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Apparatus and method for detecting transmission mode of broadcast signal

A technology of broadcast signal and transmission mode, applied in transmission monitoring, transmission system, digital transmission system and other directions, can solve the problem of inaccurate reception of signal demodulation and other problems

Inactive Publication Date: 2007-05-02
LG ELECTRONICS INC
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Problems solved by technology

The length of the guard interval can vary with the transmission mode of the transmitted signal. If the broadcast receiver does not distinguish the transmission mode according to the transmitted signal, the receiver cannot accurately demodulate the received signal

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  • Apparatus and method for detecting transmission mode of broadcast signal
  • Apparatus and method for detecting transmission mode of broadcast signal
  • Apparatus and method for detecting transmission mode of broadcast signal

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Embodiment Construction

[0036] Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0037] For easy description of the present invention, a DMB-T system is shown below as an example of transmitting a signal using a TDS-OFDM modulation system. The frame structure of the broadcast signal varies with the transmission mode of the broadcast signal transmitted by the DMB-T system.

[0038] If a signal modulated by the TDS-OFDM modulation scheme used in the DMB-T system is received in the receiver, the receiver must detect the guard interval of the signal. The receiver can then perform additional signal processing.

[0039] FIG. 2 illustrates an example of the format of a signal frame to be transmitted according to a DMB-T transmitter. In particular, FIG. 2 illustrates a frame structure of a ...

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Abstract

The present invention is directed to a device for detecting a transmission mode of a broadcast signal and a method thereof. In order to detect the transmission pattern of the broadcast signal, a correlation value is calculated between the broadcast signal and a delayed signal of the broadcast signal; the correlation values ​​within a specific interval are accumulated. The peak value of the accumulated correlation value is detected by comparing the accumulated correlation value with a threshold value. The transmission pattern of the broadcast signal is detected by comparing the distance between the peak values ​​with a predetermined frame length. Through the embodiments of the device for detecting the transmission mode of the broadcast signal and the method thereof, the transmission of the broadcast signal can be effectively detected and the receiver of the broadcast signal can effectively process the broadcast signal.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2005-0079091 filed on Aug. 26, 2005, which is hereby incorporated by reference as if set forth in its entirety herein. technical field [0003] The invention relates to a device for detecting a transmission mode of a broadcast signal and a method for detecting the transmission mode of a broadcast signal. Background technique [0004] A new method for sending / receiving terrestrial digital TV broadcasting signals in China is proposed. This method is called terrestrial digital multimedia / television broadcasting (DMB-T) technology. [0005] In DMB-T, a new modulation scheme called Time Domain Synchronous Orthogonal Frequency Division Multiplexing (TDS-OFDM) is used. Like systems using cyclic prefix OFDM modulation schemes, DMB-T systems apply an Inverse Discrete Fourier Transform (IDTF) to the data being transmitted. However, unlike the cyclic prefix...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04J11/00H04B17/00
CPCH04L27/2666H04L27/2695
Inventor 辛钟雄
Owner LG ELECTRONICS INC
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