JPS61285837A - Connector for scrambler signal processing circuit - Google Patents

Abstract

PURPOSE:To simpify connection operation by inserting a scrambler signal processing circuit into a transmission line of a video signal. CONSTITUTION:The scramble signal processing circuit 21 is inserted into plugs 14, 15. The circuit 21 consists of an amplifier circuit 22, a descrambler circuit 23, a circuit 24 discriminating the presence of scramble signal, a short circuit 25 and a switch circuit 26. When a satellite broadcast television signal is inputted to an input terminal 1 while the circuit 21 is connected by a connector 11, a video signal existing after spread signal is eliminated is amplified by a video amplifier circuit 9 and the result is outputted from an output terminal 10. In taking out the plugs 14, 15 of the connector 11 from receptacles 12, 13, one switch spring 17 is connected to a brake spring 18 and the video signal is fed directly a spread signal elimination circuit 8, then the video signal including the scrambler signal is not reproduced. The video signal, however, not including the scrambler signal is reproduced.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a connection device for a scrambler signal processing circuit in a satellite television receiver that allows only the subscriber to reproduce the desired signal. .

``Prior art'' In general, satellite broadcast television uses a television signal that can be obtained with a satellite television receiver, and a scrambler that requires the subscriber to connect an adapter to obtain an image. There is a television signal that contains a signal. Of these, the television signal containing the scrambler signal lacks the horizontal synchronization signal or is superimposed with an interference wave signal, so it cannot be reproduced as is. Therefore, subscribers are provided with a scrambler signal processing circuit (adapter), which is connected to a television receiver and a horizontal synchronization signal is added to reproduce the desired television signal.

``Problems to be Solved by the Invention'' However, each time a TV signal containing a conventional scrambler signal is viewed, an adapter must be connected or a switch must be used to switch, which is cumbersome to operate.

"Means for Solving the Problems" The present invention has been made in order to solve the above-mentioned problems, and the present invention detects the signal of a predetermined channel from among the satellite broadcast television signals with a tuner circuit, In a receiver that obtains an image based on this video signal by demodulating, removing the spread signal, and amplifying the video signal, a connector is used to determine the presence or absence of a scrambler signal in the video signal transmission line. a descrambler circuit that demodulates the scrambler signal, a short circuit that shorts the transmission line, and a switch circuit that selectively combines the short circuit and the descrambler circuit using a signal from the discrimination circuit. It is characterized by the insertion of a processing circuit.

``Operation'' A satellite TV subscriber inserts a scrambler signal processing circuit into the conductive line of the receiver using a connector. When a television signal containing no scrambler signal is received, the discrimination circuit determines it and connects the short circuit by the switch circuit, so that a picture is obtained from the video signal. When the television signal includes a scrambler signal, the discrimination circuit detects it and connects it to the descrambler circuit using the switch circuit. Therefore, processing such as adding a horizontal synchronization signal and removing interfering signals is performed on the contract television signal to demodulate it into a normal video signal, and images can be obtained from this video signal.

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

In Figure 1, (1) is, for example, 43 in the case of the United States.
Input terminal for satellite broadcast television signals of 0 to 930 MHz, (
2) is a tuner circuit that selects the target channel and converts it to 70MHz (2) and (3) are IF (intermediate frequency)
amplifier circuit, (4) is a limiter, (5) is a demosimulator, (6) is a video amplifier circuit, (7) is a de-emphasis circuit, (8) is an energy spread signal (triangular wave) removal circuit, (9) ) is a video amplifier circuit, and (10) is a video output terminal.

The de-emphasis circuit (7) and the spread signal removal circuit (8)
) A connector (1 piece) is inserted between the two. This connector (11) has two receptacles (12)
(13) and two plugs (14) (15),
Among these, one receptacle (12) has a grounding fitting (16), a switch spring (17), and a break spring (1
8), the other receptacle (13) has a grounding fitting (19) and a switch spring (20), and the grounding fittings (16) and (19) are both grounded, and one switch spring (17) is coupled to the output side of the de-emphasis circuit (7), and the break spring (18) and the other switch spring (20) are connected together to form the spread signal removal circuit (8).
) is combined with Further, the plug (14) (1
5), a scrambler signal processing circuit (21) is inserted. This scrambler signal processing circuit (21) is
Amplifier circuit (22), descrambler circuit (23), scrambler signal presence/absence determination circuit (24), short circuit (2)
5) and a switch circuit (26).

In the above configuration, with the scrambler signal processing circuit (21) connected using the connector (11),
When a satellite TV signal is input to the input terminal (1), the tuner circuit (2) selects the signal of a predetermined channel,
Furthermore, it is converted into an intermediate frequency signal of 70 MHz and output. This signal is connected to the IF amplifier circuit (3) and the limiter circuit (4).
, demosimulator circuit (5), video amplifier circuit (6),
Via the de-emphasis circuit (7).

From the connector (11) to the scrambler signal processing circuit (21
) is sent to the discrimination circuit (24) via the amplifier circuit (22).

Here, it is determined whether the input TV signal includes a scrambler signal, and if the signal does not include a scrambler signal, there is no output from the discrimination circuit (24) and the switch circuit (26) is a normally closed contact. (27) side is connected. Therefore, the video signal is directly sent to the spread signal removal circuit (8) via the short circuit (25).

Further, when the input television signal includes a scrambler signal, an output is provided to the discrimination circuit (24) and the switch circuit (26) is switched to the normally open contact (28) side. Therefore, a horizontal synchronizing signal is added to the video signal by a descrambler circuit (23).

Demodulated to complete video signal and spread signal removal circuit (8)
sent to. The spread signal removal circuit (8) removes the superimposed spread signal of 15 or 30 Hz peculiar to the satellite broadcasting television signal, and the video signal after removing the spread signal is amplified by the video amplifier circuit (9) and sent to the output terminal ( 10).

When the plugs (14, 15) of the connector (11) are removed from the receptacles (12, 13), one switch spring (17) is connected to the break spring (18), and the video signal is directly transmitted to the spread signal removal circuit. (8), so the video signal including the scrambler signal is not reproduced. However, video signals that do not contain scrambler signals are played back.

``Effects of the Invention'' Since the present invention is configured as described above, it is possible to output both signals including scrambler signals and signals not including scrambler signals by simply inserting the connector plug and without performing any switching operations. will be played. Moreover, the circuit configuration is also simple.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the connecting device according to the present invention, and FIG. 2 is a concrete explanatory diagram of the same connector portion. (1)...Input terminal, (2)...Tuner circuit, (
3)...IF amplifier circuit, (4)...limiter, (5
)...Demosimulator, (6)...Video amplifier circuit, (7)...De-emphasis circuit.

Claims (2)

[Claims] (1) A tuner circuit detects the signal of a predetermined channel from among the satellite broadcast television signals and converts it into an intermediate frequency signal,
Furthermore, in a receiver that obtains an image based on the video signal by demodulating, removing the spread signal, and amplifying the video signal, a discrimination circuit for discriminating the presence or absence of a scrambler signal using a connector is provided in the transmission line of the video signal, and a scrambler signal is disposed in the transmission line of the video signal. Insert a scrambler signal processing circuit consisting of a descrambler circuit that demodulates the blur signal, a short circuit that shorts the transmission line, and a switch circuit that selectively combines the short circuit and the descrambler circuit using the signal from the discrimination circuit. A connection device for a scrambler signal processing circuit, characterized in that: (2) The scrambler signal processing circuit connection device according to claim 1, wherein the connector comprises two receptacles coupled to the transmission line and two plugs coupled to the scrambler signal processing circuit.