KR950012670B1 - D-mac/d2-mac automatic conversion method - Google Patents

Abstract

calculating a bit error ratio of a received broadcasting signal, assuming that the received broadcasting signal is a D-MAC pattern signal; comparing the calculated bit error ratio with a bit error ratio permitting value of the stored broadcasting pattern and if the bit error ratio is less than the bit error ratio permitting value, determining the received broadcasting signal as the D-MAC pattern signal; if the bit error ratio is greater than the bit error ratio permitting value, assuming the received broadcasting signal as the D2-MAC pattern signal; comparing the bit error ratio of the received broadcasting signal with a bit error ratio permitting value of the D2-MAC pattern and if the bit error ratio is less than the bit error ratio permitting value, determining the received broadcasting signal as the D2-MAC pattern signal; and if the bit error ratio is greater than the bit error ratio permitting value, repeating the select procedure of the broadcasting signals in the broadcasting patterns.

Description

D-MAC / D2-MAC Automatic Selection Method

1 is a diagram schematically showing a hardware configuration used for the description of the D-MAC / D2-MAC automatic selection method according to the present invention.

2 is a flowchart illustrating a D-MAC / D2-MAC automatic selection method according to the present invention.

* Explanation of symbols for main parts of the drawings

10: receiver 20: signal processing and BER calculation unit

30: BER allowable memory unit 40: broadcast selection output unit

The present invention relates to a D-MAC / D2-MAC automatic selection method, and more particularly, to automate the D-MAC / D2-MAC system based on the clock speed difference between the D-MAC and D2-MAC digital signals. D-MAC / D2-MAC type automatic selection method to select with.

Currently, for the D-MAC and D2-MAC methods proposed for the broadcasting method of satellite television, for example, by using a switch provided in the television system, a manual configuration or a hardware configuration must be selected for the television system. .

Therefore, when the D-MAC method and the D2-MAC method are manually selected, the labor of the viewer is required to select the broadcasting method, and when the broadcasting method is selectively switched by the hardware configuration, the labor of the viewer is reduced. Although possible, the problem arises that the cost of the television system increases.

Accordingly, the present invention has been made in view of the above circumstances, and D is automatically configured to select the D-MAC method and the D2-MAC method by using a difference in clock speeds of the digital signals of the D-MAC method and the D2-MAC method. -MAC / D2-MAC method to provide automatic selection method.

In order to achieve the above object, according to the present invention, in a television system capable of compatible reception of D-MAC / D2-MAC type broadcast signals, it is assumed that the received broadcast signal is a D-MAC type signal. Calculating the bit error rate of the received broadcast signal; comparing the calculated bit error rate with the assumed bit error rate allowance of the broadcast method; and if the bit error rate of the broadcast method being received is smaller than the allowed bit error rate of the broadcast method. Determining the received broadcast signal as a D-MAC signal; and if the bit error rate of the received broadcast signal is greater than the allowable bit error rate of the stored broadcast method, assuming that the received broadcast signal is a D2-MAC signal. The bit error rate of the received broadcast signal is compared with the bit error rate allowance of the D2-MAC method. If the error rate is smaller than the allowable error rate, the received broadcast signal is determined as a D2-MAC type signal. If the error rate is greater than the bit error rate allowance of the D2-MAC method, the second process includes repeating the selection process of the broadcast method. A configured broadcast method automatic selection method is provided.

When receiving the broadcast signal according to the present invention, the bit error rate is calculated by assuming the broadcast signal is a new hole of D-MAC broadcasting, and if the bit error rate is smaller than the allowable range in comparison with the bit error rate allowance of the D-MAC method, D- If the bit error rate is larger than the allowable range, it is assumed to be the D2-MAC method. If the bit error rate is smaller than the allowable range compared to the bit error rate allowance of the D2-MAC method, it is possible to receive the signal in the D2-MAC method. Done.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a hardware configuration used to explain the D-MAC / D2-MAC method automatic selection method according to the present invention. Reference numeral 10 denotes a D-MAC method or a D2-MAC method. 20 is a clock speed (20, 25M) of the digital signal of the D-MAC or D2-MAC method and the clock speed of the digital signal of the D2-MAC method in the broadcast signal received through the receiver 10 , 125M) is a signal processing and BER calculation unit for calculating a bit error ratio (BER) based on the difference. The signal processing and BER calculating unit 20 first calculates the BER by assuming that the broadcast signal received by the receiving unit 10 is a D-MAC type signal, and if the BER of the calculation result is smaller than the allowable range, D; If the BER of the calculation result is larger than the BER allowance of the D-MAC method, the BER is calculated based on the D2-MAC method. If the BER is smaller than the BER allowance of the D2-MAC method, It is decided by signal.

30 is a memory unit for storing allowable data of the BER calculation performed by the signal processing and BER calculation unit 20, and 40 is selected according to the signal processing and BER calculation results performed by the signal processing and DER calculation unit 20. Broadcast selection output unit.

Here, according to the present invention, the hardware configuration shown in FIG. 1 is a hardware configuration applied to the description of the D-MAC / D2-MAC automatic selection method of the present invention, which is a decoder for decoding a broadcast signal in a television system. It is a figure which made the function of means block.

Next, the D-MAC / D2-MAC method automatic selection method according to the present invention shown in the flowchart of FIG. 2 will be described with reference to the above configuration.

First, the signal processing and BER calculator 20 calculates the signal processing and the BER in step S25 by assuming that the broadcast signal received through the receiver 10 in step S21 is a D-MAC type signal. . That is, the signal processing and BER calculation unit 20 calculates the clock speeds 20 and 25M of the digital signal in the D-MAC method, and stores the BER tolerance value (N: for example) stored in the BER tolerance memory unit 30 in step S27. 1000). In this case, if the received broadcast signal is a D-MAC scheme, the error of the BER becomes smaller than the allowable value (N) range, whereas if the received broadcast signal is not the D-MAC scheme, the BER calculation result is larger than the allowable range (N) range. do.

Therefore, when the comparison result of the BER calculation in step S27 is smaller than the allowable range for the D-MAC scheme, the received broadcast signal is determined as the D-MAC scheme in step S29, and then the process returns to step S25.

On the other hand, if the BER calculation result is greater than or equal to the allowable value N of the D-MAC method, the signal processing and BER calculation unit 20 assumes that the broadcast signal currently received in step S31 is the D2-MAC method and step S33. We calculate signal processing and BER in D2-MAC with digital clock clock speed of 10.125M. Subsequently, in step S35, the BER calculation result is compared with the BER allowable value (N), and if the BER calculation result is smaller than the allowable value (N) range, the broadcast signal currently received in step S37 is determined to be a signal of the D2-MAC method, and then step S33 is performed. On the other hand, if it is larger than the allowable value range, the process returns to step S25 to repeat the subsequent operation steps.

In this way, whether the broadcast method of the input broadcast signal is a D-MAC method or a D2-MAC method is automatically selected and transmitted through the broadcast selection output unit 40 to a later hardware configuration to perform subsequent processing.

As described above, according to the present invention, since the broadcasting method of the input signal is automatically selected and determined based on the clock speed difference between the digital signals of the D-MAC method and the D2-MAC method, the broadcasting method selection method of the viewer becomes unnecessary. Therefore, the viewer's convenience and viewing satisfaction can be further improved.

Claims (2)

A television system capable of receiving a D-MAC / D2-MAC broadcast signal in a compatible manner, the method comprising: assuming a received broadcast signal as a D-MAC signal and calculating a bit error rate of the received broadcast signal; Comparing the calculated bit error rate with the bit error rate allowance of the stored broadcast method, if the bit error rate of the received carrier method is smaller than the bit error rate allowance of the assumed broadcast method, the received broadcast signal is determined as a D-MAC method signal. And a step of assuming that the bit error rate of the received broadcast signal is a D2-MAC type signal if the bit error rate of the received broadcast signal is larger than the assumed bit error rate tolerance of the broadcast method, and the bit error rate and D2-MAC of the received broadcast signal. If the bit error rate of the received broadcast signal is smaller than the bit error rate allowance of the D2-MAC method, the received broadcast signal is D2-M. While the D-MAC / D2-MAC method includes determining a signal of the AC method and having a bit error rate allowance greater than that of the D2-MAC method, the second process includes repeating the selection process of the broadcast method. Auto selection method. The method of claim 1, wherein the bit error rate is calculated based on a clock signal difference between the digital signals of the first and second broadcast methods.