JP2576582B2 - Transmission device and communication method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a communication system including a plurality of transmitting devices and one receiving device, which is used to mix transmission signals transmitted from a plurality of transmitting devices. The present invention relates to a transmitting device that suppresses as much as possible and a communication system using the transmitting device.

[Prior Art] As shown in FIG. 1, when one receiving apparatus 1 processes transmission signals 2a, 3a, 4a from a plurality of transmitting apparatuses 2, 3, 4, the transmitting apparatuses 2, 3, 4 Because of the large number of transmitters 4, it is necessary to make the transmitter side as simple as possible. Generally, each transmitter 2, 3, 4 has the same transmission function (ie, the same carrier frequency,
(The same modulation method, the same data format, etc.).

Further, if the transmitting devices 2 and 3 exist in the receiving area 5 of the receiving device 1, there is a possibility that transmission signals from the transmitting devices 2 and 3 are superimposed and cause interference. In order to prevent interference, for example, it is conceivable to provide a receiving circuit for receiving a signal from the receiving device 1 in the plurality of transmitting devices 2 and 3 and control the transmission state of the transmitting devices 2 and 3 from the receiving device 1 side. However, the transmission devices 2 and 3
Providing a receiver circuit in the above is not desirable because it increases the cost and the size of the apparatus.

Therefore, conventionally, transmission from a plurality of transmitting devices 2 and 3 is performed at a predetermined time interval that is the same time interval, and interference is prevented by shifting the transmission timing of a transmission signal in each transmitting device 2 and 3.

[Problems to be solved by the invention]

However, even in the above-mentioned conventional device, each transmitting device
To shift the transmission timing of 2, 3
In order to determine the transmission time, some processing (or device) is required. In such a device, transmission is performed at predetermined time intervals. Occurs, the state of interference continues to be maintained even after that, and the transmitting device 1 continues to be unable to receive a transmission signal for a long time, which is very inconvenient in use.

Therefore, the present invention has been made in view of the above-described problems, and an object of the present invention is to reduce the frequency of interference of a transmission signal without making the apparatus any complicated structure, and to reduce the driving power supply between each transmission apparatus. The purpose is to reduce variations in the consumption state.

[Means for solving the problem]

In order to achieve the above object, a transmitting apparatus of the present invention comprises: data setting means for setting data to be transmitted; transmission interval determining means for determining a transmission time interval according to the content of the data; Transmitting means for transmitting the transmitted signal at the transmission time interval, transmitting the transmission signal at a predetermined time interval different from the transmission time interval, and transmitting the transmission signal within the predetermined time interval. Transmission is performed a predetermined number of times at the transmission time interval.

Further, the communication method of the present invention includes a plurality of transmitting devices and one receiving device, each of the plurality of transmitting devices having the same transmitting function, and having a transmission time interval corresponding to the content of data to be transmitted. The transmitting device transmits the transmitting signal, and the receiving device can receive the transmitting signal in the same process with respect to the plurality of transmitting devices, and further, the plurality of transmitting devices have a predetermined time different from the transmission time interval. While transmitting the transmission signal at intervals, the transmission signal is transmitted a predetermined number of times at the transmission time interval within the predetermined time interval, and the predetermined time interval and the predetermined number of times are transmitted to the plurality of transmission devices. It is assumed that they are set to the same value.

[Action]

According to the configuration of the present invention, the transmission device determines the transmission time interval of the transmission signal according to the content of the data. Therefore, even if interference occurs, if the data content of the transmission signal is different, the next time. Does not cause continuous interference.

In addition, in each transmitting device, the transmission signal is transmitted at a predetermined time interval different from the transmission time interval, and the transmission signal is transmitted a predetermined number of times at the transmission time interval within the predetermined time interval. Therefore, the power consumption of each transmitting device within the predetermined time interval is the same, and the variation in the consumption state can be reduced as a whole.

〔Example〕

 Hereinafter, the present invention will be described using embodiments shown in the drawings.

A first embodiment of the present invention will be described with reference to FIGS. The present embodiment is also a communication system in which a single receiving device 1 processes transmission signals 2a, 3a, 4a from a plurality of transmitting devices 2, 3, 4 and, in particular, the transmitting device 2, 3, 4 side. There is a feature. FIG. 2 is a configuration diagram showing the transmission devices 2, 3, and 4, which are realized by a semiconductor integrated circuit or the like and are configured on, for example, one semiconductor substrate. In the figure, reference numeral 6 denotes a transmitting device, and reference numeral 7 denotes a generally known transmitting circuit, which includes, for example, a crystal oscillation circuit, a modulation circuit, a control circuit, and the like. Reference numeral 8 denotes a data memory for storing contents to be transmitted.
It is composed of a RAM, a ROM, a shift register and the like, and its data is serially applied to a modulation input of the transmission circuit 7. Reference numeral 9 denotes a timer having a configuration preset by a signal supplied from the data memory 8, and its output is supplied to a control input of the transmission circuit 8.

In the above configuration, the data (for example, the code of the transmission device 6) initially given from the outside and / or the data (for example, the message) inputted as needed from the outside to the transmission device 6 are temporarily stored in the temporary data memory 8 for transmission. Is stored in
The data is output as serial data and input to the modulation terminal of the transmission circuit 7. On the other hand, the output of the timer 9 which is variable according to the contents of the data memory 8 is input to the carrier control terminal of the transmission circuit 7.

Therefore, the serial data is subjected to modulation processing such as amplitude modulation (AM), frequency modulation (FM), or phase modulation (PM) by the transmission circuit 7, and the modulated wave is transmitted at the transmission time interval set by the timer 9. Sent. Each transmission device
2, 3, and 4 have the same transmission function of the same carrier frequency, the same modulation method, the same data format, and the like, and can be formed in the same configuration without requiring a special circuit or the like.

FIG. 3 shows transmission signals from such transmitting devices 2 and 3, and the upper part is a graph showing the operating state of the transmitting device 2,
The lower part is a graph showing the operation state of the transmitting device 3, and the time axis on the horizontal axis is common. As shown in the figure, if the contents of data 1 and data 2 are different, the transmission time intervals t ₁ and t ₂ are also set to different values, so that even if interference occurs once, the transmission signal from the next time continues. Never do.

In FIG. 1, the configuration of the receiving device 1 can adopt a commonly used configuration. For example, as shown in FIG. 4, a transmission signal received from an antenna is mixed with a mixer 1a.
The signal is mixed with the oscillating wave from the oscillator 1b by the mixer 1a and frequency-converted to an intermediate frequency band in order to increase the receiving sensitivity. Thereafter, demodulation is performed by the demodulation circuit 1c, and the obtained data is stored in a memory such as the controller 1d and used for various controls.

FIG. 5 is an electric circuit diagram which embodies the transmitting device 6 of FIG. In the figure, reference numerals 10 to 13 denote RAMs (random access memories) for storing data to be transmitted. In this embodiment, SRAMs (Static RAMs) are employed. The output is input to a shift register 14 and a PLA (programmable logic array) 15. However, a circuit for writing data to the RAMs 10 to 13 is omitted in FIG. 14 is a shift register, which is a parallel input
In response to D ₀ to D ₃ and the operation clock CLK, a serial output SO
Is given to the transmission circuit 17. Reference numeral 15 denotes a PLA, which includes NchMOS transistors 24 arranged in a cell and a pre-jersey.
It comprises a PchMOS transistor 25 and an inverter 26 for extracting an output. Note that an NchMOS transistor 24 is formed at a position indicated by a circle at the intersection of each wiring in the drawing. Reference numeral 16 denotes a generally known up counter circuit, which receives an output of the frequency dividing circuit 29 and performs a counting operation. Output Q ₀ , ▲ ▼,
…… Q ₃ , ▲ ▼, …… are connected to PLA15. R is a reset terminal. Reference numeral 17 denotes a transmission circuit, and a terminal DATA for inputting data to be transmitted is connected to the shift register 14.
Further, a controller terminal for permitting transmission is connected to the output of the flip-flop 18, and a terminal E for outputting a signal indicating the completion of transmission is connected to the reset input of the flip-flop 18, respectively. Here, 20 and 21 are RAM10 ~
An NchMOS transistor for constituting 13; inverters 22, 23; inverters 27, 28 for NOR gates constituting a flip-flop 18;
Is divided and given to the up counter 16.
Φα and φβ are non-overlapping two-phase clocks, CLK is the basic clock of the timer, and LD is the RAM 10-13.
Is a signal for accessing. In this circuit, the RAMs 10 to 13 and the shift register 14 correspond to the data memory 8 in FIG. 2, and the PLA 15 and the up counter 16 correspond to the timer 9.

In the above-described circuit configuration, considering that, for example, (D ₀ , D ₁ , D ₂ , D ₃ ) = ( ₁ , ₀ , ₀ , ₁ ) is stored in the RAMs 10 to 13 as data to be transmitted, the up counter 16 When the output of (Q ₀ , Q ₁ , Q ₂ , Q ₃ ) = ( ₁ , ₀ , ₀ , ₁ ), all the NchMOS transistors 24 connected to the wiring of the PLA 15 indicated by the arrow in the drawing are turned on. Pc to become
Since the electric charge precharged by the hMOS transistor 25 is discharged to the ground, the output of the inverter 26 becomes H (high) level, and the flip-flop 18 is set and the up-counter 16 is reset at the same time. When the flip-flop 18 is set, the carrier of the transmitting circuit 17 oscillates, and the shift register
The modulated wave 17a is modulated by the content (modulation signal) of the serial output SO output from 14 and output as a transmission signal. Here, the output of the up counter 16 becomes (Q ₀ , Q ₁ , Q ₂ , Q ₃ ) = ( ₁ , ₀ , ₀ , ₁ ) if the frequency dividing circuit 29 is, for example, an 8 frequency dividing circuit. For example, t ₁ = 75t (where t is the cycle time of the basic clock CLK). That is, according to the present circuit configuration, the transmission time interval is set by the time counted from when the up-counter 16 is reset until the value becomes equal to the data stored in the RAM 10. The transmission is completed by outputting a signal from the terminal E after a timer time set by the transmission circuit 17 to reset the flip-flop 18 and stop the oscillation of the carrier.

Next, considering the case where the storage contents of the RAMs 10 to 13 are different from the above contents, (D ₀ , D ₁ , D ₂ , D ₃ ) = (0,1,0,0), The transmission time interval is t ₂ = 16t, which is shorter than t ₁ . Therefore, according to the present embodiment, the time until the H-level signal is output from the inverter 26, that is, the transmission time interval is determined according to the data to be transmitted, that is, the contents stored in the RAMs 10 to 13.

As described above, according to the transmission device of the present embodiment, transmission signals are transmitted at transmission time intervals according to the content of data to be transmitted, so that communication is performed using a plurality of the transmission devices. In this case, even if interference occurs once, if the data content of the transmission signal is different, the transmission signal from the next time does not continuously interfere, and the interference frequency can be reduced. Also, for this purpose, each transmission device does not require a special configuration, and a plurality of transmission devices may have a common configuration, so that a relatively simple configuration can be achieved, and furthermore, it can be manufactured at low cost. This is also advantageous.

In the present embodiment, as data to be transmitted, for example, when a code of the transmission device attached to each transmission device is also transmitted, if the transmission device is different, the transmission data is always different, so that the transmission time interval is different. The receiving device can surely recognize which transmitting device the signal is transmitted from. In this case, for example, in the circuit shown in FIG. 5, any one of the RAMs 10 to 13 may be fixed as the code data of the transmitting device and the storage content thereof may be fixed. or,
In FIG. 5, an E ² PROM or the like may be used instead of the RAMs 10 to 13, and a microcomputer or the like may be used instead of the PLA 15.

Next, further characteristic portions of the present invention will be described with reference to FIGS. If the transmission time interval is determined according to the transmission data as described above, a difference occurs in the number of transmission signals transmitted within a predetermined time between the transmission devices. The driving power of the transmitting device is greatly influenced by the number of transmissions of the transmission signal. If the driving power of the transmitting device is a built-in type such as a battery, the driving power consumption state is significantly different between the transmitting devices. The inconvenience of being different occurs. The one shown in FIG. 6 solves such a disadvantage.

FIG. 6 shows a transmitting apparatus according to the present embodiment, in which 30 is an up counter, 31 is a decoding circuit composed of a PLA or the like, 32 is an oscillating circuit, 33 is a transmitting circuit, 34 is an OR gate, 35 Is a data memory for storing data to be transmitted. The up counter 30, the decoding circuit 31, the transmission circuit 33, and the data memory 35 have basically the same configurations as the up counter 16, the PLA 15, the transmission circuit 17, and the RAMs 10 to 13 (including the shift register 14) in FIG. Frequently, in this embodiment, a Q _{n + 1} output terminal is newly provided in the up counter 16,
The output is led to a reset (R) terminal and an OR gate 34. The transmitting device 33 has the same function as the flip-flop 18 in FIG.

According to the above circuit configuration, first consider similar to the circuit of Figure 5 described above, the data stored in the data memory 35, the value of the output signal by Q ₀ to Q _n of the up counter 30 becomes the same In this case, an H-level signal is output to the output line A, and the signal is input to the transmission circuit 33 via the OR gate 34, and the transmission signal is transmitted at that timing. Thereafter, the count of the up counter 30 proceeds, and when an overflow occurs in the Q _{n + 1} digit, an H level signal is output from the Q _{n + 1} output terminal to the output line B, and the up counter 30 is reset and OR is performed. The signal is input to the transmission circuit 33 via the gate 34, and the transmission signal is transmitted at that timing. After that, since the up-counter 30 is reset, the up-counter 30 counts up to the data value of the data memory 35 as described above.

FIG. 7 shows a transmission signal when the above circuit is applied to the transmission devices 2 and 3 in FIG. Even if the transmission signals A ₁ and A ₂ from the transmission devices 2 and 3 interfere at time T, the next transmission signals A ₂ and B ₂ are transmitted at the transmission time interval t according to the data stored in the data memory 35. _{Since 1} and t ₃ are determined, if the data is different, t ₁デ ー タ t ₃ and interference can be avoided.
Since the next transmission signals A ₃ and B ₃ are determined by the time until the overflow to the Q _{n + 1} digit, the transmission signals A ₃ and B ₃ are common to the transmission devices 2 and 3, and t ₁ + t ₂ = t ₃ + t ₄ holds. . That is, By performing communication that simultaneously satisfies the above expressions, there is no possibility that interference will continue, and (t ₁ +
Considering the period of t ₂ ), it is considered that data is transmitted at a constant period irrespective of the content of the data (that is, the average of the transmission time intervals is always (t ₁ + t ₂ ) / 2). The consumption of the driving power supply (battery or the like) can be made constant among the transmission devices regardless of the data content. Therefore, if communication is performed using such a transmission device, all of the built-in drive power supplies in a plurality of transmission devices can be replaced at the same timing, so that transmission becomes impossible due to insufficient power, and consequently reception becomes impossible. Can be avoided as much as possible. In order to further reduce the interference frequency in the above circuit configuration, the output signal of the up-counter 30 may be converted into an arbitrary value and the decode value of the decode circuit 31 may be plural.

Next, a second embodiment will be described with reference to FIG. 8 as another circuit having the same function as the circuit shown in FIG.

In the figure, 36 is a timer circuit for generating a square wave as shown at 37, 38 is a delay timer composed of a resistor 39, a capacitor 40, and a comparator 41, and 42 is a NO
A pulse synthesizing circuit composed of R gates 43 and 44, an AND gate 45, an OR gate 46, a resistor 47 and a capacitor 48, and 49 is a transmitting circuit. Reference numeral 50 denotes an output waveform of the pulse synthesis circuit 42.

According to the above circuit configuration, a periodic square wave like 37 is generated by the timer circuit 36, this is input as a set input of the flip-flop constituted by the NOR gates 43 and 44, and the output is an AND gate. The capacitor 40 is charged through the resistor 45 and the resistor 39, and the reference voltage Vref is charged by the comparator 41.
By inputting the output to the other input of the AND gate 45, the pulse of the transmission signal 2 having the output waveform 50 rises. The reset of the pulse of the transmission signal 2 is as follows.
This is done by the output of AND gate 45, which is delayed by charging capacitor 48 through resistor 47.
By these operations, a pulse of the transmission signal 2 is generated, and the OR
The transmission signal 49 together with the transmission signal 1 and the transmission signal 3 having the output waveform 50 is input to the transmission circuit 49 by the gate 46.

Here, for example, a switching element such as a MOS transistor is connected in series to the capacitor 40, and a plurality of such series circuits are prepared and connected in parallel. If the switching is performed so that the capacitance value changes, the circuit operation shown in FIG. 7 can be realized.

FIG. 9 is a diagram conceptually generalizing the technical ideas of the first and second embodiments. Here, T = t _A1 + t _A2 + t _A3 +... T _An = t _B1 + t _B2 + t _B3 +... T _Bn. Change the interval between transmissions. That is, while satisfying the formula, What is necessary is just to comprise so that the following relationship may be satisfied.

FIG. 10 and FIG. 11 are examples of specific systems that can effectively employ the present invention. First, the system shown in FIG. 10 is a system for managing the operators 51 to 53 of the cash register 55. Each of the operators 51 to 53 carries one transmitting device built in a name plate or the like, carries a receiving device in the cash register 55, and sets the receiving area 54 to a radius of about 1 m. The transmitting device transmits the name codes of the operators 51 to 53, respectively. Thus, the operator who operates the register 55 is known, and the operator is to be managed.

The figure shows a state in which the operator 55 is operating the register 55, and at this time, the other operator 52 operates the reception area.
Assuming that other operations are being performed within 54, the operator 51 and
The register 55 receives the code 52. This is register 55
Is recorded by the operator 51 or 52 as being operated by the operator 51 or 52, which is a better result in terms of management compared to a case where it is difficult to know who (the operator) has operated due to interference for a long time.

Next, the system shown in FIG. 11 is a system for managing building visitors such as security of offices and the like.
Each of the 100 visitors 62 to 71 carries a transmitting device for transmitting one name code, built in a name plate or the like,
This is a system for receiving and recording it by the receiving devices 59 to 61 and the recording device 72 installed in each of the rooms 56 to 58, and knowing who was in which room and managing it. Here the same room (for example, a room
When there are many visitors (for example, visitors 67 to 71) in 57), all the transmission codes can be received without interference by the communication method of the present invention, so that this system is established.

〔The invention's effect〕

As described above, according to the present invention, the transmission device determines the transmission time interval of the transmission signal according to the content of the data, so even if interference occurs, if the data content of the transmission signal is different, The transmission signal from the next time does not continuously interfere. Therefore, the interference frequency can be reduced without making the transmission device any complicated configuration.

In addition, since each transmission device transmits a transmission signal at a predetermined time interval different from the transmission time interval, and the transmission signal is transmitted a predetermined number of times at the transmission time interval within the predetermined time interval, The power consumption of each transmission device within the predetermined time interval becomes the same, and the variation in the consumption state can be reduced as a whole, and there is an excellent effect that a transmission device and communication convenient for use can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a system to which the present invention is applied;
FIG. 2 is a configuration diagram showing a transmission device according to a first embodiment of the present invention,
FIG. 3 is a diagram showing a transmission signal from the transmission device in the first embodiment, FIG. 4 is a configuration diagram showing a reception device, and FIG.
FIG. 6 is an electric circuit diagram embodying the transmitting device in FIG. 6, FIG. 6 is a configuration diagram showing the transmitting device of the first embodiment of the present invention, FIG. 7 is a diagram showing a transmission signal from the transmitting device in FIG. 8
FIG. 14 is a configuration diagram illustrating a transmission device according to a second embodiment of the present invention.
The figure is a diagram conceptually generalizing the first embodiment and the second embodiment, and FIGS. 10 and 11 are diagrams showing a specific system to which the present invention can be applied. 1 receiving device, 2 to 4 transmitting device, 7 transmitting circuit, 8
... data memory, 9 ... timer.

Claims (2)

(57) [Claims] A data setting unit for setting data to be transmitted; a transmission interval determining unit for determining a transmission time interval according to the content of the data; and a transmission signal according to the data, A transmitting unit for transmitting the transmission signal at a predetermined time interval different from the transmission time interval, and transmitting the transmission signal within the predetermined time interval. A transmission device for transmitting a predetermined number of times at a transmission time interval. 2. A transmission apparatus comprising a plurality of transmission devices and one reception device, wherein the plurality of transmission devices have the same transmission function, and transmit signals at transmission time intervals corresponding to the contents of data to be transmitted. And the receiving device can receive the transmission signal in the same process with respect to the plurality of transmitting devices. Further, the plurality of transmitting devices are arranged at predetermined time intervals different from the transmission time interval. While transmitting the transmission signal, the transmission signal is transmitted a predetermined number of times in the transmission signal time interval within the predetermined time interval, and the predetermined time interval and the predetermined number of times are transmitted to the plurality of transmission devices. A transmission method characterized by being set to the same value.