JP2700690B2 - Wireless call display system - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to improvements in wireless call display systems.

[Related Art] Recently, a large number of large-scale restaurants and the like have been established, and in these restaurants and the like, a wireless call display system has been increasingly used in order to provide quick service.

In such a wireless call display system, when a customer operates an operation button of a wireless transmitter attached to each table, a wireless signal is output, and the wireless signal is received and demodulated by a wireless receiver, and a customer service such as a waitress is received. The display unit attached at a position where the user can easily see the numbers is used to display numbers, thereby providing quick service.

FIG. 4 shows a wireless receiver 100 used in such a system configured using radio signals and a display unit 200 having a plurality of display windows 200a. The receiver receives and demodulates a radio signal including unique data for display output from a wireless transmitter equipped with the antenna 100a, and performs signal processing on the demodulated signal to display the signal corresponding to the unique data of the wireless transmitter. A control signal is output to the display unit 200, and one of the display windows 200a... Corresponding to the unique data is turned on.

However, the wireless transmitter and wireless receiver 100
When the distance from the wireless transmitter is large, or when it is obstructed by a wall and the visibility is poor, the radio signal from the wireless transmitter is attenuated. No control can be performed.

As a countermeasure against this, as shown in FIG. 4a, the antenna extension terminal (not shown) of the wireless receiver 100 is connected to the antenna 100.
An external antenna 100b having a higher gain than a is added to cope with the problem.

However, in such a measure, the external antenna 10
Since the antenna has directivity in order to increase the gain of 0b, the receiving area is reduced and the two antennas 100a, 1
00b is connected to the wireless receiver 100 in parallel,
It becomes difficult to match high-frequency impedance without attenuation on the wireless receiver 100 side. Also the antenna
Due to factors such as the installation interval between the 100a and the external antenna 100b (with respect to the wavelength of the radio wave used) and the direction of arrival of the radio signal, null points occur such that the signals received by both antennas 100a and 100b cancel each other. There is a need for improvement.

[Problems to be Solved by the Invention] The present invention proposed in view of the above situation is to perform signal processing by using a logical sum signal of demodulated signals individually received and demodulated by a plurality of wireless receiving units, so that any It is an object of the present invention to provide a wireless call display system in which a display can be performed if reception and demodulation is reliably performed by a wireless reception unit, a reception area can be easily enlarged, and a system design is easy.

[Means for Solving the Problems] The present invention according to claim 1 proposed to achieve the above object transmits a wireless signal including unique data for display in response to operation of an operation button. A plurality of wireless transmitters, a plurality of wireless transmitters connected to each other by a common signal line, each receiving and demodulating a radio signal transmitted from the wireless transmitter, and outputting a demodulated signal including the unique data; The receiving unit and the plurality of wireless receiving units are wired-OR connected to the common signal line, receive demodulated signals output from the respective wireless receiving units simultaneously through the common signal line, and receive the demodulated signals. A relay unit for obtaining a logical sum,
A display unit that has a plurality of display windows and performs signal processing on a logical sum signal output from the relay unit to display a signal on the display window corresponding to the unique data.

The present invention according to claim 2 further includes a wireless centralized transmitter having a plurality of operation buttons and transmitting a radio signal including unique data for display corresponding to the operation buttons. ing.

[Operation] According to the first aspect of the present invention, when the operation button of the wireless transmitter is operated, a wireless signal including unique data for display is output. The wireless signal is received and demodulated by a plurality of wireless receiving units at the same time, and then transmitted to a relay unit through a common signal line l connecting these receiving units in a wired-OR manner. In the relay unit,
The display unit is transmitted by obtaining a logical sum signal of these demodulated signals, and the display unit performs signal processing on the logical sum signal and displays the signal on a display window corresponding to the unique data.

According to the second aspect of the present invention, when any one of the plurality of operation buttons of the centralized wireless transmitter is operated, unique data for display set corresponding to the operation button is displayed. Outputs the wireless signal including the signal.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a wireless call display system according to the present invention. In the figure, reference numeral 1 denotes a wireless transmitter having an operation button 1a, inside which a display number setting switch (not shown) for setting a display number is provided. Setting numbers 1 to 8 are provided corresponding to the number of display windows 4a of the unit 4). When the operation button 1a is operated, a high-frequency radio signal including unique data set by the display number setting switch is transmitted. Output. Radio signals transmitted from the wireless transmitter 1 are simultaneously received and demodulated by the wireless receiving units 20, 21, and 22, and output low-frequency demodulated signals including unique data. The wireless receiving units 20, 21, and 22 are cross-connected by a common signal line, and are further wired-OR connected to the common signal line. Therefore, a logical sum signal of the demodulated signals output from the wireless receiving units 20, 21, and 22 is obtained in the relay unit 3, and the logical sum signal is transmitted to the display unit 4. In the display unit 4,
The logical sum signal is processed, and the display window 4a corresponding to the unique data is turned on to perform display.

Further, in the present embodiment, the wireless centralized transmitter 5 is provided (corresponding to claim 2), and the display unit 4 is provided.
Operation buttons with numbers corresponding to the eight window numbers
5a to 5h. By operating these operation buttons, a radio signal including unique data for display is output. The wireless centralized transmitter 5 is provided with an on / off switch (not shown). When the switch is turned on, the operation of the operation buttons 5a to 5h causes the display unit 4 to operate.
Has a function of turning off the corresponding display window 4a by operating the operation buttons 5a to 5h when the display window 4a is turned off. Therefore, in a restaurant or the like, the wireless transmitters 1 are installed at each table and the wireless centralized transmitter 5 is installed at a cooking place or the like, so that the display is turned off when the order of the called table is completed. It is also possible to adopt such a configuration.

Next, FIG. 2 is a block diagram showing a main part configuration of the system of the present invention.
Reference numerals 1 and 22 denote antennas 20a to 22a that receive radio signals, front ends 20b to 22b that output low-frequency demodulated signals including unique data from the received radio signals, and amplifier circuits 20c to 20 that amplify the demodulated signals. 22c and this amplification circuit
Demodulated signals output from 20c to 22c are
The signal is output to the signal line 1 by the open collector configuration by Q3. On the other hand, in the relay unit 3 connected via the signal line l, the input terminal of the amplifier AMP whose input terminal is pulled up by the resistor R is connected to the signal line l to form a wired OR connection. From the amplifier AMP, the transistors Q1 to Q3 of the wireless receiving units 20, 21, 22
Is output. Then, the OR signal is transmitted to the signal processing circuit 4a of the display unit 4, where the signal processing is performed, and the display means 4b displays the display window 4a corresponding to the unique data. In this embodiment, a radio signal is transmitted from the wireless transmitter 1 and the display unit 4
When signal processing is performed by the signal processing circuit 4a, a notification signal is output from the signal processing circuit 4a to the notification sound sounding means 3a of the relay unit 3 to sound a notification sound.

Although not shown, power is supplied from the power supply circuit provided in the relay unit 3 to each of the receiving units 20, 21, and 22.

Therefore, as shown in FIG. 3, for example, even when the radio signal level reaching the wireless receiving units 21 and 22 is low and the demodulated signal is lost (FIGS. 3C and 3D). If the level of the radio signal reaching the wireless receiving unit, for example, 20, is high, a normal demodulated signal (logical sum signal) is transmitted to the display unit 4, so that signal processing can be performed (see FIG. 4). (See FIGS. 3 (a), (b) and (c)).

That is, in the present invention, the wireless receiving units 20, 21,
Since the signal processing is performed by the logical sum signal of the low-frequency signal received and demodulated in 22, the problem that occurs when the antenna is added and combined at a high frequency is solved, and the number of wireless receiving units 20 (21, 22) is increased. By simply connecting over the network, the reception area can be easily expanded, and the system can be easily designed according to the area of the store or the like.

In the above description of the wired-OR connection, a combination of NPN-type transistors Q1 to Q3 whose emitter side is grounded and an amplifier AMP whose input terminal is pulled up by a resistor R is described. The present invention is not limited to this. It is also possible to use a PNP transistor whose emitter is connected to a power supply voltage and an amplifier whose input terminal is grounded by a resistor.

[Effects of the Invention] According to the present invention, wireless signals from a wireless transmitter are connected across a common signal line, and are simultaneously connected by a plurality of wireless receiving units wired or connected to this signal line. Reception demodulation converts the signal to a low-frequency demodulated signal, and signals the logical sum of the demodulated signal.This eliminates the problem of high-frequency synthesis as in the case of adding multiple antennas. Since the reception area can be easily expanded simply by connecting over the line and adding, a wireless call display system with easy system design and improved reliability can be provided.

According to the second aspect of the present invention, it is possible to provide a wireless call display system in which the use range of the system is further expanded by including the wireless centralized transmitter.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of the present invention, FIG. 2 is an explanatory diagram of wired-OR connection, FIG. 3 is a waveform diagram for explaining the operation thereof, FIG. 4 is a main portion configuration diagram of a conventional system, FIG. Is a configuration diagram when an external antenna is connected to the system. [Explanation of Signs] 1 Wireless transmitter 1a, 5a to 5h Operation button 3 Relay unit 4 Display unit 4a Display window 5 Wireless centralized transmitter 20,21,22 Wireless Receiving unit

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoichi Isobe 1048 Okadoma Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References JP-A-62-194599 (JP, A) JP-A-63-31320 (JP, A)

Claims (2)

(57) [Claims] 1. A plurality of wireless transmitters for transmitting a radio signal including unique data for display in accordance with an operation of an operation button, and are connected to each other by a common signal line.
A plurality of wireless receiving units wired or connected to the common signal line, each receiving and demodulating a wireless signal transmitted from the wireless transmitter, and outputting a demodulated signal including the unique data; Is connected to the wireless receiving unit by the common signal line, and simultaneously receives demodulated signals output from the respective wireless receiving units through the common signal line to obtain a logical sum signal of these demodulated signals. A wireless call display having a unit, and a display unit having a plurality of display windows, and performing a signal processing on a logical sum signal output from the relay unit to display a signal on a display window corresponding to the unique data; system. 2. A wireless central transmitter having a plurality of operation buttons and transmitting a radio signal including unique data for display corresponding to these operation buttons, is further provided. The wireless call display system according to claim 1.