JPH0549033A - Bs tuner built-in video equipment and bs broadcast video system - Google Patents

Abstract

PURPOSE:To connect selectively a descrambler to both BS tuner built-in video equipments and to facilitate the use by leading a BS tuner output selected by a changeover switch to the descrambler. CONSTITUTION:When a television receiver 1 and a VTR 2 are driven, both power switches SW1, SW2 are closed, and when a BS tuner 8 of the VTR 2 is in use, a changeover switch SW2 is turned to the position of a VTR terminal tv. An output signal of the BS tuner 8 is led to a JSB decoder 11, where the signal is descrambled and returned to the VTR 2 and outputted to the TV 1. When the VTR 2 only is driven, the SW3 is closed and the changeover switch SW2 is turned to the position of the terminal tv, the output signal of the BS tuner 8 is led to the JSB decoder 11 and the descrambled video and audio signal is returned to the VTR 2, then the scrambled broadcast signal is recorded. When only the TV1 is driven, the broadcast is viewed as above.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video device with a built-in BS tuner and a system for BS broadcasting suitable for viewing scrambled satellite broadcasting.

[0002]

2. Description of the Related Art Currently, BS-3ch broadcasting is scrambled, and a JSB decoder (descrambler) is required to view it.

On the other hand, a TV tuner and a VTR each having a built-in BS tuner are available on the market, and when each video equipment is used independently, it is necessary to connect the output of each BS tuner so as to pass through a JSB decoder.

[0004]

However, since the current JSB decoder has only one input terminal, it was impossible to connect it to two video equipment with a built-in BS tuner. Therefore, when watching a BS-3ch broadcast, it is always necessary to drive the BS tuner built-in video device to which the JSB decoder is connected or to reconnect the JSB decoder.

Therefore, according to the present invention, if a descrambler is connected to either one of the two video devices with a built-in BS tuner, the descrambler can be selectively connected to both video devices with a built-in BS tuner. An object is to provide a video device and a video system for BS broadcasting.

[0006]

A video device with a built-in BS tuner according to the present invention for achieving the above object has a BS tuner, and an output signal of this BS tuner and a BS tuner of another built-in video device of the BS tuner. Is provided with a selector switch for selectively switching between the output signal of the BS tuner and the BS output of the BS tuner, and the BS tuner output selected by the selector switch is guided to the descrambling device.

Further, a video system for BS broadcasting according to the present invention for attaining the above object has a first BS tuner built-in video device, a second BS tuner built-in video device and a descrambling device. A changeover switch for selectively changing the outputs of the BS tuners of both BS tuner built-in video devices is provided, and the BS tuner output selected by this changeover switch is led to the descrambler.

[0008]

When one of the video devices with the built-in BS tuner is driven and the output signal of this video device is selected by the changeover switch, the descrambler outputs the descrambled broadcast signal.

[0009]

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

FIG. 1 shows a first embodiment of the present invention. FIG. 1 shows a circuit block diagram of a video system for BS broadcasting. In FIG. 1, this system has a television 1 and a VTR 2 which are video equipment with a built-in BS tuner.

The television 1 has a built-in BS tuner 3, and the received signal of the BS antenna 4 is input to the BS tuner 3. The BS tuner 3 tunes a broadcasting signal of a desired broadcasting station by a tuning microcomputer (not shown). The output signal of the BS tuner 3 (FM detection signal (video) and bit stream signal (audio) when scrambled) is divided and supplied to the CRT 5 and the speaker 6 and is input to the VTR 2 from the output terminal t _A. It is wired so that In addition, BS tuner 3, CRT 5,
Power is supplied to the speaker 6 and the like from the power supply circuit 7, and the power supply circuit 7 supplies power to each circuit when the power switch SW ₁ is turned on.

Similarly, the VTR 2 also has a built-in BS tuner 8, and the received signal of the BS antenna 4 is also input to this BS tuner 8. The BS tuner 8 tunes a broadcasting signal of a desired broadcasting station by a tuning microcomputer (not shown) similarly to that of the television 1. The output signal (video, audio) is supplied to the recording / reproducing circuit 9. It is led to the VTR side terminal t _V of the changeover switch SW ₂ .

The changeover switch SW ₂ is a double switch.
It has a VTR side terminal t _V and a TV side terminal t _T, and an output signal of the BS tuner 3 of the television 1 is guided to the TV side terminal t _T. The changeover switch SW ₂ is configured to be manually changeable.
The output signal selected by W ₂ is connected so as to be input to the JSB decoder 11 which is a descrambler via the output terminal t _B.

The BS tuner 8, the recording / reproducing circuit 9 and the like are configured so that power is supplied from a power supply circuit 10. The power supply circuit 10 supplies power to each circuit when the power switch SW ₃ is turned on.

The JSB decoder 11 descrambles the input signal (FM detection signal, bit stream signal) from the VTR 2 and outputs the descrambled video and audio signals to the television 1 and the VTR 2, respectively. The video and audio signals input to the television 1 are CRT5
The video and audio signals input to the VTR 2 are connected to the recording / reproducing circuit 9 respectively.

In the above, the television 1 and the VTR 2
When driving both of the two, both power switches SW ₁ ,
SW ₃ is turned on. Then, for example, when the BS tuner 3 of the VTR ₂ is used, the changeover switch SW _{2 is set} to the VTR.
Connect to the side terminal t _V. Then, the output signal of the BS tuner 8 is transmitted through the changeover switch SW ₂ to the JSB decoder 11
, Is descrambled here, is returned to the VTR 2 and is output to the television 1.

When only VTR2 is driven, VTR2
Turn on the power switch SW ₃ and turn the changeover switch SW ₂ to V
Connect to the terminal t _V on the TR side. Then, the output signal of the BS tuner 8 of the VTR ₂ is sent to JS via the changeover switch SW _2.
The descrambled video and audio signals guided to the B decoder 11 are returned to the VTR 2 so that the scrambled broadcast signal can be recorded.

When only the television 1 is driven, the power switch SW ₁ of the television ₁ is turned on and the VTR 2
The changeover switch SW ₂ is connected to the TV side terminal t _T. Then, the output signal of the BS tuner 3 of the television 1 is guided to the JSB decoder 11 via the changeover switch SW ₂ .
Since the descrambled video and audio signals are returned to the television 1, the scrambled broadcast signal can be viewed.

Further, as shown by a virtual line in FIG. 1, the changeover switch SW ₂ may be changed over by a control signal of the power supply circuit 10. That is, when the power switch SW _{3 of the} VTR 2 is off, the changeover switch SW ₂ is
The V-side terminal t _T is configured such that the change-over switch SW ₂ automatically selects the VTR-side terminal t _V when the power switch SW ₃ is on. With this configuration, the television 1 and the VTR
Changeover switch SW ₂ when driving 2 independently
The JSB decoder 11 can be connected to the driving television 1 or VTR 2 without manually operating the. However, when the power switch SW _{3 of the} VTR 2 is in the on state, if the changeover switch SW ₂ can be manually operated, the scrambled broadcast signal can be viewed even by using the output signal of the BS tuner 3 of the television 1. Become.

FIG. 2 is a circuit block diagram of a BS broadcast video system showing a second embodiment of the present invention. In FIG. 2, the second embodiment is an example having a changeover switch SW ₂ on the side of the television 1 contrary to the first embodiment,
Since the basic structure is similar to that of the first embodiment, the same reference numerals are given and the description thereof is omitted.

FIG. 3 is a circuit block diagram of a BS broadcast video system showing a third embodiment of the present invention. In FIG. 3, this system has a first BS tuner built-in video device 20 and a second BS tuner built-in video device 21, both BS tuners 3 and 8 having a BS antenna 4
Received signals are respectively guided.

The output signals (FM detection signal, bit stream signal) of the BS tuners 3 and 8 are output terminals t ₁ and t _{2, respectively.}
JSB decoder 11 which is a descrambling device via
Are output respectively. Also, each BS tuner 3,8
Is configured to be supplied with power from the power supply circuits 7 and 10 of the respective devices, and the power supply circuits 7 and 10 supply power to the respective circuits when the power supply switches SW ₁ and SW ₃ are in the ON state. Each power supply circuit 7, 10 has a respective power supply switch SW ₁ , SW ₃
The control signals indicating the on / off state of are output to the JSB decoder 11, respectively.

This JSB decoder 11 has a changeover switch S
W ₂ is built-in, and the BS tuner 3 output of the first BS tuner built-in video device 20 is connected to the first device side terminal t ₁ of the changeover switch SW ₂ and the _second BS side is connected to the second device side terminal t _2. The BS tuner 8 outputs of the tuner-embedded video equipment 21 are guided respectively. The changeover switch SW ₂ is switch-controlled by the control signals of both power supply circuits 7 and 10, and selects the terminals t ₁ and t ₂ of the device in the power-on state. When both the devices 20 and 21 are both in the power-on state, the present selected position may be held, or priority may be provided.

The signal selected by the changeover switch SW ₂ is input to the decoding circuit 22 where it is descrambled. The descrambled video and audio signals are sent to the first BS tuner built-in video device 20 and the second BS.
It is output to the tuner built-in video equipment 21 or to other video equipment.

In the above configuration, when the power switches SW ₁ and SW _{2 of} both the BS tuner built-in video devices 20 and 21 are both turned on and driven, either one of the BS tuners 3 or 8 outputs the changeover switch SW. Selected in ₂ . The signal selected by the changeover switch SW ₂ (F
M detection signal, bit stream signal) is the decoding circuit 2
2 to obtain the descrambled signal.

When the power switch SW ₁ or SW _{2 of the first} or _second BS tuner built-in video equipment 20 or 21 is turned on and only one BS tuner built-in video equipment 20 or 21 is driven, the power is turned on. Device power supply circuit 7 or 10
Outputs a control signal, and the changeover switch SW ₂ selects the terminal t ₁ or t ₂ of the power-on device. Therefore, the output of the BS tuner 20 or 21 of the driven device is guided to the decoding circuit 22 via the changeover switch SW ₂ , and the descrambled signal is obtained.

J used in the system of the third embodiment
The SB decoder 11 has two input terminals so that it can be connected to the two BS tuner built-in video devices 20 and 21, respectively. Therefore, input terminal 3
If the system is more than one and the selection position of the changeover switch SW ₂ is three or more of the same number, it is possible to selectively connect to three or more BS tuner built-in video devices.

Further, according to the third embodiment, the changeover switch SW ₂ is configured to be changeover-controlled by the control signals from both power supply circuits 7 and 10. However, either one of the power supply circuits 7 or 10 is controlled. The switching may be controlled by a control signal from the device, or may be manually switched.

[0029]

As described above, according to the present invention, the changeover switch for selectively changing the BS tuner output and the built-in BS tuner output of the other connected video equipment of the BS tuner is provided. B selected by switch
Since the BS tuner built-in video equipment is configured so as to guide the S tuner output to the descrambler, the descrambler can be selectively connected to both BS tuner built-in video equipments, which is convenient in use.

According to another aspect of the present invention, there is provided a changeover switch for selectively changing between the BS tuner output of the first BS tuner built-in video equipment and the BS tuner output of the second BS tuner built-in video equipment. Since the video system is configured to guide the BS tuner output selected by the switch to the descrambling device, the descrambling device can be selectively connected to both BS tuner built-in video devices, which is convenient in use.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a video system for BS broadcasting (first embodiment).

FIG. 2 is a circuit block diagram of a video system for BS broadcasting (second embodiment).

FIG. 3 is a circuit block diagram of a video system for BS broadcasting (third embodiment).

[Explanation of symbols]

1 ... Television (BS tuner built-in video equipment), 2 ...
VTR (BS tuner built-in video device), 3, 8 ... BS tuner, 11 ... JSB decoder (descramble device), 20 ... First BS tuner built-in video device, 21 ...
Second BS tuner visceral video equipment, SW _1, SW ₃ ... power switch, SW ₂ ... changeover switch.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location H04L 9/34 H04N 5/44 A 7037-5C 7/16 A 8838-5C

Claims (5)

[Claims] 1. A BS tuner is provided, and a selector switch for selectively switching between an output signal of this BS tuner and an output signal of a BS tuner of another video device with a built-in BS tuner is provided, and the BS tuner selected by this selector switch. Video equipment with a built-in BS tuner characterized in that the output is led to a descrambler. 2. The changeover switch selects the output signal of the BS tuner of another video device with a built-in BS tuner when the power switch is off, and the output signal of the built-in BS tuner when the power switch is on. The BS tuner built-in video device according to claim 1. 3. A first BS tuner built-in video device and a second device.
A BS tuner built-in video device and a descrambling device, and provided with a changeover switch for selectively switching the outputs of the BS tuners of the both BS tuner built-in video devices.
A video system for BS broadcasting, wherein the BS tuner output selected by the changeover switch is led to the descrambler. 4. The video system for BS broadcasting according to claim 3, wherein the changeover switch is incorporated in the descrambling device. 5. The BS broadcasting video system according to claim 3, wherein the changeover switch is interlocked with a power switch of at least one of the video devices with a built-in BS tuner.