JPH08340524A - Scrambled signal receiver - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a scramble signal receiving apparatus capable of shortening the time during which an image cannot be seen on average. [Structure] The decoder 14 descrambles the scrambled signal selected by the tuner 5. The first selecting means 9 includes a scrambled signal from the tuner 5 and the decoder 1
The descrambled signal from 4 is selectively output. The input means 3 and 11 are supplied with an unscrambled video signal. The second selecting means 8 is the first selecting means 9
And the video signal from the input means 3 and 11 are selectively output. Designating means 12 and 13 designate a channel selected by the tuner 5. The storage means 7 stores the information on the selected channel. The control means 6 is the designating means 1
The tuners 5 are controlled so that the channels designated by 2 and 13 are selected, and the input means 3, 1 are controlled by the second selecting means 8.
When the video signal from No. 1 is selected, the tuner 5 controls the channel of the latest scramble signal stored in the storage unit 7 to be selected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scramble signal receiving apparatus for receiving a VHF / UHF broadcast or the like as well as a satellite broadcast to obtain a normal video signal, such as a television, a monitor, a projector, Also, the present invention relates to a scramble signal receiving device suitable for application to an image display device such as a liquid crystal display.

[0002]

2. Description of the Related Art For example, a receiving device for receiving only VHF / UHF broadcasts (hereinafter referred to as U / V) has been used in the past in home receiving systems, building receiving systems, and the like. In U.S.A., a receiving device for receiving U / V broadcasting, satellite communication and satellite broadcasting (hereinafter referred to as CS / BS) is standardized and used. In this CS / BS broadcasting, a pay broadcasting system has been introduced as one of the business forms.

The pay broadcasting system is a system in which "a viewer desires to watch a specific broadcast and receives a broadcasting service by concluding a consideration contract with a broadcasting company", and is called a conditional access system or the like. For example, in cable broadcasting, reception can be controlled by connecting the cable, but in wireless broadcasting, the same radio waves reach unsubscribed parties, so in pay broadcasting such as CS / BS broadcasting, The signal is scrambled and broadcast so that it cannot be viewed. Then, the contracted subscriber obtains a normal video signal by using the receiving device for receiving the CS / BS broadcast.

Therefore, the receiving device for receiving the CS / BS broadcast receives the received CS / BS signal in order to obtain a normal video signal.
It is provided with an input / output terminal for connecting a decoder which is an external device for performing descramble processing on the BS signal. Via this input / output terminal, the CS /
The BS signal is output to the decoder, and the signal descrambled by the decoder is input to the receiving device.

On the other hand, in the above-mentioned receiving apparatus, a scrambled CS / BS signal or a scrambled CS / BS signal is selected for each image output signal for each channel, and further, whether the selected CS / BS signal is selected or not. , A video signal obtained from a terrestrial wave or a video input is selectively output.

[0006]

Here, the above-mentioned signal selection from the decoder and the CS / BS selected immediately before are irrespective of the type of the video signal currently output. The broadcast channel signal is being output.

However, in order to detect the scrambled signal from the CS / BS signal received by the receiving device and perform the descrambling process, the decoder needs a processing time of several seconds to several tens of seconds (hereinafter, descrambler). It takes time.) Therefore, when the channel of the unscrambled signal is switched to the channel of the scrambled signal, the descrambled signal for outputting the image to the receiving device is not supplied during the descrambling time. Therefore, the user cannot see the image during the descrambling time.

Therefore, the present invention has been made in view of the conventional circumstances as described above, and has the following objects.

That is, an object of the present invention is to output a video signal which has already been descrambled when switching from a channel of an unscrambled signal to a channel of a scrambled signal, thereby averaging An object of the present invention is to provide a scramble signal receiving device that can reduce the time during which an image cannot be seen.

Another object of the present invention is to provide a scramble signal receiving apparatus which maintains compatibility with the functions of the conventional scramble signal receiving apparatus.

[0011]

In order to solve the above problems, a scrambled signal receiving apparatus according to the present invention includes a tuner for selecting a scrambled signal received by an antenna, and a channel selected by the tuner. Of the scrambled signal, a scrambled signal of the channel selected by the tuner, and a descrambled signal output from the tuner through the decoder. Selecting means, input means for receiving an unscrambled video signal, and second selecting means for selectively outputting the output signal of the first selecting means and the video signal input by the input means, The designation means for designating the channel selected by the tuner and the channel designated by the designation means are stored. Storage means and control means for controlling the tuner so that the channel designated by the designation means is selected. The control means is input by the input means by the second selection means. When the video signal is selected, the tuner is controlled so that the channel of the latest scramble signal stored in the storage means is selected.

The scrambled signal receiving apparatus according to the present invention further comprises external output means for externally outputting the output signal of the first selecting means, the designating means designating a fixed channel, and the control means. When the channel fixing is designated by the designating means, the tuner is controlled so that the channel of a signal externally output from the external output means is fixed.

[0013]

In the scramble signal receiving apparatus according to the present invention,
The tuner selects the scrambled signal received by the antenna. The decoder descrambles the scrambled signal of the channel selected by the tuner. The first selecting means selectively outputs the scrambled signal of the channel selected by the tuner and the descrambled signal output from the tuner through the decoder. The input means receives an unscrambled video signal. The second selection means selectively outputs the output signal of the first selection means and the video signal input by the input means. The designation means designates a channel selected by the tuner. The storage means
The channel designated by the designation means is stored.
The control means controls the tuner so that the channel designated by the designating means is selected. Further, the control means selects the channel of the latest scramble signal stored in the storage means when the video signal input by the input means is selected by the second selection means. To control the tuner.

In the scrambled signal receiving apparatus according to the present invention, the external output means externally outputs the output signal of the first selecting means. The designating means designates a fixed channel. The control means controls the tuner so that the channel of the signal externally output from the external output means is fixed when the fixing of the channel is designated by the designating means.

[0015]

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

The scrambled signal receiving apparatus according to the present invention is applied to, for example, a television receiving apparatus 100 as shown in FIG.

That is, the receiving apparatus 100 includes a U / V tuner 3 to which the U / V signal received by the U / V antenna 1 is supplied and a CS / B antenna received by the CS / BS antenna 2.
Via the CS / BS tuner 5 to which the S signal is supplied, the decoder output terminal 4 and the decoder input terminal 15 which are the input / output terminals of the decoder 14 which is an external device, the decoder switch 9 and the external video input terminal 11. An image output switch 8 to which an input signal, an output signal of the U / V tuner 3 and an output signal of the decoder switch 9 are respectively supplied,
A microcomputer that controls the operation of the entire device (hereinafter,
It is called a microcomputer. ) 6 and.

The output signal of the CS / BS tuner 5 is directly supplied to the decoder switch 9 and also to the decoder 14 via the decoder output terminal 4. The output signal of the decoder 14 is supplied to the decoder switch 9 via the decoder input terminal 15. Further, the output signal of the decoder switch 9 is supplied to the image output switch 8 as described above, and is externally output via the CS / BS output terminal 10. This CS / BS output terminal 1
A video recording device (not shown) is connected to 0, for example.

The microcomputer 6 controls the operation of the entire device based on instructions from the keys 12 and a remote control device (hereinafter referred to as a remote controller) 13. Further, the microcomputer 6 includes a key 12 and a remote controller 13.
The memory 7 stores the information of the instruction by.

Hereinafter, the receiving device 1 having the above-mentioned configuration
00 will be described.

The key 12 and the remote controller 13 are used by the user to instruct the operation of the apparatus. The key 12 and the remote controller 13 are used to instruct power ON / OFF and to specify a channel for the image output by the receiving apparatus 100. Setting the selection signal for each channel in the decoder switch 9, and C
Whether or not to fix the channel of S / BS broadcasting is designated.

The microcomputer 6 includes a key 12 or a remote controller 13
So that the operation instructed by
Operation control of the whole 0. Here, the microcomputer 6 uses the key 1
2 or the information of the channel designated by the remote controller 13 is stored in the memory 7. Details of the control in the microcomputer 6 based on the information stored in the memory 7 will be described later.

The U / V antenna 1 includes a UHF channel and a VHF channel (channel ch1 to channel ch).
62) A U / V shared antenna for receiving the U / V signal of 62), which has a bandwidth of 50 to 300 MHz.

Under the control of the microcomputer 6, the U / V tuner 3 selects a desired channel from the U / V signal received by the U / V antenna 1 and demodulates it, and from the demodulated baseband signal. The video signal V _UV and the audio signal LR _UV are generated. Then, the U / V tuner 3 generates the generated video signal V
_{The UV} and the audio signal LR _UV are supplied to the image output switch 8.

On the other hand, the CS / BS antenna 2 is, for example,
It consists of a parabolic antenna and is transmitted to the ground via a repeater of a broadcasting satellite placed in a geostationary orbit above the equator.
A CS / BS signal which is an FM television signal in the Hz band is received. CS received by this CS / BS antenna 2
The / BS signal is a signal scrambled using an arbitrary scramble sequence on the transmission side in order to prevent reception by a non-subscriber. Therefore, on the receiving device 100 side, the descramble process needs to be performed by the same signal sequence as on the transmitting side, and the descramble process needs to be performed in synchronization with the transmitting side. Information and timing signals for generating the same signal sequence as the side are transmitted in the control code of CS / BS broadcasting.

The CS / BS signal received by the CS / BS antenna 2 as described above is converted into a signal of an arbitrary frequency by converting it into a signal of an arbitrary frequency by a converter (not shown), for example.
It is supplied to the BS tuner 5.

Under the control of the microcomputer 6, the CS / BS tuner 5 selects a desired channel from the CS / BS signal received by the CS / BS antenna 2 via the converter, and selects the desired channel. The CS / BS signal is demodulated, and the video signal V _S and the audio signal LR _S are generated from the demodulated baseband signal. Then, the CS / BS tuner 5 supplies the generated video signal V _S and audio signal LR _S to the decoder switch 9.

The CS / BS tuner 5 also generates a bitstream signal serialized into a bitstream from the demodulated baseband signal, and the generated bitstream signal is decoder 14 via the decoder output terminal 4.
Supply to.

The decoder 14 detects the scrambled signal and the above-mentioned control code from the bit stream signal obtained by the CS / BS tuner 5. And the decoder 14
Performs a descrambling process on the bit stream signal from the CS / BS tuner 5 when a scramble signal is detected based on the detected control code. As a result, the descramble processing is performed with the same signal sequence as that on the transmitting side, and the descramble processing is performed in synchronization with the transmitting side. Therefore, the original signal that is descrambled and reproduced by the decoder 14 is
The video signal V _S ^d and the audio signal LR _S ^d are supplied to the decoder switch 9. On the other hand, when the scramble signal is not detected, the decoder 14 generates the video signal V _S ^d ′ and the audio signal LR _S ^d ′ from the signal after the detection by the CS / BS tuner 5 without performing the descrambling process. And supplies it to the decoder switch 9.

Therefore, the decoder switch 9 has a C
Video signal V _S and audio signal L from the S / BS tuner 5
R _S and the video signal V _S ^d and the audio signal LR _S ^d from the decoder 14 or the video signal V _S ^d ′ and the audio signal LR _S ^d ′ are supplied, respectively.

Therefore, the microcomputer 6 uses the key 12 described above.
Alternatively, when the input signal from the decoder 14 is not selected by the setting information of the selection signal in the decoder switch 9 set for each channel by the remote controller 13, the signal is directly supplied from the CS / BS tuner 5 to the decoder switch 9. The decoder switch 9 is controlled so that the video signal V _S and the audio signal LR _S are selected, and when the input signal from the decoder 14 is selected, the video signal V descrambled by the decoder 14 is selected. _The decoder switch 9 is controlled so that _S ^d and the audio signal LR _S ^d , or the video signal V _S ^d ′ and the audio signal LR _S ^d ′ obtained from the detection signal by the decoder 14 are selected.

Further, when the key 12 or the remote controller 13 specifies that the CS / BS broadcast channel is fixed, the microcomputer 6 prevents the CS / BS broadcast channel from switching. To control. That is, when the channel fixation is designated, the switching operation is controlled to be prohibited until the channel fixation is released.

As described above, the signal selectively output by the decoder switch 9 under the control of the microcomputer 6 is:
It is supplied to the image output switch 8 as a CS / BS broadcast video signal V _S and an audio signal LR _S , and is also supplied to a video recording device (not shown) via the CS / BS output terminal 10.

Therefore, the image output switch 8 has the video signal V _UV and the audio signal LR _UV from the U / V tuner 3 described above, the video signal V _S and the audio signal LR _S from the decoder switch 9, and the external signal described above. The signals input through the video input terminal 11 are supplied.

FIG. 2 is a flow chart showing the control of the image output switch 8 of the microcomputer 6.
Hereinafter, description will be made with reference to FIG.

First, as described above, the U / V broadcast channel or CS /
A BS broadcast channel or an input from the external video input terminal 11 (hereinafter referred to as a video input) is designated.
Further, the key 12 or the remote controller 13 specifies whether to use the input from the decoder 14 for each channel. At this time, the designation information is stored in the memory 7. When a U / V broadcast channel or a CS / BS broadcast channel is designated, the U / V tuner 3 or CS / BS is selected so that the designated channel is selected.
The tuner 5 is controlled (step S101).

Next, when the U / V broadcast channel is designated, the image output switch 8 controls so that the video signal V _UV and the audio signal LR _UV from the U / V tuner 3 are selected. When a CS / BS broadcasting channel is designated, the image output switch 8 selects the video signal V _S and the audio signal LR _S output from the decoder switch 9 via the CS / BS tuner 5. To control. When the video input is designated, the image output switch 8 controls to select the signal input through the external video input terminal 11 (step S102).

Next, the video signal V and the audio signal LR for image output are the video signal V _S and the audio signal L of the CS / BS broadcast.
It is determined whether it is R _S, that is, whether the channel of CS / BS broadcasting is designated (step S10).
3).

When the CS / BS broadcast channel is designated, this control process is terminated.

When the CS / BS broadcasting channel is not designated, the key 12 or the remote controller 13 is used to
It is determined whether or not the CS / BS broadcast channel is designated to be fixed (step S104).

If the CS / BS broadcast channel is designated to be fixed, as described above, the CS / BS tuner 5, the decoder switch 9, and the image output switch 8 are prevented so that the channel is not switched. Control to end the present control processing (step S105).
In this step S105, since the channel is fixed, nothing is actually done to control the switching operation of the channel, and this control process ends.

If it is not specified that the CS / BS broadcast channel is fixed, that is, if the U / V broadcast channel or video input is specified and the fixed channel is not specified, it is stored in the memory 7. Using the information of each channel, the most recently selected channel of the CS / BS broadcasting channels selected for input from the decoder 14 is searched, and the searched channel is the CS / BS tuner 5. The control is performed so that the channel is selected (step S106), and the control process ends.
Therefore, in this case, the decoder 14 starts the descrambling process for the CS / BS signal of the most recently selected channel.

As described above, in this embodiment, when the image output signals V and LR are not in the CS / BS broadcast channel, the input from the decoder 14 is selected using the key 12 or the remote controller 13. Among the CS / BS broadcasting channels, the most recently selected channel is CS.
/ Control so that the BS tuner 5 selects a channel, and
Since the decoder 14 is adapted to obtain the video signal and the audio signal which are descrambled, when the user designates the channel of CS / BS broadcasting, the video signal and the audio signal which are already descrambled. The signal is output as an image. Therefore, conventionally, the image can be viewed during the time when the image cannot be seen, and the time when the image cannot be seen can be shortened on average.

The CS / BS output terminal 10 is normally supplied with the signal of the most recently selected channel of CS / BS broadcasting, regardless of the type of the signals V and LR outputted as images. However, by designating the fixed channel with the key 12 or the remote controller 13, it is possible to prohibit the channel switching of CS / BS broadcasting. For this reason, the CS / BS broadcast channel is not accidentally switched.

For example, the signals V and LR for image output are U /
CS / BS output terminal 10
A video recording device (not shown) connected to the CS / BS
When recording a broadcast, by specifying a fixed channel, the above-described channel switching for performing the descramble process is not performed, and the specified CS / BS broadcast program is described above as in the conventional function. It can be recorded by a video recording device. That is, compatibility with conventional functions can be maintained.

[0046]

In the scramble signal receiving apparatus according to the present invention, the tuner selects the scramble signal received by the antenna. The decoder descrambles the scrambled signal of the channel selected by the tuner. The first selecting means selectively outputs the scrambled signal of the channel selected by the tuner and the descrambled signal output from the tuner through the decoder. The input means receives an unscrambled video signal. The second selection means selectively outputs the output signal of the first selection means and the video signal input by the input means. The designation means designates a channel selected by the tuner. The storage means stores the channel designated by the designation means. The control means controls the tuner so that the channel designated by the designating means is selected. Further, the control means selects the channel of the latest scramble signal stored in the storage means when the video signal input by the input means is selected by the second selection means. To control the tuner. As a result, when the video signal input by the input means is switched to the scramble signal received by the antenna, the video signal that has already been descrambled is output. You can watch the video of the channel that was selected recently. Therefore, it is possible to reduce the time during which an image cannot be seen on average.

Further, in the scramble signal receiving apparatus according to the present invention, the external output means externally outputs the output signal of the first selecting means. The designating means designates a fixed channel. The control means controls the tuner so that the channel of the signal externally output from the external output means is fixed when the fixing of the channel is designated by the designating means. This makes it possible to prohibit channel switching when channel fixing is designated. Therefore, it is possible to maintain compatibility with the function of the conventional scramble signal receiving device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a television receiver to which a scrambled signal receiver according to the present invention is applied.

FIG. 2 is a flowchart showing a control process of a microcomputer of the receiving device.

[Explanation of symbols]

 1 U / V antenna 2 CS / BS antenna 3 U / V tuner 5 CS / BS tuner 6 Microcomputer 7 Memory 8 Image output switch 9 Decoder switch 10 CS / BS output terminal 11 External video input terminal 12 Key 13 Remote control 14 Decoder 100 Receiver

Claims (2)

[Claims] 1. A tuner for selecting a scrambled signal received by an antenna, a decoder for performing a descrambling process on a scrambled signal for a channel selected by the tuner, and a tuner for selecting a channel selected by the tuner. First selection means for selectively outputting a scrambled signal and a descrambled signal output from the tuner through the decoder; input means for inputting an unscrambled video signal; and the first selection Second selection means for selectively outputting the output signal of the means and the video signal input by the input means, designating means for designating a channel selected by the tuner, and storing the channel designated by the designating means. Storage means and the channel so that the channel designated by the designating means is selected. And a control means for controlling the video signal, wherein the control means controls the latest scramble stored in the storage means when the video signal input by the input means is selected by the second selection means. A scrambled signal receiving device, characterized in that the tuner is controlled so that a channel of a signal is selected. 2. An external output means for externally outputting the output signal of the first selecting means, wherein the designating means designates fixing of a channel, and the control means designates fixing of the channel by the designating means. The scrambled signal receiving apparatus according to claim 1, wherein the tuner is controlled so that the channel of the signal externally output from the external output means is fixed when the signal is output.