JPS59149441A - Satellite broadcast receiver - Google Patents

Abstract

PURPOSE:To remove the disadvantage of a subscriber by allowing the subscriber to set a program of correct data on the basis of an error detection output. CONSTITUTION:Reference data for deciding on an error is added to pulse type data on a subscriber address, use-permissible channel number, time, etc., which are sent from a broadcasting station 1 to every subscriber 3, and they are transmitted as one piece of data. Each subscriber side 3 is equipped additionally with an error detecting circuit 34 which reads and detects whether input data is correct or not once the subscriber address is inputted and then the reference data is inputted, a display device which turns on when the error detection output of the circuit 34 is inputted, and data input device. If an error occurs in the data, it is detected by the circuit 34 and the display device of the circuit 35 is turned on. The subscriber operates the data input device in the circuit 35 on the basis of the display data to input correct data to an FM demodulating and descrambling device 32. Consequently, even if there is disadvantage on the side of the broadcasting station 1, the acceptance of such a complaint that a subscriber can not watch a desired program is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a satellite broadcast receiving apparatus that receives television broadcasts and the like transmitted using a broadcasting satellite.

Conventional configuration and its problems Currently, in satellite broadcasting systems, video signals transmitted from broadcasting stations are sent after being scrambled, and only subscribers to this satellite broadcasting receiving system can obtain regular video signals through a descrambling device. That's what I do.

A conventional example of such a transmitting/receiving device is shown in FIG.

In the figure, reference numeral 1 denotes a broadcasting station, which transmits a scrambled video signal to the satellite 2 as an SHF signal 4. Then, the video signal is transmitted from the satellite 2 again as an SHF signal 6 to each subscriber 3.
(3A, 3B, 3Z) [I'm trying to send it. The subscriber 3 installs a down converter 31 that converts the 12 GHz SHF signal into an intermediate frequency signal of about 1 GH2, and demodulates the signal from this down converter 31 to a regular video signal through the FM demodulation/descrambling device 32 to receive television. Added to machine 33.

Here, broadcasting station 1 sends the subscriber address, authorized channel number, and
Data such as the permitted town time are sent separately as pulse-like signals, and the charges paid by subscribers are determined separately based on this data, and the billing amount is also notified to each subscriber 3 through SHF signals 4 and 5. It becomes possible. In this way, important data is transmitted as a pulse signal, but S H
F (No. 7 4 and 5 pass through the outside world, so the external slope of the pulse 1, which is unique to FM satellite signals, is caused by weak electric fields or the effects of rain, snow, etc.
Sound may occur and important data may be transmitted to the subscriber as a false signal.

Conventionally, as a 71 measure, the same data such as subscriber address and usage permission channel number, as shown as A, B, and Ci in Fig. 2, is transmitted and received three times at a predetermined time interval, and the same data is sent and received twice at a predetermined time interval. A method has been proposed to determine whether data is normal when it is obtained, or if there are a large number of subscribers, it takes several hours to repeatedly send and receive the same data multiple times, which is inefficient and has not been put to practical use. It has the disadvantage of being difficult. For size ζ and pulse, if an incorrect size is expected in the number, there is a technical process for detecting the incorrect size and correcting 8g1 size WJ. For example, if incorrect size detection is performed, data at a certain time and data before and after the music or human voice do not change much, so these data can be stored and used to replace a single incorrect word. However, the problem with the present invention is the data unique to each subscriber, and since each subscriber's data is all very different, the data of other subscribers It is against the purpose of memorizing and substituting it.

Purpose of the Invention In view of the conventional problems as described in section 2, the present invention detects when erroneous satellite broadcasting data is received and immediately transmits the required data to an FM demodulation/descrambling device. It is an object of the present invention to provide a satellite broadcast receiving device that can receive signals.・Structure of the Invention In the present invention, a 1π (jumping detection circuit is provided to detect J3 data included in data transmitted from a broadcasting station for error discrimination), and an Mj roundabout of the data is detected. In this case, the subscriber must set up a program of iJ:, I, and i, data, and immediately perform the data manually.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. In FIG. 4, the same parts as those in FIG. 1 are given the same reference numerals and will be explained.

FIG. 3 shows the structure of data sent after being scrambled. In this system, reference data for error detection is added to pulse-like data sent from the broadcasting station to each subscriber, such as the subscriber address, permitted channel number, and permitted usage time, as shown in Figure 3. The configuration is transmitted from the broadcasting station 1 to each subscriber 4U as one data.

On the other hand, as shown in FIG. 4, each subscriber 3 has an error detection circuit that reads and detects whether the data is correct or not when the subscriber address is inputted and the above reference data is entered manually by the subscriber 3. 34, and when the error detection output of the error detection circuit 34 is inputted, a display 1 lights up to indicate a needle whose data is incorrect (and a control circuit 3 equipped with a data manual device).
5 will be newly added.

With this configuration, if an error 9 occurs in part of the data in FIG. 3 due to external conditions, the error detection circuit 3
This is detected at step 4, and the display word in the control circuit 36 is driven to light up using the detection output. Based on this, the subscriber
6 to input correct data, ie, channel number, usage permission time, etc., to the FM demodulation/descrambling device 32.

In this way, although it may be disadvantageous to the broadcasting station 11i111, there will be no complaints from the subscribers because they cannot watch the program that the subscriber wants. It should be noted that it is not necessary to inform subscribers of their own data for the above purpose.

Here, to explain in more detail an example of the data structure and error detection function in FIG. 3, in the pulse-like data structure shown in FIG. When the number of pulses is even, the reference data for error discrimination is (-11), and when the number of pulses is odd, the base data is set to rOJ.On the other hand, in the error detection circuit 34, other data other than the reference data If the number of data pulses is an even number, if the reference data "1" is read next, it will be detected as correct data, and if the basic data rOJ is read as "1", it will be detected as incorrect data. If the data other than the reference data is an odd number, set it in the opposite way.

In addition, these data can be detected using, for example, single error correction (one error correction IF), double error detector (two error detection), or double error correction (two error correction + I", ) + When used in conjunction with a correction iF method such as a triple error detector (three error detection), two or three or more errors can be discovered after one or two errors have been corrected. If the error occurs, the error will be detected more accurately.

Effects of the Invention As described above, according to the present invention, EJT'! Even if incorrect data is input under adverse conditions, the system detects this and allows the subscriber to input the correct data manually. , the subscriber will not suffer any disadvantage.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of a satellite broadcasting system, FIG. 2 is a schematic diagram illustrating conventional countermeasures against data errors, and FIG. 3 is an example of a satellite broadcasting receiver used in the present invention. FIG. 4 is a schematic diagram showing the structure of data, and FIG. 4 is a book diagram showing the structure of a satellite broadcast receiving apparatus according to an embodiment of the present invention. 1.5 broadcasting station, 2...satellite, 3--subscriber 14.
6--...SHF signal, 31 ``''' converter, 32...Fl' M demodulation/descrambling device, 33'°.゛...Telephone receiver, 34...Error detection circuit, 35--control t4+ circuit.

Claims (1)

[Claims] The error detection circuit includes reference data for error determination in pulse data such as subscriber addresses and permitted channel numbers, and detects whether or not the data including the reference data sent via the broadcasting satellite is correct. A satellite broadcast receiving apparatus provided to each subscriber and configured to allow the subscriber to set a correct data program based on the error detection output of the error detection circuit.