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Method and apparatus for digital automatic gain control

A technology of automatic gain control and equipment, which is applied in the field of equipment, can solve the problem of increasing memory capacity and achieve the effect of reducing size

Inactive Publication Date: 2007-11-28
LG ELECTRONICS INC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0012] 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 digital automatic gain control
  • Method and apparatus for digital automatic gain control
  • Method and apparatus for digital automatic gain control

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Embodiment Construction

[0030] The examples are for illustration only and not for limitation. The matters illustrated in the description are provided to facilitate a comprehensive understanding of certain exemplary embodiments of the invention disclosed in conjunction with the accompanying drawings. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the exemplary embodiments described herein can be made without departing from the scope and spirit of the claimed invention. Accordingly, this application is adapted to explain its general principles and concepts in the most useful and simple manner.

[0031] FIG. 1 is a block diagram illustrating the structure of a frame whose guard interval is 1 / 9, among transmission frames transmitted from DTMB.

[0032] Referring to FIG. 1, a transmission frame transmitted from DTMB includes a frame sync and a frame body as a data interval.

[0033] Frame synchronization includes PN sequence. The PN sequence use...

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Abstract

According to the device and method for the automatic gain control, the present invention controls the received signal intensity to a constant level by the receiver which is used to receive the exerted digital broadcast signal. With this end in view, it compensates the incoming signal received by the gain error detector by the compensating signal, detects the gain error, accumulate the gain error detected by the loop filter, and the compensating signal generator compensates the accumulated gain error by the prescheduled penalty function to generate the compensating signal, and compensates the received incoming signal detected by the gain error detector according to the generated compensating signal.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims priority from Korean Application No. 10-2006-0020136 filed on March 2, 2006, the entire disclosure of which is hereby incorporated by reference. technical field [0003] 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 receiving the broadcast signal. Background technique [0004] The following description generally relates to an automatic gain control (AGC) apparatus and method for automatically adjusting the gain of a broadcast signal received from a receiver receiving the broadcast signal. [0005] Currently, digital broadcasting is being standardized locally based on a variety of technologies. For example, broadcast standards discussed in China include Digital Terrestrial Multimedia Broadcasting (DTMB). The ...

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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