sum circuit having the same number of input terminals as the wireless receiving units is provided in the wireless receiving unit 3 to output the logical sum signal of each wireless receiving unit to the signal processing circuit 3a. [Effects of the Invention] According to the present invention as set forth in claim 1, a Wi-line signal from a wireless transmitter is received and demodulated by a plurality of wireless receiving units and converted into a low frequency demodulated signal, and the logic of the demodulated signal is Since signal processing is performed using the sum signal, there are no problems caused by high frequency synthesis, and the reception area can be easily expanded by simply adding more wireless reception units, making system design easier and providing improved reliability for wireless calling. Display system can be provided. According to the present invention as set forth in claim 2, by providing a wireless centralized transmitter, the utilization of the system can be improved! It is possible to provide a wireless call display system with a wider range of applications. Further, according to the present invention as set forth in claim 3, zero feathering can be effectively performed with a simple configuration using a wired-OR connection. 4. Brief explanation of drawings No. 11! I is a system configuration diagram of the present invention, Fig. 2 is an explanatory diagram of wired-OR connection, Figs. 31 and 3 are waveform diagrams that clarify its operation, and Fig. 41! I is the main part configuration diagram of the conventional system,
Figure 4a is a configuration diagram when an external antenna is connected to the system. [Explanation of symbols] 1...Wireless transmitter la, 5a to 6h...Operation button 3・●・Relay unit 4・◆・Display unit 4a...Display window 5...Wireless centralized transmitter 20. 21.22...Wireless receiving unit representative Patent attorney Hiroyuki Nakai

Claims (3)

[Claims] (1) A plurality of wireless transmitters that transmit wireless signals containing unique data for display in accordance with the operation of operation buttons; and a plurality of wireless transmitters that receive and demodulate the wireless signals transmitted from the wireless transmitters to display the unique data. at least one wireless receiving unit that outputs a demodulated signal including the above; a relay unit that simultaneously receives the demodulated signals output from each of the wireless receiving units and obtains a logical OR signal of these demodulated signals; and a plurality of display windows. and a display unit that processes the OR signal output from the relay unit and displays it on a display window corresponding to the unique data. . (2) A claim characterized in that the device further includes a wireless centralized transmitter that has a plurality of operation buttons and that transmits a wireless signal that includes unique data for display corresponding to these operation buttons. 1. The wireless call display system according to 1. (3) The relay unit and each of the wireless receiving units are wired-OR connected, so that the relay unit obtains the OR signal of the demodulated signals output from each of the wireless receiving units. A wireless call display system according to claim 1, characterized in that: