CN101854423B

CN101854423B - Shared interface deice of CMMB (China Mobile Multimedia Broadcasting) antenna and earphone and identifying method thereof

Info

Publication number: CN101854423B
Application number: CN200910048792.9A
Authority: CN
Inventors: 郑爱群
Original assignee: Shanghai Simcom Ltd
Current assignee: Shanghai RemoWireless Communication Technology Co.,Ltd.
Priority date: 2009-04-03
Filing date: 2009-04-03
Publication date: 2014-08-13
Anticipated expiration: 2029-04-03
Also published as: CN101854423A

Abstract

The invention discloses a shared interface deice of a CMMB antenna and an earphone and an identifying method thereof. The shared interface device comprises an analog switch, a 3.5mm earphone socket and a 10pin earphone interface, wherein the 3.5mm earphone socket is used for inserting a 3.5mm earphone or the CMMB antenna and connected with the output end of the analog switch, and the 10pin earphone interface is used for inserting a 10pin earphone and connected with the input end of the analog switch. The invention can realize the functions of sharing the CMMB antenna and a 3.5mm earphone interface and automatically identifying the CMMB antenna and the 3.5mm earphone by a mobile phone system, thereby lowering the cost.

Description

Shared interface device and the recognition methods thereof of CMMB antenna and earphone

Technical field

The present invention relates to a kind of handset port technology, particularly relate to shared interface device and the recognition methods thereof of a kind of CMMB antenna and earphone.

Background technology

CMMB (China Mobile Multimedia Broadcasting, China Mobile's DMB) adopt the digital technologies such as advanced coding, compression, modulation, aim at 7 cun of portable receiving terminals of following size screen TV services is provided, there is the not available technical characterstics of conventional digital TV such as mobile reception, efficient power saving.A hand-held display terminal, adds CMMB receiving chip, and an additional CMMB antenna, just can become a CMMB terminal, just can realize the function that receives radio and television services whenever and wherever possible.

So-called 3.5mm interface: the i.e. standard earplug interface of walkman, MP3, CD player and computer headset etc.3.5mm earphone will be got well more than 2.5mm interface earphone the playback effect of music, and has also been widely used on multiple music walkman at present.On mobile phone, compatible 3.5mm earphone socket is a good attraction, and existing mobile phone products is commonly and uses 10pin (pin) interface, compatible downloading wire, USB line and earphone cord.But concerning user, the effect that the earphone cord of 10pin is listened to the music does not have too many feature.If compatible 3.5mm earphone socket, user can use professional 3.5mm earphone to obtain good music effect.

But in the market, CMMB antennal interface and 3.5mm earphone interface do not integrate.Due to cell phone mainboard limited space, mobile phone uses two interfaces to realize respectively CMMB antennal interface and 3.5mm earphone interface is more difficult, so if need compatible CMMB function and 3.5mm earphone interface, must solve the problem of identification automatically.

Summary of the invention

The technical problem to be solved in the present invention is in order to overcome the defect that in prior art, CMMB antennal interface and 3.5mm earphone interface can not integrate, shared interface device and recognition methods and the recognition methods thereof of a kind of CMMB antenna and earphone are provided, it can realize CMMB antennal interface and the shared function of 3.5mm earphone interface, and realizes the function that cell phone system is identified CMMB antenna and 3.5mm earphone automatically.

The present invention solves above-mentioned technical problem by following technical proposals: the shared interface device of a kind of CMMB antenna and earphone, it is characterized in that, it comprises an analog switch, 3.5mm earphone socket and 10pin earphone interface, this 3.5mm earphone socket is for inserting 3.5mm earphone or CMMB antenna and being connected with the output of analog switch, and this 10pin earphone interface is for inserting 10pin earphone and being connected with the input of analog switch.

Preferably, this 3.5mm earphone socket has six pins.

Preferably, this CMMB antenna inserts after 3.5mm earphone socket, and first three pin of 3.5mm earphone socket is unsettled, rear three pin ground connection.

Preferably, this CMMB antenna is divided into three sections, and the radius of second segment is 2.5mm.

Preferably, the first paragraph of this CMMB antenna be shaped as polygon, being shaped as of second segment and the 3rd section is cylindric.

Preferably, this 3.5mm earphone inserts after 3.5mm earphone socket, and the first pin of this 3.5mm earphone socket is R channel, and the second and the 3rd pin is unsettled, and the 4th pin is L channel, and the 5th and the 6th pin is ground connection.

Another technical scheme of the present invention is: the recognition methods of the shared interface device of a kind of CMMB antenna and earphone, and it is identified and is comprised the following steps by three interrupt signals:

S1: insert 10pin earphone or 3.5mm earphone or CMMB antenna and produce interrupt signal;

S2: interrupt signal detected by a baseband processing chip;

S3: whether detect the first interrupt signal is low level, low level if, 3.5mm earphone socket has 3.5mm earphone or CMMB antenna to insert, and performs step S5, if the first interrupt signal is high level, performs step S4;

S4: continuing to detect whether the 3rd interrupt signal is low level, if low level judges that 10pin earphone inserts 10pin earphone interface, is high level if the 3rd interrupt signal detected, turns back to step S2, continues to detect interrupt signal;

S5: if the first interrupt signal is low level, whether be high level, if the second interrupt signal is high level, perform step S6 if continuing the second interrupt signal, if the second interrupt signal is low level, perform step S7;

S6: continue to detect whether the 3rd interrupt signal is low level, if low level judges that CMMB antenna inserts 3.5mm earphone socket; If the 3rd interrupt signal is high level, judge that CMMB antenna inserts 3.5mm earphone socket and 10pin earphone inserts 10pin earphone interface;

S7: continue to detect whether the 3rd interrupt signal is low level, if low level judges that 3.5mm earphone inserts 3.5mm earphone socket and 10pin earphone inserts 10pin earphone interface; If the 3rd interrupt signal is high level, judge that 3.5mm earphone inserts 3.5mm earphone socket.

Preferably, the priority of this first interrupt signal is greater than the priority of the second interrupt signal, and the priority of this second interrupt signal is greater than the priority of the 3rd interrupt signal.

Preferably, when this second interrupt signal is low level, analog switch is opened; When this second interrupt signal is high level, analog switch cuts out.

Preferably, when this second interrupt signal is low level, this 3.5mm earphone inserts 3.5mm earphone socket.

Positive progressive effect of the present invention is: the present invention not only has the function of regular handset, can also carry out CMMB receiving and use 3.5mm ear-phone function, thereby having reduced cost.

Accompanying drawing explanation

Fig. 1 is mobile phone concrete structure schematic diagram of the present invention.

Fig. 2 is the shared interface device overall structure schematic diagram of CMMB antenna of the present invention and earphone.

Fig. 3 is the schematic diagram of 3.5mm earphone socket of the present invention.

Fig. 4 is the structural representation of CMMB antenna of the present invention.

Fig. 5 is for adopting as the flow chart of the recognition methods of Fig. 2 shared interface device.

Embodiment

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

As shown in Figure 1, mobile phone of the present invention comprises mobile phone base band chip 11, CMMB DSP (DigitalSignal Processing, digital signal processor) chip 12, LCD MODULE 13 (LCM, LCDModule), T flash memory (Flash) card 14, CMMB chip 15, CMMB antenna 16, 3.5mm earphone 17 and shared interface device 18, wherein this mobile phone base band chip 11 is connected with T flash card 14 with CMMB dsp chip 12, CMMB dsp chip 12 is connected with CMMB chip 15 with LCD MODULE 13, CMMB dsp chip 12 is controlled CMMB chip 15 and is realized CMMB function, CMMB chip 15 receives CMMB signal by CMMB antenna 16, through processing, transfer data to CMMB dsp chip 12, refresh in LCD MODULE 13, thereby watch CMMB TV programme.By CMMB dsp chip 12, can realize Real files in stream media Audio and Video plays, by CMMB dsp chip 12 and CMMB chip 15, can realize CMMB receiving, this mobile phone base band chip 11 comprises graphics processing unit 111, Data Control interface 112 and audio treatment unit 113, Data Control interface 112 by baseband processing chip 11 carries out the Play Control of CMMB dsp chip 12 and transfer of data, video interface by CMMB dsp chip 12 is connected on the graphics processing unit 111 of baseband processing chip 11, realize the video playback of RMVB file, by audio treatment unit 113, realizing audio frequency plays.

CMMB antenna 16 can be connected with shared interface arrangement 18 with 3.5mm earphone 17, this shared interface device 18 is also connected with audio treatment unit 113 with CMMB chip 15, the cell phone system standardized 3.5mm earphone 17 of arranging in pairs or groups has brought convenience to consumer, user can use the 3.5mm earphone of standard, obtaining good music enjoys, insertion 3.5mm earphone can carry out music, earphone is made a phone call or listen to FM, and it is divided into syllogic, is respectively L channel, R channel and ground.Wherein L channel, R channel connect respectively 32 ohm to ground at earphone end; CMMB antenna 16 can receive CMMB signal, and CMMB antenna is an integrated antenna, integral ground.As shown in Figure 2, shared interface device 18 comprises an analog switch 181,3.5mm earphone socket 182 and 10pin (pin) earphone interface 183, the first, the 4th pin of 3.5mm earphone socket 182 is connected with output OUT1, the OUT2 of analog switch 181 respectively, and 10pin (pin) earphone interface 183 is connected with input IN1, the IN2 of analog switch 181.

Wherein as shown in Figure 3, before not inserting 3.5mm earphone or CMMB antenna, the first pin 1 of 3.5mm earphone socket and the second pin 2 interconnect the pin of 3.5mm earphone socket, the 3rd pin 3 and the 4th pin 4 interconnection; Insert after 3.5mm earphone or CMMB antenna, the first pin 1 and the second pin 2 disconnect, and the 3rd pin 3 and the 4th pin 4 disconnect, and detect to insert and can select the 1st, 4,6 pins as interrupting detection signal.But from the definition of CMMB antenna and 3.5mm earphone, on hardware, to tell 0 ohm and 32 ohm more difficult, can only tell interface and insert, but can not identify CMMB antenna and 3.5mm earphone.In order to address this problem, as shown in Figure 4, CMMB antenna is first paragraph 41, second segment 42 and the 3rd section 43 respectively, from trying every possible means in shape of CMMB antenna, the shape of CMMB antenna second segment 42, toward inside contracting, is changed into radius 2.5mm from radius 3.5mm, thereby guarantees can not touch the first pin 1 at the fashionable second segment of CMMB connection of antenna, thereby the first pin 1 is NC (unsettled or do not connect No Connection).Due to the CMMB antenna after improvement, the diameter of second segment 42 has changed 2.5mm into from 3.5mm, the contact area of antenna and 3.5mm earphone socket reduces, antenna is more loose after inserting, can in socket, rotate, therefore determine the shape of first paragraph 41 to make polygon (such as pentagon etc.), increase frictional force, antenna is fixed well in earphone base, and it is original cylindric that the shape of second segment 42 and the 3rd section 43 still keeps.

Like this, it is as shown in table 1 below that CMMB antenna and 3.5mm earphone heads are inserted rear pinout difference:

Table 1CMMB antenna and 3.5mm earphone insert the annexation of rear socket pin

The pin of 3.5mm earphone socket

1

2

3

4

5

6

Insert CMMB antenna

NC

GND

Insert 3.5mm earphone

R channel

NC

L channel

GND

Identification CMMB antenna and earphone

Detect and insert

Wherein, as described in Table 1, CMMB antenna and 3.5mm earphone all comprise three sections, and CMMB antenna is inserted after 3.5mm earphone socket, and the first to the 3rd pin of 3.5mm earphone socket is unsettled (NC), and the 4th to the 6th pin is ground connection (GND); And 3.5mm earphone is inserted after 3.5mm earphone socket, the first pin of 3.5mm earphone socket is R channel, and the second and the 3rd pin is unsettled (NC), and the 4th pin is L channel, and the 5th and the 6th pin is ground connection (GND).

In order to identify CMMB antenna, 10pin earphone and 3.5mm earphone, insert, need to use three interrupt signals.As shown in Figure 3, the first interrupt signal EINT_3.5 connects the 6th pin 6 of 3.5mm earphone socket, as long as 3.5mm earphone socket has plug access, the first interruption EINT_3.5 is just low level, on the 4th pin of 3.5mm earphone socket, move VDD (operating voltage of device inside) to, by a diode, export the second interrupt signal EINT_HEADSET3.5.Whether the second interrupt signal EINT_HEADSET3.5 as the EN that enables of control simulation switch 181, switches and the L channel MP3_IOL of two 3.5mm earphone sockets and 10pin earphone interface is connected with R channel MP3_IOR simultaneously.Before 3.5mm earphone does not insert, the second interrupt signal EINT_HEADSET3.5 is high level, thus analog switch 181 close, the left and right acoustic channels of 10pin earphone interface is not connected with the left and right acoustic channels of 3.5mm earphone.As long as 3.5mm earphone inserts, the second interrupt signal EINT_HEADSET3.5 is output as low level, thus analog switch 181 open, guarantee that the left and right acoustic channels of 3.5mm earphone is normal.Whether the 3rd interrupt signal EINT_HEADSET10 is for detection of being that 10pin earphone inserts.Enabling of analog switch is extremely important, and enabling EN is Low level effective.Under idle condition, the second interrupt signal EINT_HEADSET3.5 is high level, and analog switch cuts out.Only have when inserting 3.5mm earphone, the second interrupt signal EINT_HEADSET3.5 is low level, and now analog switch is opened.The signal that has guaranteed left and right acoustic channels can normally output to 3.5mm earphone.When CMMB antenna inserts, analog switch must cut out, thereby if guarantees that 10pin earphone interface has 10pin earphone to insert and also can normally use.

The priority of three interrupt signals must be established, and the first interrupt signal EINT_3.5 is limit priority, and the priority of the second interrupt signal EINT_HEADSET3.5 is greater than the priority of the 3rd interrupt signal EINT_HEADSET10.When interrupt signal being detected, must first detect the level of the first interrupt signal EINT_3.5, then detect the state of the second interrupt signal EINT_HEADSET3.5, finally detect the state of the 3rd interrupt signal EINT_HEADSET10.Cell phone system detects after interrupt signal, and whether first detect the first interrupt signal EINT_3.5 is low level, and low level, illustrates that 3.5mm earphone socket has joint to insert if.Low level if, continue to detect whether the second interrupt signal EINT_HEADSET3.5 is low level, if, can judge and insert 3.5mm earphone, continue to detect whether the 3rd interrupt signal EINT_HEADSET10 is low level, if so, insert 3.5mm earphone and 10pin earphone simultaneously, otherwise only inserted 3.5mm earphone; If the second interrupt signal EINT_HEADSET3.5 is high level, can be judged as CMMB antenna and insert, continue to detect whether the 3rd interrupt signal EINT_HEADSET10 is low level, thereby determine whether to have 10pin earphone to insert simultaneously.If EINT_3.5 is high level, continue to detect the 3rd interrupt signal EINT_HEADSET10, if the 3rd interrupt signal EINT_HEADSET10 is low level, can be judged as and only has 10pin earphone to insert.For mobile phone, no matter be that 10pin earphone inserts or 3.5mm earphone inserts, mobile phone is all operated in headset mode.

As shown in Figure 5, the recognition methods of shared interface device of the present invention comprises the following steps:

Step 101: produce interrupt signal after inserting 10pin earphone or 3.5mm earphone or CMMB antenna, such as needing only 3.5mm earphone, insert after 3.5mm earphone socket, the 6th pin 6 due to the first interrupt signal EINT_3.5 connection 3.5mm earphone socket, will produce low level first and interrupt EINT_3.5;

Step 102: interrupt signal detected by baseband processing chip;

Step 103: whether detect the first interrupt signal EINT_3.5 is low level, low level (being EINT_3.5=0) if, 3.5mm earphone socket has 3.5mm earphone or CMMB antenna to insert, and perform step 105, if the first interrupt signal EINT_3.5 is high level (being that EINT_3.5 is not equal to 0), perform step 104;

Step 104: continue to detect whether the 3rd interrupt signal EINT_HEADSET10 is low level, if low level (being EINT_HEADSET10=0), judge that 10pin earphone inserts 10pin earphone interface, if the 3rd interrupt signal EINT_HEADSET10 being detected is high level, turn back to step 102, continue to detect interrupt signal;

Step 105: if the first interrupt signal EINT_3.5 is low level, whether continue the second interrupt signal EINT_HEADSET3.5 is high level, if the second interrupt signal EINT_HEADSET3.5 is high level, perform step 106, now analog switch cuts out; If the second interrupt signal EINT_HEADSET3.5 is low level (EINT_HEADSET3.5=0), perform step 107, now analog switch is opened;

Step 106: continue to detect whether the 3rd interrupt signal EINT_HEADSET10 is low level, if low level (being EINT_HEADSET10=0) judges that CMMB antenna inserts 3.5mm earphone socket and 10pin earphone inserts 10pin earphone interface; If the 3rd interrupt signal EINT_HEADSET10 is high level, judge that CMMB antenna inserts 3.5mm earphone socket;

Step 107: continue to detect whether the 3rd interrupt signal EINT_HEADSET10 is low level, if low level (being EINT_HEADSET10=0) judges that 3.5mm earphone inserts 3.5mm earphone socket and 10pin earphone inserts 10pin earphone interface; If the 3rd interrupt signal EINT_HEADSET10 is high level, judge that 3.5mm earphone inserts 3.5mm earphone socket.

Therefore, by above method, can identify is to insert 10pin earphone or 3.5mm earphone or CMMB antenna, specifically as described in Table 2:

Table 2: the state table of five kinds of lower three interrupt signals of situation

Situation	Insert	The first interrupt signal EINT_3.5	The second interrupt signal EINT_HEADSET3.5	The 3rd interrupt signal EINT_HEADSET10
					1	10pi earphone	1 (high level)	1 (high level)	0 (low level)
2	3.5mm earphone	0	0	1
					3	CMMB antenna	0	1	1
4	CMMB antenna+10pi earphone	0	1	0
					5	3.5mm earphone+10pi earphone	0	0	0

Although more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, do not deviating under the prerequisite of principle of the present invention and essence, can make various changes or modifications to these execution modes.Therefore, protection scope of the present invention is limited by appended claims.

Claims

1. the shared interface device of a CMMB antenna and earphone, it is characterized in that, it comprises an analog switch, 3.5mm earphone socket and 10pin earphone interface, this 3.5mm earphone socket is for inserting 3.5mm earphone or CMMB antenna and being connected with the output of analog switch, this 10pin earphone interface is for inserting 10pin earphone and being connected with the input of analog switch, wherein CMMB antenna is divided into three sections, and the radius of second segment is 2.5mm;

The first interrupt signal connects the 6th pin of this 3.5mm earphone socket, and when this 3.5mm earphone socket has plug access, this first interrupt signal is low level; On the 4th pin of this 3.5mm earphone socket or the first pin, move VDD to, by a diode, export the second interrupt signal, only at this 3.5mm earphone socket, insert be this 3.5mm earphone time, this second interrupt signal is output as low level, thereby this analog switch is opened, the left and right acoustic channels of 10pin earphone interface is connected with the left and right acoustic channels of 3.5mm earphone, at this 3.5mm earphone socket, insert be this CMMB antenna time, this second interrupt signal is output as high level; Whether the 3rd interrupt signal has 10pin earphone to insert for detection of this 10pin earphone interface, and when the 3rd interrupt signal is low level, judges this 10pin earphone interface and insert 10pin earphone; Wherein the priority of this first interrupt signal is greater than the priority of this second interrupt signal, and the priority of this second interrupt signal is greater than the priority of the 3rd interrupt signal.

2. the shared interface device of CMMB antenna as claimed in claim 1 and earphone, is characterized in that, this 3.5mm earphone socket has six pins.

3. the shared interface device of CMMB antenna as claimed in claim 2 and earphone, it is characterized in that, on the 4th pin of this 3.5mm earphone socket, moving VDD and this CMMB antenna to inserts after this 3.5mm earphone socket, the first pin of this 3.5mm earphone socket, the second pin, the 3rd pin are unsettled, simultaneously the 4th pin of this 3.5mm earphone socket, the 5th pin, the equal ground connection of the 6th pin; On the first pin of this 3.5mm earphone socket, moving VDD and this CMMB antenna to inserts after this 3.5mm earphone socket, the 4th pin of this 3.5mm earphone socket, the second pin, the 3rd pin are unsettled, simultaneously the first pin of this 3.5mm earphone socket, the 5th pin, the equal ground connection of the 6th pin.

4. the shared interface device of CMMB antenna as claimed in claim 2 and earphone, is characterized in that, the first paragraph of this CMMB antenna be shaped as polygon, being shaped as of second segment and the 3rd section is cylindric.

5. the shared interface device of CMMB antenna as claimed in claim 2 and earphone, it is characterized in that, this 3.5mm earphone inserts after 3.5mm earphone socket, the first pin of this 3.5mm earphone socket is R channel, the second and the 3rd pin is unsettled, the 4th pin is L channel, and the 5th and the 6th pin is ground connection.

6. the recognition methods to the shared interface device of CMMB antenna as claimed in claim 1 and earphone, is characterized in that, it is identified and comprised the following steps by three interrupt signals:

S2: interrupt signal detected by a baseband processing chip;

S6: continue to detect whether the 3rd interrupt signal is low level, if low level judges that CMMB antenna inserts 3.5mm earphone socket and 10pin earphone inserts 10pin earphone interface; If the 3rd interrupt signal is high level, judge that CMMB antenna inserts 3.5mm earphone socket;

7. recognition methods as claimed in claim 6, is characterized in that, the priority of this first interrupt signal is greater than the priority of the second interrupt signal, and the priority of this second interrupt signal is greater than the priority of the 3rd interrupt signal.

8. recognition methods as claimed in claim 6, is characterized in that, when this second interrupt signal is low level, analog switch is opened; When this second interrupt signal is high level, analog switch cuts out.

9. recognition methods as claimed in claim 6, is characterized in that, when this second interrupt signal is low level, this 3.5mm earphone inserts 3.5mm earphone socket.