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Automatic gain control method, apparatus and receiver for mobile digital multimedia broadcast

A technology of automatic gain control and multimedia broadcasting, applied to color TV parts, TV system parts, TVs, etc., can solve the problems of slow adjustment speed, frequent adjustment times, and failure to guarantee normal AGC adjustment, etc., to achieve adjustment speed Fast, consistent, less adjustment times

Inactive Publication Date: 2009-08-05
INNOFIDEI TECHNOLOGIES INC
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Problems solved by technology

[0006] Because the existing AGC method adjusts step by step according to the preset step size, the adjustment speed is relatively slow, and the number of adjustment times is relatively frequent. In the environment of fast fading channels, the adjustment pace usually cannot keep up with the changes of fast fading channels. Guarantee the normal adjustment of AGC, so can not guarantee to achieve an ideal multimedia playback effect

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  • Automatic gain control method, apparatus and receiver for mobile digital multimedia broadcast
  • Automatic gain control method, apparatus and receiver for mobile digital multimedia broadcast
  • Automatic gain control method, apparatus and receiver for mobile digital multimedia broadcast

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Embodiment Construction

[0043] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0044] Based on the characteristics of CMMB multi-slot broadcast, it is only necessary to perform AGC in the designated time slot. At the same time, in order to improve the sensitivity and stability of the CMMB system, the receiving system can be turned on one or several time slots in advance for AGC control to ensure that the signal power is basically stable when receiving in the designated time slot.

[0045] figure 2 It is the flowchart of the automatic gain control method of CMMB of the present invention, as figure 2 Shown, the inventive method comprises the following steps:

[0046] Step 200: Obtain the current signal strength of the radio frequency signal according to the signal strength of the baseband signal and the current gain of the tuner...

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Abstract

The invention discloses an automatic gain control method of mobile digital multimedia broadcasting, a device and a receiver. The invention adjusts the gain of a tuner by comparing the signal strength of a current radio-frequency signal and the step size of a preset target range. The step size used for adjusting the gain of the tuner is directly relevant to the deviation of the current radio-frequency signal strength from the target range. Therefore, the adjustment speed is high and the adjustment time is less; and in a fast-fading channel environment, the consistency of the adjustment pace and the variation of the fast-fading channel and normal adjustment of the AGC are guaranteed, thereby guaranteeing to achieve an ideal multimedia playing effect.

Description

technical field [0001] The invention relates to the field of mobile digital multimedia broadcasting, in particular to an automatic gain control method, device and receiver for mobile digital multimedia broadcasting. Background technique [0002] Mobile digital multimedia broadcasting is a broadcasting system covering a wide range of user terminals. Through satellite and terrestrial wireless broadcasting, it provides small screen, small size, mobile and portable user terminals, such as mobile phones, personal digital assistants (PDA, Personal Digital Assistant), MP3, MP4, digital cameras, notebook computers, etc., receive multimedia broadcasting programs and information services anytime and anywhere. [0003] China Mobile Multimedia Broadcasting (CMMB, China Mobile Multimedia Broadcasting) is a technical standard for mobile digital multimedia broadcasting proposed by China. The following takes the CMMB system as an example to introduce the receiving system of mobile digital m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/52
Inventor 张辉王西强魏茂
Owner INNOFIDEI TECHNOLOGIES INC
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