CN101917201B - 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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- CN101917201B CN101917201B CN201010254603.6A CN201010254603A CN101917201B CN 101917201 B CN101917201 B CN 101917201B CN 201010254603 A CN201010254603 A CN 201010254603A CN 101917201 B CN101917201 B CN 101917201B
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- frequency band
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- band signals
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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 development of mobile terminal technology, the requirement of user's mobile terminal function is also more and more higher.
With mobile phone, receive and broadcast as example, existing cell phone system is generally usingd 26MHz as reference clock, after frequency multiplication, obtain 104MHz or 208MHz isochronon as the clock frequency of 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 affect other modules in system by conduction and radiation mode, are the main interference sources in cell phone system.For example FM reception frequency range is 76.5MHz～108MHz, and 104MHz just in time drops in FM frequency range.
For the mobile phone with FM receiving function, conventionally utilize earphone cord as reception antenna, earphone signal is exported by baseband chip, on transmission path, be easy to the 104MHz frequency noise in coupled system, FM receiver can receive 104MHz noise signal during by earphone cord tuning simultaneously, this noise signal strength may surpass the FM radio signals receiving, and it is submerged among noise.
Prior art is generally by software masking 104MHz radio station, allow user search the radio station less than 104MHz, but this method is cured the symptoms, not the disease, because such as Hongkong, 104MHz is an effective radio station, if user need to listen to this radio station, will disturb to affect because of system noise so and listen to.
How providing a kind of earphone internal system FM frequency range noise signal that can suppress outwards to conduct, can strengthen again the head circuit of the receiving intensity of useful FM frequency band signals, 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 earphone internal system FM frequency range noise signal and outwards conduct, strengthen the receiving intensity of useful FM frequency band signals.
The embodiment of the present 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 the first electric capacity, the FM frequency band noise signal being coupled in audio signal is carried out to Low ESR processing;
By magnetic bead, continue FM frequency band noise signal to carry out attenuation processing, described FM frequency band noise signal energy is further reduced;
By the FM frequency band signals of earphone left and right acoustic channels described in the second capacitive coupling, make described FM frequency band signals strength increase.
Another object of the embodiment of the present invention is to provide a kind of head circuit, and described circuit comprises:
The first electric capacity, carries out Low ESR processing for the FM frequency band noise signal that audio signal is coupled;
Magnetic bead, for described FM frequency band noise signal is carried out to attenuation processing, further reduces described FM frequency band noise signal energy; And
The second electric capacity, for the FM frequency band signals of the described earphone left and right acoustic channels that is coupled, makes described FM frequency band signals strength increase.
An also object of the embodiment of the present invention is to provide a kind of mobile terminal, and described terminal comprises the head circuit that the embodiment of the present invention provides.
The embodiment of the present invention is carried out Low ESR processing by the first electricity is set in head circuit to the FM frequency band noise signal being coupled in audio signal, the FM frequency band signals of earphone left and right acoustic channels described in the second capacitive coupling is set simultaneously, make described FM frequency band signals strength increase, this head circuit can suppress earphone internal system FM frequency range noise signal and outwards conduct, strengthen again the receiving intensity of useful FM frequency band signals, therefore effectively improved FM received signal to noise ratio.
Accompanying drawing explanation
The structure chart of the head circuit that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 flows to schematic diagram for the signal of the head circuit that the embodiment of the present invention provides;
The earphone that Fig. 3 provides for the embodiment of the present invention receives the flow chart of the processing method of FM frequency band signals.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the structure chart of the head circuit that the embodiment of the present invention provides.
Wherein, described circuit comprises the first electric capacity, wherein, the first described electric capacity is three electric capacity corresponding to the left and right sound channels of described baseband chip and microphone: the first capacitor C 3, the first capacitor C 4 and the first capacitor C 5, described the first capacitor C 3, the first capacitor C 4, the first capacitor C 5 are 330pf.
Described circuit also comprises the second electric capacity, and described the second electric capacity is two electric capacity corresponding to described earphone left and right sound channels: the second capacitor C 1 and the second capacitor C 2, described the second capacitor C 1 and the 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 600ohm100MHz.
Refer to Fig. 2, the flow chart of the FM frequency band signals of the head circuit that Fig. 2 provides for the embodiment of the present invention.
In specific implementation process, left from the earphone of 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 left from the earphone of baseband chip output, R channel and microphone audio signal are through the first capacitor C 3 of 330pf, when the first capacitor C 4 and the first capacitor C 5, because the first capacitor C 3 of 330pf, 5 pairs of 100MHz left and right frequency band signals of the first capacitor C 4 and the first capacitor C present Low ESR, therefore most of 104MHz noise signal will be through the first capacitor C 3, the first capacitor C 4 and the first capacitor C 5 inflow places, in this process, the path of 104MHz noise signal refers to the First Line paths in Fig. 1,
Afterwards, magnetic bead BEAD1, magnetic bead BEAD2 and magnetic bead BEAD3 decay to the 104MHz noise signal the audio signal spreading out of from baseband chip, 104MHz frequency range noise signal in audio signal is further reduced, the audio signal that makes to input earphone becomes does not have 104MHz noise " totally " signal, refers to the second lines path;
Finally, be connected in the earphone cord of earphone socket from aerial coupling FM signal, the second capacitor C 1 and the 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 is further coupled, the intensity that makes to enter the FM signal of FM receiver further increases, and refers to the 3rd lines path.
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 again the receiving intensity of useful FM frequency band signals, therefore effectively improved FM received signal to noise ratio, not only make 104MHz radio station normally to listen to, without software masking, and the reception in other radio station of FM frequency range is also had to improvement to a certain degree.
The embodiment of the present invention also provides a kind of mobile terminal, and described mobile terminal comprises the head circuit that the embodiment of the present invention provides, and in view of the operation principle of this head circuit is described later in detail above, repeats no more herein.
The earphone that Fig. 3 shows the embodiment of the present invention to be provided receives the flow process of the processing method of FM frequency band signals.
In step S301, by the first electric capacity, the FM frequency band noise signal being coupled in audio signal is carried out to Low ESR processing;
Wherein, the first described electric capacity is three electric capacity corresponding to described baseband chip left and right sound channels and microphone: the first capacitor C 3, the first capacitor C 4 and the first capacitor C 5, described the first capacitor C 1, the first capacitor C 2 and the first capacitor C 3 are 330pf.
In step S302, by magnetic bead, continue FM frequency band noise signal to carry out attenuation processing, described FM frequency band noise signal energy is further reduced;
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 600ohm100MHz.
In step S303, by the FM frequency band signals of earphone left and right acoustic channels described in the second capacitive coupling, make described FM frequency band signals strength increase.
Wherein, described the second electric capacity is two electric capacity corresponding to described earphone left and right sound channels: the second capacitor C 1 and the second capacitor C 2, described the second capacitor C 1 and the second capacitor C 2 are 1nf.
Concrete process is described later in detail above, repeats no more herein.
The embodiment of the present invention is carried out Low ESR processing by the first electricity is set in head circuit to the FM frequency band noise signal being coupled in audio signal, the FM frequency band signals of earphone left and right acoustic channels described in the second capacitive coupling is set simultaneously, make described FM frequency band signals strength increase, this head circuit can suppress earphone internal system FM frequency range noise signal and outwards conduct, strengthen again the receiving intensity of useful FM frequency band signals, therefore effectively improved FM received signal to noise ratio.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (3)
1. earphone receives a processing method for FM frequency band signals, it is characterized in that, said method comprising the steps of:
By the first electric capacity, the FM frequency band noise signal being coupled in audio signal is carried out to Low ESR processing;
By magnetic bead, continue FM frequency band noise signal to carry out attenuation processing, described FM frequency band noise signal energy is further reduced;
By the FM frequency band signals of earphone left and right acoustic channels described in the second capacitive coupling, make described FM frequency band signals strength increase;
Described method is carried out Low ESR processing by the first electric capacity is set in head circuit to the FM frequency band noise signal being coupled in audio signal, the FM frequency band signals that earphone left and right acoustic channels described in the second capacitive coupling is set simultaneously, makes described FM frequency band signals strength increase; Described method makes head circuit can suppress earphone internal system FM frequency range noise signal outwards to conduct, strengthened again the receiving intensity of FM frequency band signals, improved FM received signal to noise ratio;
Described the first electric capacity is a plurality of electric capacity corresponding to described baseband chip left and right sound channels and microphone, and described the first electric capacity is 330pf;
Described the second electric capacity is a plurality of electric capacity corresponding to described earphone left and right sound channels, and described the second electric capacity is 1nf;
Described magnetic bead is that described magnetic bead is 600ohm100MHz corresponding to a plurality of magnetic beads of described baseband chip left and right sound channels, microphone and FM-ANT;
The first electric capacity of 330pf presents Low ESR to 100MHz left and right frequency band signals, makes most of 104MHz noise signal will be through the first electric capacity inflow place;
Described magnetic bead is decayed to the 104MHz noise signal the audio signal spreading out of from baseband chip, and 104MHz frequency range noise signal in audio signal is further reduced.
2. a head circuit, is characterized in that, described circuit comprises:
The first electric capacity, carries out Low ESR processing for the FM frequency band noise signal that audio signal is coupled;
Magnetic bead, for described FM frequency band noise signal is carried out to attenuation processing, further reduces described FM frequency band noise signal energy; And
The second electric capacity, for the FM frequency band signals of the described earphone left and right acoustic channels that is coupled, makes described FM frequency band signals strength increase;
Described head circuit carries out Low ESR processing by the first electric capacity to the FM frequency band noise signal being coupled in audio signal, by the FM frequency band signals of earphone left and right acoustic channels described in the second capacitive coupling, makes described FM frequency band signals strength increase; Described head circuit can suppress earphone internal system FM frequency range noise signal and outwards conduct, and has strengthened again the receiving intensity of FM frequency band signals, has improved FM received signal to noise ratio;
Described the first electric capacity is that described the 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;
Described the second electric capacity is a plurality of electric capacity corresponding to described earphone left and right sound channels, and described the second electric capacity is 1nf;
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 600ohm100MHz;
The first electric capacity of 330pf presents Low ESR to 100MHz left and right frequency band signals, makes most of 104MHz noise signal will be through the first electric capacity inflow place;
Described magnetic bead is decayed to the 104MHz noise signal the audio signal spreading out of from baseband chip, and 104MHz frequency range noise signal in audio signal is further reduced.
3. a mobile terminal, is characterized in that, described terminal comprises head circuit claimed in claim 2.
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 CN101917201A (en) | 2010-12-15 |
| CN101917201B true 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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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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 |
-
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 |
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| CN101917201A (en) | 2010-12-15 |
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