JPH04286481A - Scramble signal processor - Google Patents

Abstract

PURPOSE:To prevent a scramble signal from being recorded in the case of e.g. timer reservation recording. CONSTITUTION:A scrambled video signal from a tuner 2 is fed to a descrambler 3 and a video signal whose scrambling is released from the descrambler 3 is fed to a VTR 4. A controller 5 controls the operation of the tuner 2, the descrambler 3 and the VTR 4. In the case of the timer reservation video recording, when a reserved time reaches, the power supply for the tuner 2 and the descrambler 3 is applied to start the operation and the power supply of the VTR 4 is set to set the recording state after lapse of a time Td. The time Td is at least a time till descrambling is normally implemented after the power supply of the descrambler 3 is applied. Since the VTR 4 is brought into the recording state after the video signal whose scrambling is released to the VTR 4, the recording of the scrambled video signal is prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scrambled signal processing apparatus for descrambling scrambled signals from, for example, a CS (communication satellite) or a BS (broadcasting satellite) and performing recording processing or the like.

0002

[Prior Art] For example, a scrambled video signal from a CS or BS is descrambled by a descrambler and then supplied to a VTR for recording or supplied to a monitor receiver. The image is played back.

[0003] After decoding the scramble, the descrambler starts descrambling. In this case, since it takes time to decipher the scramble, the descrambled video signal is output with a delay of a predetermined time, for example, about 10 seconds, after the start of the operation.

0004

[Problem to be solved by the invention] Therefore, for example, VT
When timer reservation recording is performed on R, if the operation of the descrambler is started at the reservation time and recording is started with the VTR in the recording state, there is an inconvenience that a scrambled video signal is recorded for the first predetermined time.

[0005] Also, when reproducing images by supplying the output signal of a descrambler to a monitor receiver, for example, when the descrambler starts operating and the monitor receiver is turned on, the distorted image is displayed for an initial predetermined period of time. There is a problem with the display.

[0006] Such inconveniences also occur when a scrambled audio signal is descrambled using a descrambler and then recorded on a tape recorder with a timer reservation, or when outputting audio by supplying it to a speaker. arise.

Accordingly, the present invention prevents scrambled signals from being recorded, for example, during timer reservation recording, and also prevents, for example, a distorted image from being displayed or distorted audio from being output.

[0008]

[Means for Solving the Problems] The present invention provides a descrambler to which a scramble signal is supplied, a signal processing section to which an output signal of the descrambler is supplied, and a controller for controlling the operations of the descrambler and the signal processing section. It is equipped with the following. After the descrambler starts operating and the descrambling operation is performed normally, the signal processing section starts operating.

[0009]

[Operation] For example, in the case of timer scheduled recording, the VTR (signal processing unit) starts recording after the descrambler performs the descrambling operation normally and the descrambler outputs a descrambled video signal. starts. Therefore, scrambled video signals are not recorded on the VTR.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In this example, a CS tuner and a descrambler are not built into the VTR.

[0011] In the figure, a CS broadcast signal from an antenna 1 is supplied to a tuner 2 . The scrambled video signal obtained at the output terminal of tuner 2 is supplied to the input terminal of descrambler 3. The descrambled video signal obtained at the output terminal of the descrambler 3 is supplied to the input terminal of the VTR 4.

Tuner 2, descrambler 3 and VT
The operation of R4 is controlled by controller 5. This controller 5 is equipped with a timer (not shown), and is capable of so-called timer scheduled recording.

In the case of timer recording, the controller 5 controls the operations of the tuner 2, descrambler 3, and VTR 4 as follows. That is, when the reserved time comes, the tuner 2 and descrambler 3 are powered on and start operating. Then, after the time Td has elapsed, the VTR 4 is turned on to enter the recording state.

[0014] In this case, the time Td is set at least to the time from when the descrambler 3 is powered on and starts operating until it decodes the scramble and normally performs the descrambling operation.

The present example is constructed as described above, and when timer recording is to be performed, the VTR 4 enters the recording state after the time Td has elapsed after the descrambler 3 starts operating. In other words, after the descrambler 3 has successfully performed the descrambling operation and a descrambled video signal is supplied to the input terminal of the VTR 4,
R4 enters the recording state and starts recording. Therefore, according to this example, when timer recording is performed, it is possible to effectively prevent a scrambled video signal from being recorded for the first predetermined period of time.

[0016] In the above embodiment, the tuner 2 and descrambler 3 are separate from the VTR 4, but
As shown in FIG. 2, the tuner 2 and descrambler 3 are
It can be similarly applied to what is built into TR4. In this case, the output signal of the descrambler 3 will be supplied to the recording section 6. In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals.

Further, in the above embodiment, the operation of the tuner 2 and descrambler 3 is started after the reserved time, but by starting the operation Td before the reserved time, the operation of the tuner 2 and descrambler 3 is started. Recording can be started from the reserved time. This prevents the beginning of the reserved program from being recorded and spoiling the story.

Furthermore, in the above embodiment, the output signal of the descrambler 3 is supplied to the VTR 4 and recorded, but the present invention supplies the output signal of the descrambler 3 to a monitor receiver to record the image. It can also be applied to playback. In this case, the controller 5 turns on the power to the descrabler 3 to start its operation, and turns on the power to the monitor receiver after the elapse of time Td.

According to this, after the descrambling operation is normally performed in the descrambler 3 and a descrambled video signal is supplied to the monitor receiver, the monitor receiver is turned on. Therefore, it is possible to effectively prevent a distorted image from being displayed for the first predetermined period of time.

Although the above embodiments have been described with reference to video signals, the present invention descrambles scrambled audio signals using a descrambler and then records the scrambled audio signals with a timer on a tape recorder or supplies them to a speaker. The present invention can be similarly applied to a processing device that outputs audio.

Furthermore, it goes without saying that the present invention can also be applied to devices that record scrambled signals transmitted via cables such as CATV.

[0022]

According to the present invention, after the descrambler starts operating and the descrambling operation is performed normally, the signal processing section starts operating. Therefore, for example, when performing timer scheduled recording, the recording operation of the VTR (signal processing section) starts after the descrambler outputs the descrambled video signal, so the first predetermined time period is scrambled. It is possible to effectively prevent the recorded video signal from being recorded.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment.

FIG. 2 is a block diagram showing another embodiment.

[Explanation of symbols]

2 Tuner 3 Descrambler 4 VTR 5 Controller 6 Recording Department

Claims (1)

[Claims] 1. The descrambler, comprising: a descrambler to which a scramble signal is supplied; a signal processing section to which an output signal of the descrambler is supplied; and a controller for controlling operations of the descrambler and the signal processing section. 1. A scrambled signal processing device characterized in that the operation of the signal processing section is started after the operation of the signal processing section is started and the descrambling operation is normally performed.