CN101262237A - FM circuit for handheld mobile device - Google Patents
FM circuit for handheld mobile device Download PDFInfo
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- CN101262237A CN101262237A CNA2008100892592A CN200810089259A CN101262237A CN 101262237 A CN101262237 A CN 101262237A CN A2008100892592 A CNA2008100892592 A CN A2008100892592A CN 200810089259 A CN200810089259 A CN 200810089259A CN 101262237 A CN101262237 A CN 101262237A
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- circuit
- baseband chip
- audio signal
- mobile device
- chip
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Abstract
The invention discloses a frequency modulation circuit of a handheld mobile device. The frequency modulation circuit of the handheld mobile device comprises a modulation circuit and a baseband chip, wherein, an input end of the baseband chip is provided with a microphone access, and the modulation circuit can realize modulation function by the controlling of the baseband chip; the modulation circuit of the handheld mobile device further comprises a matching circuit, and the matching circuit receives the modulation frequency audio signals output by the modulation circuit, is used for adjusting the parameters of the modulation frequency audio signals, leads the modulation frequency audio signals to meet the requirements of the microphone access, and sends the adjusted modulation frequency audio signals to the baseband chip. The technical proposal adopted by the invention can lead the baseband chip to take part in the processing of the audio signals, overcomes the defects of the existing FM circuit, and extends the terminal functions.
Description
Technical field
The present invention relates to a kind of mobile phone technology, specifically, relate to a kind of FM circuit of handheld mobile device.
Background technology
Integrated have great convenience for the user of frequency modulation (FM) function on portable terminal had considerable mobile phone to possess the FM function on the market.Present FM circuit generally adopts the FM chip to produce the FM audio signal, outputs to audio output apparatus (as loud speaker, earphone etc.) after audio frequency power amplifier amplifies.
The patent application of China application number CN200520066536 discloses a kind of mobile phone of built-in mini radio reception module, comprise phone housing and the mobile phone main circuit board that is positioned at phone housing, described mobile phone main circuit board is provided with baseband chip, also be provided with the radio reception module on the described mobile phone main circuit board, described radio reception module comprises FM chip and audio power amplifier circuit, described FM chip links to each other with baseband chip, and the input of audio power amplifier circuit links to each other with the FM chip, and output is used for linking to each other with audio output circuit.
Existing terminal can only realize that simple FM listens to and playing function, can not record the FM voice.Though baseband chip is arranged, audio signal can only be given special-purpose acoustic processing chip and be handled, and can not be delivered on the baseband chip, thereby limit the function of mobile phone.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of FM circuit of handheld mobile device, makes baseband chip can participate in the processing of audio signal.
Technical scheme is as follows:
A kind of FM circuit of handheld mobile device comprises FM circuit and baseband chip, and the input of described baseband chip is provided with Mike's path, and described FM circuit realizes frequency modulation function by the control of described baseband chip; Also comprise match circuit, described match circuit receives the frequency modulated audio signal of described FM circuit output, be used to adjust the parameter of described frequency modulated audio signal, make described frequency modulated audio signal meet the requirement of described Mike's path, and adjusted frequency modulated audio signal is sent to described baseband chip.
Preferably, described baseband chip is connected with audio output apparatus, and described baseband chip sends to described audio output apparatus with described frequency modulated audio signal, and the described frequency modulated audio signal that described audio output apparatus is used for receiving is converted to voice signal.
Preferably, described baseband chip is used to preserve the described frequency modulated audio signal that receives.
Preferably, Mike's path of described baseband chip is provided with analog switch, is connected with Mike and described match circuit on Mike's path of described analog switch input, and the output of described analog switch is connected with described baseband chip; Described analog switch is used to select to insert the frequency modulated audio signal of described match circuit or Mike's audio signal of described Mike arrives described baseband chip.
Preferably, described Mike's path is monophony or stereo path.
Preferably, described FM circuit is the frequency modulation chip.
Preferably, the parameter adjustment of the frequency modulated audio signal that the described frequency modulation chip of described match circuit is sent and enters into described baseband chip by described Mike's path within the scope of the permission of described baseband chip.
Preferably, described match circuit is used to adjust the amplitude of described frequency modulated audio signal, makes Mike that described frequency modulated audio signal is fit to described baseband chip all; Simultaneously, described match circuit is used for described frequency modulated audio signal is changed to differential signal.
Preferably, described frequency modulation chip and baseband chip are provided with bidirectional bus I2C interface, and described frequency modulation chip is connected by described I2C interface with baseband chip, and described baseband chip is controlled described frequency modulation chip by described I2C interface.
Preferably, described audio output apparatus is loud speaker, receiver or earphone receiver.
FM circuit provided by the invention has overcome the defective of existing FM circuit by the baseband chip audio signal, has expanded termination function.Can either realize recording, can utilize communication channel that audio signal is sent to partner again, and for realizing that more function provides hardware foundation.
Description of drawings
Fig. 1 is the structured flowchart of the FM circuit of handheld mobile device among the present invention.
Embodiment
The core of the FM circuit that the present invention proposes is to utilize Mike (MIC) path to realize that the FM audio signal is input to baseband chip, thereby realizes sound-recording function.The MIC audio signal that MIC delivers to the MIC path is identical with the FM audio signal character that the FM chip is sent, and all is the FM audio signal, so can be used as the input of baseband chip.The input of baseband chip realizes by the MIC path, the FM audio signal of considering the output of FM chip does not sometimes match with the FM audio signal that baseband chip needs, the present invention increases a match circuit, the parameter adjustment of the FM audio signal of the FM chip being sent by this match circuit and enters into baseband chip by the MIC path within the scope of the permission of baseband chip.Match circuit is adjusted the amplitude of FM audio signal on the one hand, makes it to be fit to baseband chip MIC all; On the other hand, the MIC path of base band generally requires the difference input, and the general output of FM chip is stereo, so need match circuit that the FM audio signal is changed to differential signal.Baseband chip often has the function of recording the FM audio signal, has so just realized recording the FM voice functions.Can handle the FM audio signal of FM chip by baseband chip simultaneously, realize more function, send FM voice etc. to the other side during as conversation.
With reference to the accompanying drawings, the preferred embodiments of the present invention are elaborated.
As shown in Figure 1, be the structured flowchart of the FM circuit of handheld mobile device, mainly comprise following a few part:
After handheld mobile device was opened the FM function, the radio station signal that FM chip 102 receives from FM antenna 101 was sent the FM audio signal to match circuit 103 after decoding.This FM audio signal can be one (monophony) or two (stereo) according to the difference of FM chip 102 types, adjusts to the input range that the MIC path of baseband chip 106 requires through match circuit 103.Adjusted FM audio signal and MIC audio signal are delivered to the MIC path input of baseband chip 106 jointly as the input of analog switch 105 after analog switch 105 is selected.Enter baseband chip 106 if analog switch 105 switches the FM audio signal, then the FM audio signal is admitted to baseband chip 106.Analog switch 105 switches to respective via by software control in the different operation of handheld mobile device.General baseband chip 106 all has the function of recording MIC path audio signal, so the FM audio signal inserts MIC path input and has also just given the ability that baseband chip 106 is recorded the FM audio signal, can make handheld mobile device have the audio frequency way of output more flexibly by software control FM audio signal output to audio output apparatus (as loud speaker, earphone etc.).Can also in baseband chip 106, handle, make the FM audio signal send to the correspondent user, for example, can in communication process, play the FM audio signal of recording to partner by baseband chip 106 to the FM audio signal.
Claims (10)
1, a kind of FM circuit of handheld mobile device comprises FM circuit and baseband chip, and the input of described baseband chip is provided with Mike's path, it is characterized in that: described FM circuit realizes frequency modulation function by the control of described baseband chip; Also comprise match circuit, described match circuit receives the frequency modulated audio signal of described FM circuit output, be used to adjust the parameter of described frequency modulated audio signal, make described frequency modulated audio signal meet the requirement of described Mike's path, and adjusted frequency modulated audio signal is sent to described baseband chip.
2, the FM circuit of handheld mobile device as claimed in claim 1, it is characterized in that: described baseband chip is connected with audio output apparatus, described baseband chip sends to described audio output apparatus with described frequency modulated audio signal, and the described frequency modulated audio signal that described audio output apparatus is used for receiving is converted to voice signal.
3, the FM circuit of handheld mobile device as claimed in claim 1 is characterized in that: described baseband chip is used to preserve the described frequency modulated audio signal that receives.
4, the FM circuit of handheld mobile device as claimed in claim 1, it is characterized in that: Mike's path of described baseband chip is provided with analog switch, be connected with Mike and described match circuit on Mike's path of described analog switch input, the output of described analog switch is connected with described baseband chip; Described analog switch is used to select to insert the frequency modulated audio signal of described match circuit or Mike's audio signal of described Mike arrives described baseband chip.
5, the FM circuit of handheld mobile device as claimed in claim 1 is characterized in that: described Mike's path is monophony or stereo path.
6, the FM circuit of handheld mobile device as claimed in claim 1 is characterized in that: described FM circuit is the frequency modulation chip.
7, the FM circuit of handheld mobile device as claimed in claim 6, it is characterized in that: the parameter adjustment of the frequency modulated audio signal that the described frequency modulation chip of described match circuit is sent and enters into described baseband chip by described Mike's path within the scope of the permission of described baseband chip.
8, the FM circuit of handheld mobile device as claimed in claim 7 is characterized in that: described match circuit is used to adjust the amplitude of described frequency modulated audio signal, makes Mike that described frequency modulated audio signal is fit to described baseband chip all; Simultaneously, described match circuit is used for described frequency modulated audio signal is changed to differential signal.
9, the FM circuit of handheld mobile device as claimed in claim 6, it is characterized in that: described frequency modulation chip and baseband chip are provided with bidirectional bus I2C interface, described frequency modulation chip is connected by described I2C interface with baseband chip, and described baseband chip is controlled described frequency modulation chip by described I2C interface.
10, the FM circuit of handheld mobile device as claimed in claim 2 is characterized in that: described audio output apparatus is loud speaker, receiver or earphone receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100892592A CN101262237B (en) | 2008-04-25 | 2008-04-25 | FM device for handheld mobile device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100892592A CN101262237B (en) | 2008-04-25 | 2008-04-25 | FM device for handheld mobile device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101262237A true CN101262237A (en) | 2008-09-10 |
| CN101262237B CN101262237B (en) | 2012-02-08 |
Family
ID=39962493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100892592A Expired - Fee Related CN101262237B (en) | 2008-04-25 | 2008-04-25 | FM device for handheld mobile device |
Country Status (1)
| Country | Link |
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| CN (1) | CN101262237B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510914A (en) * | 2009-03-09 | 2009-08-19 | 上海闻泰电子科技有限公司 | Method for controlling mobile terminal FM module through pluggable earphone |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3349688B2 (en) * | 1999-11-05 | 2002-11-25 | 松下電器産業株式会社 | Mobile communication terminal |
| KR20060122107A (en) * | 2005-05-25 | 2006-11-30 | 엘지전자 주식회사 | Mobile communication terminal with frequency modulation and its operating method |
| CN200987158Y (en) * | 2006-08-17 | 2007-12-05 | 德信无线通讯科技（北京）有限公司 | Mobile phone with radio function |
| CN101022279A (en) * | 2007-03-16 | 2007-08-22 | 华为技术有限公司 | Frequency modulation/amplitude modulation transmitting mobile terminal, method and system for receiving frequency modulation transmission |
-
2008
- 2008-04-25 CN CN2008100892592A patent/CN101262237B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510914A (en) * | 2009-03-09 | 2009-08-19 | 上海闻泰电子科技有限公司 | Method for controlling mobile terminal FM module through pluggable earphone |
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| Publication number | Publication date |
|---|---|
| CN101262237B (en) | 2012-02-08 |
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Granted publication date: 20120208 Termination date: 20180425 |