JPH08289283A - Monitoring system - Google Patents

Abstract

PURPOSE: To transmit the camera video and measured data, etc., at a required place to other place by a spreaded spectrum signal by radio, to project these on a reception side monitor and to provide them for a monitoring. CONSTITUTION: The analog signal of each of the camera 1 and the measuring part 3 installed at a required place is converted into a digital signal (A/D conversion parts 2 and 4). For the video signal, the image compression processing for a transmission band compression is performed in an image compression processing part 5 and the multiple processing by measured data and a time division multiplex, etc., is performed in a multiplex processing part 6. The data for which the multiple processing is performed is transmitted by a spread spectrum system. After the side receiving the spread spectrum signal demodulates the data for which the multiple processing is performed by a reception means 11, the data is separated into video data and measured data in a data separation part 12. The video data is got back to original video data in an image expansion processing part 13 and a graphic processing is performed to the measured data in an image processing part 14. The data after each of these processings is got back to the analog signal (D/A conversion parts 15 and 16) and the signal is projected on a monitor 18 via a video composite part 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance system, and more particularly, to wirelessly transmit a camera image and measurement data at a required location to another location by using a spread spectrum signal, and transmit the image and the measurement data. It relates to the monitoring system that you see on the monitor.

[0002]

2. Description of the Related Art Conventionally, when a video image of a quasi-moving image or more is sent to another place separated by a certain distance and is monitored there, it is generally transmitted by a cable. Further, when the measurement data or the like by the measuring instrument is sent together with the above video, it is necessary to further provide a cable for the transmission. In addition to the above, there is a method of using a television broadcasting system as a method of wirelessly transmitting a video of a quasi-moving picture or higher, but this method requires a large amount of equipment for the use of one company or some people Expense is also expensive and not a realistic method.

[0003]

Therefore, it would be convenient if video images of a quasi-moving image or more could be transmitted easily and at low cost. The present invention has been made from such a point of view, and an object thereof is to provide a monitoring system that wirelessly transmits camera images, measurement data, and the like of a specific place to another place.

[0004]

According to the present invention, there is provided a surveillance video camera provided in a required place, and a first A / D converter for converting an analog video signal from the video camera into digital video data. A measuring section for measuring required data, a second A / D converting section for converting an analog measuring signal from the measuring section into digital measuring data, and digital video data from the first A / D converting section An image compression processing unit for performing compression processing for transmission band compression, and multiplexing for multiplexing digital video data compressed by the image compression processing unit and digital measurement data from the second A / D conversion unit. A transmitter comprising a processing unit and a spread spectrum signal transmitting means for wirelessly transmitting the data from the multiple processing unit as a spread spectrum signal, and a spectrum from the transmitter. A spread spectrum signal receiving means for receiving the spread spectrum signal, a data separating section for separating the data received and demodulated by the spread spectrum signal receiving means into digital video data and digital measurement data, and digital video data from the data separating section. An image decompression processing unit for decompressing into a signal in a required band, an image processing unit for performing image processing for graphic display of digital measurement data from the data separation unit, and digital video data from the image decompression processing unit are analog. A first D / A conversion unit for converting into a video signal, a second D / A conversion unit for converting digital measurement data from the image processing unit into an analog measurement signal, and the first D / A conversion unit. A video synthesizing unit for synthesizing the analog video signal from the second D / A conversion unit with the analog measurement signal from Serial there is provided a monitoring system configured with a receiving apparatus comprising a monitor unit for Utsude a video signal from the video synthesis unit.

[0005]

The analog signals of the video camera and the measuring instrument installed at the required locations are converted into digital signals (first and second A / D converters). The digital video signal is subjected to image compression processing for transmission band compression, and after the processing, multiplexing processing is performed with measurement data by time division multiplexing or frequency multiplexing. The data subjected to the multiplex processing is transmitted by a spread spectrum method. The side that receives the spread spectrum signal demodulates the multiplexed data, and then separates it into video data and measurement data. Image expansion processing is performed on the video data to restore it to the original video data, and graphic processing is performed on the measurement data. The data after each of these processes is returned to an analog signal, and the combined image is displayed on a monitor.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A monitoring system according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an essential part showing an embodiment of a monitoring system according to the present invention, FIG. 2 is an explanatory diagram when data is time-division multiplexed, and FIG. 3 is an example of a monitor display.
In FIG. 1, 1 is a video camera for surveillance installed in a required place, 2 is a first A / D converter for converting an analog video signal from the video camera 1 into digital image data, and 3 is the required place. Installed in the measurement unit 4 for measuring required data, 4 is a second A / D conversion unit for converting an analog measurement signal from the measurement unit 3 into digital measurement data, and 5 is a first A / D conversion unit 2. , An image compression processing unit for compressing the digital video data for transmission band compression, 6 denotes the digital video data compressed by the image compression processing unit 5 and the digital measurement data from the second A / D conversion unit 4. Is a spread spectrum signal transmitting means for wirelessly transmitting the data from the multiplex processing portion 6 as a spread spectrum signal, and 8 is a transmitter comprising the above 1 to 7.

Further, 11 is a spread spectrum signal receiving means for receiving the spread spectrum signal from the transmitter 8, and 12 is data for receiving and demodulating by the spread spectrum signal receiving means 11 to be separated into digital video data and digital measurement data. Data separation unit, 13 is data separation unit 12
An image expansion processing unit for expanding the digital video data from the image processing unit, an image processing unit for processing the digital measurement data from the data separation unit 12 so as to display it in a graphic form, and a digital image data from the image expansion processing unit 13 First D / A converter for converting the video signal into an analog video signal, 16
Is a second D / A conversion unit for converting the digital measurement data from the image processing unit 14 into an analog measurement signal, and 17 is the first D / A conversion unit.
A video synthesizing unit for synthesizing the analog video signal from the A / A conversion unit 15 and the analog measurement signal from the second D / A conversion unit 16, 18 is a monitor unit for displaying the video signal from the video synthesizing unit 17, Reference numeral 19 is a receiving apparatus including the above 11 to 18.

Next, the operation of the present invention will be described separately for the transmitter and the receiver. The following explanation (Fig. 1)
Then, the case where the present invention is applied to a golf course is taken as an example, and from this relationship, the measuring unit 3 is composed of two measuring instruments, an anemoscope 3a and an anemometer 3b. In the case of this example, the transmitter 8 is installed near the hall (green) of a course.
19 will be installed near the tee ground of the hole so that the condition, wind direction, wind speed, etc. near the hole can be seen on the monitor screen during the tee shot.

(1) Transmitter The first A / D conversion is performed between the video signal from the video camera 1 installed at a required location (in this example, near the hall) and the measurement signals from the anemoscope 3a and the anemometer 3b. Part 2, second A /
An analog signal is converted into digital data by the D converter (4a, 4b). The digital video data from the first A / D converter 2 is compressed by the image compression processor 5 to compress the transmission band. The video data that has been subjected to the compression processing and the data relating to the wind direction and the wind speed are multiplexed by time division as shown in FIG. In FIG. 2, the wind direction and wind speed are included in the wind information. The multiplexing process is not limited to the time division multiplexing described above, but may be frequency multiplexing or code division multiplexing. The multiplexed data is transmitted as a spread spectrum signal (spread spectrum signal transmitting means 7). Specifically, the error correction code addition unit 7a is applied to the multiplexed data.
A code for error correction is added by, and spread spectrum modulation is performed on the signal after adding the code (spread spectrum modulator 7
b). The spread spectrum modulation itself may be a general modulation method using a PN code. Next, information modulation such as PSK (Phase Shift Keying) is performed (information modulator 7c),
The signal is transmitted from the transmitter 7d as a radio wave of a required frequency.

For the anemometer 3a and the anemometer 3b, existing sensors or the like may be used. For example, the following principle is known. Wind vane A potentiometer is interlocked with the rotation axis that rotates according to the wind direction, which is the body, tail, and rotation axis that are integrated. When the tail fin receives the wind, the rotation axis rotates to a position along the wind direction, and the position of the potentiometer also changes. The resistance value of this potentiometer changes depending on the rotational position (rotation angle). The potentiometer resistance (Rx), the reference resistance (R) and the reference capacitor (C), which are determined by the position
A CR oscillator composed of is provided. The oscillation frequency of this CR oscillator changes according to the Rx, that is, the wind direction (azimuth). Therefore, the oscillation frequency represents the wind direction. If this oscillation frequency is converted into a digital signal (A / D converter 4a), it becomes wind direction data.

An anemometer: A propeller that rotates in response to wind and a rotating disk that is directly connected to the rotating shaft of the propeller are provided, and a required number (eg, 10) of magnets of a rectangular parallelepiped are radiated on the disk. Place it on top. Furthermore, a Wiegand wire (magnetic sensor) that generates an electromotive force due to a change in magnetic field is provided near the magnet. In this case, the Wiegand wire and the rotating disk having the magnet attached thereto have a structure in which the mechanical positional relationship does not change even if the wind direction changes. With this structure, the propeller rotates according to the wind speed, and when the disk directly connected to it rotates, the magnet on the disk crosses the Wiegand wire. This causes the Wiegand wire to generate a short electrical pulse. The number of these pulses generated per unit time changes according to the propeller rotation speed, and the higher the wind speed, the more pulses generated per unit time. Further, it is known that the rotation speed of the propeller is proportional to the wind speed. Therefore, wind speed data can be obtained by previously associating the wind speed with the number of pulses from these relationships. The anemometer and anemometer described above are generally integrated.

(2) Receiving device The radio wave transmitted from the transmitting section 7d is received by the RF circuit 11a of the spread spectrum signal receiving means 11, converted to an intermediate frequency signal and amplified, and then spread by the correlator 11b. Demodulated. The correlator 11b is a SAW matched filter or S
A general one such as an AW convolver may be used. Correlator
The data reproducing circuit 11c reproduces the transmission data based on the signal demodulated and demodulated in 11b, and the error correcting unit 11d processes the reproduced data for code error correction. The original transmission data is reproduced by the same code correction process, but this data is a multiplexed signal having the arrangement of FIG. Therefore, the data separation unit 12
Is separated into the video data and the measurement data of the wind information on the wind direction and wind speed.

Of the separated data, the image expansion processing unit 13 expands the video data. This is because the signal compressed by the transmitting side is returned to the signal in the required band. In addition, the wind direction and wind speed information data is obtained by the image processing unit 14.
First image processing unit 14a (wind direction) and second image processing unit 14
b (wind speed) to perform graphic processing. This graphic processing is created based on graphic display software created in advance using a personal computer or the like. The digital video data from the image expansion processing unit 13 and the digital measurement data from the image processing units 14a and 14b are transferred to the first D
The A / A converter 15 and the second D / A converter 16 restore the analog signals, and the video synthesizer 17 synthesizes them.
The combined image is displayed on the monitor unit 18. FIG. 3 shows an example of the display. FIG. 3 shows that the wind direction (i) and the wind speed (b) subjected to graphic processing are combined and displayed together with the camera image. The above is the case where the present invention is applied to, for example, a golf course. In addition to this, various uses such as monitoring the production state in an automatic production line in a factory together with data such as room temperature and humidity can be considered.

[0014]

As described above, according to the present invention, it is possible to wirelessly transmit a camera image or measurement data of a specific place to another place by using the spread spectrum communication system and monitor it. Further, this wireless transmission makes it possible to realize a simple and low-priced monitoring system by eliminating the cable laying work required in the conventional general method.

[Brief description of drawings]

FIG. 1 is a principal block diagram showing an embodiment of a monitoring system according to the present invention.

FIG. 2 is an explanatory diagram when data is time division multiplexed.

FIG. 3 is a diagram showing a monitor display example.

[Explanation of symbols]

 1 Video camera for monitoring 2 1st A / D conversion part 3 Measuring part 3a Anemometer 3b Anemometer 4 2nd A / D conversion part 5 Image compression processing part 6 Multiple processing part 7 Spread spectrum signal transmission means 8 Transmission Device 11 Spread spectrum signal receiving means 12 Data separation unit 13 Image expansion processing unit 14 Image processing unit 15 First D / A conversion unit 16 Second D / A conversion unit 17 Video synthesis unit 18 Monitor unit 19 Receiving device

Claims (5)

[Claims] 1. A monitoring video camera provided at a required location, a first A / D conversion unit for converting an analog video signal from the video camera into digital video data, and measurement for measuring the required data. Section, a second A / D conversion section for converting an analog measurement signal from the measurement section into digital measurement data, and compression of digital video data from the first A / D conversion section for transmission band compression. An image compression processing unit for processing, a multiplexing processing unit for multiplexing the digital video data compressed by the image compression processing unit and the digital measurement data from the second A / D conversion unit,
A transmission device comprising a spread spectrum signal transmission means for wirelessly transmitting the data from the multiplexing processing unit as a spread spectrum signal, a spread spectrum signal reception means for receiving the spread spectrum signal from the transmission device, and a spread spectrum signal reception means. A data separation unit that separates the data received and demodulated by the digital video data and the digital measurement data, an image expansion processing unit that expands the digital video data from the data separation unit into a signal in a required band, and the data separation unit. An image processing unit for performing image processing for digital display of the digital measurement data, a first D / A conversion unit for converting the digital video data from the image expansion processing unit into an analog video signal, and the image processing. Digital measurement data from the part is converted to an analog measurement signal. A second D / A converter for conversion, analog video signal from the first D / A converter and a second D
A monitoring system comprising: a receiving device including a video synthesizing unit for synthesizing an analog measurement signal from the A / A converting unit and a monitor unit for displaying the video signal from the video synthesizing unit. 2. The monitoring system according to claim 1, wherein the multiplex processing of the multiplex processing unit in the transmitter is time division multiplex. 3. The monitoring system according to claim 1, wherein the multiplex processing of the multiplex processing unit in the transmitter is frequency division multiplex. 4. The multiplex processing of the multiplex processing unit in the transmitter is code division multiplex.
The described surveillance system. 5. The monitoring system according to claim 1, wherein the measuring unit in the transmitting device is composed of a plurality of measuring devices for measuring different data.