JPH0147960B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a reception display system. An object of the present invention is to make it possible to reliably determine which transmitting unit is used to display a message, to confirm that the message has been used, and to reduce electricity costs. A transmission unit is installed at each table in the cafeteria, etc.
In a reception display system in which a reception unit is provided in the counter section and each transmission unit emits a unique and identifiable radio wave, and the reception unit receives and displays the radio waves, the display section of the reception unit operates and continues. If it is displayed as
If a large number of indications are given, identification may be mistaken. Therefore, even if the display section is activated once, it is necessary to reset it, but if the display section is automatically reset, there is a risk of omission of confirmation, and it is necessary to reset it from the transmitting unit side. There is a risk that it will be reset by accident. The present invention has been made in view of this point, and will be explained in detail below with reference to Examples. In Figure 1, 1 ₁ and 1 ₂ are transmitting units;
Radio waves unique to each transmitting unit are emitted from a plurality of locations, and these radio waves are received by a receiving unit 2, and a channel is displayed on a display section 3 of the receiving unit 2. 4 is the channel setting section,
5 is a display mode changeover switch. 6 is a reset unit that resets the display on the display section 3 by operating a reset button 7;
Although the reset system shown in FIG. 1 is reset using radio waves, a wired reset system may be used by connecting the receiving unit 2 and the reset unit 6. FIG. 2 shows a circuit diagram of the transmitting units 1 ₁ and 1 ₂ , in which the channel setting section 8 is formed by something like a pin board, and the modulation section is formed by an arithmetic processing LSI such as a microcomputer. A wave generating circuit 9, a reference signal generating circuit 10 with an oscillation frequency of about 300 KHz that supplies a reference clock signal to the modulated wave generating circuit 9, a carrier wave generating circuit 11 having an oscillating frequency of about 300 KHz, and a carrier wave generating circuit 11 with an oscillating frequency of about 300 KHz. The modulating circuit 12 is connected in series and is controlled by the output of the modulated wave generating circuit 9. Therefore, the modulated wave generation circuit 9
are connected to the respective terminals in the 4th row and 6th column of the channel setting section 8, and each of the 4th row of the channel setting section 8 selects each modulation frequency, and each of the 6th column selects each timing in time series. The output of the modulated wave generation circuit 9 sequentially specifies the readout timing of each of the six columns, and the channel set row in the specified column (that is, the modulation frequency to be generated at that timing) is specified. The reference clock signal output from the reference signal generating circuit 10 is frequency-divided based on the read data signal to output a predetermined modulated frequency signal. The modulated frequency signal, which is obtained as the output of the modulated wave generation circuit 9 and which changes moment by moment at each time point in the time series, is input to the modulation circuit 12, and the 300MHz carrier wave generated by the carrier wave generation circuit 11 is It is modulated by a modulation frequency signal obtained by combining and arranging six modulation frequencies in time series, and is emitted into space from an antenna that also serves as the oscillation coil 13. Therefore, as shown in Figure 3, the transmitted radio waves are sent as signals modulated at one of the four modulation frequencies at each of the first to sixth time timings in the time series. It is. FIG. 4 shows a circuit block diagram of the receiving unit 2, which includes, for example, a front end 14 composed of a super regenerative circuit including two transistors,
A gain amplifier 15 whose gain is set to about 80 dB,
Four band-pass type filter circuits 16 ₁ ... 16 4 whose center frequencies are set to f ₁ to f ₄ respectively, and comparators 17 ₁ ... _{17 4 that} respectively discriminate the outputs of these filter circuits 16 ₁ ... 16 ₄ . , a channel setting unit 4 formed of something like a pin board, and a channel determination unit formed of an arithmetic processing LSI such as a microcomputer and inputting the outputs of the _four groups of comparators 17 ₁ ... 17 and the output of the channel setting unit 4. The channel discrimination circuit 18 stores the input signal in an internal memory, compares it with the self-set channel, and if they match, outputs a strobe signal and generates a notification sound via the monostable oscillator 19. A channel match signal is provided to circuit 20. However, the self-setting channel has a part in an internal circuit, thereby changing the output state (output to the binary decimal evolution decoder 21). In Fig. 4, the information processing functions of _S5 and _S6 are internally included. 21 is binary 10
An evolution decoder, 22 is an R/S latch, 23 is an output state changing circuit, and 24 is a driver circuit, these are outputs from the channel discrimination circuit 18 and displayed on the display section 3.
The display elements 25 ₁ , 25 ₂ . It can be changed like C. The channel setting section 8 of the transmitting units 1 ₁ and 1 ₂ has 1 circuit 4 contact switches S ₁ to S ₅ and 1 as shown in FIG.
The circuit consists of a two-contact switch _S6 . here,
If we take out only the switches S ₅ and S ₆ and look at the code signal of the modulated wave generation circuit 9, we get the following.

[Table] Here, since Switch S ₆ uses a 1-circuit 2-contact switch as described above, the code signal
0000, 0010, 0100, ...1110 can be obtained and can be used as a set signal, but 0001, 0011, 0101,
... Since 1111 cannot be obtained, this signal is used as a reset signal for the receiving unit 2. That is, the 16 channel signals from 0000 to 1111 obtained from the channel discrimination circuit 18 of the receiving unit 2 as shown in FIG. In this way, the code signals 0000, 0010, 0100...1110 can be used as set signals, and the code signals 0001, 0011, 0101...1111 can be used as reset signals. Therefore, by switching the display mode changeover switch 15 to the R/S latch C, if the above-mentioned channel code signal is applied wirelessly or wired from the reset unit 16 to the channel discrimination circuit 18, it will be set in the transmitting units 1 ₁ and 1 ₂ . You can reset the displayed channels. As shown in FIG. 5, five switches with one circuit and four contacts and one switch with two contacts and one circuit constitute the setting means and the reset means. The bit data of _S6 as a reset signal is used in the opposite manner to the set signal of the setting means. Here, in the set means and reset means, five switches S ₁ to S ₅ of one circuit and four contacts are assigned to each channel, and as shown in FIG. 3, for example, switches S ₁ to _{S 5} are assigned to channels. f ₂ , f ₁ , f ₃ , f ₄ , f ₂
It is set to . The switch _S6 is then set in response to the set signal or reset signal. That is, if it is a set signal, the part _S6 is f1 _{or f3} , as is clear from FIG. 5, and if it is a reset signal, it is _f2 or _f4 . Now, the modulated carrier signal received by the receiving antenna 26 is amplified and demodulated by the front end 14,
Each filter circuit 16 ₁ via the gain amplifier 15
...16 Input in parallel to ₄ . Filter circuit 16 ₁
... ₁₆₄ corresponds to each of the four modulation frequencies _f1 ... _f4 , outputs are produced from the filter circuits ₁₆₁ ... ₁₆₄ that match the frequency of the demodulated signal received at that time, and the comparators ₁₇₁ ... 17 ₄ , it is determined whether or not an output has occurred in each corresponding filter circuit 16 ₁ ... 16 _4. Therefore, depending on the frequency of the demodulated signal received at that time, one of the comparators 17
Output is generated at ₁ ...17 ₄ and the channel discrimination circuit 18
will be entered into. Channel discrimination circuit 1
8 inputs each output of the comparators 17 ₁ ... 17 ₄ as described above, and sequentially specifies signals to the pinboard matrix of the channel setting section 4, starting from the row where the channel setting in the specified column is performed. It is configured to read the output of
First, if an output is generated in any of the comparators 17 ₁ ... 17 ₄ due to the first demodulated signal in the time series, then the comparator 17 that generated this output
₁ ...17 Number ₄ and number 1 as the first in the time series
When the column read command signal is given to the channel setting section 4, the channel discriminating circuit 18 compares and discriminates the row number for which the channel is set in the first column, which is read into the channel discriminating circuit 18, and if they match. While waiting for the comparators 17 ₁ ... 17 ₄ to be activated by the next second demodulated signal, a read command signal for the second column is given to the channel setting section 4, and an output is also generated at this second time timing. Comparator 17 ₁ ...17 ₄
If the number matches the number of the channel-set row in the second column, the third reception waiting state is entered in the same manner. In this way, the numbers of the activated comparators 17 ₁ ... 17 ₄ at the first to sixth time timings are set as channels in the first to fourth columns of the channel setting section 4 and inside the channel discrimination circuit 18, respectively. When all row numbers match, receiving unit 2
It is determined that the channel of
₁ , 25 ₂ . . . 25N is lit to display the channel. If this display is to be reset, it can be reset by operating the reset button 7 of the reset unit 6 as described above. As described above, the present invention makes it possible to reset the channel display displayed by the receiving unit using the reset unit, so that it is possible to reliably determine which transmitting unit has displayed the channel, and it is also possible to confirm that the channel has been used, and to eliminate unnecessary displays. This has the effect of reducing electricity costs since it does not cause any damage. Further, the above-mentioned setting means is constituted by a plurality of switches each having four contacts in one circuit for creating an identifiable data signal and one switch having two contacts in one circuit for creating a set signal, and the set means is configured to create an identifiable data signal and set it. The above-mentioned reset means is constituted by the same number of switches having four contacts per circuit as the means, and one switch having two contacts per circuit which forms bit data inversely to the reset signal from the reset signal. from,
It is possible to clearly distinguish between a set signal and a reset signal, and in particular, the reset signal is not sent from the transmitting unit and cannot be reset due to mischief, etc., and the reset signal is different from the set signal when it is bit data. Since these are reversed, the set signal and the reset signal can be used in correspondence, and the set means and reset means can be formed with the same type of switch configuration, so the number of types of parts used does not increase. Further, it is possible to easily configure the setting means and the reset means.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the reception display system of the present invention, and FIG. 2 is a circuit diagram of the same transmitting unit.
Figure 3 is a waveform diagram of the transmitting signal as above, Figure 4 is a block circuit diagram of the receiving unit as above, Figure 5 is a configuration diagram of the channel setting section of the transmitting unit as above, and Figure 6 is a diagram of the channel setting section of the transmitting unit as above.
The figure is a circuit diagram of the main part of the receiving unit same as above. 1 ₁ , 1 ₂ ... transmitting unit, 2 ... receiving unit,
3...Display section, 6 is a reset unit.

Claims (1)

[Claims] 1. In a reception display system that receives and displays radio waves emitted from a transmitting unit that emits radio waves unique to each location from multiple locations, the transmitting unit is provided with a setting means for channel display, and the reset unit is provided with the above-mentioned A reset means is provided to enable the channel display to be reset by the set means, and includes a plurality of switches each having four contacts per circuit for creating the above-mentioned identifiable data signal, and one switch having two contacts per circuit for creating the set signal. The above-mentioned set means is constructed by creating an identifiable data signal, and generates a reset signal by using the same number of switches having four contacts per circuit as the switches having four contacts per circuit of the setting means. A reception display system characterized in that said reset means is constituted by one switch of two circuit contacts.