JPH0468927A - Level measuring device - Google Patents

Abstract

PURPOSE:To surely prevent a battery from being worn out by interrupting a power switch with a power OFF signal outputted from a power OFF signal generating means when a level non-fluctuation signal of a prescribed level or over is consecutive for a prescribed time. CONSTITUTION:A 1st power OFF signal generating means 20 discriminates whether or not a non-input signal is consecutive for a prescribed time or over and when the state is consecutive for a prescribed time or over, a power OFF signal is outputted. Then a power OFF means 23 outputs an interrupt signal, a power switch 25 is opened to stop the power supply. On the other hand, when the level is a prescribed level or over, a level fluctuation width detection means 21 discriminates whether or not a level fluctuation in excess of a prescribed level is in existence and when there is no fluctuation over a prescribed level in the level of the signal, a level non-fluctuation signal is caused. A 2nd power OFF signal generating means 22 discriminates whether or not a level non- fluctuation signal is consecutive for a prescribed time and outputs a power OFF signal when the level non-fluctuation signal is consecutive for a prescribed time or over. Thus, useless consumption of the battery is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a level measuring device for measuring the level of a signal received by an antenna, and more specifically, the present invention relates to a level measuring device for measuring the level of a signal received by an antenna. Regarding level measuring instruments.

[Conventional technology]

As a circuit for preventing wear and tear as described above, there is a circuit that uses a timer to stop power supply after a certain period of time has elapsed.

[Problem to be solved by the invention]

Conventional level measuring instruments equipped with such circuits have a problem in that if the level measuring work is prolonged, the power may be cut off even during the work. Therefore, if the setting time of the timer is made longer, there is a problem that, for example, even if the measuring operation is interrupted and another work is done, the power continues to be applied until the timer expires, which consumes the battery.

The present invention was made in order to solve the problems (technical problem B) of the prior art described above, in which a state in which there is no signal to be measured continues, and a state in which there is no substantial level fluctuation in the signal continues. It is an object of the present invention to provide a level measuring instrument equipped with a circuit that ensures that battery consumption is prevented by cutting off the power supply when it is determined that the .

[Means to solve problems]

In order to achieve the above object, the level measuring device according to the present invention includes: an input end for receiving a first intermediate frequency signal; a level measuring means for measuring the level of the first intermediate frequency signal input to the input end; an indicator for displaying the level of the signal measured by the level measuring means; a no-input detection means for determining that the level measured by the level measuring means is below a certain value and generating a no-input signal; a first power-off signal generation means that generates a power-off signal when the signal continues for a certain period of time; and a first power-off signal generating means that generates a power-off signal when the signal continues for a certain period of time; level fluctuation range detection means for outputting the
a second power-off signal generating means that outputs a power-off signal when the level-unchanged signal continues for a certain period of time or more;
The device is equipped with a power-off means for receiving the power-off signal and outputting a disconnection signal to the power switch.

[Effect]

The level of the signal entering the input terminal is measured by the level measuring means and displayed on the display. When the level of the signal is below a certain value, the no-input detection means generates a no-input signal, and when the no-input signal continues for a certain period of time or more, the first power-off signal generating means outputs a power-off signal to A power off means disconnects the power switch. Furthermore, even if the level of the signal entering the input terminal is above a certain value, if there is no fluctuation in the level of the signal, the level fluctuation range detection means generates a level fluctuation signal, and the level fluctuation signal remains unchanged for a certain period of time. If this continues, the power off means will turn off the power switch in response to the power off signal output from the second power off signal generation means.

〔Example〕

The drawings showing the embodiments of the present application will be described below.

FIG. 1 shows a situation in which the direction of the antenna is adjusted using a level measuring device. 1 is a level measuring device, 2 is a mast fixed to a foundation, and 3 is a parabolic antenna shown as an example of an antenna, which is attached to the mast 2 via a fixture 4 that allows direction adjustment such as elevation angle and azimuth angle. The antenna 3 is a well-known antenna for receiving signals from broadcast signal satellites and communication satellites, 5 is a reflection antenna, 6 is an arm, 7 is a primary radiator for receiving the above-mentioned signals, and 8 is the received signal. 6, which is a converter for converting the signal into a first intermediate frequency signal.
Next, the level measuring device 1 will be explained. 10 is a case, 11 is an input end for receiving the first intermediate frequency signal,
It is connected to the output terminal of the converter 8 using a connecting cable, for example, a coaxial cable 12. Reference numeral 13 denotes a display device for displaying the channel of the measurement signal and the level of the measured signal, for example, a liquid crystal display panel is used.

Reference numeral 14 denotes an operation switch for selecting the channel of the measurement signal. 15 is a starting switch for starting the level measuring device.

Next, FIG. 2 shows the overall functional configuration of the level measuring device 1. As shown in FIG. 16 is a tuning circuit, 17 is a detection circuit, 18 is a level measuring means, and the first channel selected after being input to the input terminal 11 is
It is used to measure the level of intermediate frequency signals. 19
is a no-input detection means that determines that the level measured by the level measuring means 18 is below a certain value and generates a no-input signal.

The constant value is, for example, 43 dBμ. This is because a margin of 1 dB is taken from the lowest input level value of 44 dBμ of the C5 commercial tuner, allowing measurement up to 43 dBμ, and anything below that level is determined to be no input.

Reference numeral 20 denotes a first power-off signal generating means, which generates a power-off signal when the above-mentioned no-input signal continues for a certain period of time or more. The above-mentioned fixed time is, for example, 5 minutes. This is a CS antenna (for example, 1.2 mm in diameter) due to antenna construction.
This was determined by measuring the general time required to adjust the direction of the direction. Reference numeral 21 denotes level fluctuation range detecting means, which determines that the level fluctuation range determined by the level measuring means is less than a certain width and outputs a level no fluctuation signal. The above-mentioned constant width is, for example, ±0.75 dB. This was selected by taking into account changes in the measured value due to changes in the level of signals from satellites and changes in the degree of modulation based on program content. Reference numeral 22 denotes a second power-off signal ordering means, which outputs a power-off signal when the level-unchanged signal continues for a certain period of time or more.

This certain period of time is determined in the same manner as in the case of the first power off signal generating means. Reference numeral 23 denotes power off means, which receives the power off signal and outputs a disconnection signal to the power switch 25. 24 is a power source, for example, a battery is used, and a power switch 2 is used as a member that requires current for operation.
It is connected via 5.

Next, FIG. 3 shows the electrical configuration of the level measurement S1. All of the members indicated by reference numerals 27 to 31 are well-known, and 27 is a CPU, 28 is a ROM, and 29 is a RAM, and these constitute the blocks indicated by numbers 18 to 23 in FIG. . 30 is an input port, 31
is an output boat.

The direction adjustment of the antenna 3 using the level measuring device 1 is as follows. Install the antenna 3 as shown in Figure 1,
Connect the level measuring device 1 Next, press the start switch 15.Then, the power switch 25 will close and the level measurement S1 will be in the operating state.Next, operate the operation switch 14 while looking at the display 13 to adjust the direction. Select the channel to be used. In this state, when the first intermediate frequency signals of a plurality of channels outputted from the converter 8 of the antenna 3 are applied to the input terminal 11, the signal of the selected channel is extracted from among those signals by the tuning circuit 16. The detected voltage is applied to the level measuring means 18 to measure the level, and the level is displayed on the display 513. Therefore, while looking at the display 13 as shown in FIG. 1, the azimuth and elevation of the antenna 3 are adjusted so that the level displayed there is maximized. When this state is reached, the antenna 3 is fixed and the level measuring device 1 is removed.

This completes the adjustment of the antenna direction tIi. Note that if there is only one channel of the first intermediate frequency signal output from the converter 8, the level measuring device uses the channel selection circuit 1.
6 and the operation switch 14 may not be provided.

Next, power cut-off control during the operation of the level measurement iS1 will be explained based on the flowchart of FIG. 4. When the measuring device is activated as described above, the current level of the input signal is measured in step P1.

Next, in step P2, the no-input detection means 19 determines whether the level of the signal is below a predetermined constant value,
If it is less than that, it will result in no input signal.

Next, in step P3, the first power-off signal generating means 20 determines whether or not the no-input signal continues for a certain period of time or more, and if it continues for a certain period of time or more, it outputs a power-off signal. Then, in step P4, the power off means 23 outputs a disconnection signal, the power switch 25 is opened, and the supply of power is stopped.

On the other hand, if the level determined in step P2 is above a certain value, then in step P5, the level fluctuation range detection means 21 determines whether or not the signal has a level fluctuation exceeding a certain range. It is determined, and if the level of the signal does not fluctuate by more than a certain width, a level fluctuation signal is generated. Next, in step P6, the second power off signal generating means 2
2 determines whether the level-unchanged signal continues for more than a certain period of time, and if it continues for more than a certain period of time, outputs a power off signal. Then, in step P4, the same operation as above is performed.

The level measuring device 1 mentioned above is operated by pressing the operation switch 1 during its operation.
When the operation 4 is performed, the operation of the level measuring device 1 starts again from the "start" shown in the flowchart of FIG.

〔Effect of the invention〕

As described above, in the present invention, when adjusting the direction of the installed antenna 3, by changing the direction of the antenna 3 while watching the level displayed on the display 13 so that the level increases. , it is possible to adjust the antenna 3 to the appropriate direction, and in the case of the above adjustment, when leaving the location of the level measuring device 1, such as when going to check on the indoor TV receiver, in other words, when the level measurement device 1 is left, it is possible to measure the level. If you do not continue
The electric fi24N is useful because it can cut off the power supply from the battery and prevent unnecessary battery consumption.

Moreover, the power supply as described above is cut off not only when the direction of the antenna 3 is not adjusted and there is no input signal to the input terminal 11 for a certain period of time or more, but also when the level of the signal input to the input terminal 11 is This is also done when a state in which there is no level fluctuation due to a change in the direction of the antenna continues for a certain period of time, so for example, when the rIi adjustment of the direction of the antenna is halfway completed, that is, in a state where the input signal is present, the above Even if you leave the place, the above-mentioned disconnection is performed and the above-mentioned effect of preventing battery consumption is reliably achieved.

[Brief explanation of the drawing]

The drawing is the real Jl of the application! ! ! ! Figure 1 shows how to adjust the direction of the antenna using a level measuring device, Figure 2 shows the overall configuration of the level measuring device in functional blocks, and Figure 3 shows how to measure the level. FIG. 4 is a flow chart showing the power cut-off control procedure. 11... Input end, 18... Level measuring means, 19.
No-input detection means, 20... First power off signal generation means, 21... Level fluctuation range detection means, 22... Second
power off signal generating means, 23. power off means; Figure 4

Claims (1)

[Claims] an input end for receiving the first intermediate frequency signal; a level measuring means for measuring the level of the first intermediate frequency signal inputted to the input end; and a display for displaying the level of the signal measured by the level measuring means. , a no-input detection means for generating a no-input signal by determining that the level measured by the level measuring means is below a certain value; and a first for generating a power-off signal when the no-input signal continues for a certain period of time or more. a power off signal generating means, a level fluctuation range detecting means for determining that the level fluctuation range measured by the level measuring means is below a certain range and outputting a level no fluctuation signal, and a level fluctuation range detecting means for outputting a level no fluctuation signal; It is characterized by comprising a second power off signal generating means that outputs a power off signal when the power off signal continues for a certain period of time or more, and a power off means that receives the power off signal and outputs a disconnection signal to the power switch. level measuring device.