CN106358122A - Method and system for converting signals of left and right sound tracks of earphone into dual-loudspeaker signals - Google Patents
Method and system for converting signals of left and right sound tracks of earphone into dual-loudspeaker signals Download PDFInfo
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- CN106358122A CN106358122A CN201611020490.7A CN201611020490A CN106358122A CN 106358122 A CN106358122 A CN 106358122A CN 201611020490 A CN201611020490 A CN 201611020490A CN 106358122 A CN106358122 A CN 106358122A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a method and system for converting signals of left and right sound tracks of an earphone into dual-loudspeaker signals. An output signal of a loudspeaker signal output pin of an audio processing chip is suspended. The method comprises the following steps: (1) respectively outputting the signals of the left and right sound tracks output by the audio processing chip to a first RC high-pass filter and a second RC high-pass filter; (2) respectively outputting the filtered signals of the left and right sound tracks to left and right voice amplification chips for amplification; and (3) respectively outputting the amplified signals of the left and right sound tracks to a first loudspeaker and a second loudspeaker. According to the method, the playing of the two loudspeakers can be supported and realized by only utilizing the audio processing chip which is low in cost and only supports single-loudspeaker audio signal outputting, the development requirement can be met, the dual-loudspeaker stereo outputting effect is achieved, and meanwhile, the normal use of earphone functions is guaranteed.
Description
Technical field
The present invention relates to audio signal field.It is more particularly related to a kind of utilize earphone left and right sound track signals
It is converted into the method and system of twin loudspeaker signal.
Background technology
Smart electronicses terminal electronic device, in order to improve the audio frequency effect of product, designs two speakers on an electronic device
Become main flow, it can be made to play formation stereophonic effect during audio frequency.But most audio processing chips are only supported in the market
Single loudspeaker audio signal output, minority can support that the audio processing chip of twin loudspeaker audio signal output is expensive,
Hinder the long term growth of electronic equipment, therefore should quickly solve the above problems.
Content of the invention
It is an object of the invention to solution at least the above, and provide the advantage that at least will be described later.
It is a still further object of the present invention to provide a kind of be converted into twin loudspeaker signal using earphone left and right sound track signals
Method and system, the audio processing chip that developer only need to be exported using the cheap single loudspeaker audio signal of only support,
Can achieve and make it support that twin loudspeaker is play, reach twin loudspeaker and play stereophonic effect, adapt to the development of electronic equipment.
In order to realize according to object of the present invention and further advantage, there is provided one kind utilizes earphone left and right sound track signals
The method being converted into twin loudspeaker signal, comprises the following steps:
Step one, the earphone left and right sound channels signal exporting audio processing chip export respectively to a rc high-pass filtering
Device and the 2nd rc high pass filter；
Step 2, will be filtered after earphone left and right sound channels signal export respectively and put to left and right audio frequency amplification chip
Big process；
Step 3, the earphone left and right sound channels signal after processing and amplifying is exported respectively and raises one's voice to the first speaker and second
Device.
Preferably, described audio processing chip is before output earphone left and right sound channels signal, further comprising the steps of:
Whether central processing unit detection electronic equipment has audio signal to export, and when audio signal output is detected, it continues
The headset plugging detection signal of continuous test earphone adapter output,
When earphone insertion is detected, central processing unit produces low level and enables signal and be delivered to left and right audio frequency amplification
Chip, makes the enable signal of left and right audio frequency amplification chip remain low level, left and right audio frequency amplification chip does not work, and earphone is made
For loading exports audio signal；
When detecting, the earless machine transplanting of rice is fashionable, and central processing unit produces high level and enables signal and be delivered to left and right audio frequency and put
Large chip, makes the enable signal of left and right audio frequency amplification chip remain high level, left and right audio frequency amplification chip work, and first raises
Sound device and the second speaker are as load exports audio signal.
Preferably, described audio processing chip only supports one group of loudspeaker signal output, does not support multigroup speaker letter
Number output.
Preferably, a rc high pass filter and the 2nd rc high pass filter are disposed as filtering the sound of below 217hz
Frequency signal.
The present invention also provides a kind of system being converted into twin loudspeaker signal using earphone left and right sound track signals, wherein, sound
Frequency process chip list loudspeaker signal output pin is disconnected with the connection of single speaker pin, it include audio processing chip and in
Central processor is it is characterised in that also include:
First rc high pass filter and the 2nd rc high pass filter, the earphone left and right sound channels letter of described audio processing chip
Number output pin is connected with a rc high pass filter and the 2nd rc high pass filter respectively；
Left and right audio frequency amplification chip, it is connected with a rc high pass filter and the 2nd rc high pass filter respectively；With
And,
First speaker and the second speaker, it is connected with left and right audio frequency amplification chip respectively.
Preferably, a described rc high pass filter and the 2nd rc high pass filter are disposed as filtering below 217hz
Audio signal；
First rc high pass filter includes: the first electric capacity and first resistor, and the second electric capacity and second resistance；
Wherein headset left channel signal sends into left audio frequency amplification chip signal after sequentially passing through the first electric capacity and first resistor
Input pin positive pole, the first electric capacity, first resistor and left audio frequency amplification chip signal input pin positive pole connect in a series arrangement；
Signal ground successively with the second electric capacity, second resistance and left audio frequency amplification chip signal input pin negative pole to connect
Mode connects；
2nd rc high pass filter includes: the 3rd electric capacity and 3rd resistor, and the 4th electric capacity and the 4th resistance；
Wherein earphone right-channel signals send into right audio frequency amplification chip signal after sequentially passing through the 3rd electric capacity and 3rd resistor
Input pin positive pole, the 3rd electric capacity, 3rd resistor and right audio frequency amplification chip signal input pin positive pole connect in a series arrangement；
Signal ground successively with the 4th electric capacity, the 4th resistance and right audio frequency amplification chip signal input pin negative pole to connect
Mode connects；
Described first resistor, second resistance, 3rd resistor are consistent with the parameter of the 4th resistance, described first electric capacity, second
The parameter of electric capacity, the 3rd electric capacity and the 4th electric capacity is consistent.
Preferably, it is provided with the first magnetic bead, the second magnetic bead, the 5th electricity between left audio frequency amplification chip and the first speaker
Hold and be provided between the 6th electric capacity, and right audio frequency amplification chip and the second speaker the 3rd magnetic bead, the 4th magnetic bead, the 7th electricity
Hold and the 8th electric capacity；
Wherein, left audio frequency amplification chip signal output pin positive pole is connected to the first speaker, Zuo Yin by the first magnetic bead
Frequency amplification chip signal output pin negative pole is connected to the first speaker by the second magnetic bead, the first magnetic bead and the first speaker
Connecting line is connected with one end of the 5th electric capacity, and the other end of the 5th electric capacity is connected with signal ground, and the second magnetic bead is raised with first
The connecting line of sound device is connected with one end of the 6th electric capacity, and the other end of the 6th electric capacity is connected with signal ground；
Right audio frequency amplification chip signal output pin positive pole is connected to the second speaker by the 3rd magnetic bead, and right audio frequency amplifies
Chip signal output pin negative pole is connected to the second speaker by the 4th magnetic bead, the connecting line of the 3rd magnetic bead and the second speaker
It is connected with one end of the 7th electric capacity, the other end of the 7th electric capacity is connected with signal ground, the 4th magnetic bead and the second speaker
Connecting line is connected with one end of the 8th electric capacity, and the other end of the 8th electric capacity is connected with signal ground；
Described first magnetic bead, the second magnetic bead, the 3rd magnetic bead and the 4th magnetic bead parameter consistent, described 5th electric capacity, the 6th
The parameter of electric capacity, the 7th electric capacity and the 8th electric capacity is consistent；
Or substitute the first magnetic bead with the one 0 ohmage, the 2nd 0 ohmage substitutes the second magnetic bead, the 3rd 0 Europe simultaneously
Nurse resistance substitutes the 3rd magnetic bead and the 4th 0 ohmage substitutes the 4th magnetic bead.
Preferably, it is provided with the first antistatic device and second anti-quiet between left audio frequency amplification chip and the first speaker
It is provided with the 3rd antistatic device and the 4th antistatic device between electrical part, and right audio frequency amplification chip and the second speaker
Part；
Wherein, the negative pole end of the first antistatic device and the second antistatic device is respectively connecting to the two of the first speaker
End, the first antistatic device is all connected with signal ground with the positive terminal of the second antistatic device；3rd antistatic device and
The negative pole end of four antistatic devices is respectively connecting to the two ends of the second speaker, the 3rd antistatic device and the 4th antistatic device
Positive terminal be all connected with signal ground.
Preferably, also include: power management chip, its be set to left and right audio frequency amplification chip, central processing unit and
Audio processing chip is powered；The power supply of left and right audio frequency amplification chip adopts a vdd, and the power supply of central processing unit adopts second
Vdd, the power supply of audio processing chip adopts the 3rd vdd.
Preferably, it is provided with the 9th electric capacity between a vdd and left audio frequency amplification chip, and a vdd and right audio frequency
It is provided with the tenth electric capacity between amplification chip；
Wherein the first vdd is connected with one end of the 9th electric capacity with the connecting line of left audio frequency amplification chip, signal ground and
The other end of nine electric capacity connects, and a vdd is connected with one end of the tenth electric capacity with the connecting line of right audio frequency amplification chip, letter
Number ground wire is connected with the other end of the tenth electric capacity.
The present invention at least includes following beneficial effect:
Firstth, passing through to increase rc high pass filter and audio frequency amplification chip can make earphone left and right sound track signals export to double
Speaker.
Secondth, rc high pass filter and audio frequency amplification chip can remove low frequency noise interference be amplified to audio frequency and raise one's voice
Device can play amplitude.
3rd, make twin loudspeaker audio frequency result of broadcast stable by setting up magnetic bead and capacitor element.
4th, pass through to increase the antistatic effect that antistatic device can ensure speaker.
5th, pass through central processing unit, headset connector and high level and low level switched design can control audio frequency
Whether amplification chip works, and ensures the normal use of ear-phone function.
6th, pass through to arrange electric capacity between a vdd and audio frequency amplification chip, the effect of voltage regulation filtering can be reached.
Part is embodied by the further advantage of the present invention, target and feature by description below, and part also will be by this
Invention research and practice and be understood by the person skilled in the art.
Brief description
Fig. 1 is the signal transmission figure of the present invention；
Fig. 2 is the circuit connection diagram of the present invention；
Fig. 3 is the operating diagram of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to description literary composition
Word can be implemented according to this.
As Figure 1-3, the present invention provides a kind of side being converted into twin loudspeaker signal using earphone left and right sound track signals
Method, comprises the following steps:
Step one, will be hanging for the loudspeaker signal output pin output signal of audio processing chip；
Step 2, the earphone left and right sound channels signal exporting audio processing chip 1 export respectively to a rc high-pass filtering
Device 2 and the 2nd rc high pass filter 3；
Step 3, will be filtered after earphone left and right sound channels signal export respectively to left audio frequency amplification chip 4 and right audio frequency
Amplification chip 5 is amplified processing；
Step 4, the earphone left and right sound channels signal after processing and amplifying is exported respectively and raises one's voice to the first speaker 6 and second
Device 7.
In another embodiment, described audio processing chip 1, before output earphone left and right sound channels signal, also includes
Following steps:
Whether central processing unit detection electronic equipment has audio signal to export, and when audio signal output is detected, it continues
The headset plugging detection signal of continuous test earphone adapter output,
When earphone insertion is detected, central processing unit produces low level and enables signal and be delivered to left audio frequency amplification chip
4 and right audio frequency amplification chip 5, make left audio frequency amplification chip 4 and the enable signal of right audio frequency amplification chip 5 remain low level,
Left audio frequency amplification chip 4 and right audio frequency amplification chip 5 do not work, and earphone is as load exports audio signal；User can be normal
Accept audio signal using earphone, do not interfere with the normal use of earphone.
When detecting, the earless machine transplanting of rice is fashionable, and central processing unit produces high level and enables signal and be delivered to left audio frequency amplification core
Piece 4 and right audio frequency amplification chip 5, make left audio frequency amplification chip 4 and the enable signal of right audio frequency amplification chip 5 remain high electricity
Put down, left audio frequency amplification chip 4 and right audio frequency amplification chip 5 work, the first speaker 6 and the second speaker 7 are as load output
Audio signal.User is not inserted into earphone, can experience the first speaker 6 and the second speaker 7 plays the effect of audio frequency.
When central processing unit detects the output of electronic equipment no audio signal, central processing unit produces low level and enables letter
Number and be delivered to left audio frequency amplification chip 4 and right audio frequency amplification chip 5, make left audio frequency amplification chip 4 and right audio frequency amplification chip 5
Enable signal remain low level, left audio frequency amplification chip 4 and right audio frequency amplification chip 5 do not work, between after a while
Every after again circulating repetition judge, such as after interval of time t (such as t be set to 1s, 2s or 5s equivalent), centre
Reason device detects electronic equipment still no audio signal output, then central processing unit continues to produce low level enable signal and be delivered to
Left audio frequency amplification chip 4 and right audio frequency amplification chip 5, make left audio frequency amplification chip 4 and the enable signal of right audio frequency amplification chip 5
Remain low level, left audio frequency amplification chip 4 and right audio frequency amplification chip 5 do not work；For example through interval of time t (example
As t is set to that 1s, 2s or 5s are equivalent) after, central processing unit detects electronic equipment has audio signal to export, and it continues detection ear
The headset plugging detection signal of machine adapter output；So cycle criterion.
In another embodiment, described one group of loudspeaker signal output of 1 support of audio processing chip, do not support many
Group loudspeaker signal output.
In another embodiment, a rc high pass filter 2 and the 2nd rc high pass filter 3 are disposed as filtering
The audio signal of below 217hz.
The size of wherein resistance value rin determines left audio frequency amplification chip 4 and right audio frequency amplification chip 5 to input audio frequency letter
Number amplification, also together constitute a rc high pass filter with electric capacity, for some be easier introduce noise low
Frequency signal is filtered.Additionally, due to the amplitude usually amplitude of earphone signal of the audio signal required for speaker 6 times
Left and right, therefore can be according to amplification gain=2*150k/rin ≈ 6 (left audio frequency amplification chip 4 and the amplification of right audio frequency in this case
The audio frequency amplification chip aw8010 citing that chip 5 to end is, different audio frequency amplification chip amplification computing formula herein
It is slightly different), 51k ω can be chosen in conjunction with common resistance value rin；The sound typically to low frequency signal for the speaker of electronic equipment
Should be poor, in order to filter the interference of below 217hz audio signal, therefore can be calculated public according to the cut-off comment of high pass filter
Formula fc=1/ (2 π rincin) >=217hz, can choose 10nf in conjunction with common capacitance cin, in addition resistance value rin and electric capacity
The selection of the size of value cin can amplification according to actual needs and filter the difference of cut-off frequency and to adjust.
A kind of system being converted into twin loudspeaker signal using earphone left and right sound track signals, wherein, audio processing chip list
Loudspeaker signal output pin is disconnected with the connection of single speaker pin, and it includes audio processing chip 1 and central processing unit,
Also include:
First rc high pass filter 2 and the 2nd rc high pass filter 3, the headset left channel letter of described audio processing chip 1
Number output pin hph-l and earphone right-channel signals output pin hph-r is high with a rc high pass filter 2 and the 2nd rc respectively
Bandpass filter 3 connects；
Left audio frequency amplification chip 4 and right audio frequency amplification chip 5, it is high with a rc high pass filter 2 and the 2nd rc respectively
Bandpass filter 3 connects；And,
First speaker 6 and the second speaker 7, it is connected with left audio frequency amplification chip 4 and right audio frequency amplification chip 5 respectively
Connect.In another embodiment, a described rc high pass filter 2 and the 2nd rc high pass filter 3 are disposed as filtering
Below 217hz audio signal；
First rc high pass filter 2 includes: the first electric capacity c101 and first resistor r101, and the second electric capacity c102 and
Two resistance r102；
Wherein headset left channel signal is sent into left audio frequency and is amplified after sequentially passing through the first electric capacity c101 and first resistor r101
Chip signal input pin positive pole inp1, the first electric capacity c101, first resistor r101 and left audio frequency amplification chip signal input tube
Foot positive pole inp1 connects in a series arrangement；
Signal ground gnd successively with the second electric capacity c102, second resistance r102 and left audio frequency amplification chip signal input tube
Foot negative pole inn1 connects in a series arrangement；
2nd rc high pass filter 3 includes: the 3rd electric capacity c103 and 3rd resistor r103, and the 4th electric capacity c104 and
Four resistance r104；
Wherein earphone right-channel signals are sent into right audio frequency and are amplified after sequentially passing through the 3rd electric capacity c103 and 3rd resistor r103
Chip signal input pin positive pole inp2, the 3rd electric capacity c103,3rd resistor r103 and right audio frequency amplification chip signal input tube
Foot positive pole inp2 connects in a series arrangement；
Signal ground gnd successively with the 4th electric capacity c104, the 4th resistance r104 and right audio frequency amplification chip signal input tube
Foot negative pole inn2 connects in a series arrangement；
Described first resistor r101, second resistance r102,3rd resistor r103 and the 4th resistance r104 parameter consistent, institute
State the first electric capacity c101, the second electric capacity c102, the 3rd electric capacity c103 and the 4th electric capacity c104 parameter consistent；
Headset connector, its left and right sound channels signal input pin is respectively connecting to the headset left channel of audio processing chip 1
Signal output pin hph-l and earphone right-channel signals output pin hph-r, and, its headset detection pin connects to central authorities
Processor；
In addition the audio processing chip 1 in the system, central processing unit, left audio frequency amplification chip 4, right audio frequency amplification chip
5 and headset connector all have ground pin, its all ground pin is finally connected to signal ground gnd.
In another embodiment, between left audio frequency amplification chip 4 and the first speaker 6, it is provided with the first magnetic bead
B101, the second magnetic bead b102, the 5th electric capacity c105 and the 6th electric capacity c106, and right audio frequency amplification chip 5 and the second speaker 7
Between be provided with the 3rd magnetic bead b103, the 4th magnetic bead b104, the 7th electric capacity c107 and the 8th electric capacity c108；
Wherein, left audio frequency amplification chip signal output pin positive pole vop1 is connected by the first magnetic bead b101 and raises one's voice to first
Device 6, left audio frequency amplification chip signal output pin negative pole von1 is connected to the first speaker 6 by the second magnetic bead b102, and first
Magnetic bead b101 is connected with one end of the 5th electric capacity c105 with the connecting line of the first speaker 6, the other end of the 5th electric capacity c105
It is connected with signal ground gnd, the second magnetic bead b102 is connected with one end of the 6th electric capacity c106 with the connecting line of the first speaker 6,
The other end of the 6th electric capacity c106 is connected with signal ground gnd；
Right audio frequency amplification chip signal output pin positive pole vop2 is connected to the second speaker 7 by the 3rd magnetic bead b103,
Right audio frequency amplification chip signal output pin negative pole von2 is connected to the second speaker 7, the 3rd magnetic bead by the 4th magnetic bead b104
B103 is connected with one end of the 7th electric capacity c107 with the connecting line of the second speaker 7, the other end of the 7th electric capacity c107 and letter
Number ground wire gnd connects, and the 4th magnetic bead b104 is connected with one end of the 8th electric capacity c108 with the connecting line of the second speaker 7, and the 8th
The other end of electric capacity c108 is connected with signal ground gnd；
Described first magnetic bead b101, the second magnetic bead b102, the 3rd magnetic bead b103 and the 4th magnetic bead b104 parameter consistent, institute
State the 5th electric capacity c105, the 6th electric capacity c106, the 7th electric capacity c107 and the 8th electric capacity c108 parameter consistent；
Or substitute the first magnetic bead b101 with the one 0 ohmage, the 2nd 0 ohmage substitutes the second magnetic bead simultaneously
B102, the 3rd 0 ohmage substitutes the 3rd magnetic bead b103 and the 4th 0 ohmage substitutes the 4th magnetic bead b104.
In another embodiment, between left audio frequency amplification chip 4 and the first speaker 6, it is provided with the first antistatic device
Part cr101 and the second antistatic device cr102, and it is anti-to be provided with the 3rd between right audio frequency amplification chip 5 and the second speaker 7
Electrostatic devices cr103 and the 4th antistatic device cr104；
Wherein, the negative pole end of the first antistatic device cr101 and the second antistatic device cr102 is respectively connecting to first and raises
The two ends of sound device 6, the positive terminal of the first antistatic device cr101 and the second antistatic device cr102 is all with signal ground gnd even
Connect；The negative pole end of the 3rd antistatic device cr103 and the 4th antistatic device cr104 is respectively connecting to the two of the second speaker 7
End, the 3rd antistatic device cr103 is all connected with signal ground gnd with the positive terminal of the 4th antistatic device cr104.
Above-mentioned 4 antistatic device positions can select to paste electric capacity or tvs according to the demand of actual antistatic effect
Pipe or varistor, even do not paste.
In another embodiment, also include: power management chip, it is set to left audio frequency amplification chip 4 and the right side
Audio frequency amplification chip 5, central processing unit and audio processing chip 1 are powered；Left audio frequency amplification chip 4 and right audio frequency amplification chip 5
Power supply adopt a vdd10, the power supply of central processing unit adopts the 2nd vdd, and the power supply of audio processing chip 1 adopts the 3rd
vdd.
In another embodiment, between a vdd10 and left audio frequency amplification chip 4, it is provided with the 9th electric capacity c109,
And the first be provided with the tenth electric capacity c110 between vdd10 and right audio frequency amplification chip 5；
Wherein the first vdd10 is connected with one end of the 9th electric capacity c109 with the connecting line of left audio frequency amplification chip 4, signal ground
Line gnd is connected with the other end of the 9th electric capacity c109, and the connecting line and the tenth of a vdd10 and right audio frequency amplification chip 5
One end of electric capacity c110 connects, and signal ground gnd is connected with the other end of the tenth electric capacity c110.
A kind of method and system being converted into twin loudspeaker signal using earphone left and right sound track signals that the present invention provides, its
The earphone left and right sound channels signal that audio processing chip 1 is sent is respectively through left audio frequency amplification chip 4 and right audio frequency amplification chip
The first speaker 6 and the second speaker 7 is delivered to after 5 amplification, wherein left audio frequency amplification chip 4 and right audio frequency amplification chip 5
Enable signal to be sent by central processing unit, it enables signal high level, and effectively (i.e. left audio frequency amplification chip 4 and right audio frequency amplify core
The enable signal of piece 5 be high level when left audio frequency amplification chip 4 and right audio frequency amplification chip 5 work), in order at ordinary times when,
Left audio frequency amplification chip 4 and right audio frequency amplification chip 5 do not work, therefore the making of left audio frequency amplification chip 4 and right audio frequency amplification chip 5
On energy signal network, a drop-down 100k ω (can also select the value of 220k ω or 470k ω etc, choosing 100k ω is
One conventional value) resistance is to ground it is ensured that its low level.Wherein left audio frequency amplification chip 4 and the model of right audio frequency amplification chip 5
The audio frequency amplification chip aw8010 citing being to end is but it is also possible to be the audio frequency amplification chip of other models.In order to earphone is left
Sound channel signal and earphone right-channel signals input left audio frequency amplification chip 4 and right audio frequency respectively separately as a complete signal
Amplifying and to filter, in order to each signal constitutes a loop, the input of left audio frequency amplification chip 4 is provided with amplification chip 5
First resistor r101, second resistance r102, the first electric capacity c101 and the second electric capacity c102, and the input of right audio frequency amplification chip 5
End is provided with 3rd resistor r103, the 4th resistance r104, the 3rd electric capacity c103 and the 4th electric capacity c104, wherein headset left channel letter
Left audio frequency amplification chip signal input pin positive pole inp1 is sent into after number sequentially passing through the first electric capacity c101 and first resistor r101,
Left audio frequency amplification chip signal input pin negative pole inn1 is connected to after sequentially passing through second resistance r102 and the second electric capacity c102
Ground, constitutes a loop；Earphone right-channel signals send into right audio frequency after sequentially passing through the 3rd electric capacity c103 and 3rd resistor r103
Amplification chip signal input pin positive pole inp2, right audio frequency amplification chip signal input pin negative pole inn2 sequentially pass through the 4th electricity
It is connected to ground after resistance r104 and the 4th electric capacity c104, constitutes a loop, the left audio frequency of model aw8010 being according to Chinese mugwort is put
Large chip 4 and the characteristic of right audio frequency amplification chip 5, the size of wherein resistance value rin determines puts to input audio signal
Big multiple, also together constitutes a rc high pass filter with electric capacity, is easier to introduce the low frequency signal of noise for some
It is filtered.Additionally, due to 6 times about of the amplitude usually amplitude of earphone signal of the audio signal required for speaker, therefore
51k ω can be chosen in conjunction with common resistance value rin according to amplification gain=2*150k/rin ≈ 6；Electronic equipment
The speaker typically response to low frequency signal poor, in order to filter the interference of below 217hz audio signal, therefore can basis
Cut-off comment computing formula fc=1/ (2 π the rincin) >=217hz of rc high pass filter, permissible in conjunction with common capacitance cin
Choose 10nf, in addition the selection of the size of the value of resistance value rin and capacitance cin can amplification according to actual needs with
And filter the difference of cut-off frequency and to adjust.Finally for the input voltage of left audio frequency amplification chip 4 and right audio frequency amplification chip 5
First vdd10 stablizes, and can distinguish the 9th electric capacity c109 and the tenth electric capacity c110 in parallel thereon to ground, it is carried out surely
Filter pressing ripple, the stability in order to ensure its exports audio signal requires so as to meet fcc and ce Valuation Standard, can be every at it
Connecting on individual output channel, (its device position number is designated the first magnetic bead b101, the second magnetic bead b102, the 3rd magnetic bead to a magnetic bead
B103 and the 4th magnetic bead b104) and it is connected in parallel with a capacitor that (its device position number is designated the 5th electric capacity c105, the 6th electric capacity
C106, the 7th electric capacity c107 and the 8th electric capacity c108) to ground, if under the premise of cabling its signal quality shorter is preferable, in order to
Reduces cost further, its magnetic bead can be replaced with 0 ohmage, substitute the first magnetic bead with the one 0 ohmage simultaneously
B101, the 2nd 0 ohmage substitutes the second magnetic bead b102, and the 3rd 0 ohmage substitutes the 3rd magnetic bead b103 and the 4th 0 ohm of electricity
Resistance substitutes the 4th magnetic bead b104, and the 5th electric capacity c105, the 6th electric capacity c106, the 7th electric capacity c107 and the 8th electric capacity c108 can select
Select not paster；In order to ensure the antistatic effect of speaker, can arrive an antistatic device in parallel on each signal path
Ground, i.e. the first antistatic device cr101, the second antistatic device cr102, the 3rd antistatic device cr103 and the 4th antistatic
Device cr104, above-mentioned 4 antistatic device positions can according to the demand of actual antistatic effect, to select paste electric capacity or
Tvs pipe or varistor, even do not paste.
The power supply of left audio frequency amplification chip 4 and right audio frequency amplification chip 5 can adopt a vdd10, in electronic equipment
The power supply of central processor can adopt the 2nd vdd, and the power supply of audio processing chip 1 can adopt the 3rd vdd, and wherein first
The size of vdd10, the 2nd vdd, the 3rd vdd can pass through power supply pipe by the battery of intelligent terminal electron equipment according to actual needs
Produce after reason chip conversion, controlled by i2s signal and i2c signal between central processing unit and 1, Audio Processing core and pass
Transmission of data signal, the invention aims on the basis of the audio processing chip 1 only supporting a speaker output, profit
With its earphone left and right sound track signals be also one group stereosonic under the premise of support produce a two loudspeaker speaker stereo output effect,
Therefore the single speaker output signal of that group of audio processing chip 1 is hanging, the headset left channel signal of its earphone output and earphone are right
Sound channel signal delivers to headset connector respectively it is ensured that the stereo function of earphone, and respectively through left audio frequency amplification chip 4 and the right side
The first speaker 6 and the second speaker 7 is delivered to after audio frequency amplification chip 5 and its peripheral circuit, one of headset connector output
Headset plugging detection signal can be delivered to central processing unit to identify whether earphone inserts, and central processing unit produces left audio frequency and amplifies
The enable signal of chip 4 and right audio frequency amplification chip 5 is controlling left audio frequency amplification chip 4 and right audio frequency amplification chip 5 whether work
Make.
Electronic equipment, once during work, first judges whether it has audio signal to send, if it is not, keeping existing
Shape, after interval of time, circulating repetition judges again, if audio signal is sent, continues through headset plugging detection
Whether the change (not having during earphone insertion is high level, is changed into low level after having earphone insertion) of signal is informing central processing unit
There is earphone to insert, if central processing unit has recognized earphone insertion, show that user now needs earphone to be used as load
Carry out exports audio signal, therefore keep left audio frequency amplification chip 4 and the enable signal of right audio frequency amplification chip 5 to continue as low level,
Earphone normal work, if central processing unit does not recognize earphone insertion, shows that user now needs to raise one's voice using first
Device 6 and the second speaker 7 carry out exports audio signal as load, now draw high left audio frequency amplification chip 4 and right audio frequency amplifies core
The enable signal of piece 5, so as to work, so that the first speaker 6 and the second speaker 7 work, produces a kind of twin loudspeaker and stands
The effect of body sound.
A kind of it be converted into the method for twin loudspeaker signal using earphone left and right sound track signals and be using what the present invention provided
System, after above-mentioned steps, you can to export the first speaker 6 He using earphone to the amplification of earphone left and right sound channels signal
So as to complete a kind of effect of two loudspeaker speaker stereo output on second speaker 7, and also assures that earphone output function
Normal use, unaffected.
Although embodiment of the present invention is disclosed as above, it is not restricted to listed in description and embodiment
With, it can be applied to various suitable the field of the invention completely, for those skilled in the art, can be easily
Realize other modification, therefore under the general concept being limited without departing substantially from claim and equivalency range, the present invention does not limit
In specific details with shown here as the legend with description.
Claims (10)
1. a kind of method being converted into twin loudspeaker signal using earphone left and right sound track signals, wherein, the raising of audio processing chip
Sound device signal output pin output signal is vacantly it is characterised in that comprise the following steps:
Step one, the earphone left and right sound channels signal that audio processing chip is exported export respectively to a rc high pass filter and
2nd rc high pass filter；
Step 2, will be filtered after earphone left and right sound channels signal export respectively to left and right audio frequency amplification chip be amplified locate
Reason；
Step 3, the earphone left and right sound channels signal after processing and amplifying is exported respectively to the first speaker and the second speaker.
2. the method being converted into twin loudspeaker signal using earphone left and right sound track signals as claimed in claim 1, its feature exists
In described audio processing chip is before output earphone left and right sound channels signal, further comprising the steps of:
Whether central processing unit detection electronic equipment has audio signal to export, and when audio signal output is detected, it continues inspection
Survey the headset plugging detection signal of headset connector output,
When earphone insertion is detected, central processing unit produces low level and enables signal and be delivered to left and right audio frequency amplification chip,
The enable signal of left and right audio frequency amplification chip is made to remain low level, left and right audio frequency amplification chip does not work, earphone is as negative
Carry exports audio signal；
When detecting, the earless machine transplanting of rice is fashionable, and central processing unit produces high level and enables signal and be delivered to left and right audio frequency amplification core
Piece, makes the enable signal of left and right audio frequency amplification chip remain high level, left and right audio frequency amplification chip work, the first speaker
With the second speaker as load exports audio signal.
3. the method being converted into twin loudspeaker signal using earphone left and right sound track signals as claimed in claim 1, its feature exists
In described audio processing chip only supports one group of loudspeaker signal output, does not support multigroup loudspeaker signal output.
4. the method being converted into twin loudspeaker signal using earphone left and right sound track signals as claimed in claim 1, its feature exists
It is disposed as filtering the audio signal of below 217hz in, a rc high pass filter and the 2nd rc high pass filter.
5. a kind of system being converted into twin loudspeaker signal using earphone left and right sound track signals, wherein, audio processing chip list is raised
Sound device signal output pin is disconnected with the connection of single speaker pin, and it includes audio processing chip and central processing unit, and it is special
Levy and be, also include:
First rc high pass filter and the 2nd rc high pass filter, the earphone left and right sound channels signal of described audio processing chip is defeated
Go out pin to be connected with a rc high pass filter and the 2nd rc high pass filter respectively；
Left and right audio frequency amplification chip, it is connected with a rc high pass filter and the 2nd rc high pass filter respectively；And,
First speaker and the second speaker, it is connected with left and right audio frequency amplification chip respectively.
6. the system being converted into twin loudspeaker signal using earphone left and right sound track signals as claimed in claim 5, its feature exists
It is disposed as filtering below 217hz audio signal in, a described rc high pass filter and the 2nd rc high pass filter；
First rc high pass filter includes: the first electric capacity and first resistor, and the second electric capacity and second resistance；
Wherein headset left channel signal sends into left audio frequency amplification chip signal input after sequentially passing through the first electric capacity and first resistor
Pin positive pole, the first electric capacity, first resistor and left audio frequency amplification chip signal input pin positive pole connect in a series arrangement；
Signal ground is successively with the second electric capacity, second resistance and left audio frequency amplification chip signal input pin negative pole in a series arrangement
Connect；
2nd rc high pass filter includes: the 3rd electric capacity and 3rd resistor, and the 4th electric capacity and the 4th resistance；
Wherein earphone right-channel signals send into right audio frequency amplification chip signal input after sequentially passing through the 3rd electric capacity and 3rd resistor
Pin positive pole, the 3rd electric capacity, 3rd resistor and right audio frequency amplification chip signal input pin positive pole connect in a series arrangement；
Signal ground is successively with the 4th electric capacity, the 4th resistance and right audio frequency amplification chip signal input pin negative pole in a series arrangement
Connect；
Described first resistor, second resistance, 3rd resistor are consistent with the parameter of the 4th resistance, described first electric capacity, the second electric capacity,
The parameter of the 3rd electric capacity and the 4th electric capacity is consistent.
7. the system being converted into twin loudspeaker signal using earphone left and right sound track signals as claimed in claim 5, its feature exists
In, it is provided with the first magnetic bead, the second magnetic bead, the 5th electric capacity and the 6th electric capacity between left audio frequency amplification chip and the first speaker,
And it is provided with the 3rd magnetic bead, the 4th magnetic bead, the 7th electric capacity and the 8th electric capacity between right audio frequency amplification chip and the second speaker；
Wherein, left audio frequency amplification chip signal output pin positive pole is connected to the first speaker by the first magnetic bead, and left audio frequency is put
Large chip signal output pin negative pole is connected to the first speaker, the connection of the first magnetic bead and the first speaker by the second magnetic bead
Line is connected with one end of the 5th electric capacity, and the other end of the 5th electric capacity is connected with signal ground, the second magnetic bead and the first speaker
Connecting line be connected with one end of the 6th electric capacity, the other end of the 6th electric capacity is connected with signal ground；
Right audio frequency amplification chip signal output pin positive pole is connected to the second speaker by the 3rd magnetic bead, right audio frequency amplification chip
Signal output pin negative pole is connected to the second speaker by the 4th magnetic bead, the connecting line of the 3rd magnetic bead and the second speaker and
One end of seven electric capacity connects, and the other end of the 7th electric capacity is connected with signal ground, the connection of the 4th magnetic bead and the second speaker
Line is connected with one end of the 8th electric capacity, and the other end of the 8th electric capacity is connected with signal ground；
Described first magnetic bead, the second magnetic bead, the 3rd magnetic bead and the 4th magnetic bead parameter consistent, described 5th electric capacity, the 6th electric capacity,
The parameter of the 7th electric capacity and the 8th electric capacity is consistent；
Or substitute the first magnetic bead with the one 0 ohmage, the 2nd 0 ohmage substitutes the second magnetic bead, the 3rd 0 ohm of electricity simultaneously
Resistance substitutes the 3rd magnetic bead and the 4th 0 ohmage substitutes the 4th magnetic bead.
8. the system being converted into twin loudspeaker signal using earphone left and right sound track signals as claimed in claim 5, its feature exists
In, it is provided with the first antistatic device and the second antistatic device between left audio frequency amplification chip and the first speaker, and right
It is provided with the 3rd antistatic device and the 4th antistatic device between audio frequency amplification chip and the second speaker；
Wherein, the negative pole end of the first antistatic device and the second antistatic device is respectively connecting to the two ends of the first speaker, the
One antistatic device is all connected with signal ground with the positive terminal of the second antistatic device；3rd antistatic device and the 4th resists quiet
The negative pole end of electrical part is respectively connecting to the two ends of the second speaker, the positive pole of the 3rd antistatic device and the 4th antistatic device
End is all connected with signal ground.
9. the system being converted into twin loudspeaker signal using earphone left and right sound track signals as claimed in claim 5, its feature exists
In also including: power management chip, it is set to supply to left and right audio frequency amplification chip, central processing unit and audio processing chip
Electricity；The power supply of left and right audio frequency amplification chip adopts a vdd, and the power supply of central processing unit adopts the 2nd vdd, Audio Processing core
The power supply of piece adopts the 3rd vdd.
10. the system being converted into twin loudspeaker signal using earphone left and right sound track signals as claimed in claim 9, its feature exists
In being provided with the 9th electric capacity between a vdd and left audio frequency amplification chip, and set between a vdd and right audio frequency amplification chip
It is equipped with the tenth electric capacity；
Wherein the first vdd is connected with one end of the 9th electric capacity with the connecting line of left audio frequency amplification chip, signal ground and the 9th electricity
The other end held connects, and a vdd is connected with one end of the tenth electric capacity with the connecting line of right audio frequency amplification chip, signal ground
Line is connected with the other end of the tenth electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611020490.7A CN106358122A (en) | 2016-11-17 | 2016-11-17 | Method and system for converting signals of left and right sound tracks of earphone into dual-loudspeaker signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611020490.7A CN106358122A (en) | 2016-11-17 | 2016-11-17 | Method and system for converting signals of left and right sound tracks of earphone into dual-loudspeaker signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106358122A true CN106358122A (en) | 2017-01-25 |
Family
ID=57861530
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611020490.7A Pending CN106358122A (en) | 2016-11-17 | 2016-11-17 | Method and system for converting signals of left and right sound tracks of earphone into dual-loudspeaker signals |
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| CN1402956A (en) * | 1999-10-04 | 2003-03-12 | Srs实验室公司 | Acoustic correction apparatus |
| CN101065989A (en) * | 2004-11-29 | 2007-10-31 | 诺基亚公司 | A stereo widening network for two loudspeakers |
| CN103167381A (en) * | 2011-12-16 | 2013-06-19 | 三星电子株式会社 | Terminal having a plurality of speakers and method of operating the same |
| US20130208908A1 (en) * | 2008-10-31 | 2013-08-15 | Austriamicrsystems AG | Active Noise Control Arrangement, Active Noise Control Headphone and Calibration Method |
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2016
- 2016-11-17 CN CN201611020490.7A patent/CN106358122A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402956A (en) * | 1999-10-04 | 2003-03-12 | Srs实验室公司 | Acoustic correction apparatus |
| CN101065989A (en) * | 2004-11-29 | 2007-10-31 | 诺基亚公司 | A stereo widening network for two loudspeakers |
| US20130208908A1 (en) * | 2008-10-31 | 2013-08-15 | Austriamicrsystems AG | Active Noise Control Arrangement, Active Noise Control Headphone and Calibration Method |
| CN103167381A (en) * | 2011-12-16 | 2013-06-19 | 三星电子株式会社 | Terminal having a plurality of speakers and method of operating the same |
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Application publication date: 20170125 |