JP2562782Y2 - BS decoder connection device - Google Patents

Description

[Purpose of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a BS decoder connection device for connecting a BS decoder for descrambling a scrambled satellite broadcast to a television receiver or the like.

[0002]

2. Description of the Related Art In recent years, satellite broadcasting (BS) has been put to practical use. However, broadcast signals of private satellite broadcasting are scrambled, and unless the scramble is canceled by using a BS decoder, the commercial satellite broadcasting is not used. The broadcast cannot be received. Therefore, unless a BS decoder is connected to a television receiver having a built-in BS tuner, the private satellite broadcast cannot be received.

FIG. 4 is a block diagram showing a conventional example of a BS decoder connection device for combining a BS decoder with a conventional television receiver with a built-in BS tuner. BS output from BS tuner 1 in television receiver 50
The detection output signal and the bit stream signal are converted into BS decoder 7
, The BS decoder 7 is connected to the television receiver 5.
0 terminals 4 and 5. The BS decoder 7 has a terminal 4,
5. Input BS detection signal and bit stream signal from 5
The scrambled signal is descrambled to obtain a normal received signal, which is output to the video input terminal 6 of the television receiver 50. On the other hand, the output signal of the BS tuner 1 is simultaneously input to the terminal b of the AV switching unit 3. or,
U / V tuner 2 for ground station in television receiver 50
Is input to the terminal a of the AV switching unit 3.
Therefore, when the scramble signal is selected by the BS tuner 1, if the switch SW1 of the AV switching unit 3 is set to the terminal c and the video input terminal 6 is not selected, the broadcast outputting the scramble signal is received. I can't see it.

FIG. 5 is a block diagram showing another example of a conventional BS decoder connection device. In this example, the non-scrambled signal output from the BS decoder 7 is input to a BS input terminal 8 provided in the television receiver 50. In this example, a switch SW2 is provided inside the television receiver 50. The switch SW2 switches the output side of the BS tuner 1 and the BS input terminal 8 side, and connects the BS tuner to the terminal a of the AV switching unit 3. 1 or a signal input from the BS input terminal 8. When the output jack of the BS decoder 7 is connected to the BS input terminal 8 of the switch SW2, the terminal SW is mechanically switched to the terminal b. For this reason, in this example, the user does not need to switch with a switch or the like as in the example shown in FIG. 4 depending on the reception of the non-scrambled signal and the reception of the scrambled signal. In addition to receiving signals, non-scrambled signals cannot be received, and satellite broadcasting cannot be received at all.

[0005]

[Problems to be Solved by the Invention] As described above, the conventional BS
When a satellite broadcasting channel is selected and the received signal changes from a non-scrambled signal to a scrambled signal, or vice versa when the decoder connection device is used, the switch SW1 of the AV switching unit 3 is set to B each time.
Since the user has to manually switch from the S tuner to the video input side or vice versa, there is a drawback that a burden is imposed on the user and comfortable viewing of satellite broadcasts is alienated. Therefore, there is a BS decoder connection device that avoids such a drawback, but this device has a drawback that if the power is not supplied to the BS decoder, satellite broadcast of any channel cannot be received. .

Accordingly, the present invention eliminates the above-mentioned drawbacks. In this invention, it is possible to receive satellite broadcasting without discrimination between a non-scrambled signal and a scrambled signal only by selecting a satellite broadcasting channel, and to turn off the power of a BS decoder. It is an object of the present invention to provide a BS decoder connection device that can receive only the non-scrambled signal at times. [Structure of device]

[0007]

A BS coder connection device according to the present invention has a BS tuner provided in a device main body for receiving satellite broadcasting, and an output signal from the BS tuner, and a scrambled signal. A BS decoder for descrambling and outputting the signal, an input terminal for introducing an output signal from the BS decoder into the apparatus main body, and a detecting means for detecting a signal input to the input terminal. Means for selectively extracting either a signal input to the input terminal or a signal output from the BS tuner, wherein the signal is input to the input terminal when a signal is detected by the detection means. And a signal processing means for processing a signal selectively extracted by the switching means. .

[0008]

In the BS decoder connection device of the present invention, the BS decoder
The decoder receives an output signal from a BS tuner provided in the apparatus main body to receive the satellite broadcast, descrambles the scrambled signal, and outputs the descrambled signal. The input terminal introduces an output signal from the BS decoder into the device main body. The detecting means detects a signal input to the input terminal. The switch means selectively takes out one of a signal input to the input terminal and an output signal of the BS tuner, and a signal input to the input terminal when a signal is detected by the detection means. Is selected and output. The signal processing means processes a signal selectively extracted by the switch means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a BS decoder connection device according to the present invention. Reference numeral 1 denotes a BS tuner provided in a television receiver with a built-in BS tuner to select satellite broadcasting, 2 to a U / V tuner to select broadcasting from a ground station, 3 to satellite broadcasting and terrestrial broadcasting. AV switching unit for switching between station broadcasting and video input, 4 is a detection signal output terminal, 5 is a bit stream output terminal, 6 is a video signal input terminal, 7 is a signal connected to a television receiver 50 and scrambled. BS decoder for descrambling, 8 is B
A BS input terminal for inputting a non-scramble signal output from the S decoder, 9 is a signal detection circuit for detecting whether or not a signal is input from the BS input terminal 8, and SW1 is AV.
A signal switching switch in the switching unit 3, and SW3 is BS
A switch for switching between the output signal of the tuner 1 and the input signal from the BS input terminal 8 and introducing the signal to the AV switching unit 3.

FIG. 2 is a circuit diagram showing a specific configuration example of the signal detection circuit 9 shown in FIG. Capacitor C1, C
2, C3, resistors R1, R2, R7 and transistor Q1
Constitutes a sync separation circuit 21 for separating a sync signal from a signal input from the BS input terminal 8. Capacitor C
4, resistor R3, resistor R4, resistor R5, transistor Q
2, Q3 is a signal conversion circuit that sets the collector of the transistor Q3 to high level while the synchronization signal is being input from the input circuit, and sets the collector to low level when no synchronization signal is input.
2 and the output signal of the signal conversion circuit 22 is a resistor R6
Is input to the switching control terminal A of the switch SW3 through the switch SW3.

Next, the operation of this embodiment will be described. B
A satellite broadcast is selected by the S tuner 1 and the obtained detection output is output from the detection output terminal 4 to the BS decoder 7 and a bit stream is output from the output terminal 5 to the BS decoder 7.
Output to The BS decoder 7 descrambles the scrambled input signal scrambled from the input detection output and bit stream and inputs the descrambled signal to the BS input terminal 8. Also, this BS deco-
When a non-scramble signal is input from the BS tuner 1, the der 7 outputs it to the BS input terminal 8 as it is.
At the same time, the reception signal selected by the BS tuner 1 is input to the terminal a of the changeover switch SW3.

A signal detection circuit 9 detects whether or not a signal is input from the BS input terminal 8. If no signal is input, the changeover switch SW 3 is set to the terminal “a”. Perform switching control. Therefore, BS
When the power is supplied to the decoder 7, the output signal of the BS decoder 7 is input from the BS input terminal 8, so that the changeover switch SW3 is switched to the terminal b. Therefore, in this case, the received signal selected by the BS tuner 1 is input to the input terminal b of the AV switching unit 3 via the BS decoder 7.
Will be entered. Therefore, if the changeover switch SW1 of the AV switching unit 3 is set to the input terminal b side, the broadcast of all the satellite broadcast stations is received only by selecting the non-scramble station / scramble station by the BS tuner 1. be able to.

On the other hand, when the power of the BS decoder 7 is turned off, no signal is input to the BS input terminal 8, so that
Since the signal detection circuit 9 does not detect the input signal, the switch SW3 is switched to the terminal a. Thereby, when the switch SW1 of the AV switching unit 3 is switched to the terminal b side, the reception signal selected by the BS tuner 1 is directly input to the input terminal b of the AV switching unit 3 via the switching switch SW3. Therefore, even if the power of the BS decoder 7 is turned off, it is possible to receive a station broadcasting a non-scramble signal among satellite broadcasting stations.

Here, the detailed operation of the signal detection circuit 9 shown in FIG. 2 will be described. A synchronization signal is separated from a signal input from the BS input terminal 8 by a synchronization separation circuit 21 centered on the transistor Q4.
2, Q3 and the like are input to the signal conversion circuit 22. The signal conversion circuit 22 changes its output to a high level when a synchronization signal is input, and changes its output to a low level when no synchronization signal is input. The change-over switch SW3 is switched to the terminal b while a high-level signal is being input from the signal detection circuit 9 to its control terminal A, and conversely to the terminal a while a low-level signal is being input. Switch.

According to the present embodiment, while the BS decoder 7 is powered on, all satellite broadcasts are broadcasted by simply selecting a satellite broadcast station by the BS tuner 1 of the television receiver. Can be received. If the BS decoder 7 is not powered on, it can receive a scrambled satellite broadcast station.

FIG. 3 is a block diagram showing another specific example of the signal detection circuit shown in FIG. In this example, the synchronization signal is separated from the signal input from the BS input terminal 8 by the synchronization separation circuit 31, and the separated synchronization signal is input to the microcomputer 32. During the period when the synchronizing signal is being input, the microcomputer 32 operates the changeover switch S.
When W3 is switched to the terminal b side and the input is stopped, the switch SW3 is switched to the terminal a side. Even when the signal detection circuit 9 of this example is used, the same effect as when the above-described signal detection circuit 9 is used is obtained.

[0017]

As described above, according to the BS decoder connection apparatus of the present invention, it is possible to receive satellite broadcasts without discriminating non-scrambled signals / scrambled signals only by selecting a satellite broadcast channel, and to provide a BS decoder. When the power is off, only the non-scramble signal can be received.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a BS decoder connection device of the present invention.

FIG. 2 is a circuit diagram showing a specific example of the signal detection circuit shown in FIG.

FIG. 3 is a block diagram showing another specific example of the signal detection circuit shown in FIG. 1;

FIG. 4 is a block diagram showing an example of a conventional BS decoder connection device.

FIG. 5 is a block diagram showing another example of a conventional BS decoder connection device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... BS tuner 2 ... U / V tuner 3 ... AV switch part 7 ... BS decoder 8 ... BS input terminal 9 ... Signal detection circuit SW1, SW3 ... Switch

Claims (1)

(57) [Scope of request for utility model registration] 1. A BS tuner provided in an apparatus main body for receiving satellite broadcasting, a BS decoder for receiving an output signal from the BS tuner, descrambled scrambled signal, and outputting the descrambled signal. An input terminal for introducing an output signal from the BS decoder into the apparatus main body, a detecting means for detecting a signal input to the input terminal, and a signal input to the input terminal or the BS. Switch means for selectively taking out one of the output signals of the tuner, and a switch means for selectively outputting a signal inputted to the input terminal when a signal is detected by the detection means; And a signal processing means for processing a signal selectively extracted by the means.