JPS62116090A - Television signal transmitter - Google Patents

Abstract

PURPOSE:To transmit individual information without damaging a presently receiving broadcasting by displaying the information only on a receiver of a specific terminal equipment requiring the information in equipment for transmitting a television broadcasting signal by the use of a common antenna audo- visual equipment. CONSTITUTION:In a central device 2, a demodulator 38 demodulates the television broadcasting signal received at present by the specific terminal equipment 4 to a base band signal. A telop device 36 superimposes an information signal transmitted to the specific terminal equipment on this base band signal, this superimposed signal is modulated to a signal of a channel different from the channel of the television broadcasting signal received by the terminal equipment 4 at present by a demodulator 40 and transmitted to the respective terminal equipments. An address signal of the specific terminal equipment 4 and a receipt instruction signal of the different channel are transmitted to the specific terminal equipment 4. In the respective terminal equipments, when the transmitted address signal coincides with an address assigned to its own, the receipt instruction signal is supplied to a converter 18 and the converter converts the different channel signal to a certain channel signal and supplies to a television receiver.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for transmitting television broadcast signals using a communal viewing device.

<Prior art> Conventionally, as a device for transmitting television broadcast signals,
For example, there are systems that transmit pay television broadcast signals in hotels and the like. Now, the general television broadcast signal from the broadcasting station received by the antenna and the multiple pay television and 1-sho transmission signals from the VTR etc. are mixed at the head end, and the transmission line of the communal viewing equipment is connected. It is supplied to terminal devices connected to television receivers in each room. Then, the central device calls each terminal device in turn, and when the called terminal device is receiving a pay television signal, it transmits to the central device which pay television signal it is receiving. Accordingly, the central device calculates the fee for receiving pay television.

<Problems to be solved by the invention> By the way, in hotels, etc., guests in each room are asked to come to the front desk because they have someone to visit, or they have received a message and want them to come to the front desk. Sometimes it is necessary to communicate information. In such cases, conventionally, a telephone call was made to the guest's room to provide information, but this would interfere with the guest's ability to watch television if he or she was watching it. Therefore, it is possible to display information on the television receiver, but with the above-mentioned device, it is possible to know that the TV is being watched in the room where the information needs to be sent, but it is possible to display information on the television receiver. I just couldn't send the information.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device that can transmit specific information only to a television receiver in a specific room without substantially damaging the broadcast that is currently being viewed.

Means for Solving the Problems The present invention has one central device and a plurality of terminal devices, each of which is assigned a different address.

In the central device, a demodulation means demodulates the television broadcast signal currently being received by a specific terminal device into a baseband signal. A superimposing means superimposes an information signal to be transmitted to the specific terminal device on this baseband signal. A modulating means modulates this superimposed signal into a signal of a channel different from the channel of the television broadcast signal currently being received by the above-mentioned specific terminal device, and transmits the modulated signal to each terminal device. Then, the address signal of the specific terminal device that should receive the different channel is transmitted to the different channel.

On the other hand, each terminal device converts the received television broadcast signal into a channel formed by a converter and supplies it to the television receiver. Further, a determining means determines whether the transmitted address signal matches the address assigned to itself. If they match, a reception instruction signal is supplied to the converter, and the converter converts the different channel signals into different channel signals and supplies them to the television receiver.

Therefore, a specific terminal device can receive individual information with almost no loss of the same content that it has been receiving up to now.

<Example> This example has one central device 2 and a plurality of terminal devices 4, as shown in FIG. The central device 2 is installed, for example, at the front desk of a hotel, and each terminal device 4 is installed in each room of the hotel.

The central device 2 and each terminal device 4 are connected via a transmission path 6 for a joint viewing device.

The central device 2 divides the output signal from the head end 8 into two parts using a distributor 10 and supplies one of the divided outputs to the transmission line 6 via the mixer 12 . The output signal from the head end 8 is a mixture of general television broadcast signals from each broadcast station received by the antenna 14 and pay television broadcast signals from a VTR (not shown) or the like.

The output signal from the head end 8 supplied to the transmission line 6 is supplied to the PLL converter 18 via the duplexer 16 in each terminal device 4 . The PLL converter 18 selects the television broadcast signal of the channel specified by the CPU 20 from among the supplied television broadcast signals, converts it into a television signal of a predetermined channel, and transmits the selected television broadcast signal to the television receiver ( (not shown). Therefore, the television signal supplied to one television receiver is always the television signal of a predetermined channel even if the content changes. Occur.

The control device 24 of the central device 20 sequentially supplies address signals representing different addresses assigned to each terminal device 4 to the FSK transmitter 26. The FSK transmitter 26 frequency shift modulates these address signals and supplies the frequency shift signals to each terminal device 4 via the mixing section 12 and the transmission line 6.

In each terminal device 4, the supplied frequency-shifted signal is supplied to the receiver 2 via the demultiplexer 6, where it is demodulated into an address signal and supplied to the CP[ ] 20.

The CPU 20 determines whether the demodulated address signal matches the address set by the tip switch 30 (this differs depending on each terminal device 4), and if they match, it selects the address currently selected by the PLL converter 18. A signal representative of the channel being played is provided to transmitter 32. The transmitter 32 supplies the supplied signal as a data signal to the control device 24 via the transmission path 6 and the mixer 12. If the supplied signal represents a pay television broadcast signal, the control device 24 calculates the fee, and displays on a display (not shown) K which television broadcast signal is selected by each terminal device. Display. The control device 24 then supplies the next address signal to the F'SK transmitter 26, and operates in the same manner.

In this state, if you want to convey a special message to a room, a drawing depicting this message is sent to the imaging device 3.
4 and supplies the video signal to the telop device 36.

On the other hand, check the television broadcast signal selected by the terminal device 4 in the room on the display, and press the keyboard (not shown).
provides a signal representative of the television signal to controller 24.

Thereby, the control device 24 instructs the demodulator 3 to select the designated television broadcast signal from the headend output distributed from the distributor 1O.

The demodulator 38 demodulates the selected television broadcast signal into a baseband signal, 7-r:! It is supplied to the tube device 36. The telop device 36 superimposes the baseband signal from the demodulator 38 and the imaging signal from the image pickup device 34, and supplies the superimposed signal to the modulator 4o. modulator 4o
converts this superimposed signal into a television broadcast signal of a different channel from each television broadcast signal from the head end 8 and supplies it to each terminal device 4 via the mixing section 12 and the transmission line 6. At the same time, the controller 24 controls the modulator 4
A terminal device 4 that should receive a television broadcast signal from o
and a signal representing the channel of the television broadcast signal from the modulator 4o are supplied to the FSK transmitter 26. The F'SK transmitter 26 frequency-shift modulates these supplied signals and supplies them to each terminal device 4 via the transmission line 6 from the mixer 12.

In each terminal device 4, the frequency shift signal from the F'SK transmitter 26 is demodulated into an address signal and a channel display signal by the receiver, and the demodulated signals are supplied to the CPU 20. CP (J20 (matches only the specific terminal device 4), CPU
20 supplies a channel indication signal to the PLL converter 18. Thereby, the PLL converter 18 converts the television broadcast signal from the modulator 40 into a television broadcast signal of a predetermined channel and supplies the converted television broadcast signal. The television broadcast signal from the modulator 40 is transmitted to a specific terminal device 4.
Since the image signal of the screen imaged by the imaging device 34 is superimposed as a telop on the television broadcast signal selected so far, the television receiver connected to the specific terminal device 4 is currently Text information can be displayed without compromising the television broadcasts that were previously received.

In the above embodiment, specific information is displayed in text, but the audio signal of the television broadcast signal that has been received so far is removed so that only one sound representing the specific information is emitted. However, if a plurality of demodulators, telop devices, and modulators are provided as shown in FIG. 2, different information can be transmitted to different terminal devices 4.

Effects/Effects> As described above, according to the present invention, individual information can be transmitted only to a specific terminal device without damaging the broadcast currently being received.

[Brief explanation of drawings]

FIG. 1 is a 1072 diagram of one embodiment of a television broadcast signal transmission device according to the present invention, and FIG. 2 is a block diagram of a part of another embodiment of the same device. 2... Central device, 4... Terminal device. Patent applicant: Diex Antenna Co., Ltd. Representative: Satoshi Shimizu and 2 other famous paintings 1 Figure

Claims (1)

[Claims] (1) Consisting of one central device and a plurality of terminal devices to which different addresses are assigned, the central device has means for sending television broadcast signals of different channels to each of the terminal devices. , means for demodulating a television broadcast signal selected by a specific one of the terminal devices into a baseband signal, an information signal representing information to be transmitted to the specific terminal device, and the baseband signal. a modulating means for modulating the output signal of the superimposing means into a television broadcast signal of a channel different from the television broadcast signal being received by the specific device, and transmitting the same to each of the terminal devices. and a control means for supplying to each of the terminal devices an address signal representing an address assigned to the specific terminal device, and an instruction signal of a television broadcast signal of the different channel, and each of the terminal devices includes: means for selecting any one of the television broadcast signals from the transmitting means and converting it into a television broadcast signal of a predetermined channel; means for receiving the address signal and the instruction signal; determination means for causing the conversion means to convert the output signal of the modulation means into a television signal of the predetermined channel based on the instruction signal received when the address signal matches the address assigned to the self; Television signal transmission equipment.