JPH06153194A - Reception control circuit - Google Patents

Abstract

PURPOSE:To prevent unpleasant scrambled video image from being displayed on a screen until such time as a scramble broadcast is started. CONSTITUTION:A scramble release detection circuit 17 at the time of the reception of a scramble broadcast detects whether or not a television signal with scramble release and decoding finished via a video and audio input terminal 14 from an external scramble decoder is inputted to a changeover circuit 6 selecting a signal through the decoder or a signal not there through to discriminate whether or not scrambling is released and control microcomputers 7, 8 do not start the display of scramble broadcast until such time as scramble release is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scrambled broadcast reception control circuit for video equipment such as a BS tuner, a television with a built-in CS tuner, and a VTR.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram of a reception control circuit of a conventional color television receiver with a built-in satellite broadcast tuner. In the figure, 1 is an FM by selecting a predetermined BS-IF signal from the BS-IF signals input from a BS converter (not shown).
It is a 2nd converter that demodulates. FM with 2nd converter 1
The demodulated BS-IF signal is extracted as a video signal and an audio PCM subcarrier signal, and is output from the detection output terminal 15 as a detection signal.

At the same time, the video signal is processed by the video signal processing circuit 5.
Then, the voice PCM subcarrier signal is input to the scramble signal / non-scramble signal switching circuit 6 through the QPSK demodulation circuit 2, the PCM demodulation circuit 3, and the DA converter 4. Also,
A video signal and an audio signal are input to the switching circuit 6 from a decoder having a scramble canceling function (hereinafter referred to as a scramble decoder) via a video / audio input terminal 14.

The E ² PROM 10 is preset by the operator for each channel as to whether to select a signal passed through the scramble decoder or a signal not passed through it.
The BS control microcomputer (hereinafter referred to as BS control microcomputer) 7 and the TV control microcomputer (hereinafter referred to as TV control microcomputer) 8 switch the switching circuit 6 based on the data stored in the E ² PROM 10.

The video / audio signal output from the switching circuit 6 is input to the switching circuit 11 for television, video and BS broadcasting,
The BS control microcomputer 7 and the TV control microcomputer 8 switch the television, video, and BS broadcast switching circuits 11 in accordance with the operator's selection with the operation / channel selection key 9.

The video / audio signals processed by the television signal processing circuit (hereinafter referred to as the television signal processing circuit) 12 are supplied to the television signal processing circuit 13 according to the switching of the switching circuit 11, and finally displayed on the screen. It Also voice
The PCM subcarrier signal is directly output as a bitstream signal from the bitstream signal output terminal 16 to an external device such as a facsimile.

[0007]

Since the conventional reception control circuit is constructed as described above, when the preset scrambled broadcast channel is selected, the scrambled broadcast is immediately switched to, so that the scramble is released. A scrambled image that disturbs the screen is displayed on the screen for a certain period of time until it is displayed. Furthermore, in the case of a scramble decoder that uses a charging system for each program, even if the channel is mistakenly selected, the charging will start immediately.

When the scramble decoder is not connected, an unpleasant scrambled image is displayed on the screen every time a scrambled broadcast channel is selected.

Further, in the case of a video equipment system having a smaller number of scramble decoders than a plurality of receivers, a scrambled broadcast can be viewed only by the receivers to which the scramble decoder is connected.

The present invention has been made in order to solve such a problem, and by not performing scramble broadcasting until the scramble is released, an unpleasant scrambled image at the time of channel selection of the scrambled broadcast is displayed. An object of the present invention is to provide a reception control circuit that avoids screen display and unnecessary charging, and a video equipment system that enables effective use of a small number of decoders by enabling input / output of television signals between receivers.

[0011]

A reception control circuit according to a first aspect of the present invention detects a scrambled broadcast channel based on a television signal of each channel and stores the detected scrambled broadcast channel. Characterize.

The reception control circuit according to the second aspect of the invention is characterized in that, based on the stored scrambled broadcast channel, when the scrambled broadcast channel is selected, this channel is not broadcast.

The reception control circuit according to the third aspect of the invention constantly detects whether or not switching to reception of scrambled broadcasting is performed during broadcasting when a channel in which scrambled broadcasting and other broadcasting are mixed is selected. It is characterized in that the channel is switched to an unscrambled broadcast channel at the time of switching to reception of scrambled broadcast.

The reception control circuit according to the fourth aspect of the present invention is provided with a detection circuit for detecting whether or not the scramble is released when the scrambled broadcast is received, and does not start displaying the scrambled broadcast until the scramble is released. And

In the video equipment system according to the fifth aspect of the present invention, even when the scrambled broadcast channel is selected by the receiver to which the scramble decoder is not connected, the scramble decoder is descrambled by another receiver connected to the scramble decoder. It is characterized in that the decoded television signal of the scrambled broadcast is inputted to the receiver.

[0016]

The reception control circuit according to the first aspect of the invention detects the channel of the scrambled broadcast based on the television signal of each channel and stores it.

The reception control circuit according to the second aspect of the invention, when the scrambled broadcast channel is selected based on the stored scrambled broadcast channel, disables the channel selection and does not broadcast the channel, Even if the scrambled broadcast channel is selected when the scramble decoder is not connected, the uncomfortable scrambled video is not displayed on the screen.

Further, the reception control circuit according to the present invention constantly detects whether or not the channel being broadcast is switched to the reception of the scramble broadcast, based on the received television signal, and is switched to the scramble broadcast. Switches to a non-scrambled broadcast channel,
Unnecessary billing is prevented when a program-based billing decoder is connected.

Further, the reception control circuit according to the present invention detects whether or not the scrambled broadcast is descrambled before displaying the scrambled broadcast, and prohibits the display of the scrambled broadcast until the scrambled broadcast is released. ,
After descrambling, start displaying scrambled broadcasts and avoid displaying unpleasant scrambled images until the start of scrambled broadcasts.

The video equipment system according to the present invention is
Even if a scrambled broadcast channel is selected by a receiver that is not connected to a scrambled decoder, other receivers connected to the decoder input and display the scrambled broadcast television signal that has been descrambled and decoded. However, the number of decoders with descrambling function that is smaller than the number of receivers is effectively used.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing its embodiments. 1 is a block diagram of a reception control circuit according to the present invention, which is the same as the conventional reception control circuit shown in FIG.
Alternatively, the corresponding parts will be denoted by the same reference numerals and the description thereof will be omitted. In the present embodiment, at the time of starting up the device or receiving a non-scrambled broadcast such as a terrestrial broadcast, the audio PCM subcarrier signal of each channel is fetched into the PCM demodulation circuit 3 via the 2nd converter 1 and the QPSK demodulation circuit 2. The BS control microcomputer 7 searches whether or not each channel is a scrambled broadcast channel based on these audio PCM subcarrier signals, and writes the scrambled broadcast channel to the E ² PROM 10 via the TV control microcomputer 8.

Next, the reception control operation of the scrambled broadcast by the reception control circuit having the above-mentioned configuration will be described with reference to the flow chart shown in FIG. When the main power switch of the equipment is turned on, the control microcomputers 7 and 8 search the BS channels of scrambled broadcasts in order (S1), in addition to the channel search by the receiver user's channel selection, and check for the presence or absence of scramble for each channel. Write to E ² PROM 10 (S2).

Further, considering that scrambled broadcasting starts or is interrupted on the same channel halfway, the BS channel is searched again after a lapse of a certain time.
(S3, S4), scramble presence / absence written in E ² PROM 10 is updated for each channel (S5). It is determined whether the BS channel is selected (S6), and steps S3 to S6 are repeated until the BS channel is selected.

When the BS channel is selected, the control microcomputers 7 and 8 read the scrambled data of the selected channel stored in the E ² PROM 10 and judge whether the scrambled channel is present or not ( S7). If there is scrambling, broadcasting of the current channel is continued without switching to the selected channel (S8). On the other hand, if the selected channel is not scrambled, the channel is switched to the selected channel (S9).

A reception control procedure when a channel of scrambled broadcasting in which scrambled broadcasting and non-scrambled broadcasting are mixed is selected will be described with reference to FIG. 1
While selecting one channel and receiving the broadcast (S11),
For example, if you select the next channel that switches between scramble and non-scramble depending on the reception time (S12),
If it is a scrambled broadcast, it is switched to the original channel or another non-scrambled channel, but if it is a non-scrambled broadcast, a non-scrambled screen is displayed.

After a certain time has passed in the non-scrambled state (S
13), the BS control microcomputer 8 is the audio P from the PCM demodulation circuit 3.
It is determined whether the scramble broadcasting is started by the CM subcarrier signal (S14). If the scramble broadcasting is not started, the process returns to step S13 and the non-scramble state is continued for a certain period of time. When detecting that the broadcast of the selected channel is scrambled, the TV control microcomputer 8
The broadcast is automatically switched to the next channel, for example, the non-scramble broadcast selected immediately before the broadcast currently being received (S12).

The next channel to be switched at the same time as scramble detection is not limited to the channel selected immediately before, and may be switched to any channel of non-scramble broadcasting.

FIG. 4 is a block diagram of another embodiment of the reception control circuit according to the present invention. The same or corresponding parts as those of the embodiment shown in FIG. In the present embodiment, the input of the descrambled video / audio signal from the scramble decoder via the video / audio input terminal 14 to the switching circuit 6 is detected to detect the descramble, and the TV control microcomputer 8 A descrambling detection circuit for supplying to the.

Next, the reception control operation of the scrambled broadcast by the reception control circuit having the above configuration will be described with reference to the flowchart of FIG. When the BS channel is selected (S21), the control microcomputer 7 or 8 judges whether or not the selected channel is scrambled based on the audio PCM subcarrier signal from the PCM demodulation circuit 3 (S22) and judges that there is no scramble. If you do that, the selected channel will be displayed immediately.

On the other hand, if it is judged that there is scramble, the TV
The control microcomputer 8 monitors the descrambling detection circuit 17 to check whether or not the descrambling is done (S2
3). It is judged by the monitor of the descramble detection circuit 17 whether or not the scramble is released (S24). If the scramble is not released, the screen is held on the screen of the channel before tuning (S25), and the process returns to step S23. Steps S23 to S25 are repeated until the scramble is released, and when the scramble is released, the screen display is switched to the selected channel.

In the present embodiment, the presence or absence of scramble is judged from the audio signal at the time of channel selection. However, the presence or absence of scramble of each channel is detected at the time of power-on, etc., and is preliminarily stored in the E ² PROM 10. The configuration may be such that it is stored and the determination is made based on this stored information.

FIG. 6 is a block diagram of still another embodiment of the reception control circuit according to the present invention. The same or corresponding parts as those of the embodiment of FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In the present embodiment, a decoder / scramble information exchange terminal 18 for inputting / outputting the presence / absence of scramble and setting information of the connected decoder to / from another receiver is provided.
The descrambled and decoded television signals from the decoder are input and output via the AV input / output terminal (video / audio input / output terminal).

Further, FIG. 7 is a block diagram of a video equipment system including two receivers having the reception control circuit shown in FIG. One receiver A19 has one BS channel
Decoder A21 for 1ch with descrambling function
Is connected, and the other receiver B20 has 2 channels of BS channel.
Dedicated 2ch decoder B22 with descrambling function
Are connected. The internal configuration of the two receivers A, B 19, 20 is the same.

The control microcomputer 23 (30), for example, receives a command for a reception tuning operation in the reception tuning circuit 25 (32), a signal from the connected decoder A21 (B22) and the other receiver B20.
A command for switching operation in the switching circuit 26 (33) of the television signal input from (A19) via the AV input terminal 28 (34), a decoder / receiver between the receiver A19 and the receiver B20.
The receivers A, B 19, 20 are comprehensively controlled such as the presence / absence of scramble via the scramble information exchange terminal 24 (31) and the exchange of setting information of the connected decoder.

Further, the AV output terminal 27 (35) is 1ch (2) from the receiver A 19 (B 20) and the decoder A 21 (B 22) on one side.
ch) is a terminal for outputting video / audio signals to the other receiver B20 (A19), and the AV input terminal 28 (34) is an input terminal for these signals. Further, the signal from the switching circuit 26 (33) is displayed on the screen via the signal processing / display circuit 29 (36).

Next, the operation will be described. For example, if 1 channel that requires the decoder A21 for reception is selected by the tuning operation in the receiver B20, the receiver B
20 control microcomputer 30 has decoder / scramble terminal 31
Via receivers 24 and 24, the receiver B20 selects 1ch to the control microcomputer 23 of the receiver A19, and transmits the 1ch television signal to the AV input terminal 34 of the receiver B20 via the AV output terminal 27. At the same time, the switching circuit 30 of the receiver B20 is switched from the decoder B22 side to the AV input terminal 34 side. The 1-channel television signal transmitted from the receiver A19 and the decoder A21 is displayed on the screen of the receiver B20 via the AV input terminal 34 of the receiver B20, the switching circuit 33, and the signal processing / display circuit 36.

On the other hand, when channel 2 is selected by the operation of selecting the receiver A19, the operation in the opposite direction to the above is performed. Also,
When channel 2 is selected by the operation of selecting the receiver B20, the switching circuit 33 is switched to the decoder B22 side and processing is performed with the decoder B22.

The information between the two decoder / scramble information exchange terminals 24, 31 is the same as that of the mutual control microcomputers 23, 30.
Any form such as binary data can be used as long as it can discriminate. Further, it may be divided into several types of information such as clock, data, and chip select.

Further, although the television with a built-in BS tuner has been described in the present embodiment, it can be applied to various video equipment such as a television with a built-in CS tuner, a VTR, a tuner and the like. Further, even in a video device in which a receiver and a scramble decoder are integrated, the same effect as that of this embodiment can be obtained.

[0040]

As described above, the reception control circuit of the present invention has an excellent effect of not displaying an unpleasant scrambled image even when a scrambled broadcast channel is selected by a receiver to which a scramble decoder is not connected. Play.

Further, since the reception control circuit of the present invention does not start the display of the scrambled broadcast until the scramble is released when the scrambled broadcast is received, it has an excellent effect of not displaying an unpleasant scrambled image.

Further, since the reception control circuit of the present invention switches to another channel that is not the scrambled broadcast channel when the broadcast is switched to the scrambled broadcast channel,
Even if the decoder is a billing system for each program, it is possible to avoid unnecessary billing.

Further, in the video equipment system of the present invention, even if the scrambled broadcast channel to be selected is not connected to the scramble decoder of the scrambled broadcast, the scrambled broadcast to be selected is selected. Since the descrambled scrambled broadcast and the decoded television signal are input from another receiver to which the scramble decoder is connected, the excellent effect that a small number of scramble decoders can be effectively utilized is exhibited.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a reception control circuit of the present invention.

FIG. 2 is a flowchart showing a reception control procedure of scrambled broadcasting by the reception control circuit shown in FIG.

3 is a flowchart showing a reception control procedure of scrambled broadcasting by the reception control circuit of the present invention shown in FIG.

FIG. 4 is a block diagram of another embodiment of the reception control circuit of the present invention.

5 is a flowchart showing a reception control procedure of scrambled broadcasting by the reception control circuit shown in FIG.

FIG. 6 is a block diagram of still another embodiment of the reception control circuit of the present invention.

7 is a block diagram of a reception system in which a plurality of receivers and decoders each including the reception control circuit shown in FIG. 6 are combined.

FIG. 8 is a block diagram of a conventional reception control circuit.

[Explanation of symbols]

3 PCM demodulation circuit 6 switching circuit 7 BS control microcomputer 8 TV control microcomputer 10 E ² PROM 14 Video / audio input terminal 17 Scramble release detection circuit

Claims (5)

[Claims] 1. A reception control circuit of a receiver capable of receiving a scrambled broadcast in which a television signal is scrambled and a scrambled broadcast which is not scrambled, and whether or not each receivable channel is a scrambled broadcast channel. A reception control circuit comprising: a means for detecting whether or not a channel is present based on a television signal of each channel; and a means for storing a channel of a scrambled broadcast. 2. The reception control circuit according to claim 1, further comprising means for invalidating the channel selection and not broadcasting the channel when the scrambled broadcast channel is selected. 3. A reception control circuit of a receiver capable of receiving a scrambled broadcast in which a television signal is scrambled and a scrambled broadcast which is not scrambled, and a channel being broadcast is switched to reception of a scrambled broadcast. Receiving means for detecting whether or not it is based on the received television signal, and means for switching to an unscrambled broadcast channel when switching to reception of scrambled broadcast Control circuit. 4. A reception control circuit of a receiver capable of receiving a scrambled broadcast in which a television signal is scrambled and a scrambled broadcast which is not scrambled, when a channel of the scrambled broadcast is selected. A circuit for detecting whether or not the scrambled broadcast is descrambled, and means for prohibiting the display of the scrambled broadcast until the scramble is released and for starting the display of the scrambled broadcast after the scramble is descrambled. Receiving control circuit. 5. A decoder having a descramble function for scrambled broadcasting, a means for outputting a television signal to another receiver and the decoder are not connected, and when a channel for scrambled broadcasting is selected, A plurality of receivers, each having means for inputting descrambled and decoded television signals of the scrambled broadcast from another receiver to which the decoder is connected. Video equipment system.