CN101917201A - Earphone circuit and method for processing FM frequency band signals received by earphone - Google Patents
Earphone circuit and method for processing FM frequency band signals received by earphone Download PDFInfo
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- CN101917201A CN101917201A CN2010102546036A CN201010254603A CN101917201A CN 101917201 A CN101917201 A CN 101917201A CN 2010102546036 A CN2010102546036 A CN 2010102546036A CN 201010254603 A CN201010254603 A CN 201010254603A CN 101917201 A CN101917201 A CN 101917201A
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Abstract
The invention belongs to the technical field of FM signal processing, and discloses an earphone circuit and a method for processing FM frequency band signals received by an earphone. The method comprises the following steps of: performing low impedance processing on an FM frequency band noise signal coupled to an audio signal through a first capacitor; continuing to perform attenuation processing on the FM frequency band noise signal through magnetic beads to make the energy of the FM frequency band noise signal further reduced; and coupling the FM frequency band signals of a left channel and a right channel of the earphone through a second capacitor to make the strength of the FM frequency band signals increased. The method can inhibit the FM frequency band noise signal in a listening end system from transmitting outwards and enhance the receiving strength of useful FM frequency band signals, thereby effectively improving FM receiving signal-to-noise ratio.
Description
Technical field
The invention belongs to FM signal processing technology field, be specifically related to the processing method of a kind of head circuit and reception FM frequency band signals thereof.
Background technology
Along with the continuous development of portable terminal technology, the requirement of user's mobile terminal function is also more and more higher.
Broadcast as example with the mobile phone reception, existing cell phone system generally with 26MHz as reference clock, obtain 104MHz or 208MHz isochronon clock frequency after the frequency multiplication as CPU frequency and memory, when therefore cell phone system moves, there are a large amount of 104MHz frequency energy in internal system, these energy can influence other modules in the system by conduction and radiation mode, are the main interference sources in the cell phone system.For example FM reception frequency range is 76.5MHz～108MHz, and 104MHz just in time drops in the FM frequency range.
For mobile phone with FM receiving function, usually utilize earphone cord as reception antenna, earphone signal is exported by baseband chip, be easy to the 104MHz frequency noise in the coupled system on the transmission path, when searching platform by earphone cord, the FM receiver can receive the 104MHz noise signal simultaneously, this noise signal strength may surpass the FM radio signals that receives, and it is submerged among the noise.
Prior art generally is by software masking 104MHz radio station, promptly allow the user search the radio station less than 104MHz, but this method is cured the symptoms, not the disease, because such as area, Hong Kong, 104MHz is an effective radio station, if the user need listen to this radio station, will disturb to influence because of system noise so and listen to.
How providing a kind of and can suppress to listen to the inner FM frequency range of end system noise signal and outwards conduct, can strengthen the head circuit of the receiving intensity of useful FM frequency band signals again, is one of direction of earphone technical field research.
Summary of the invention
The object of the present invention is to provide a kind of earphone to receive the processing method of FM frequency band signals, be intended to suppress to listen to the inner FM frequency range of end system noise signal and outwards conduct, strengthen the receiving intensity of useful FM frequency band signals.
The embodiment of the invention is achieved in that a kind of earphone receives the processing method of FM frequency band signals, said method comprising the steps of:
By first electric capacity FM frequency band noise signal that is coupled in the audio signal being carried out Low ESR handles;
Continue the FM frequency band noise signal is carried out attenuation processing by magnetic bead, make described FM frequency band noise signal energy further reduce;
By the FM frequency band signals of the described earphone left and right acoustic channels of second capacitive coupling, make described FM frequency band signals intensity increase.
Another purpose of the embodiment of the invention is to provide a kind of head circuit, and described circuit comprises:
First electric capacity, the FM frequency band noise signal that is used for that audio signal is coupled carry out Low ESR to be handled;
Magnetic bead is used for described FM frequency band noise signal is carried out attenuation processing, makes described FM frequency band noise signal energy further reduce; And
Second electric capacity, the FM frequency band signals of the described earphone left and right acoustic channels that is used to be coupled makes described FM frequency band signals intensity increase.
An also purpose of the embodiment of the invention is to provide a kind of portable terminal, and described terminal comprises the head circuit that the embodiment of the invention provides.
The embodiment of the invention is carried out the Low ESR processing by first electricity is set to the FM frequency band noise signal that is coupled in the audio signal in head circuit, the FM frequency band signals of the described earphone left and right acoustic channels of second capacitive coupling is set simultaneously, make described FM frequency band signals intensity increase, this head circuit can suppress to listen to the inner FM frequency range of end system noise signal and outwards conduct, strengthen the receiving intensity of useful FM frequency band signals again, therefore improved the FM received signal to noise ratio effectively.
Description of drawings
The structure chart of the head circuit that Fig. 1 provides for the embodiment of the invention;
The signal flow of the head circuit that Fig. 2 provides for the embodiment of the invention is to schematic diagram;
The earphone that Fig. 3 provides for the embodiment of the invention receives the flow chart of the processing method of FM frequency band signals.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 shows the structure chart of the head circuit that the embodiment of the invention provides.
Wherein, described circuit comprises first electric capacity, wherein, described first electric capacity is three electric capacity corresponding to the left and right sound channels of described baseband chip and microphone: first capacitor C 3, first capacitor C 4 and first capacitor C 5, described first capacitor C 3, first capacitor C 4, first capacitor C 5 are 330pf.
Described circuit also comprises second electric capacity, and described second electric capacity is two electric capacity corresponding to described earphone left and right sound channels: second capacitor C 1 and second capacitor C 2, described second capacitor C 1 and second capacitor C 2 are 1nf.
Described circuit also comprises a plurality of magnetic beads: magnetic bead BEAD1, magnetic bead BEAD2, magnetic bead BEAD3 and magnetic bead BEAD4, described magnetic bead is a plurality of magnetic beads of left and right sound channels, microphone and FM-ANT corresponding to described baseband chip, and described magnetic bead BEAD1, magnetic bead BEAD2, magnetic bead BEAD3 and magnetic bead BEAD4 are 600ohm@100MHz.
See also Fig. 2, the flow chart of the FM frequency band signals of the head circuit that Fig. 2 provides for the embodiment of the invention.
In specific implementation process, earphone left side from baseband chip output, the be coupled FM frequency band noise signal of system of R channel and microphone audio signal, such as 104MHz noise signal, when an earphone left side from baseband chip output, R channel and microphone audio signal are through first capacitor C 3 of 330pf, when first capacitor C 4 and first capacitor C 5, because first capacitor C 3 of 330pf, first capacitor C 4 and 5 pairs of 100MHz left and right sides of first capacitor C frequency band signals present Low ESR, therefore most of 104MHz noise signal will be through first capacitor C 3, first capacitor C 4 and first capacitor C, 5 inflow places, the path of 104MHz noise signal sees also the first lines path among Fig. 1 in this process;
Afterwards, magnetic bead BEAD1, magnetic bead BEAD2 and magnetic bead BEAD3 decay to the 104MHz noise signal the audio signal that spreads out of from baseband chip, make that 104MHz frequency range noise signal further reduces in the audio signal, the audio signal of importing earphone is become does not have 104MHz noise " totally " signal, sees also the second lines path;
At last, the earphone cord that is connected in earphone socket is from aerial coupling FM signal, second capacitor C 1 and second capacitor C 2 are corresponding to the left and right acoustic channels of earphone, earphone left and right acoustic channels FM frequency band signals further is coupled, the intensity of the FM signal that enters the FM receiver is further increased, see also three-way paths.
In sum, this mobile phone circuit had both suppressed the inner FM frequency range of cell phone system noise signal and had outwards conducted, strengthened the receiving intensity of useful FM frequency band signals again, therefore improved the FM received signal to noise ratio effectively, not only make the 104MHz radio station normally to listen to, need not software masking, and the reception in other radio station of FM frequency range is also had to a certain degree improvement.
The embodiment of the invention also provides a kind of portable terminal, and described portable terminal comprises the head circuit that the embodiment of the invention provides, in view of the operation principle of this head circuit in above existing detailed description, repeat no more herein.
The earphone that Fig. 3 shows the embodiment of the invention to be provided receives the flow process of the processing method of FM frequency band signals.
In step S301, by first electric capacity FM frequency band noise signal that is coupled in the audio signal is carried out Low ESR and handle;
Wherein, described first electric capacity is three electric capacity corresponding to described baseband chip left and right sound channels and microphone: first capacitor C 3, first capacitor C 4 and first capacitor C 5, described first capacitor C 1, first capacitor C 2 and first capacitor C 3 are 330pf.
In step S302, continue the FM frequency band noise signal is carried out attenuation processing by magnetic bead, make described FM frequency band noise signal energy further reduce;
Wherein, described magnetic bead is a plurality of magnetic beads of left and right sound channels, microphone and FM-ANT corresponding to described baseband chip, and described magnetic bead BEAD1, magnetic bead BEAD2, magnetic bead BEAD3 and magnetic bead BEAD4 are 600ohm@100MHz.
In step S303,, make described FM frequency band signals intensity increase by the FM frequency band signals of the described earphone left and right acoustic channels of second capacitive coupling.
Wherein, described second electric capacity is two electric capacity corresponding to described earphone left and right sound channels: second capacitor C 1 and second capacitor C 2, described second capacitor C 1 and second capacitor C 2 are 1nf.
Concrete process repeats no more in above existing detailed description herein.
The embodiment of the invention is carried out the Low ESR processing by first electricity is set to the FM frequency band noise signal that is coupled in the audio signal in head circuit, the FM frequency band signals of the described earphone left and right acoustic channels of second capacitive coupling is set simultaneously, make described FM frequency band signals intensity increase, this head circuit can suppress to listen to the inner FM frequency range of end system noise signal and outwards conduct, strengthen the receiving intensity of useful FM frequency band signals again, therefore improved the FM received signal to noise ratio effectively.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (9)
1. the processing method of an earphone reception FM frequency band signals is characterized in that, said method comprising the steps of:
By first electric capacity FM frequency band noise signal that is coupled in the audio signal being carried out Low ESR handles;
Continue the FM frequency band noise signal is carried out attenuation processing by magnetic bead, make described FM frequency band noise signal energy further reduce;
By the FM frequency band signals of the described earphone left and right acoustic channels of second capacitive coupling, make described FM frequency band signals intensity increase.
2. earphone as claimed in claim 1 receives the processing method of FM frequency band signals, it is characterized in that described first electric capacity is a plurality of electric capacity corresponding to described baseband chip left and right sound channels and microphone, and described first electric capacity is 330pf.
3. earphone as claimed in claim 1 receives the processing method of FM frequency band signals, it is characterized in that described second electric capacity is a plurality of electric capacity corresponding to described earphone left and right sound channels, and described second electric capacity is 1nf.
4. earphone as claimed in claim 1 receives the processing method of FM frequency band signals, it is characterized in that described magnetic bead is that described magnetic bead is 600ohm@100MHz corresponding to a plurality of magnetic beads of described baseband chip left and right sound channels, microphone and FM-ANT.
5. a head circuit is characterized in that, described circuit comprises:
First electric capacity, the FM frequency band noise signal that is used for that audio signal is coupled carry out Low ESR to be handled;
Magnetic bead is used for described FM frequency band noise signal is carried out attenuation processing, makes described FM frequency band noise signal energy further reduce; And
Second electric capacity, the FM frequency band signals of the described earphone left and right acoustic channels that is used to be coupled makes described FM frequency band signals intensity increase.
6. head circuit as claimed in claim 5 is characterized in that, described first electric capacity is that described first electric capacity is 330pf corresponding to the left and right sound channels of described baseband chip and a plurality of electric capacity of microphone.
7. head circuit as claimed in claim 5 is characterized in that, described second electric capacity is a plurality of electric capacity corresponding to described earphone left and right sound channels, and described second electric capacity is 1nf.
8. head circuit as claimed in claim 5 is characterized in that, described magnetic bead is a plurality of magnetic beads of left and right sound channels, microphone and FM-ANT corresponding to described baseband chip, and described magnetic bead is 600ohm@100MHz.
9. a portable terminal is characterized in that, described terminal comprises each described head circuit of claim 5 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010254603.6A CN101917201B (en) | 2010-08-12 | 2010-08-12 | Earphone circuit and method for processing FM frequency band signals received by earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010254603.6A CN101917201B (en) | 2010-08-12 | 2010-08-12 | Earphone circuit and method for processing FM frequency band signals received by earphone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101917201A true CN101917201A (en) | 2010-12-15 |
| CN101917201B CN101917201B (en) | 2014-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010254603.6A Expired - Fee Related CN101917201B (en) | 2010-08-12 | 2010-08-12 | Earphone circuit and method for processing FM frequency band signals received by earphone |
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| CN (1) | CN101917201B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012152100A1 (en) * | 2011-08-18 | 2012-11-15 | 中兴通讯股份有限公司 | Handset device, handset, and method for processing signal by using handset device |
| CN104683903A (en) * | 2015-02-10 | 2015-06-03 | 小米科技有限责任公司 | Earphone control method and device |
| WO2018166271A1 (en) * | 2017-03-17 | 2018-09-20 | 中兴通讯股份有限公司 | Fm earphone jack circuit, audio terminal and control method therefor |
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| CN2041476U (en) * | 1988-05-06 | 1989-07-19 | 朱培永 | Imitating stereophony adapter |
| CN2465399Y (en) * | 2001-02-16 | 2001-12-12 | 樊明延 | Portable multi-function radio receiver |
| CN1438812A (en) * | 2002-02-15 | 2003-08-27 | 株式会社上一情报通信 | Earphone sound out-put circuit with radio function |
| CN201252633Y (en) * | 2008-07-10 | 2009-06-03 | 比亚迪股份有限公司 | Ear piece |
| CN201444651U (en) * | 2009-07-31 | 2010-04-28 | 沈阳晨讯希姆通科技有限公司 | Dual-headphone adapter and corresponding main board thereof |
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2010
- 2010-08-12 CN CN201010254603.6A patent/CN101917201B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2041476U (en) * | 1988-05-06 | 1989-07-19 | 朱培永 | Imitating stereophony adapter |
| CN2465399Y (en) * | 2001-02-16 | 2001-12-12 | 樊明延 | Portable multi-function radio receiver |
| CN1438812A (en) * | 2002-02-15 | 2003-08-27 | 株式会社上一情报通信 | Earphone sound out-put circuit with radio function |
| CN201252633Y (en) * | 2008-07-10 | 2009-06-03 | 比亚迪股份有限公司 | Ear piece |
| CN201444651U (en) * | 2009-07-31 | 2010-04-28 | 沈阳晨讯希姆通科技有限公司 | Dual-headphone adapter and corresponding main board thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012152100A1 (en) * | 2011-08-18 | 2012-11-15 | 中兴通讯股份有限公司 | Handset device, handset, and method for processing signal by using handset device |
| CN102957980B (en) * | 2011-08-18 | 2017-08-11 | 中兴通讯股份有限公司 | Headphone device, earphone and the method using Headphone device process signal |
| CN107277665A (en) * | 2011-08-18 | 2017-10-20 | 中兴通讯股份有限公司 | Headphone device, earphone and the method using Headphone device process signal |
| CN104683903A (en) * | 2015-02-10 | 2015-06-03 | 小米科技有限责任公司 | Earphone control method and device |
| WO2018166271A1 (en) * | 2017-03-17 | 2018-09-20 | 中兴通讯股份有限公司 | Fm earphone jack circuit, audio terminal and control method therefor |
| CN108632696A (en) * | 2017-03-17 | 2018-10-09 | 中兴通讯股份有限公司 | A kind of FM earphone bases circuit, voice frequency terminal and its control method |
| CN108632696B (en) * | 2017-03-17 | 2021-01-26 | 中兴通讯股份有限公司 | FM earphone seat circuit, audio terminal and control method thereof |
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| Publication number | Publication date |
|---|---|
| CN101917201B (en) | 2014-01-22 |
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Granted publication date: 20140122 |