JPS6022808A - Automatic directivity changeover antenna device - Google Patents

Abstract

PURPOSE:To select automatically the best reception state by providing a means changing over the directivity until a noise in a composite video signal from a television receiver is minimized to an indoor antenna of the television receiver. CONSTITUTION:A flyback pulse (a) is inputted from a terminal A and a horizontal synchronizing signal (b) is inputted from a terminal B. After the flyback pulse (a) is differentiated by a differentiation circuit comprising C1, R1, the pulse is inverted 12 and an FF15 is reset at a front edge of a differentiated pulse (c). On the other hand, the signal (b) is delayed 16, and the FF15 is reset at the front edge of a delayed pulse (d). Thus, the FF15 is not reset until the next signal (b) is incoming when the signal (b) is missing and a high level signal (e) is inputted to an NAND gate 13 during this time, then an output (h) of an NAND gate 14 goes to a high level. In extracting the noise component in the composite video signal by the pulse (h), even if the horizontal synchronizing signal (b) is missing, no malfunction is caused in the switching of the antenna directivity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for automatically switching the directivity of an antenna used in a television receiver.

Conventional configurations and their problems In general, when receiving TV waves with an indoor antenna, the direction of the antenna element is changed depending on the channel, or the shape is changed to change the directivity of the antenna to achieve the optimal image condition. It was necessary to make a selection, and the operation was very troublesome and inconvenient for the viewer.

Recently, as shown in Fig. 1, the connection of multiple antenna elements can be changed using a rotary switch S to change the directivity of the antenna into several types. Antennas are commercially available. However, even in this case, there remains the hassle of switching this rotary switch every time the channel is changed, resulting in a cine-bin.

Furthermore, recently, there has been an increase in the number of TV receivers that can be operated by controlling the channel switching f l so-1-=1 control.
・Receive on Tena” Kabuto, switch the channel on Kabuto, and -
2. Since it becomes necessary to switch between channels, the channel remote control's (history) will be reduced by 31'.

So; - singing (c, when a person approaches the antenna V to switch A/Tenna, and when a person moves away from the antenna after changing 57).
Since the reception status often changes between 212 and 212, manually performing the U adjustment of -i' endena is a cumbersome and troublesome operation.

Point 1 of the invention: 74. The invention solves the problems of the conventional inconveniences and 9 problems as described above, and automatically allows you to select a TV receiver (speculation channel) and at the same time. This is a device that can determine the directivity of the antenna from the top of the faun and select the optimal image condition.

<gu, [1; i'l' of j, j! l! j Honsan Akira・
(sun, -i-re [2 receiver channel/: select j
Shaku-41, and the double envy father 1 fixed] By changing the combination of this anbuna element lpJ, several types of 1'11 times are automatically switched, ・So 11 child - 1 of the head? i-ko 11 painting bride 1
It is detected by the water ``i'' in the composite 1 clear signal of the Lulu 1 TV 1' and 2 1 image plane, and the noise signal y superimposed on the synchronization signal - bow shell 1'F - i part tJ, and the 41 le.

Orientation 1 where the minutes are the least! 'Choose I-IJV! As a means of extracting the noise component, the horizontal synchronization of the horizontal synchronization between the horizontal synchronization of the composite image and the bow is Horizontal November u1 Shinshishi is arrowed (・4↓i'v now video Shinyumi's child, φ
, the period is 1. LJζ is used to generate a pulse of I/K and extract the noise component with the pulse.

DESCRIPTION OF THE EMBODIMENTS A block diagram of the entire apparatus '1 according to an embodiment of the present invention is shown in the second diagram.
As shown in the figure.

A plurality of antennas 1 are connected to the switching circuit 2 without being separated. Here, the television signal received by the appropriately combined side elements is supplied as an input 7 of the television receiver 3. The composite video signal detected by the television receiver 3 is supplied to the noise detection circuit 4, and the output of this noise detection circuit 4 is sent to the best point detection circuit 5.
−＼Supplied. Switching circuit 2 for the output of the best point detection circuit 5
6 control circuits supplying 1~, J
When the 1st mode is selected, the switching circuit 2 is fixed. The noise detection circuit 4 is also supplied with a horizontal synchronizing signal and a flybar knockout signal from the television receiver, and generates a noise extraction pulse to be described later.

This automatic directivity selection control i-loop resets the channel switching pulse from the television receiver so that it operates when the television receiver is turned on and when a channel is selected. supplying.

Next, the noise detection circuit 4, which is a feature of the device, will be explained. FIG. 3 shows a block diagram of the noise detection circuit 4. In FIG. 3, a matching video signal from a television receiver 3 is supplied to a sampling amplifier 8. As shown in FIG.

The sampling pulse is generated by supplying a horizontal synchronizing signal and a fly-hanok palme from the television receiver 3 to the sampling pulse generator 9.
Generate with.

Next, a concrete circuit of this sampling pulse generator 9 is shown in FIG. Furthermore, a waveform diagram explaining the operation of this circuit is shown in the fifth section.
As shown in the figure. The operation of FIG. 4 will be explained using FIG. 6.

The horizontal synchronizing signal supplied from the television receiver 3 is applied to the input terminal B, and the delay "1" line 16 and the input/(- line 17)
It is said that the human power of The signal d suitably delayed by the delay circuit 16 is applied to one side of the NAND gate 18, and is connected to the output of the inverter 1 to obtain an output g. This output g is a powerful input for the NAND game 1-149.
The output f of the NAND gate 13 is NAND gated and a sampling pulse h is outputted to the output terminal C. Usually the above NA
The output f of the ND gate 13 is at a high level I, as will be described later.

Next, the flybar that also supplied TV receiver 3.

The pulse a is applied to the input terminal A and becomes an input to a differentiating circuit consisting of an inverter 11, a capacitor C1, and a resistor R1. The output of the differentiating circuit is provided as a differential output C via input terminals 12. This output c iJ RS Flynnopf 1I
Sera 1 of the Tsubu circuit 15 becomes human power, and the signal d that caused the water 3T7IL period signal mentioned above is added to the reset human power.
I'm at 1-t. Therefore, the output terminal of this RS solve flop circuit 15 receives an output 675: rj), and this output e is connected to the output of the inhark 11 by the NAND game 1.13. - and the aforementioned NANrJ game 1-1
4 can be added as a one-person effort.

Now, if the horizontal synchronization signal disappears for some reason ((
Since there is no signal in human power, the output signal e] Y% + i level (().
is at a low level, and the extraction pulse h is at a high level, so that the video period of the composite video signal is extracted.

It is well known that the flyhack pulse a is a pulse that is always generated and is a pulse that rises below the horizontal synchronizing signal.

Normally, the 1-1 period of the horizontal synchronization signal of the composite video signal is extracted, and if the horizontal synchronization is lost due to some kind of peak (for example, a ghost or a weak electric field), the video (image period) is extracted. If the horizontal synchronizing signal is missing, it can be detected as a bad image condition.The waveform of the noise detection output J is shown in FIG.

As J Hobet said, the present invention has more benefits than the effects of the invention.
1j) Operation of the indoor antenna that was a shift flight, for example, when you select a channel with /, V
1) It is a very convenient and valuable device because it can be used to operate any antenna indoors.

Water in the composite video signal for detection of 4/1' images (, Q / "Extracting the is component -") Central Kushi (72, water ゛ (' Same! When Ji Istan bow is missing (d, excluding the video period 1.lQ, Rusama VCj, T 4. Therefore, it is possible to perform stable detection without malfunctions.
l, VC1 circuit 1? ! The j section is also a gate circuit and is mostly on the left side of the row.
・I [I [martyrdomed] even in the dei bl"+'j conversion.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a conventional indoor antenna, Fig. 2 is an overall block diagram of an automatic directivity converter antenna device according to an embodiment of the present invention, and Fig. 3 is a front view of an example of a conventional indoor antenna. A block diagram of the noise detection circuit in this device, qr; Figure 4 is a specific circuit diagram of the extraction pulse generation 4-1 = circuit in this device; Figure 5 is a waveform diagram for explaining the operation of the circuit in Figure 4;
FIG. 6 is a waveform diagram for the operation of the circuit in FIG. 3) for j5+: light. 1... Antery element, 2... Switching circuit, 3... Television receiver, 4... Noise detection circuit, 5... Best point detection Circuit, 6...
Control circuit, 7... Reset circuit, 8... Sampling amplifier, 9... Sampling pulse generator. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 4
Figure 51 (branch) 1st death period opening 12H, 3ync, arrow number 2l - Figure 6

Claims (1)

[Claims] A first means having a plurality of antenna elements and switching combinations of these antenna elements, a second means for supplying the output of the first means to a television receiver, and a second means for detecting the presence or absence of a horizontal synchronization signal. 3, a fourth means for extracting the noise component in the horizontal synchronizing signal period of the composite image signal of the television receiver when there is a horizontal synchronizing signal, and a fourth means for extracting the noise component during the horizontal synchronizing signal period of the composite image signal of the television receiver when there is no horizontal synchronizing signal, and A combination of a fifth means for extracting a signal, a sixth means for detecting a minimum point of the magnitude of the sampled output signal outputted from the fourth means and the fifth means, and the plurality of antenna elements. a seventh means for controlling; an eighth means for controlling the seventh control means using the minimum point detection output; and restarting the operations of the first to eighth means each time a channel change is detected. An automatic directivity switching antenna device having means.