CN101163220A

CN101163220A - Method of automatically detecting video output signal line of mobile phone

Info

Publication number: CN101163220A
Application number: CNA2006101170058A
Authority: CN
Inventors: 贾昌武
Original assignee: Shanghai Chenxing Electronics Science and Technology Co Ltd
Current assignee: Shanghai Chenxing Electronics Science and Technology Co Ltd
Priority date: 2006-10-11
Filing date: 2006-10-11
Publication date: 2008-04-16

Abstract

A method of automatic test of A/V output wire of cell phone includes the following procedures: S1. Selecting one testing port on a cell phone baseband as the testing spot of level condition, and equipping a pull-up resistor between an electricity source and the testing port inside the cell phone, keeping the logic level at the testing port high; S2. Inserting the audio signal wire and the video signal wire which are connected to a television respectively to correspondent cell phone ports, and connecting the testing port and an earth wire by a testing wire, making the logic level of the testing port low; S3. Testing the level of the testing port through a testing module equipped on the cell phone base; if the logic level is high, the audio signal output function of the cell phone is started up; if the logic level is low, the audio signal output function is turned off. The method enables the cell phone to automatically test if the A/V signal wire is inserted or extracted, greatly simplifying operation.

Description

The method of automatically detecting video output signal line of mobile phone

Technical field

The present invention relates to a kind of signal detecting method of mobile phone, particularly a kind of method of automatically detecting video output signal line of mobile phone.

Background technology

The S7188 of SimCom, S8388 series mobile phone has the function of the film of playing the MPEG4 form, and playing image can also be modulated into television signal.

During concrete the application, earlier mobile phone is arranged to the video display modulation output mode, inserts signal transmssion line then, be connected to television set, the film of so just can the handle machine sowing putting shows on television set.As user during without the video signal output function, withdraw from the video signal output mode earlier, pull out signal transmssion line again.

Do not have communication connected mode preferably at present between mobile phone and television set, do not have effective and efficient manner to detect video signal, and television set can not sent out request signal to mobile phone, so mobile phone can't detect video line and whether tone frequency channel wire inserts yet.And if monitor automatically by mobile phone, the consumed power of mobile phone is excessive, can't realize, so whole operations all to realize by the cellphone subscriber, can not realize operation automation.

Summary of the invention

Purpose of the present invention provides a kind of method of automatically detecting video output signal line of mobile phone, makes mobile phone easily and effectively to television set output video signal.

The objective of the invention is to be achieved through the following technical solutions:

A kind of method of automatically detecting video output signal line of mobile phone, it comprises step: a detection port on S1, the selected mobile phone baseband is as the test point of level state, and between the inner power supply of mobile phone and this detection port, a pull-up resistor is set, make the logic level at this detection port place remain high level; S2, the audio signal wire that will be connected with TV respectively and video signal cable insert corresponding mobile phone port, and with a detection line this detection port are connected with ground wire, make that the logic level at this detection port place is a low level; S3, the level of this detection port is just detected by a detection module that is arranged on the mobile phone baseband, if logic level is a high level, then the video signal output function in the mobile phone is opened, if logic level is a low level, then the video signal output function is closed.

Wherein, the Standard resistance range of this pull-up resistor is 10K-100K ohm.

Wherein, this detection port is a GPI/O port.

Positive progressive effect of the present invention is:

A kind of method of automatically detecting video output signal line of mobile phone makes that whether mobile phone can insert and extract by the Auto-Sensing video output signal line, has simplified operation greatly.

Description of drawings

Fig. 1 is the general structure schematic diagram of preferred embodiment of the present invention.

Fig. 2 is the circuit connection diagram of preferred embodiment of the present invention.

Fig. 3 is the pull-up resistor principle schematic of preferred embodiment of the present invention.

Fig. 4 is the detection port place level variable condition schematic diagram of preferred embodiment of the present invention.

Fig. 5 is the flow chart of the testing process of preferred embodiment of the present invention.

Embodiment

Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.

As Fig. 1-shown in Figure 5, a kind of method of automatically detecting video output signal line of mobile phone, it comprises step: S1, a GPI/O detection port 9 on selected mobile phone 1 baseband chip 2 is as the test point of level state, and between the inner power supply 4 of mobile phone and this detection port 9, a pull-up resistor 3 is set, made when should not use this video signal output function at ordinary times, level 11 remains height during detection port 9 places idle, the logic level that is detection port 9 places is 1, wherein the Standard resistance range of this pull-up resistor 3 is 10K-100K ohm, can not be burnt out when the short circuit with protection mobile phone internal circuit;

S2, will insert corresponding mobile phone port 8 with many audio signal wires and the video signal cable 10 on the mobile phone that TV is connected respectively, and this detection port is connected with ground wire 6 with a detection line 5, level 12 is for low when making the insertion at these detection port 9 places, and promptly the logic level at detection port 9 places is 0;

S3, be arranged at detection module on mobile phone 1 baseband chip 2 (figure does not show) by one, level to this detection port 9 just detects, if logic level is 1, then the video signal output function in the mobile phone is opened, and video signal outputed on the television set 7, if logic level is 0, then the video signal output function in the mobile phone is not opened.

When this detection line 5 is pulled out, then the current potential 13 of extracting of detection port 9 is low level, and logic level reverts to 0, and this detection module detects the potential change of detection port 9 this moment, the video signal output function of mobile phone 1 is closed in survey, and the picture that stops on the television set 7 shows.

Claims

1. the method for an automatically detecting video output signal line of mobile phone, it comprises step: a detection port on S1, the selected mobile phone baseband is as the test point of level state, and between the inner power supply of mobile phone and this detection port, a pull-up resistor is set, make the logic level at this detection port place remain high level; S2, the audio signal wire that will be connected with TV respectively and video signal cable insert corresponding mobile phone port, and with a detection line this detection port are connected with ground wire, make that the logic level at this detection port place is a low level; S3, the level of this detection port is just detected by a detection module that is arranged on the mobile phone baseband, if logic level is a high level, then the video signal output function in the mobile phone is opened, if logic level is a low level, then the video signal output function is closed.

2. the method for automatically detecting video output signal line of mobile phone according to claim 1 is characterized in that, the Standard resistance range of this pull-up resistor is 10K-100K ohm.

3. the method for automatically detecting video output signal line of mobile phone according to claim 1 is characterized in that, this detection port is a GPI/O port.