JPH0294983A - Catv system - Google Patents

Abstract

PURPOSE:To execute the setting change of a scramble channel for every sendings-out of channel data by adding one bit of a signal to channel attribute data to be sent from a center and executing audio-visual control in accordance with the level value of the added signal. CONSTITUTION:When the channel attribute data are sent out from a center 1, they are sent by adding one bit of an audio-visual control signal to each channel attribute data. When CATV terminals 2a-2n receive the channel attribute data, they also receive the audio visual control data and the audio-visual control of the channel is executed in accordance with the on-state or the off- state of the audio-visual control signal by an audio-visual control means 22. Thus, the audio-visual control can be executed with one bit of increase of data quantity, more data can be sent out, and the setting of the scramble channel can be changed for every sendings-out of the channel data.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is applied to a CATV system in which communication is performed by data transmission between a center and a CATV terminal. In particular, it relates to viewing control means for CATV terminals.

〔overview〕

In the viewing control system of CATV terminals, the present invention adds a 1-bit signal to the channel attribute data sent from the center, and performs viewing control according to the level value of this added signal, thereby changing the scramble channel settings. can be performed every time channel data is transmitted.

[Conventional technology]

Conventionally, as a viewing control method for this type of CATV terminal, viewing control data is stored in a ROM for each terminal in advance, and viewing control is performed using the fixed data in the ROM fixing method, or viewing control data is stored in a dedicated There is a way to send it as channel data.

[Problem that the invention seeks to solve]

In this conventional ROM fixing method, each terminal has fixed data, so the channel data cannot be changed from the center, and in the method of sending channel data exclusively for viewing control, it is not possible to change the channel data separately from the channel attributes. There is a drawback that channel data for viewing control needs to be sent, which increases the amount of data.Furthermore, in these methods, the channel to be scrambled is fixed and cannot be changed.

The present invention aims to eliminate these drawbacks and provides a CATV system that can transmit a large amount of data and can also set scramble channels.

[Means for solving problems]

The present invention includes a CATV terminal and a center connected to the CATV terminal, and the center includes data generation means for generating channel attribute data and a transmitter for transmitting a frame signal including the channel attribute data to the CATV terminal. In the CATV system, the center has a frame generating means for generating a frame signal by adding a 1-bit signal to the channel attribute data and supplying this frame signal to the transmitting means,
The V terminal is characterized in that it has viewing control means for controlling viewing of channels according to the level value of an added 1-bit signal included in the frame signal transmitted from the transmission means.

[Effect]

A frame with a 1-bit signal added to channel attribute data is sent from the center to the terminal. The terminal controls channel viewing according to the on/off status of this 1-bit signal. For control requiring a plurality of bits, the additional bits of the repeated transmission frames are accumulated and used as "viewing control information."

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. 1st
The figure is a block configuration diagram showing the configuration of this embodiment.

FIG. 2 is a format diagram showing the structure of a frame signal used in this embodiment.

In this embodiment, as shown in FIG.
to 2n, and a center 1 connected to the CATV terminals 2a to 2n.
CATV terminals 2a to 2n, and frame generation means 12 for generating a frame signal in which a 1-bit signal is added to the channel attribute data and giving this frame signal to the transmission means 13. 2n
has viewing control means 22 for controlling viewing of channels in accordance with the level value of the added 1-bit signal included in the frame signal transmitted from transmitting means 13.

Next, the operation of this embodiment will be explained.

When transmitting the channel attribute data a from the center 1, a 1-bit viewing control signal S is added to each channel attribute data a and then transmitted. When the CATV terminals 2a to 2n receive the channel attribute data a, they also receive the viewing control data b, and perform viewing control of the channel depending on whether the viewing control signal is on or off.

〔Effect of the invention〕

As explained above, the present invention uses one bit in the channel attribute data from the center as a viewing control signal, thereby transmitting the channel attribute data.
Viewing control can be performed by increasing the amount of bit data, so more data can be transmitted, and the scramble channel setting can also be changed each time channel data is transmitted.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a data state diagram showing data contents from the center applied in the embodiment of the present invention. FIG. 3 is a data state diagram showing data contents from a center applied in a conventional example. 1...Center, 2a, 2n...Terminal, 11
...Data generation means, 12...Frame generation means,
13... Transmitting means, 21... Receiving means, 22...
Viewing control means, 23... television receiver.

Claims (1)

[Claims] 1. Comprising a CATV terminal and a center connected to the CATV terminal, the center has data generation means for generating channel attribute data and a frame signal containing the channel attribute data to the CATV terminal. In the CATV system, the center has a frame generating means that generates a frame signal by adding a 1-bit signal to the channel attribute data and supplies this frame signal to the transmitting means, A CATV system characterized in that the CATV terminal has viewing control means for controlling viewing of a channel according to the level value of an added 1-bit signal included in the frame signal transmitted from the transmission means.