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Automatic gain control device and audio control system comprising same

An automatic gain control and intermediate frequency signal technology, applied in the field of control, can solve problems such as system noise and reduce the fidelity of stable signals, and achieve the effects of reducing signal distortion, increasing anti-interference ability, and improving fidelity

Active Publication Date: 2010-04-07
BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The inventor found in the process of realizing the present invention that the existing technical solution has at least the following defects: the accumulator will continue to accumulate, regardless of whether the input signal needs to adjust the amplitude, it will be affected by the AGC output, thereby bringing noise, which reduces the fidelity of the stable signal

Method used

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  • Automatic gain control device and audio control system comprising same
  • Automatic gain control device and audio control system comprising same
  • Automatic gain control device and audio control system comprising same

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Embodiment Construction

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0058] refer to Figure 4 , shows the structure diagram of the first embodiment of an automatic gain control device according to the present invention. The automatic gain control device 400 includes an extracting unit 410 , a first adding unit 420 , a moving average filter 430 , a locking circuit 440 , and an accumulator 450 .

[0059] The extraction unit 410 is configured to perform power extraction on the intermediate frequency signal, and obtain the instantaneo...

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Abstract

The invention discloses an automatic gain control device and an audio control system comprising the same. The automatic gain control device comprises an extraction unit, a first addition unit, a moving average filter, a locking circuit and an accumulator, wherein the extraction unit is used for carrying out power extraction on intermediate frequency signals, and acquiring a signal instantaneous power value; the first addition unit is used for subtracting the signal instantaneous power value from a target power value, and acquiring a signal instantaneous power difference value; the moving average filter is used for acquiring an average power difference value according to the signal instantaneous power difference value; the locking circuit is used for generating locking signals according to the average power difference value, and the locking signals are used for controlling the accumulator to be in a locking or unlocking state; and the accumulator is used for accumulating the average power difference value in the unlocking state, and outputting automatic gain control signals. The fidelity of steady signals is improved by additionally arranging the locking circuit to control the operation of the accumulator.

Description

technical field [0001] The invention mainly relates to the field of control, in particular to an automatic gain control device and an audio control system including the device. Background technique [0002] Analog TV audio or other audio signals are susceptible to noise interference, resulting in fluctuations in the volume of the sound, so a strong AGC (Automatic Gain Control, automatic gain control) device is required to ensure the stability of the sound and the constant size, thereby reducing distortion . [0003] refer to figure 1 , is a structural block diagram of a typical wireless IF receiver using an analog AGC device. Including low-noise amplifier, down-conversion, filter and adjustable amplifier, the RF (Radio Frequency, radio frequency) received by the antenna enters the adjustable amplifier after being processed by the low-noise amplifier, down-conversion and filter, and the intermediate frequency The receiver also includes a power detector, the input end of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/20
Inventor 桂文明
Owner BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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