JPH0342917A - antenna receiving device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an antenna receiving device for receiving television broadcasts used in video tape recorders (hereinafter referred to as VTRs) and the like.

BACKGROUND TECHNOLOGY In general, antenna receiving devices used in VTRs are
It consists of TV lines, VTR lines, and a distributor.

Recently, the VHF band and tTHF band of television broadcasting are
The receiver side has a single axis (single axis).

Since many of these antenna receiving devices are still old-fashioned (double antennas in which VHF and Yamanaka F are separated), it is necessary to use a mixer and a duplexer. Therefore, insertion loss due to their use was unavoidable.

Therefore, in areas where the electric field strength of television broadcasting is weak, a one-stone booster is used to increase the level of the received signal, thereby reducing noise in the video signal on the television receiver.

FIG. 3 is a block diagram showing a conventional example of an antenna receiving device for a VTR.

In FIG. 3, 1 is an antenna input terminal that supplies a signal received by an outdoor receiving antenna.

2 is a distribution transformer, which distributes the signal to the direct supply to the television receiver and the tuner input to the demodulator on the VTR side. 3
is the TV/VTR mode changeover switch TR3W. 4 an RF converter; 5 an antenna output terminal for cable connection to a television receiver; 6 an output terminal for supplying a signal as a tuner input to a VTR demodulator; 7
is the power supply terminal for switching between TV and VTR modes, 8ba1
A power supply terminal for a stone booster, 9 is an antenna receiving section consisting of components 1 to 8, and 10 is a one stone booster.

FIG. 4 is an external view of a commercially available one-stone booster.

The button 11 in FIG. 4 is a booster power supply terminal, which is connected to the terminal 8 of the antenna receiving section 9 in FIG. 1
Reference numeral 2 denotes an antenna output terminal, which is connected to terminal 1 of the antenna receiving section 9 in FIG.

13 is an antenna input terminal for inputting a received signal from an outdoor receiving antenna, 14 is inserted into a guide provided on the antenna terminal board (described later) on the VTR side, and is connected to the one-stone booster 1o.
This is a dowel to prevent rotation.

FIG. 6 is an assembly diagram of the antenna terminal plate.

In FIG. 6, 10 is a one-stone booster, and 9 is an antenna receiving section that receives signals received outdoors directly or via the one-stone booster 1o. Reference numeral 16 denotes an antenna terminal plate (a molded product) provided on the VTR side, and the antenna receiving section 9 and the one-stone booster 10 are inserted into the antenna terminal plate 15 from the direction of the arrow and assembled into one unit.

8a is a lead wire for supplying power to the single-stone booster 10, and is attached to the antenna terminal plate 16. The antenna reception section 9 may be a combination of a reception section and an RF converter, a combination of a tuner section and a reception section, or a single reception section.

Problems to be Solved by the Invention However, the antenna input for the VHF band and medium F band is
If the signal is axially oriented, it is necessary to use a mixer before entering the input of the antenna receiver. Also, when connecting the antenna output terminal of the antenna receiving section to a television receiver, it is necessary to use a duplexer if the antenna input of the television receiver is an old model antenna terminal board that is separated into VHF and IJHF. there were. Therefore, when these mixers and duplexers are used, there is a problem that insertion loss occurs.

Furthermore, in consideration of the thinner and smaller size of VTRs, the consolidation of circuits, etc., there has been a problem in that the power supply terminals that are supplied from the antenna receiving section to the single booster are complicated and cannot be consolidated.

Means for Solving the Problems In order to solve the above problems, the present invention adds an attenuator, an amplifier, and an off-sle compatible filter to conventional components as new components.

That is, the antenna receiving device of the present invention includes an attenuator that attenuates or passes an antenna reception signal, an amplifier that amplifies the output when the attenuator is passing through, and a filter that off-throughs the output when the attenuator is attenuating. and a distribution transformer which receives the outputs of the amplifier and the filter as inputs and distributes the inputs to a television receiver or a VTR demodulator.

Effect of the present invention With the above-described configuration, the internal state of the attenuator is switched according to the electric field strength of the reception area, and by using an amplifier and a filter, the present invention can be used to control the mixer, the branching filter, and even the antenna receiving section. The loss caused by the distribution transformer etc. can be easily compensated for.

Embodiments Hereinafter, antenna receiving apparatuses according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an antenna receiving device in an embodiment of the present invention.

In FIG. 1, an antenna receiving section 19 corresponds to the antenna receiving section 9 of the conventional example shown in FIG. 3, and the same components are denoted by the same reference numerals and their explanations will be omitted. The difference in configuration is
An attenuator 16 is provided between the antenna input terminal 1 and the distribution transformer 2. This is because an amplifier 17 and an off-switch filter 18 are provided. A received signal from the antenna input terminal 1 is input to an attenuator 16, and its output is input to an amplifier 17 and an off-sle corresponding filter 18. The inputs and outputs of the amplifier 17 and the off-sle corresponding eye 18 are connected to each other, and the output thereof is used as an input to the distribution transformer 2.

FIG. 2 is a circuit diagram showing a specific example of the attenuator 16, which includes a slide switch 16a and a damping resistor 1.
ab and 1ea, and a damping resistor 16b is connected between the common terminal and the upper terminal of the slide switch 161L,
The upper terminal is connected to the antenna input terminal 1. The damping resistor 160 has one end connected to the lower terminal of the slide switch 16&, and the other end connected to the ground side. Then, connect the common terminal of the slide switch 161L to the next stage amplifier 17.
It is connected to a fill 18 corresponding to the button and the off-seal. The slide switch 161L of the attenuator 16 is switched in the arrow (up) direction in a weak electric field area, and after the received signal is amplified by the amplifier 17, the received signal is transmitted to the distribution transformer 2 at the next stage. Also, in strong electric field areas, the signal is switched in the direction of the arrow (down), and in strong electric field areas, the attenuation resistor is activated to enable reception at the best reception level. The received signal is then transmitted to the next-stage distribution transformer 2 via the off-sle corresponding filter I8.

Effects of the Invention As described above, according to the present invention, by providing an attenuator, an amplifier, and a fill corresponding to the off-switch, the loss of the mixer 1 demultiplexer and the distribution transformer can be reliably compensated for, and the best reception condition can be achieved. This also makes it possible to reduce the V of the antenna receiving device.
Frequency characteristics in the HF and UHF bands can also be easily guaranteed. Furthermore, the structure of the antenna terminal plate becomes simpler, which has great effects.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an antenna receiving device according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing a specific example of an attenuator applied to the same embodiment, and FIG. 3 is a block diagram of a conventional antenna receiving device. Figure 4 is an external view of the one-stone booster, and Figure 6 is an assembly diagram of the antenna terminal plate. 1... Antenna input terminal, 2... Distribution transformer, 16... Attenuator, 17...
Amplifier, 18...Off-sle-compatible filter, 1
9...Antenna receiving section.

Claims (1)

[Claims] an attenuator that attenuates or passes an antenna reception signal; an amplifier that amplifies the output when the attenuator passes; a filter that turns off the output when the attenuator is attenuating; and an attenuator that attenuates or passes the antenna reception signal; An antenna receiving device comprising a distribution transformer that serves as an input and distributes the input to a television receiver or a VTR demodulator.