JPS62107584A - Television signal transmission equipment - Google Patents

Abstract

PURPOSE:To reduce the number of VTRs to be installed by supplying video signals from the beginning of contents only to a room requesting a video signal and employing a transmission line for a community TV receiving system. CONSTITUTION:If some room requests broadcasting of specific videos, a front desk sets a requested video tape to a VTR 10b, and instructs a CPU 18 to operate the VTR 10b and gives the address of a terminal equipment in the room through a keyboard 22. The CPU 18 operates the VTR 10b, and simultaneously supplies an address signal and a channel designation signal to an FSK transmitter 20. From the address signal and the channel signal, the FSK transmitter 20 deviates and modulates frequency, and supplies it to each terminal equipment through a mixing part 26 and the transmission line 26 for community TV receiving system.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a device for transmitting different television signals to different rooms of a hotel, for example.

<Prior Art> Conventionally, each room of a hotel or the like receives a television signal other than the television signal transmitted from a broadcasting station, a so-called pay television signal. In such a case, the transmission of the video signal from the VTR is started at a predetermined time using the transmission line of the communal viewing device, so that when the guests in the same room try to watch pay TV.

The transmission may not have started yet, or it may have already started.

One technique to solve this problem is to set up a VTll for the number of rooms and the number of times at the front desk.
It is conceivable to connect I' (to the television receiver in each room using separate lines, respectively, and to activate the VTIt corresponding to that room each time a request is made to the front desk from each room.

<Problems to be Solved by the Invention> However, this technique has a problem in that a large number of VTI'Ls are required. That is, in general, the probability that a request to operate a VTR will come from every room is very low, but with this technology, each VTR is required to operate.

If the TV receivers in each room are connected to each other, the video cannot be transmitted from the beginning when a request is made from each room, so the operating rate is low.
VTRs of the same voltage as the number of rooms had to be prepared, which increased the cost. Moreover, since each VTR must be connected to the television receiver in each room, it is not possible to use the transmission line of the communal viewing equipment, and the wiring must be installed separately. In addition to being troublesome to wire,
Costs were rising.

Means for Solving Problems> The present invention includes a central device installed, for example, at the front desk, and a plurality of terminal devices installed, for example, in each room.

The central device includes a plurality of television signal sources each capable of transmitting television signals of different frequencies, and address transmitting means for transmitting an address signal representing the destination of each of these television signals.

Each terminal device is assigned a different address. Then, when the transmitted address signal matches the address assigned to itself, each terminal device selects the television signal corresponding to the address signal.

<Operation> According to the present invention, when a request is made to a guest in a room or the front desk to transmit a specific television signal, the television signal generation source transmits that specific television signal, and The address transmitting means sends out an address signal of the room consisting of the room. Each terminal device determines whether the transmitted address signal matches its own address, but only the terminal devices in the same room do. Thus, the terminals in the room select a particular television signal.

<Embodiment> This embodiment has a central device 2 and each terminal device 4, as shown in FIG. The central device 2 is installed, for example, at the front desk, and each terminal device 4 is installed in each room.

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

The central device 2 includes a center device 8 and a plurality of devices 1, for example, 16
It has 10 VTRs, 10a to 10p. These VTRs
Of 1na to 1op, only those that are supplied with a drive signal from the center device 8 operate and supply a video signal to the modulator 12. When the modulator 12 receives a video signal from the VTR 10a, it transmits the A channel signal, and when it receives the video signal from the VTR 10b, it transmits the A channel signal.
Now, the P channel signal is...
When the video signal is supplied from TR and Lop, this will cause P
The signals of the channels are each modulated to generate a pay television signal. These pay television signals are mixed at head end 14 with general television broadcast signals from broadcast stations received by antenna 16 . In addition,
A to P channels.

For example, the selection is made from a midband between channels 3 and 4.

The center device 8 includes a CPU 1a as shown in FIG.
, PSK transmitter 20. Keyboard 22 and comparator 24
has. The keyboard 22 provides VT for the CPU 18.
It instructs which of R1Oa to lop is to be activated and to which terminal device 4 the video signal of the VTR whose operation history is set to 1 is to be supplied. According to this instruction, the CPU 18 supplies the drive-1 signal to the instructed VTII, and also
"Terminal device 4 that should supply a video signal to the SK transmitter 20
and a channel designation signal that indicates from which VTR the video signal is being supplied, that is, how many channels should be received.

Further, when a VTR end signal is supplied, this and an address signal are supplied to the FSK transmitter 20. F.S.
When the K transmitter 20 is supplied with the address signal and the channel signal, it transmits a signal that is frequency shift modulated with one word at a lower frequency than the general television signal and each channel signal, and When supplied with the address signal and the VTR end signal i-'/4, it similarly sends out a frequency shift signal. This modulated signal and the signal from the head end 14 are mixed in a mixer 26 and supplied to each terminal device 4 via the transmission line 6 of the communal viewing device. When the DC voltage supplied from the terminal device 4 through the transmission path 6 and the mixing section 26 of the communal viewing device is at L level, the comparator 24 supplies an output signal of level (1) to the CPU 18.

Each JM terminal device 4 has a duplexer 28, respectively. As shown in FIG. 3, this lI'1 waver 28 includes a bypass filter 32 for supplying only the output signal from the head end 14 to the 2-way splitter 30, and a bypass filter 32 for supplying only the output signal from the head end 14 to the 2-way splitter 30, and a bypass filter 32 for supplying only the frequency-shifted signal from the center device 8. It has a bandpass filter 34 for supplying the receiver 33 and a lowpass filter 38 for supplying the DC signal from the transmitter 36 to the central unit 2.

2 splitter 30 is a head end 1 extracted by the splitter 28.
4 output signal to PLL converter 3f? and amp 40
and distribute.

The receiver 33 demodulates the address signal and the channel instruction signal from the frequency shift signal extracted by the 1-wavelength splitter 28 and outputs the CI
) is supplied to U42.

CPrJ42 occurs when the address assigned to this terminal device 4 by the DIP switch 44 and the address signal output by the receiver 33 almost match.

A relay 48 interposed between the output side of the amplifier 40, the output side of the PLL converter 3q, and the television receiver 46.
is switched to the state where it is connected to the output side of the amplifier 40 or the television receiver 46, and the I) L L converter 3q is controlled to be in a stopped state. Also, CI)1. J4
2, the demodulated address signal and the dip switch 4
When the addresses from 4 and 4 match, the relay 48 is turned off so that the output side of the PLL converter 39 is connected to the television receiver 4, the pr, r and converter 39 are activated, and the PLL converter 39 is connected to the television receiver 4. 39, the PLL converter 3θ is controlled to convert the pay television signal of the channel designated by the channel instruction signal into the television signal of a predetermined specific channel, and the transmitter 36 is operated.

The transmitter 36 uses an NPN transistor 50 as shown in FIG. 4, and when the output signal U1 is supplied to the final base, the L level voltage is sent to the duplexer 28, the transmission line 6 for the communal listening and viewing equipment 6. The comparator 2 of the center device 8 via the mixing section 26
4.

According to this embodiment, for example, when a guest in a certain room requests the front desk to broadcast a specific video, the front desk broadcasts an empty VTII, for example, VTII.
Play the requested video or recorded videotape on TR, 101). Then press CP on keyboard 22.
U] 8 to operate the VTR 1ob and the address assigned to the terminal device 4 in the room that requested the video. By this, CPU18
[VTR, 10b, together with the operating cell, supplies address signals and channel indication signals to the F'SK transmitter 20. The video signal from the VTRlob is modulated into a B channel signal by the modulator 12, and this B channel modulated signal is mixed with the general television signal and other channel signals already sent from the modulator 12 via the head end 14. Part 2 will be supplied.

Further, the FSK transmitter 20 performs frequency shift modulation on the address signal and the channel signal, and supplies this frequency shift signal to the mixer 2. The mixing unit 26 mixes the B channel signal and the frequency shift signal, and supplies this mixed signal to each terminal device 4 via the communal viewing device transmission line 6.

In each terminal device 4, a branching filter 28 supplies a B channel modulated signal, a general television signal, and other channel signals to a two-way splitter 30. Further, the 1-wavelength divider 28 extracts the frequency shift signal and supplies it to the receiver 33 .

The receiver 33 demodulates an address signal and a channel designation signal from this frequency shift signal and supplies them to the CPU 42. The CPU 42 determines whether the demodulated address signal matches the address given by the dip switch 44, or the CPU 42 in the room that issued the request switches the relay 48 to output the output a+ of the p r, r, converter 3q, It is connected to the television receiver 46, and the L/L converter 38 is operated to select channel 11 according to the channel instruction signal 5 and convert it to a predetermined channel. As a result, you can watch the requested video from the beginning on the television receiver in the room where the request was made (elements 46).

The CPU 42 operates the transmitter 36 to provide an L level voltage to the comparator 24 of the center device 8 . This causes the comparator 24 to output 1. Give an I level signal to the CPU 18.

Based on this, the CPU 18 confirms that the video has definitely been supplied to the terminal device 4 in the requested room.

Of the terminal devices 4 in the room whose addresses match each other, if the terminal device 4 receives a general television signal, the relay 48 connects the output side of the amplifier 40 to the television receiver 46.
Since the connection is maintained, the reception of general television signals continues. Also.

In the terminal device 4 in the room that has already issued a request for another video, the relay 4a connects the PLL converter 3q to the television receiver 46, but the CPU 42 changes the selected channel to the PLL converter. Since no instructions are given to 3q, reception of the video currently being received continues.

When the requested video is finished, the CP of the center device 8
U18 supplies the FSK transmitter 20 with an address signal and a video end instruction signal. These signals are supplied to the terminal device 4 in the requested room in the same manner as described above, and C
PrJ42 stops the PLL converter 3θ and switches the relay 48 so that it can receive a general television broadcast signal.

In the above embodiments, a VTI't was used, or a video disc could also be used. In addition, a general television signal may also be transmitted at the same time, but it is not necessary to transmit it. Further, although the relay circuit 48 is used, a mixing section may be used instead.

In that case, you can also receive general television signals by switching channels.

Effects> As described above, according to the present invention, it is possible to supply a video signal only to the requested room from the beginning of the content, and moreover, it is possible to supply the video signal from the beginning of the content only to the room that has requested it, and moreover, it is possible to supply the video signal only to the room where the request is made, and moreover, it is possible to supply the video signal from the beginning of the content, and moreover, it is possible to supply the video signal only to the room where the request is made. Therefore, it is necessary to prepare as many VTRs as there are rooms, and to connect these to the television receivers in each room. Therefore, special wiring is not required, and there is almost no request to stream video from all rooms at the same time, so VT
The number of installation stands t for R can be reduced, and costs can be lowered.

[Brief explanation of drawings]

FIG. 1 shows one of the television signal transmission devices according to the present invention.
FIG. 2 is a block diagram of the center device of the embodiment, FIG. 3 is a block diagram of the duplexer of the embodiment, and FIG. 4 is a circuit diagram of the transmitter of the embodiment. . 2... Central device, 4... Terminal device, 6... Address signal sending means, LOA to 10P, and 12... Television signal generation source.

Claims (1)

[Claims] (1) A central unit including a plurality of television signal generation sources each capable of transmitting television signals of different frequencies, and means for transmitting address signals representing the destination of each of these television signals, each having a different address. What is claimed is: 1. A television signal transmission device comprising: a plurality of terminal devices which select a television signal corresponding to the address signal when the transmitted address signal matches the address assigned to the terminal device.