JPH0365898A - Wireless monitor - Google Patents

Abstract

PURPOSE:To receive a change point of data of transmission start being a reference point of reception synchronization clearly and to take sure synchronization by strengthening the transmission output for a prescribed time at the start of transmission. CONSTITUTION:A synchronizing signal generating section 9 instructing a transmission start and a time strengthening a transmission output and a transmission section 4 changing a transmission output are provided. That is, a synchronizing signal is generated from the synchronizing signal generating section 9 and the transmission section 4 intensifies the transmission output to start the transmission and then weakens the transmission output after laps of time of the pulse width of the synchronizing signal. Thus, it is easy to take synchronization at a receiver side and the transmission power at the sender side is lowered in average.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a wireless monitor device that transmits monitor information using radio waves.

2. Description of the Related Art In a conventional wireless monitor device, as shown in FIG. 4, an input signal input from a device 1 is digitized or binarized by a monitor input section 2. In the encoding unit 3,
Convert into numerical value using monitor input section 2.

When the binarized monitor information changes, an address, communication control code, etc. are added to generate a communication packet.

The transmitter 4 transmits the generated communication packets to UHF waves or VH waves.
It was transmitted at a constant transmission power on F-wave radio waves.

Problems to be Solved by the Invention However, in the above configuration, since the transmitter transmits at a constant output, the S/N ratio deteriorates and noise is added to the signal received by the receiver. When this happens, data change points become vague, making it difficult to synchronize reception.

The present invention is intended to solve such conventional problems, and aims to ensure reception synchronization.

Lllll! Means for Solving Il In order to solve the above problems, the wireless monitor device of the present invention is provided with a synchronization signal generation section that instructs the time to start transmission and when to increase the transmission output, and a transmission section that changes the transmission output. It is something.

Effect of the present invention With the above-described configuration, when a synchronizing signal is emitted from the synchronizing signal generating section, the transmitting section increases the transmission output and starts transmission, and after the pulse width time of the synchronizing signal has elapsed, the transmitting output is weakened. I decided to do so.

Therefore, reception synchronization can be easily achieved on the receiver side, and transmission power on the transmitter side can be kept low on average.

Embodiments Hereinafter, embodiments of the present invention will be described based on cut-out drawings.

FIG. 1 shows an embodiment of the wireless monitoring device of the present invention. The monitor signal from device 1 is sent to wireless monitor device 6.
The data is input into the system and binarized to represent the running and stopping states. When the binarized monitor information changes, a communication packet is generated by adding the own address, communication control code, and check code, and is transmitted to the receiver 7. The receiver 7 uses a check code to check whether the received communication packet has been received correctly, and if it has been received correctly, sends its own address and monitor information to the monitor display section 8. The monitor display unit 8 changes the display content of the part where the preset address and the own address match into the received monitor information.

Through the above series of operations, the wireless monitor device 6
The operating and stopping states of the device 1 are displayed on a monitor display section 8 located at a remote location. FIG. 2 is a block diagram of the wireless monitoring device of the present invention. The monitor signal of the device 1 is input to the monitor signal input section 2, and is converted into a binary value corresponding to the running or stopping state. When the monitor information changes, the encoder 3 generates a communication packet based on the set address, communication control code, monitor information, and check code. When a communication packet is generated by the encoding unit 3, the synchronization signal generation unit 9 outputs a synchronization signal having a predetermined pulse width to the transmission unit 4.

When the synchronization signal is input manually, the transmitter 4 starts transmitting the communication packet from the encoder 3 and increases the transmission output by the pulse width time of the synchronization signal from the start of transmission. FIG. 3 is a diagram showing the timing of communication. The output of the transmission signal is started in synchronization with the rise of the pulse of the synchronization signal,
The transmission output is made stronger by a portion corresponding to the pulse width of the synchronization signal. The received signal during the time when the synchronization signal is output has a good S/N ratio because the transmission output is strong, and the amount of noise on the data is small. Therefore, the point of change between data 1 and O in digital binary transmission becomes clear.

This makes it possible to reliably grasp the starting point of the received signal.

With the above configuration, in the received signal of the communication packet,
By increasing the transmission output, the first change point from O to 1, which indicates the start of data, can be prevented from being hidden by noise. Furthermore, since the transmission output is increased only at the start of transmission, the transmission power can also be reduced on average.

According to the wireless monitor device of the present invention, as described above, the effects of the invention are as follows.
Since the transmission output is strengthened for a certain period of time at the beginning of transmission, the data change point at the start of transmission, which is the reference point for reception synchronization, can be clearly received, and synchronization can be reliably achieved. Furthermore, since the transmission power is increased only at the beginning of the transmission, power consumption of the transmitter can be reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a wireless monitor device according to an embodiment of the present invention, FIG. 2 is a circuit block diagram of the same wireless monitor device, FIG. 3 is a communication timing diagram of the same, and FIG. 4 is a diagram of a conventional wireless monitor device. It is a circuit block diagram. 2...Monitor input section, 3...Encoding section, 4...Transmission section, 9...Synchronization signal generation section.

Claims (1)

[Claims] a monitor input section that digitizes an input signal; an encoding section that generates a communication packet from the monitor information digitized by the monitor input section; and a synchronization signal having a set pulse width when the communication packet is generated. A wireless monitor device comprising: a synchronization signal generating section; and a transmitting section that starts transmitting a communication packet by a synchronizing signal from the synchronizing signal generating section and increases the transmission output for a time equal to the pulse width of the synchronizing signal from the start of transmission.