JPS5944104A - Antenna device - Google Patents

Abstract

PURPOSE:To reduce inexpensively and easily ghost and fading, by manually operating an antenna device and visually evaluating the picture quality and selecting an antenna weight having the antenna directivity of the best picture quality. CONSTITUTION:A viewer watches the picture of a television receiver 4 while the 1st switch 6 is turned ON. At this time, a control circuit 5 successively reads out antenna weight data stored in an ROM, etc., and changes the antenna directivity looking from a combiner 3 by changing the antenna weight of a weighting circuit 2. When a good picture is obtained, the 1st switch 6 is turned OFF and the antenna weight data at this time is stored in a memory. This operation is repeated until all the antenna weight data is the ROM are executed and, when the operation is terminated, the 2nd switch 7 is turned ON. In this case, a selected antenna weight data is read out and supplied to the weighting circuit 2 and, when the best picture is obtained, the 2nd switch 7 is turned OFF.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is directed to controlling antenna directivity.
The present invention relates to an antenna device that enables high-quality television broadcast reception.

[Technical background of the invention and its problems] In recent years, in the field of television broadcast reception, the number of buildings in cities has increased, and the form of broadcast reception itself has become more diverse, as seen in the reception of television broadcasts on mobile devices. As a result, the radio wave environment has become complicated, causing problems such as ghosting and fading. Solving these ghost and fading problems has become an important issue from the standpoint of antenna technology.

As is clear from the antenna directivity shown in Figure 1, ghosting and fading occur when the antenna simultaneously receives reflected waves Bl and B2 from buildings, etc., in addition to the desired signal input. .

In a radio wave environment where such ghosts and fading occur, the quality of television broadcast reception deteriorates significantly.

[Object of the Invention] The present invention improves the drawbacks of the conventional device described above, and aims to provide an antenna device that is safe and can easily reduce ghosting and fading.

[Summary of UCM] This invention 1. The antenna weights having the antenna directivity with the best image quality are selected by human operation and judgment on the quality of the television image.

[Effects of the invention] According to this invention, because humans evaluate the quality of drawings (8), the number of times 'cl's tio/Funari becomes poor,
Ghosts and fading can be reduced easily and inexpensively.

[Embodiments of the invention] This invention will be explained in detail below.

FIG. 2 shows a refreshing embodiment of the present invention, in which (1) is an antenna element, (2) is a weighting circuit that forms antenna weights, and (3) is an output signal of each weighting circuit (2). It is a synthesizer that synthesizes. The output signal of the synthesizer (3) is sent to the television receiver t.
3 (4)!・Supplied with On the other hand, the antenna weight of the weight circuit (2) is varied by a control signal output from the control circuit (5).
A first switch (6) and a second switch (1) are connected.

Below, the control circuit (5), the first slot (6) and the second
switch (explain the operation of the force).The first switch (6
) is in the ON state, the control circuit (5) automatically sequentially reads out the antenna weight data already stored inside it, converts it into a control signal, and controls the weight circuit (5). 2) Supply K. In the above operation), the antenna directivity seen from the combiner (3) changes over time. Next, the first switch (6) is turned on;6. OFF
, the control circuit (5) stores the antenna weight data at that time in a predetermined memory.

Hereinafter, for clarity of explanation, the antenna weight data stored in the predetermined memory will be referred to as selected antenna weight data. On the other hand, when the second switch is in the ON state, the selected antenna weight data is sequentially converted into a control signal and supplied to the weight circuit (2).

Next, the operation of the present invention will be explained in detail using the time chart shown in FIG. In Figure 3, (a) is z
i, the state of the switch (6) of 1, and (h) the read clock of the ROM. The numbers shown in the waveform (1)) indicate that different antenna weight data 3 are being read. Now, for simplicity's sake.

It is assumed that nine types of antenna weight data are stored in the ROM. Furthermore, in the figure, (C) shows a control signal for varying the antenna weight. The control signal changes in synchronization with the read clock (b) K.

The antenna weight is varied by this control signal (C), and the antenna directivity changes over time.

Next, in (d), the state waveform (a) of the first switch is ON.
This clock is generated at the time of transition from to OFF, and is a write clock for storing antenna weight data at that time in a predetermined memory. (e) is a waveform showing the state of the second switch. (f) shows a clock for reading out already stored selected antenna weight data from a predetermined memory when the second switch is in the ON state. The control signal (C) changes in synchronization with the read clock ('), and a waveform corresponding to the selected antenna weight data stored in a predetermined memory appears.

Next, the actual operation will be explained using FIGS. 2 and 3.

The viewer first observes the image on the television receiver (4) while turning on the first switch (6). At this time, the control circuit (5) sequentially reads out the antenna weight data already stored in the ROM etc. using the read clock (b), changes it to a control signal (C), and sends it to the weight circuit (2). The antenna weight of the antenna is varied. Due to this operation, the antenna directivity seen from the combiner (3) changes over time, so the image on the television receiver (4) changes as the antenna directivity changes. The viewer turns off the first switch (6) when a high-quality image with few ghosts or fading is obtained while observing a temporally changing image.

At this time, the control circuit (5) stores the antenna weight data at this point in a predetermined memory according to the write clock (ψ). This data corresponds to the 81τ1 switch (6).
While observing the image in the same way, when a good image is obtained, turn off the first switch. The antenna weight data at this point is the write clock (d
) is written to a predetermined memory by the first clock. Repeat the above operation until all the antenna weight data in the ROM has been executed.

When the above operation is completed, the viewer then presses the second switch (7).
) is turned on. At this time, the control 4i1 circuit (5) reads the selected antenna weight data using the read clock (f), converts it into a control signal (C), and supplies it to the weight circuit (2)K. The selected antenna weight data is the antenna weight when the image is good. While viewing the image, the viewer turns off the second switch when the image is the best. Through this operation, it is possible to determine the antenna weights that provide the best image.

As explained above, the present invention can obtain a high-quality television image in which ghosts and fading are minimized by performing the second step. In the first step, a plurality of antenna weights are selected for which the image is considered to be of good quality, and in the second step, the best image is obtained from among the selected plurality of antenna weights. The antenna weight that can be used is the final antenna weight.

According to this invention, a mechanism for detecting ghosts and fading is not required, and the circuit configuration becomes simple.

Moreover, if the control circuit (5) is configured with a microconbeater, it becomes possible to provide an inexpensive antenna device.

The invention is not limited to the above embodiments. For example, there may be a plurality of second switches, and each switch may select the selected antenna weight data, or a communication device, radio, etc. may be used in place of the television receiver (4). A similar effect can be obtained. In short, the present invention can be implemented with various modifications without departing from the gist thereof, and the invention will bring about outstanding effects.

[Brief Description of the Drawings] Fig. 1 is a diagram of the antenna directivity of a conventional example, Fig. 2 is a schematic diagram showing an embodiment of the present invention, and Fig. 3 is a time chart of an embodiment of the present invention. show. l...Antenna element, 2...Weighting circuit, 3...Synthesizer, 4...TV receiver, 5...? : i control circuit, 6... first switch, 7... second switch. Representative fP Physician Kensuke Chika (1 person) Figure 1

Claims (1)

[Claims] A plurality of antenna elements, weight circuits connected to these antenna elements, a combiner that combines output signals from these weight circuits, a control circuit that controls antenna weights of the weight circuit, and this control circuit. a first switch and a second switch connected to the
In the N state, the control circuit generates a control signal that varies the antenna weight, and the first switch is turned on.
When the second switch changes from to OFF, antenna weight data corresponding to the control signal at that time is stored, and when the second switch is in the ON state, a control signal is generated based on the stored antenna weight data. antenna device.