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Method and apparatus for automatic gain control

A technology of quadrature amplitude modulation and broadcasting signals, which is applied in the field of equipment, can solve the problem of increasing memory capacity, and achieve the effect of reducing size

Active Publication Date: 2011-09-21
LG ELECTRONICS INC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0011] The compensation signal according to the accumulated gain error value is expressed in the form of an exponential function, where the compensation signal is pre-stored in the memory as a look-up table, and the compensation signal corresponding to the accumulated gain error value is read out from the memory, and output the compensation signal, which will increase the capacity of the memory

Method used

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  • Method and apparatus for automatic gain control
  • Method and apparatus for automatic gain control

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Embodiment Construction

[0029] The embodiments are only for illustration but not for limitation. The matters exemplified in this description are provided to help a comprehensive understanding of certain exemplary embodiments of the present invention disclosed in conjunction with the accompanying drawings. Therefore, those of ordinary skill in the art will recognize that various changes and modifications can be made to the exemplary embodiments described herein without departing from the scope and spirit of the claimed invention. Therefore, this application is suitable for explaining its general principles and concepts in the most useful and simple way.

[0030] figure 1 It is a block diagram illustrating the structure of a frame whose guard interval is 1 / 9 among the transmission frames transmitted from DTMB.

[0031] reference figure 1 , The transmission frame transmitted from DTMB includes frame synchronization and the frame body as a data interval.

[0032] Frame synchronization includes PN sequence. T...

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Abstract

The invention relates to a method and apparatus for automatic gain control, capable of controlling the intensity of a signal applied to and received from a receiver for receiving a digital broadcast signal to a constant level. An input signal received by a gain error detector is compensated by a compensation signal to detect the gain error and the detected gain error is accumulated by a loop filter. The accumulated gain error value is compensated by a compensation signal generator based on a preset compensation function to generate a compensate signal and the received input signal detected bythe gain error detector is compensated according to the generated compensation signal.

Description

[0001] This application is a divisional application of the invention titled "Apparatus and Method for Automatic Gain Control" (application number: 200710128885.3; application date: March 2, 2007). Technical field [0002] The present invention relates to an apparatus and method for automatic gain control, and more particularly, to an apparatus and method for automatically adjusting the gain of a broadcast signal received from a receiver that receives a broadcast signal. Background technique [0003] The following description generally relates to an automatic gain control (AGC) device and method for automatically adjusting the gain of a broadcast signal received from a receiver that receives the broadcast signal. [0004] Currently, digital broadcasting is being locally standardized based on multiple technologies. For example, broadcasting standards discussed in China include Digital Terrestrial Multimedia Broadcasting (DTMB). The DTMB standard under discussion uses a new modulation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/52H04N5/44H04L27/26H04N7/00
CPCH03G3/20H03G3/28H04N5/52H04H2201/11H04N21/4425
Inventor 金炫哲
Owner LG ELECTRONICS INC
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