CN101465667A

CN101465667A - Method for obtaining corresponding optimum channel of mobile phone FM receiving station

Info

Publication number: CN101465667A
Application number: CNA2007101724462A
Authority: CN
Inventors: 晏春海
Original assignee: Shanghai Chenxing Electronics Science and Technology Co Ltd
Current assignee: Shanghai Chenxing Electronics Science and Technology Co Ltd
Priority date: 2007-12-18
Filing date: 2007-12-18
Publication date: 2009-06-24
Anticipated expiration: 2027-12-18
Also published as: CN101465667B

Abstract

Disclosed is a method for obtaining corresponding best channels for mobile phone FM radio receiver, including the steps that S1, the channel searching process, reached channels and corresponding received signal strength indication values (RSSI) are recorded; S2, when the channel searching is finished, and from the first channel, the prior channel is compared with the later channel according to the searched channels, and if the frequency interval between the prior channel and the later channel is 0.4MHz at most, the channel with low RSSI value is abandoned, and the channel with high RSSI value is maintained; if the frequency interval between the prior channel and the later channel is more than 0.4MHz, the prior channel is available, and the later channel is compared with the later adjacent channel; the operation continues until all the channels are compared. The invention can reliably overcome the repeated channel situation, obtain corresponding best channels for the mobile phone FM radio receiver and improve radio receiving quality.

Description

Obtain the method for corresponding optimum channel of the FM receiving platform of mobile phone

Technical field

The present invention relates to a kind of improvement method of mobile phone FM search receiving platform effect, specifically, is about eliminating the heavy platform way to solve the problem of automatic searching FM by handset based on the TLG1100 chip.

Background technology

Mobile phone not only has been confined to this basic function of conversing as a kind of communication tool, and science and technology is given multiple location such as its carry-on DV, digital camera, MP3.As the consumer of a fashion, fashion can become the target of chasing forever.Yet for most consumers, the FM function, the most practical beyond doubt, also function the most easily, need not additionally to carry huge fellow, also can enjoy the enjoyment of FM radio at any time, beautiful sensation is self-evident naturally, therefore, the FM function has become the key factor of considering when many consumers purchase machine.Listing based on the FM mobile phone of the TLG1100 chip of safe scape company, the tonequality of FM mobile phone is fine, but easily heavy platform when auto channel search (the corresponding platform of several channels of finding), such as FM105.7MHz is Shanghai traffic platform, might search out FM105.5MHz and FM105.9MHz when selecting search automatically, these three platforms are same in fact.Why can produce this phenomenon? this is because TLG1100 judges that certain effectively is according to RSSI when searching platform〉65 judge, these three frequency range RSSI values are all greater than 65, but the RSSI value of FM105.7MHz is maximum, this effect of RSSI value maximum is best, so these three platforms are exactly platform of FM105.7MHz, other two channels should not searched for out.In general, the interval between FM platform and the platform can be so not approaching, has the spacing of 0.4MHz at least.Subordinate list one is the channel list when searching platform, Fig. 1 is the operation principle flow chart that is easy to generate when weighing platform: when FM begins to search platform, his-and-hers watches one listed channel is got corresponding RSSI value (Received Signal Strength Indicator successively, the intensity indication of received signal), according to RSSI〉whether 65 these channels of this condition judgment effective, if RSSI〉65 items these channels are effective channels, otherwise be exactly invalid channel, so just be easy to generate above-mentioned three problems that channel all is a Shanghai traffic platform.

Summary of the invention

The objective of the invention is when overcoming FM automatic channel search of the prior art only with RSSI 65 as the problem of judging the effective defective of channel, solve the heavy platform of FM that exists in the prior art.

The method of the heavy platform problem of elimination FM of the present invention comprises step:

Platform that will search out when 1, searching platform and corresponding RSSI value are preserved;

2, searched for the platform that back basis searches, the adjacent stations comparison from first beginning and back (comprises 0.4Mhz) if the AM/BAM frequency is separated by in 0.4Mhz, give up to fall the little platform of RSSI value, keeps the big platform of RSSI value; Frequency is separated by, and then this platform is effective greater than 0.4Mhz, and the platform of getting adjacent with it the again back of the platform of back relatively; Relatively arrive so always all platforms all relatively intact till.

Adopt the method for the invention, compared with prior art, FM does not have again heavy platform phenomenon to produce, thereby, obtained the optimum channel of the FM receiving platform of mobile phone.

Description of drawings

Fig. 1 is the workflow diagram when producing FM weight platform problem;

Fig. 2 is a workflow diagram of eliminating the heavy platform problem of FM;

Fig. 3 is an algorithm flow chart of differentiating effective platform.

Embodiment

Provide one embodiment of the invention according to Fig. 1～Fig. 3 below, and described in detail,, rather than be used for limiting scope of the present invention so that those skilled in the art is easier to understand method feature of the present invention.

Please earlier referring to table one, it is the tabulation of TLG1100FM channel query, and is as follows:

Channel?number	Hz	Bandwidth(MHz)	Channel?standard
Channel?number	Hz	Bandwidth(MHz)	Channel?standard	201	87900000	6	TLG_VSTD_NTSC_M
202	88100000	6	TLG_VSTD_NTSC_M	201	87900000	6	TLG_VSTD_NTSC_M

203	88300000	6	TLG_VSTD_NTSC_M
203	88300000	6	TLG_VSTD_NTSC_M	204	88500000	6	TLG_VSTD_NTSC_M
205	88700000	6	TLG_VSTD_NTSC_M	204	88500000	6	TLG_VSTD_NTSC_M
205	88700000	6	TLG_VSTD_NTSC_M	206	88900000	6	TLG_VSTD_NTSC_M
207	89100000	6	TLG_VSTD_NTSC_M	206	88900000	6	TLG_VSTD_NTSC_M
207	89100000	6	TLG_VSTD_NTSC_M	208	89300000	6	TLG_VSTD_NTSC_M
209	89500000	6	TLG_VSTD_NTSC_M	208	89300000	6	TLG_VSTD_NTSC_M
209	89500000	6	TLG_VSTD_NTSC_M	210	89500000	6	TLG_VSTD_NTSC_M
…	…	…	…	210	89500000	6	TLG_VSTD_NTSC_M
…	…	…	…	298	107500000	6	TLG_VSTD_NTSC_M
299	107700000	6	TLG_VSTD_NTSC_M	298	107500000	6	TLG_VSTD_NTSC_M
299	107700000	6	TLG_VSTD_NTSC_M	300	107900000	6	TLG_VSTD_NTSC_M

From table one as seen the tabulation of table one TLG1100 FM channel query, is divided into four row in the table, first classifies channel as; Second classifies the frequency of channel correspondence as; The 3rd classifies the wavestrip width as, and unit is MHz; The 4th classifies the channel standard as, such as TV the NTSC/PAL standard is arranged, and FM is TSC-system formula standard without exception.Here when the search radio station, while search for reference to table one channel in the worldwide has all been listed, channel spacing is 0.2MHZ, cooperates with table one like this and searches the platform operation, just can not produce Lou platform phenomenon.

Fig. 1 is the workflow diagram when producing the heavy platform problem of FM, when beginning to search platform, gets the frequency of channel list successively and calculates corresponding RSSI value, judges RSSI value, RSSI〉65 items this be that effective platform is also preserved, will tabulate and search platform after relatively finishing and also just be through with.

Fig. 2 is a workflow diagram of eliminating the heavy platform problem of FM, when beginning to search platform, get the frequency of channel list successively and calculate corresponding RSSI value, judge the RSSI value, RSSI〉65 items these platforms and RSSI value all preserve, and searches platform after tabulation has been got and be through with, again the platform of preserving is differentiated, keep effective platform, Here it is differentiates effective platform algorithm.

Fig. 3 is an algorithm flow chart of differentiating effective platform:

A. from the platform of preserving, take out first and corresponding RSSI value;

B. inquiry has other not in the 0.4MHz interval;

C. be, their RSSI value relatively then, the big platform of reservation RSSI value, again with it as first, flow process turns back to b;

D. deny, then this is effective platform, and preservation is got off, and judges relatively to be over;

E. deny, take out next platform as first, program jumps to b;

F. be, differentiate that then effective platform finishes, what preserve all is effective platform.

After the algorithm process of differentiating effective platform, search for the just heavy platform of the platform that comes out automatically and occurred.

Summary is got up, and its operating procedure comprises when the first step is searched platform preserves RSSI〉65 platform and corresponding RSSI value, prepare against next step and judge which platform is effective;

Second step was exactly to differentiate effective platform algorithm: compare from the platform of first beginning and its back, the frequency interval that compares AM/BAM earlier, if frequency interval (comprises 0.4Mhz) in 0.4Mhz, give up the little platform of RSSI value, keep the big platform of RSSI value, with it as first again with the platform comparison of its back; Frequency is separated by, and then this is effective platform greater than 0.4Mhz, remains, the platform of getting its back as first again with the platform of its back relatively; Relatively go down all relatively is over up to all platforms so always, and the platform that remains is exactly effective platform.

In sum, the method of the heavy platform problem of the solution FM that the present invention proposes, be a kind of on the basis of the platform that TLG1100 (safe scape FM chip) search is come out, after the algorithm process of differentiating effective platform, eliminated the solution of heavy platform, make it to obtain the corresponding optimum channel of mobile phone FM receiving platform, reached the optimum efficiency in search radio station.

Claims

1, a kind of method of corresponding optimum channel of the FM receiving platform that obtains mobile phone is characterized in that, comprises step:

S ₁, when searching platform, the platform that searches out and corresponding received signal intensity indication (RSSI) value record are got off;

S ₂, searched for after, according to the platform that searches, from the platform of first beginning and its back relatively,, just give up to fall the little platform of received signal strength indicator value if adjacent AM/BAM frequency is separated by and is at most 0.4MHZ, keep the big platform of received signal strength indicator value; Frequency is separated by, and then this platform is effective greater than 0.4Mhz, and the platform of getting adjacent with it the again back of the platform of back relatively; Relatively arrive so always all platforms all relatively intact till.

2, the method for the corresponding optimum channel of the FM receiving platform that obtains mobile phone according to claim 1 is characterized in that, the described platform of searching ties up to whole FM wave band 87900000HZ～107900000HZ scope and carries out.

3, the method for the corresponding optimum channel of the FM receiving platform that obtains mobile phone according to claim 1 and 2 is characterized in that, when searching the platform operation simultaneously with reference to the tabulation of TLG1100FM channel query, in case the leak-stopping platform.