JPS63227221A - Wireless remote control type booster - Google Patents

Abstract

PURPOSE:To improve reception status, by controlling a reception circuit for remote control, and a display circuit which displays the desired channel of a reception television and a desired channel to be transmitted to a room, etc. CONSTITUTION:When a user uses a portable television, the transmission channel of a booster is designated in advance, and when the user watches the television, reception is performed by fitting the reception channel of the portable television to the transmission channel. Therefore, since a selection TV channel desired by the user is frequency-converted to a vacant channel by a tuner 105, and an RF converter 106, no influence of an existing wave and wave interference is given. Also, by using a rod antenna as a transmission antenna 108 for customer, the length of the antenna can be adjusted corresponding to the wave of a transmission frequency, thereby, directivity, etc., can be also adjusted, and the appropriate setting of the booster based on an arranging position in a residence can be realized. In such a way, it is possible to perform gain control only for a desired channel, and to improve picture quality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television booster with an indoor transmitting antenna for improving the reception of a portable television indoors.

[Conventional technology]

In general, the electric field strength of TV radio waves is very low indoors, especially in buildings with concrete walls, so TV radio waves are received using a directional antenna such as a Yagi antenna on top of a ridge. Get the TV screen by connecting to the antenna input terminal of the indoor TV via. If this still does not provide sufficient picture quality, a booster, which is an RF signal amplifier, is connected between the television and the antenna to improve the reception level.

[Problem that the invention seeks to solve]

Picture quality can be improved with a general booster, but in this case, the output of the booster is directly connected based on impedance matching, as in a stationary TV. It is not effective for recent small tabletop televisions, especially those that do not require direct connection to an antenna terminal wired in the house, such as liquid crystal mobile televisions.

An object of the present invention is to provide a device that allows a user of a small portable television to satisfactorily receive radio waves and enjoy television anywhere in the house without having to connect it to a television antenna terminal.

The reason why the reception of small portable televisions in the house is poor is that the electric field strength of the television radio wave band in the house is low, resulting in a poor S/N ratio, so even if the receiving sensitivity of the television receiver is increased, the image quality cannot be expected to improve much. On the other hand, if radio waves with a good SIN ratio exist within the home, the reception of television will improve.

However, various problems arise if radio waves are received outdoors using a highly sensitive directional antenna, amplified, and then simply retransmitted using a transmitting antenna inside the home. Firstly, there are negative effects due to interference between existing radio waves and boosted radio waves. Second, if the amplification rate of the booster is increased too much, the output of channels with high electric field strength will be saturated, and this will cause waveform distortion of other channel signals, deteriorating the screen quality. Thirdly, since television channel bands range widely from VHF to UIF, it is difficult to transmit efficiently using only a few transmitting antennas, which have a close relationship with wavelength. It is a substantial objective of the present invention to overcome the above problems, and the means therefor will be explained in detail below.

[Means for solving problems]

The system configuration of the present invention will be explained.

an auto tuner that inputs an RF flaw signal received by an outdoor antenna and sent via a coaxial cable or feeder line, selects a desired channel frequency band from the RF flaw signal, performs frequency conversion, and outputs an intermediate frequency signal; R that performs frequency conversion of the tuner output to a desired RF frequency band different from the channel frequency band selected by the tuner.
An F converter, an amplifier that adjusts the gain of the output and connects the output to an indoor transmitting antenna, a remote control receiving circuit that receives information sent from an external remote control transmitter, and a desired receiving TV channel and an indoor transmitter. an electro-optical display device that displays a desired channel to transmit, etc.;
A wireless remote control booster was constructed by a power supply circuit that converts AC power into the necessary DC voltage, and a control circuit that controls the tuner, RF converter, amplifier, remote control receiving circuit, display circuit, and power supply circuit.

[Effect]

In the system of the present invention, when a user uses a mobile TV, he/she specifies in advance the transmission channel of the booster of the present invention (an empty channel allocated to a frequency in the user's area, for example, channel 2) and watches the TV. At this time, the reception channel of the mobile TV is tuned to the transmission channel.

Therefore, since the selected TV channel desired by the user is frequency-converted to an available channel by the tuner and RF converter, radio wave interference with existing radio waves is hardly a problem.

In addition, by using a rod antenna as the indoor transmitting antenna, the antenna length can be adjusted according to the wavelength of the transmitting frequency, so the directivity etc. can also be adjusted, making it possible to make appropriate settings depending on the location of the booster in the house. Moreover, since this system is a small-scale system, there is no need to worry about interference with existing radio waves.

It goes without saying that the maximum transmission output must be designed within the Radio Law.

Even if you select a channel with a low electric field strength, even if there is a channel with a high electric field strength, you can convert the frequency and increase the gain independently of those channels, so you can adjust the gain of only the desired channel without saturation phenomenon and improve image quality. improvement can be obtained.

The setting of the receiving channel, the transmitting channel, the transmitting level, and the ON10FF control of the power supply for node x are controlled by a remote control transmitter, and the electro-optical display notifies the user of the setting status, making it easy to use.

〔Example〕

Embodiments of the present invention will be described below with reference to FIG.

Reference numeral 101 is a remote control transmitter using infrared rays, which controls the TV channel the user wants to watch, the TV channel the user wants to transmit to the home, adjustment of the transmission output, and turning on/off the power saving switch of the power supply. 102 is a remote control receiving circuit that converts the signal from the remote control transmitter 101 into a digital signal and transfers it to the control circuit 106. Control circuit 1
06 controls each block in the booster according to the user's remote control settings, and is composed of, for example, an L-chip microcomputer. A distributor 104 divides the input RF signal into two or more signals, one for inside the booster and one for external equipment. If it is assumed that an external distributor is used, the distributor 104 can be omitted. An auto tuner 105 is a circuit that selects a television channel band desired by the user from a remote control transmitter and converts it into an intermediate frequency signal. For example, P
Built-in LL digital tuning system,
The control circuit 1 sets the programmable frequency divider therein.
03 will do it. Naturally, necessary high-frequency amplifiers, filters, etc. are also included. 106 is an RF converter that converts the selected television signal into an output television channel band desired by the user.

Normally, in the chainer, the local oscillation frequency is set to 5'8.75 MHz higher than the desired television channel band, more precisely than the video carrier frequency, and the resulting difference component is the intermediate frequency signal. Spectrum is input RF
Inverts the signal on the frequency axis. Therefore, in the RF converter 106, by setting the local oscillation frequency higher than the intermediate frequency by the video carrier frequency on the transmission television frequency band desired by the user, the mixed output of the local oscillation signal and the intermediate frequency signal can be adjusted. The spectrum of the difference component is inverted again and has the same relationship on the frequency axis as the RF signal spectrum that is the input to the auto tuner 105, which is equivalent to the TV channel band you want to select moving parallel to the TV channel band you want to transmit. becomes.

The local oscillation frequency within the RF converter is switched by a control circuit, but since an unused TV channel band in the user's area is usually selected, once it is set, it is semi-fixed.

Therefore, once the length, direction, etc. of the transmitting antenna are optimally adjusted for the output channel band, there is almost no need for re-argument. The larger the number of local oscillation frequencies that can be switched in the RF converter, the more convenient it is, but considering the number of components such as filters, the smaller the better, and 4-channel frequency would be sufficient.

Reference numeral 107 is an RF signal variable amplifier that can be controlled by the control circuit 106 and adjusts the output of the transmitting antenna 108 .

Since the electric field strength of the radio waves transmitted from the rod antenna varies greatly depending on the distance, the user can use the remote control to adjust the image quality each time while watching a portable television. Of course, this is within the range stipulated by the Radio Law.

109 is the reception channel, transmission channel, and power ON.
The device is an electro-optical display circuit such as an LED that displays 10FF, etc., and is a device that informs the user of the current setting, and is controlled by a control circuit 106.

Reference numeral 110 denotes a power supply circuit including an AC-DC converter, which converts, for example, 100V alternating current to a direct current voltage of 5V, ±12V, etc., which is supplied to each block. When saving power, it is controlled by a control circuit, such as by stopping supply to unnecessary blocks.

When a user watches TV, if the transmission frequency band is set to channel 2, for example, the user can set the channel on the mobile TV to channel 2, and then use the remote control to set the desired channel to the booster. You can display the channel screen. If the image quality of the screen is poor, you can obtain a better screen by resetting the transmission output level using the remote control.

〔Effect of the invention〕

As is clear from the above description, it is very effective and convenient that the present invention improves in-house reception on a portable television and allows the user to easily receive desired channels almost anywhere in the room.

Since this system is a small-area system, it does not affect outdoor radio waves, and since it uses unused channel bands in the area, it does not cause radio interference. Furthermore, if a user using the booster of the present invention is in close proximity, radio wave interference can be avoided by switching the transmission channel.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a wireless remote control booster showing one embodiment of the present invention. 101...Remote control transmitter, 102...Remote control receiving circuit. 106... Control circuit, 105... Auto tuner, 106... RF converter.

Claims (1)

[Claims] An RF booster that operates on AC power has a tuner that receives an RF signal as input, automatically selects a desired reception channel frequency band from the RF signal, performs frequency conversion, and outputs an intermediate frequency signal, and a tuner that outputs an intermediate frequency signal. an RF converter that performs frequency conversion to a desired RF frequency band different from the channel frequency band selected by the tuner as an input, and an amplifier circuit that adjusts the gain of the output of the RF converter and whose output is connected to a home transmitting antenna. , an external remote control transmitter, a remote control receiving circuit that receives information sent from the external remote control transmitter, an electro-optical display device that displays a desired reception channel, a desired channel to be transmitted to the home, etc., A power supply circuit that converts power into a necessary DC voltage, and a reception channel of the tuner, a transmission channel of the RF converter, and a gain of the amplifier circuit according to information sent from the remote control transmitter via the remote control reception circuit. and a control circuit that controls display data of the display circuit and the power supply circuit.