CN101394492B

CN101394492B - Resolving method and device for four vertical line appearance on Anyka analog television image in mobile phone

Info

Publication number: CN101394492B
Application number: CN200710046241XA
Authority: CN
Inventors: 晏春海
Original assignee: Shanghai Simcom Ltd
Current assignee: Shanghai Simcom Ltd
Priority date: 2007-09-21
Filing date: 2007-09-21
Publication date: 2013-01-09
Anticipated expiration: 2027-09-21
Also published as: CN101394492A

Abstract

The invention relates to a method and a circuit structure for solving four vertical lines which exist in an Anyka simulated television image of a mobile phone, the defects are mainly caused by too high DMA communication reading and writing frequency between an integrated circuit AK3224 and SDRAM, the solution is to improve the number of frames of a source image which is output by the integrated circuit TLG1100 that is connected with an antenna and reduce the working frequency of the SDRAM, thereby increasing the number of the frames of the source image from the original 25 frames/second to 50 frames/second and reducing the DMA transmission frequency from the original 84MHz to 42 MHz. Therefore, the method and the circuit structure can not only maintain the original smooth image transmission, but can also overcome the interference caused by too high SDRAM reading and writing speed.

Description

Solution and the device of four vertical lines appears in the triumphant simulated television image of peace in the mobile phone

Technical field

The present invention relates to image effect improvement method and the circuit structure of simulated television on a kind of mobile phone, specifically, is method and the circuit structure of eliminating four vertical lines of image appearance of simulated television on the triumphant platform of peace.

Background technology

At present, the analog signal Digital Video Broadcasting Handheld quietly goes on the market at mobile phone market, the analog signal Digital Video Broadcasting Handheld need not to pass through the mobile network, can directly use the antenna receiver received television signal, analog television mobile phone can take full advantage of existing infrastructure and programme content, can effectively utilize existing resource, there is ready-made simulation open circuit signaling in each city at present, can directly receive.Pacify the TLG1100 simulated television scheme that has also added safe scape on the triumphant platform.TLG1100 is the chip with high-performance, low-power consumption; It contains broadcast receiver and TV functions, and TV is supported the NTSC/PAL standard; Video output streams is followed CCIR/ITU 601 forms.TLG1100 simulated television scheme is pretty good at the platforms such as the MTK picture of coming on TV, but four vertical lines appear in TLG1100 simulated television picture easily on the triumphant platform of peace, and especially when TV signal is bad, and these four line positions are fixed.Be easy to occur the phenomenon of four vertical lines when for example news synthesizer channel in Shanghai is play: Fig. 1 is the television image that screenshotss get off, and clearly sees 4 vertical lines side by side on figure.Fig. 3 is the fundamental diagram that produces this phenomenon: this problem is the exclusive problem of the triumphant platform of peace, TLG1100 by antenna reception to image send AK3224 to, AK3224 will show a two field picture of 320 * 240 pixel sizes, AK3224 is to be undertaken by the DMA passage with communication between the SDRAM, but DMA buffer is large not, can only transmit 64bytes to SDRAM at every turn, like this, delegation needs 5 bursts, because operating frequency is at 84MHz, SDRAM read-write at a high speed can be disturbed the signal that inputs to TLG1100, has so just produced the phenomenon of four lines.

Summary of the invention

The object of the invention is to overcome the defective that high speed SDRAM read-write of the prior art affects the signal of TLG1100, solve the problem that occurs four vertical lines on the analog television mobile phone picture that exists in the prior art.

The method of four vertical lines of elimination simulated television of the present invention is as follows:

(1) improves the source images frame number that TLG1100 exports, bring up to 50 frame per seconds from 25 frame per seconds;

(2) operating frequency of reduction SDRAM drops to 42MHz, and the read or write speed of SDRAM reduces by one times than original like this;

The first step improves the source images frame number of TLG1100 output, and the source images frame number of TLG1100 output is divided into two kinds of 25 frame per seconds and 50 frame per seconds; Original SDRAM operating frequency is when 84MHz, and the source images frame number is 25 frame per seconds, the image that AK3224 receives or smoothness; It is that the image that AK3224 receives when dropping to 42MHz for the SDRAM operating frequency still keeps smooth that the source images frame number of TLG1100 output is brought up to 50 frame per seconds.

Second step reduces the operating frequency of SDRAM, drops to 42MHz, the read or write speed of SDRAM reduces half than operating frequency when the 84MHz like this, and the aerial signal that inputs to TLG1100 be there is no impact, the also cancellation of four lines of simulated television.

Adopt the method for the invention, compared with prior art, obtained that television image is smooth, picture quality is improved normally, saved and revised the cost that hardware components causes.

Description of drawings

Fig. 1 is that four line screenshotss views appear in the simulated television picture.

Fig. 2 is normal simulated television screen printed image view.

Fig. 3 is the fundamental diagram when four lines occurring;

Fig. 4 is the fundamental diagram of four lines of cancellation.

Embodiment

The below provides a preferred embodiment of the present invention according to Fig. 3 and Fig. 4, and is described in detail, so that those skilled in the art are easier to understand method characteristic of the present invention, rather than is used for limiting scope of the present invention.

As shown in Figure 3, the operation principle of four lines appears in simulated television: TV signal is input to TLG1100 through antenna, TLG1100 exports the source images of 360*270 pixel of 25 frame/seconds to AK3224, what AK3224 exported is the image of 320*240 pixel, mutual by the DMA passage between AK3224 and the SDRAM, because the DMA buffer capacity of AK3224 is 64bytes, so 320 pixels of delegation need be divided 5 transmission, 5 burst namely, every burst send 64bytes, operating frequency is when 84MHz like this, and SDRAM read-write at a high speed just affects the input signal of antenna.Fig. 1 is the TV screenshotss that four vertical lines are arranged when the 84MHz operating frequency, on the figure mark place of line 1, line 2, line 3, line 4 be exactly four vertical lines.

Fig. 4 is for the read-write meeting potato masher antenna signal of Fig. 3 high speed SDRAM and improved operation principle: an aspect mainly is that the operating frequency of AK3224 is reduced to 42MHz, because operating frequency reduces by one times, the SDRAM read-write is on the basic just not impact of aerial signal; Because operating frequency has reduced, and can have influence on the smoothness of television image, another aspect is exactly that the source images of TLG1100 output was brought up to for 50 frame/seconds, has so just guaranteed the fluency of picture.

In sum, the solution of four vertical lines of the triumphant simulated television of peace that the present invention proposes is a kind ofly to need not to revise at hardware aspect, only need the software aspect to adjust and just can realize television image smoothness, the normal solution of picture quality or only need adjust Reasonable Parameters at circuit hardware cooperating, can reach and improve quality index.

Claims

1. pacify the solution that four vertical lines appear in triumphant simulated television image for one kind, comprise step:

The source images frame number of S1, raising TLG1100 output, the operating frequency of S2, reduction SDRAM.

2. the solution of four vertical lines appears in the triumphant simulated television image of peace according to claim 1, it is characterized in that, the source images frame number of described raising TLG1100 output is by changing 50 frame per seconds 25 frame/seconds into its output frame number.

3. the solution of four vertical lines appears in the triumphant simulated television image of peace according to claim 1, it is characterized in that, the operating frequency of described reduction SDRAM is that its read or write speed is reduced to 42MHz by original 84MHz.

4. one kind is improved the circuit structure of pacifying triumphant simulated television picture quality, it is characterized in that, this circuit structure comprises integrated circuit TLG1100, integrated circuit AK3224 and integrated circuit SDRAM, wherein, integrated circuit TLG1100 and integrated circuit AK3224 transmit with 50 frames/second and connect, and integrated circuit AK3224 and integrated circuit SDRAM transmit with 42MHzDMA.