CN106131750A - A kind of audio amplification device, method and terminal - Google Patents
A kind of audio amplification device, method and terminal Download PDFInfo
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- CN106131750A CN106131750A CN201610719205.4A CN201610719205A CN106131750A CN 106131750 A CN106131750 A CN 106131750A CN 201610719205 A CN201610719205 A CN 201610719205A CN 106131750 A CN106131750 A CN 106131750A
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- audio frequency
- frequency amplifier
- voltage
- audio
- volume
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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
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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
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems
Abstract
The invention provides a kind of audio amplification device, method and terminal to include: application processor: for regulating volume and controlling the output voltage of DC source；DC source, is used for driving audio frequency amplifier；Digital to analog converter, is used for exporting audio signal to audio frequency amplifier；Audio frequency amplifier, for amplifying the audio signal received from described digital to analog converter and exporting；Described DC source supporting bus pressure regulation.The process of audio frequency amplifier PA pressure regulation of the present invention does not affect output tonequality.
Description
Technical field
The present embodiments relate to audio frequency amplifier voltage adjusting method, particularly relate to a kind of audio amplification device, method
And terminal.
Background technology
In existing field of mobile terminals, the scheme of low-power consumption audio frequency has a lot, and the most relatively new surely belongs to
" ClassH " scheme, as it is shown in figure 1, by the output voltage size inspecting digital to analog converter (DAC), regulation positive-negative power electricity
Pressure, follows the tracks of signal magnitude and does size variation, reduce the supply voltage of audio frequency amplifier (PA), thus reduce the mesh of power consumption
's.But existing scheme has many deficiencies:
1, left and right acoustic channels shares a set of DC source DC-DC (if not sharing a set of, then cost will double), due to a left side
The signal of R channel differs, and DC source DC-DC can only follow the tracks of the integrated value of left and right acoustic channels, but is all not equal to any one sound
Road, with the voltage of the variant part of left and right acoustic channels is for being exactly noise from the point of view of power supply, therefore ClassH power amplifier is work when,
From power supply, it is filled with our undesired noise voltage, eventually affects the tonequality that audio frequency amplifier (PA) exports；
2, the output of DC source DC-DC has no idea to be filtered (unfavorable to noise and response) by bulky capacitor,
DC source DC-DC can be caused cannot to follow the tracks of the size variation of signal and change if having added bulky capacitor.Therefore at big signal
During, most of electric current all takes from DC source DC-DC, requires non-to the transient response of DC source DC-DC
Chang Gao, general DC source DC-DC cannot respond to sudden high currents (the minimum response cycle is a clock cycle), due to
Energy can not provide from bulky capacitor, also allow for moment can not get abundance energy supply, can cause and dynamics occurs in sense of hearing
Inadequate phenomenon；
3 as in figure 2 it is shown, when signal swings toward positive-negative half-cycle, positive-negative power is to increase to reduce voltage simultaneously.Signal
During toward the swing of positive half cycle, the supply voltage that the change of negative half period power supply recommends pipe for negative rail is fluctuation, because negative rail
The internal resistance of push-pull transistor is not infinitely-great, say, that PSSR is not infinitely-great, and therefore the fluctuation on negative supply will be logical
Cross transistor and flow to outfan, cause the variation of tonequality；
4, when voltage little to a certain extent when, voltage can not continue reduce, otherwise can cause the exception that PA works, example
Such as the exception of biasing circuit, the flex point between therefore there is a change in voltage and not changing, this flex point is drawn back into big
The higher hamonic wave of amount, has influence on tonequality；
5, changing due to the change of DC source DC-DC output voltage to be followed, audio frequency amplifier PA own just has distortion,
So DC source DC-DC goes to follow the tracks of the change of output, and the output distortion of DC source DC-DC can be bigger, (if little
Words, directly just just can be able to export after the output stopping direct current of DC source DC-DC), according to current technology, distortion meeting
Bigger, these distortions show as noise on the power supply of audio frequency amplifier PA, and these noises also can scurry into output, final shadow
Ring to tonequality；
6, near due to signal zero crossing, the voltage of positive-negative power all ratios are relatively low, now inclined within audio frequency amplifier PA
Circuits is operated in critical state, and performance can change, and can cause the quiescent point of amplifier, frequency response, revolution rate, mistake
Adjust the characteristic such as voltage, offset current, distorted characteristic, bandwidth to change, due to zero crossing be signal the most weak when, this time
Waiting the impact of this part of superposition, the impact on sound especially becomes big.
Summary of the invention
It is an object of the invention to provide a kind of audio amplification device, method and terminal.
The present invention provides a kind of audio amplification device, including:
Application processor: for regulating volume and controlling the output voltage of DC source；
DC source, for providing power supply to audio frequency amplifier；
Digital to analog converter, is used for exporting audio signal to audio frequency amplifier；
Audio frequency amplifier, for amplifying the audio signal received from described digital to analog converter and exporting；
Described DC source supporting bus pressure regulation.
Preferably, described application processor also includes a preset volume and audio frequency amplifier voltage mapping table, for when using
During the regulation volume of family, regulate the voltage of audio frequency amplifier according to described volume and audio frequency amplifier voltage mapping table.
Preferably, also including linear voltage regulator, described linear voltage regulator is controlled by described application processor direct signal, uses
In reducing the impact on audio frequency amplifier of the DC source output noise.
Preferably, the output voltage of described DC source is more than the output voltage of described linear voltage regulator.
The present invention provides a kind of terminal, including an any of the above-described described audio amplification device.
The present invention also provides for another kind of audio amplification device, including:
Application processor: for regulating volume and controlling the output voltage of DC source；
DC source, for providing power supply to audio frequency amplifier；
Digital to analog converter, is used for exporting audio signal to audio frequency amplifier；
Audio frequency amplifier, for amplifying the audio signal received from described digital to analog converter and exporting；
Digital regulation resistance, regulates the voltage of described DC source for the resistance by regulating described digital regulation resistance.
Preferably, described application processor also includes a preset volume, audio frequency amplifier voltage and digital regulation resistance resistance
Mapping table, for when user regulates volume, comes by regulation numeral according to described volume and audio frequency amplifier voltage mapping table
Potentiometer resistance regulates the voltage of audio frequency amplifier.
Preferably, also including linear voltage regulator, described linear voltage regulator is controlled by described application processor direct signal, uses
In reducing the impact on audio frequency amplifier of the DC source output noise.
Preferably, the output voltage of described DC source is more than the output voltage of described linear voltage regulator.
The present invention also provides for a kind of terminal, including an any of the above-described described audio amplification device.
Another audio amplification method of the present invention, including:
S100 is a preset volume and audio frequency amplifier voltage mapping table in application processor；
S101 user regulates volume and by the output voltage of bus marco DC source；
S102 digital to analog converter output audio signal is to audio frequency amplifier；
DC source described in S103 drives the work of described audio frequency amplifier；
The audio signal received from described digital to analog converter is amplified and exports by audio frequency amplifier described in S104.
Preferably, described S101 also includes that user regulates volume and by the output voltage of the linear manostat of bus marco,
For reducing the impact on audio frequency amplifier of the DC source output noise.
Preferably, the output voltage of described DC source is more than the output voltage of described linear voltage regulator.
Preferably, described S100 sets up the step of volume and audio frequency amplifier voltage mapping table and is
S1001 creates the single sinusoidal wave pure tone file of a 1Khz, uses application processor to play out, is exported by audio frequency
It is connected to audio frequency amplifier；
The voltage of audio frequency amplifier is set to DC power output voltage maximum by S1002, and is set to max volume
Output, is read the distortion of audio frequency amplifier output by audio analyzer；
S1003 is gradually reduced the output voltage of DC source, until the distortion that audio frequency amplifier is tested starts to become big, and will
Corresponding audio frequency amplifier voltage record is in the table；
Volume is reduced 0.5～1dB by S1004, continues to turn down the output voltage of DC source, until audio frequency amplifier is tested
To distortion start to become big, continue the voltage by DC source exports and recorded in audio frequency amplifier magnitude of voltage corresponding for-1dB；
S1005 repeats S1004, until the maximum attenuation amount that volume controls, DC source output corresponding for all volumes
Voltage all records complete, calls for volume control module.
Preferably, described S101 also includes: the volume control module when user changes volume when, in application processor
Can check the output data of digital to analog converter, when finding zero crossing, rapidly regulation volume controls, and according to preset volume with
Audio frequency amplifier voltage mapping table carries out audio frequency amplifier Control of Voltage.
The present invention provides a kind of audio amplification method, including:
S10 is a preset volume, audio frequency amplifier voltage and digital regulation resistance resistance mapping table in application processor；
S11 user regulates volume the output voltage by digital regulation resistance regulation DC source；
S12 digital to analog converter output audio signal is to audio frequency amplifier；
DC source described in S13 drives the work of described audio frequency amplifier；
The audio signal received from described digital to analog converter is amplified and exports by audio frequency amplifier described in S14.
Preferably, described S11 also includes that user regulates volume and by the output of digital regulation resistance linear adjustment manostat
Voltage, for reducing the impact on audio frequency amplifier of the DC source output noise.
Preferably, the output voltage of described DC source is more than the output voltage of described linear voltage regulator.
Preferably, described S10 sets up the step of volume, audio frequency amplifier voltage and digital regulation resistance resistance mapping table and is
S1101 creates the single sinusoidal wave pure tone file of a 1Khz, uses application processor to play out, is exported by audio frequency
It is connected to audio frequency amplifier；
The voltage of audio frequency amplifier is set to DC power output voltage maximum by S1102, and is set to max volume
Output, is read the distortion of audio frequency amplifier output by audio analyzer；
S1103 adjusts the resistance of digital regulation resistance, is gradually reduced the output voltage of DC source, until audio frequency amplifier is surveyed
The distortion tried starts to become big, by corresponding audio frequency amplifier voltage and digital regulation resistance resistance record in the table；
Volume is reduced 0.5～1dB by S1104, and the resistance continuing adjustment digital regulation resistance turns down the output electricity of DC source
Pressure, until the distortion that audio frequency amplifier is tested starts to become big, continues that the voltage that DC source exports be recorded-1dB corresponding
Audio frequency amplifier magnitude of voltage and digital regulation resistance resistance in；
S1105 repeats S1104, until the maximum attenuation amount that volume controls, DC source output corresponding for all volumes
Voltage and digital regulation resistance resistance all record complete, call for volume control module.
Preferably, described S11 also includes: the volume control module when user changes volume when, in application processor
Can check the output data of digital to analog converter, when finding zero crossing, rapidly regulation volume controls, and according to preset volume,
Audio frequency amplifier voltage and digital regulation resistance resistance mapping table carry out audio frequency amplifier Control of Voltage.
The invention has the beneficial effects as follows, 1, the process of audio frequency amplifier PA pressure regulation of the present invention do not affect output tonequality；2, institute
State audio frequency amplifier PA pressure regulation to occur when volume changes, and when being and find zero crossing, carry out the regulation of volume and voltage
To now positive-negative power to output be symmetrical, change in voltage produce noise cancel out each other, be not transmitted on lead-out terminal, right
Sound effect does not affects；3, it is according to the pure tone peak value system when this level of sound volume due to audio frequency amplifier PA voltage
Fixed, do not have the difference between left and right acoustic channels, would not have the problem interfered by left and right acoustic channels yet；4, due to audio frequency amplifier
The voltage of PA is to obtain according to this volume maximum sinusoidal crest value, therefore in audio frequency playing process, and the electricity of audio frequency amplifier PA
Pressure is constant, also also would not would not introduce the noise output to audio frequency amplifier PA with the presence of the flex point of change in voltage
End；5, due to when audio frequency amplifier PA works voltage constant, it is possible to DC source DC-DC back increase bulky capacitor reach
To more preferable filter effect, add the dynamic characteristic of power supply simultaneously.6, due to when audio frequency amplifier PA works voltage constant, can
To link, further with DC source DC-DC running voltage at DC source DC-DC back increase linear voltage regulator LDO
The impact on audio frequency amplifier PA of the noise of reduction DC source DC-DC；7, the running voltage of audio frequency amplifier PA is by just
In the case of string ripple is distortionless, calibration obtains, and voltage meets the demand of bias voltage, thus without having at signal close to zero crossing
Time brownout problem occur, also would not produce the problem that small volume makes audio distortion increase.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is this
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the audio amplifier circuit schematic diagram of prior art；
Fig. 2 is that prior art audio frequency amplifies output signal swing curve figure；
Fig. 3 is a kind of audio amplification device schematic diagram of the present invention；
Fig. 4 is the another kind of audio amplification device schematic diagram of the present invention；
Fig. 5 is a kind of audio amplification method schematic diagram of the present invention；
Fig. 6 is the another kind of audio amplification method schematic diagram of the present invention；
Fig. 7 is volume of the present invention and audio frequency amplifier voltage mapping table method for building up schematic flow sheet；
Fig. 8 is volume of the present invention, audio frequency amplifier voltage and the signal of digital regulation resistance resistance mapping table method for building up flow process
Figure；
Fig. 9 is digital regulation resistance structural representation of the present invention.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
As it is shown on figure 3, a kind of audio amplification device schematic diagram of the present invention, including application processor: be used for regulating volume
And control the output voltage of DC source；DC source, is used for driving audio frequency amplifier；Digital to analog converter, is used for exporting audio frequency
Signal is to audio frequency amplifier；Audio frequency amplifier, for amplifying the audio signal received from described digital to analog converter and exporting.
In the present embodiment, described DC source supporting bus pressure regulation.Wherein, described bus can be I2C bus or other there is tune
The bus of pressure function, skilled person will appreciate that, I2C bus is a citing, is not intended as the restriction of the present invention.Enter one
Step ground, in the present embodiment, by directly being controlled the voltage output of DC source by volume control module rather than being turned by digital-to-analogue
Parallel operation (DAC) controls the voltage of DC source, thus makes the process of audio frequency amplifier PA pressure regulation not affect output tonequality.
Further, described application processor also includes a preset volume and audio frequency amplifier voltage mapping table, for working as
When user regulates volume, regulate the voltage of audio frequency amplifier according to described volume and audio frequency amplifier voltage mapping table.
As shown in Figure 4, in another embodiment of the present invention, also include linear voltage regulator, described linear voltage regulator by
Described application processor direct signal controls, for reducing the impact on audio frequency amplifier of the DC source output noise.Wherein, institute
State the output voltage output voltage more than described linear voltage regulator of DC source.Owing to when audio frequency amplifier PA works, voltage is not
Become, linear voltage regulator LDO can be increased in DC source DC-DC back and link with DC source DC-DC running voltage, enter
One step reduces the impact on audio frequency amplifier PA of the noise of DC source DC-DC.
If described DC source DC-DC not supporting bus pressure regulation, then can be by the voltage at DC source DC-DC
Set and resistance is placed digital regulation resistance, regulate the voltage of DC-DC by regulating the resistance of digital regulation resistance.Concrete bag
Include: application processor: for regulating volume and controlling the output voltage of DC source；DC source, is used for driving audio frequency to amplify
Device；Digital to analog converter, is used for exporting audio signal to audio frequency amplifier；Audio frequency amplifier, being used for will be from described digital to analog converter
The audio signal received is amplified and exports；Digital regulation resistance, as it is shown in figure 9, for by regulating described digital regulation resistance
Resistance regulates the voltage of described DC source.Further, described application processor also includes that a preset volume, audio frequency amplify
Device voltage and digital regulation resistance resistance mapping table, for when user regulates volume, according to described volume and audio frequency amplifier electricity
Pressure mapping table regulates the voltage of audio frequency amplifier by regulation digital regulation resistance resistance.
In a preferred embodiment of the invention, also including linear voltage regulator, described linear voltage regulator is by described application
Processor direct signal controls, for reducing the impact on audio frequency amplifier of the DC source output noise.Further, described directly
The output voltage of stream power supply is more than the output voltage of described linear voltage regulator.Wherein, the output voltage of described DC source is more than
The output voltage of described linear voltage regulator.Owing to when audio frequency amplifier PA works, voltage is constant, can be after DC source DC-DC
Limit increases linear voltage regulator LDO and links with DC source DC-DC running voltage, reduces DC source DC-DC's further
The noise impact on audio frequency amplifier PA.
The present invention also protects a kind of terminal to include the technical scheme described in an any of the above-described embodiment.
A kind of audio amplification method schematic diagram of the present invention as shown in Figure 5, including: S100 in application processor preset one
Individual volume and audio frequency amplifier voltage mapping table；S101 user regulates volume and by the output electricity of bus marco DC source
Pressure；S102 digital to analog converter output audio signal is to audio frequency amplifier；DC source described in S103 drives described audio frequency amplifier
Work；The audio signal received from described digital to analog converter is amplified and exports by audio frequency amplifier described in S104.Further,
Described S101 also includes that user regulates volume and by the output voltage of the linear manostat of bus marco, is used for reducing DC source
The output noise impact on audio frequency amplifier.Preferably, the output voltage of described DC source is more than described linear voltage regulator
Output voltage.It is further preferred that described S101 also includes: the volume when user changes volume when, in application processor
Control module can check the output data of digital to analog converter, and when finding zero crossing, regulation volume controls rapidly, and according to preset
Volume and audio frequency amplifier voltage mapping table carry out audio frequency amplifier Control of Voltage.
As it is shown in fig. 7, volume of the present invention and audio frequency amplifier voltage mapping table (table 1.1) method for building up schematic flow sheet；
Described S100 sets up volume: S1001 creates the single sinusoidal wave pure of a 1Khz
Sound file, uses application processor to play out, and audio frequency output is connected to audio frequency amplifier；S1002 is by audio frequency amplifier
Voltage is set to DC power output voltage maximum, and is set to max volume output, audio analyzer read audio frequency
Amplifier reads the distortion of output；S1003 is gradually reduced the output voltage of DC source, until what audio frequency amplifier was tested
Distortion starts to become big, by corresponding audio frequency amplifier voltage record in the table；Volume is reduced 0.5～1dB by S1004, continues
Turn down the output voltage of DC source, until the distortion that audio frequency amplifier is tested starts to become big, continue to export DC source
Voltage recorded in audio frequency amplifier magnitude of voltage corresponding for-1dB；S1005 repeats S1004, until the maximum that volume controls declines
Decrement, all records DC power output voltage corresponding for all volumes complete, calls for volume control module.
| Volume | The voltage of audio frequency PA |
| 0dB | +-8V |
| -1dB | +-7.3V |
| -2dB | +-6.35V |
| -3dB | +-5.66V |
| -4dB | +-5.05V |
| -5dB | +-4.5V |
| -6dB | +-4V |
| …… | …… |
Table 1.1 volume and audio frequency amplifier voltage mapping table
During in table 1.1,0dB is S1002, max volume output, skilled person will appreciate that, table 1.1 is only the present invention
An example, be not limitation of the present invention.Those skilled in the art can be worked according to actual feelings by non-creativeness
Condition arbitrarily changes form.
The another kind of audio amplification method schematic diagram of the present invention as shown in Figure 6；Including: S10 in application processor preset
One volume, audio frequency amplifier voltage and digital regulation resistance resistance mapping table；S11 user regulates volume and passes through digital regulation resistance
The output voltage of regulation DC source；S12 digital to analog converter output audio signal is to audio frequency amplifier；DC source described in S13
Described audio frequency amplifier is driven to work；The audio signal received from described digital to analog converter is put by audio frequency amplifier described in S14
Big and export.Further, described S11 also includes that user regulates volume and passes through the defeated of digital regulation resistance linear adjustment manostat
Go out voltage, for reducing the impact on audio frequency amplifier of the DC source output noise.The output voltage of described DC source is more than
The output voltage of described linear voltage regulator.It is further preferred that described S11 also includes: when user changes volume when, application
Volume control module in processor can check the output data of digital to analog converter, when finding zero crossing, regulates rapidly volume
Control, and carry out audio frequency amplifier voltage according to preset volume, audio frequency amplifier voltage and digital regulation resistance resistance mapping table
Control.
As shown in Figure 8, volume of the present invention, audio frequency amplifier voltage and digital regulation resistance resistance mapping table (table 1.2) are set up
Method flow schematic diagram.S10 of the present invention sets up volume, audio frequency amplifier voltage and the step of digital regulation resistance resistance mapping table
Suddenly it is: S1101 creates the single sinusoidal wave pure tone file of a 1Khz, uses application processor to play out, by audio frequency output even
Receive audio frequency amplifier；The voltage of audio frequency amplifier is set to DC power output voltage maximum by S1102, and is set to
Big volume output, is read audio frequency amplifier by audio analyzer and reads the distortion of output；S1103 adjusts the resistance of digital regulation resistance
Value, is gradually reduced the output voltage of DC source, until the distortion that audio frequency amplifier is tested starts to become big, by corresponding audio frequency
Amplifier voltage and digital regulation resistance resistance record are in the table；Volume is reduced 0.5～1dB by S1104, continues to adjust numeral electricity
The resistance of position device turns down the output voltage of DC source, until the distortion that audio frequency amplifier is tested starts to become big, continuing will be straight
The voltage of stream power supply output recorded in audio frequency amplifier magnitude of voltage corresponding for-1dB and digital regulation resistance resistance；S1105 repeats
S1104, until the maximum attenuation amount that volume controls, hinders DC power output voltage corresponding for all volumes and digital regulation resistance
Value all records complete, calls for volume control module.
| Volume | The voltage of audio frequency PA | Digital potentiometer resistance |
| 0dB | +-8V | 110kΩ |
| -1dB | +-7.3V | 100kΩ |
| -2dB | +-6.35V | 87kΩ |
| -3dB | +-5.66V | 78kΩ |
| -4dB | +-5.05V | 69kΩ |
| -5dB | +-4.5V | 62kΩ |
| -6dB | +-4V | 55kΩ |
| …… | …… | …… |
Table 1.2 volume, audio frequency amplifier voltage and digital regulation resistance resistance mapping table
During in table 1.2,0dB is S1102, max volume output, skilled person will appreciate that, table 1.2 is only the present invention
An example, be not limitation of the present invention.Those skilled in the art can be worked according to actual feelings by non-creativeness
Condition arbitrarily changes form.
Further, in one embodiment of the invention, preferred version as shown in Figure 6, do not support pressure regulation in bus
Time, introduce described digital regulation resistance and assist to reconcile the output voltage of DC source DC-DC, now, further add linear steady
Depressor LDO, adds DC source DC-in the most preset volume, audio frequency amplifier voltage and digital regulation resistance resistance mapping table
The magnitude of voltage of DC, as shown in following table 1.3.
| Volume | DC-DC output voltage | The voltage of audio frequency PA | Digital potentiometer resistance |
| 0dB | +-8.1V | +-8V | 110 |
| -1dB | +-7.4V | +-7.3V | 100 |
| -2dB | +-6.45V | +-6.35V | 87 |
| -3dB | +-5.76V | +-5.66V | 78 |
| -4dB | +-5.15V | +-5.05V | 69 |
| -5dB | +-4.6V | +-4.5V | 62 |
| -6dB | +-4.1V | +-4V | 55 |
| …… | …… | …… |
Table 1.3 volume, audio frequency amplifier voltage and digital regulation resistance resistance mapping table
In upper table, the voltage of audio frequency amplifier PA is the output voltage of linear voltage regulator LDO.Equally, art technology
Personnel understand, and table 1.3 is only an example of the present invention, is not limitation of the present invention.Those skilled in the art are permissible
Worked by non-creativeness and arbitrarily change form according to practical situation.It addition, after we eliminate addition linear voltage regulator LDO
Volume, audio frequency amplifier voltage mapping table, this table only need to delete that string of digital regulation resistance resistance.
In sum, it is an advantage of the invention that 1, the process of audio frequency amplifier PA pressure regulation of the present invention does not affect output tonequality；
2, described audio frequency amplifier PA pressure regulation occurs when volume changes, and carries out volume and voltage when being and find zero crossing
Regulate to now positive-negative power to output be symmetrical, change in voltage generation noise cancel out each other, be not transmitted to lead-out terminal
On, sound effect is not affected；3, it is to enter according to the pure tone peak value when this level of sound volume due to audio frequency amplifier PA voltage
Row is formulated, and does not have the difference between left and right acoustic channels, also would not have the problem interfered by left and right acoustic channels；4, put due to audio frequency
The voltage of big device PA is to obtain according to this volume maximum sinusoidal crest value, therefore in audio frequency playing process, and audio frequency amplifier PA
Voltage be constant, also also would not would not introduce noise to audio frequency amplifier PA's with the presence of the flex point of change in voltage
Outfan；5, due to when audio frequency amplifier PA works voltage constant, it is possible to DC source DC-DC back increase bulky capacitor
Reach more preferable filter effect, add the dynamic characteristic of power supply simultaneously.6, owing to when audio frequency amplifier PA works, voltage is not
Become, linear voltage regulator LDO can be increased in DC source DC-DC back and link with DC source DC-DC running voltage, enter
One step reduces the impact on audio frequency amplifier PA of the noise of DC source DC-DC；7, the running voltage of audio frequency amplifier PA is logical
Cross sinusoidal wave distortionless in the case of calibrate and obtain, voltage meets the demand of bias voltage, thus without having at signal close to mistake
During zero point, the problem of brownout occurs, also would not produce the problem that small volume makes audio distortion increase.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；To the greatest extent
The present invention has been described in detail by pipe with reference to foregoing embodiments, it will be understood by those within the art that: it depends on
So the technical scheme described in foregoing embodiments can be modified, or the most some or all of technical characteristic is entered
Row equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention technology
The scope of scheme.
Claims (20)
1. an audio amplification device, it is characterised in that including:
Application processor: for regulating volume and controlling the output voltage of DC source；
DC source, for providing power supply to audio frequency amplifier；
Digital to analog converter, is used for exporting audio signal to audio frequency amplifier；
Audio frequency amplifier, for amplifying the audio signal received from described digital to analog converter and exporting；
Described DC source supporting bus pressure regulation.
Audio amplification device the most according to claim 1, it is characterised in that described application processor also includes a preset sound
Amount and audio frequency amplifier voltage mapping table, for when user regulates volume, reflect with audio frequency amplifier voltage according to described volume
Firing table regulates the voltage of audio frequency amplifier.
Audio amplification device the most according to claim 1, it is characterised in that also include linear voltage regulator is described linear steady
Depressor is controlled by described application processor direct signal, for reducing the impact on audio frequency amplifier of the DC source output noise.
Audio amplification device the most according to claim 3, it is characterised in that the output voltage of described DC source is more than institute
State the output voltage of linear voltage regulator.
5. an audio amplification device, it is characterised in that including:
Application processor: for regulating volume and controlling the output voltage of DC source；
DC source, for providing power supply to audio frequency amplifier；
Digital to analog converter, is used for exporting audio signal to audio frequency amplifier；
Audio frequency amplifier, for amplifying the audio signal received from described digital to analog converter and exporting；
Digital regulation resistance, regulates the voltage of described DC source for the resistance by regulating described digital regulation resistance.
Audio amplification device the most according to claim 5, it is characterised in that described application processor also includes a preset sound
Amount, audio frequency amplifier voltage and digital regulation resistance resistance mapping table, for when user regulates volume, according to described volume and sound
Audio amplifier voltage mapping table regulates the voltage of audio frequency amplifier by regulation digital regulation resistance resistance.
Audio amplification device the most according to claim 5, it is characterised in that also include linear voltage regulator is described linear steady
Depressor is controlled by described application processor direct signal, for reducing the impact on audio frequency amplifier of the DC source output noise.
Audio amplification device the most according to claim 7, it is characterised in that the output voltage of described DC source is more than institute
State the output voltage of linear voltage regulator.
9. a terminal, it is characterised in that include an arbitrary described audio amplification device in Claims 1 to 4.
10. a terminal, it is characterised in that include an arbitrary described audio amplification device in claim 5～8.
11. 1 kinds of audio amplification method, it is characterised in that including:
S100 is a preset volume and audio frequency amplifier voltage mapping table in application processor；
S101 user regulates volume and by the output voltage of bus marco DC source；
S102 digital to analog converter output audio signal is to audio frequency amplifier；
DC source described in S103 drives the work of described audio frequency amplifier；
The audio signal received from described digital to analog converter is amplified and exports by audio frequency amplifier described in S104.
12. audio amplification method according to claim 11, it is characterised in that described S101 also includes that user regulates volume
And by the output voltage of the linear manostat of bus marco, for reducing the DC source output noise shadow to audio frequency amplifier
Ring.
13. audio amplification method according to claim 12, it is characterised in that the output voltage of described DC source is more than
The output voltage of described linear voltage regulator.
14. audio amplification method according to claim 11, it is characterised in that described S100 sets up volume and amplifies with audio frequency
The step of device voltage mapping table is
S1001 creates the single sinusoidal wave pure tone file of a 1Khz, uses application processor to play out, and audio frequency output is connected
To audio frequency amplifier；
The voltage of audio frequency amplifier is set to DC power output voltage maximum by S1002, and is set to max volume output,
The distortion of audio frequency amplifier output is read by audio analyzer；
S1003 is gradually reduced the output voltage of DC source, until the distortion that audio frequency amplifier is tested starts to become big, by correspondence
Audio frequency amplifier voltage record in the table；
Volume is reduced 0.5～1dB by S1004, continues to turn down the output voltage of DC source, until what audio frequency amplifier was tested
Distortion starts to become big, continues the voltage by DC source exports and recorded audio frequency amplifier magnitude of voltage corresponding for-1dB；
S1005 repeats S1004, until the maximum attenuation amount that volume controls, DC power output voltage corresponding for all volumes
All record complete, call for volume control module.
15. audio amplification method according to claim 11, it is characterised in that described S101 also includes: when user changes
The when of volume, the volume control module in application processor can check the output data of digital to analog converter, when finding zero crossing
Time, regulation volume controls rapidly, and carries out audio frequency amplifier voltage according to preset volume and audio frequency amplifier voltage mapping table
Control.
16. 1 kinds of audio amplification method, it is characterised in that including:
S10 is a preset volume, audio frequency amplifier voltage and digital regulation resistance resistance mapping table in application processor；
S11 user regulates volume the output voltage by digital regulation resistance regulation DC source；
S12 digital to analog converter output audio signal is to audio frequency amplifier；
DC source described in S13 drives the work of described audio frequency amplifier；
The audio signal received from described digital to analog converter is amplified and exports by audio frequency amplifier described in S14.
17. audio amplification method according to claim 16, it is characterised in that described S11 also includes that user regulates volume
And by the output voltage of digital regulation resistance linear adjustment manostat, be used for reducing DC source output noise to audio frequency amplifier
Impact.
18. audio amplification method according to claim 17, it is characterised in that the output voltage of described DC source is more than
The output voltage of described linear voltage regulator.
19. audio amplification method according to claim 16, it is characterised in that described S10 sets up volume and amplifies with audio frequency
The step of device voltage mapping table is
S1101 creates the single sinusoidal wave pure tone file of a 1Khz, uses application processor to play out, and audio frequency output is connected
To audio frequency amplifier；
The voltage of audio frequency amplifier is set to DC power output voltage maximum by S1102, and is set to max volume output,
The distortion of audio frequency amplifier output is read by audio analyzer；
S1103 adjusts the resistance of digital regulation resistance, is gradually reduced the output voltage of DC source, until audio frequency amplifier is tested
Distortion start to become big, by corresponding audio frequency amplifier voltage and digital regulation resistance resistance record in the table；
Volume is reduced 1dB by S1104, and the resistance continuing adjustment digital regulation resistance turns down the output voltage of DC source, until sound
The distortion that audio amplifier is tested starts to become big, continues that the voltage that DC source exports be recorded audio frequency corresponding for-1dB and amplifies
In device magnitude of voltage and digital regulation resistance resistance；
S1105 repeats S1104, until the maximum attenuation amount that volume controls, DC power output voltage corresponding for all volumes
And digital regulation resistance resistance all records complete, call for volume control module.
20. audio amplification method according to claim 16, it is characterised in that described S11 also includes: when user changes sound
The when of amount, the volume control module in application processor can check the output data of digital to analog converter, when finding zero crossing,
Regulation volume controls rapidly, and carries out sound according to preset volume, audio frequency amplifier voltage and digital regulation resistance resistance mapping table
Audio amplifier Control of Voltage.
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| CN201610719205.4A CN106131750B (en) | 2016-08-25 | 2016-08-25 | Audio amplification device, method and terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610719205.4A CN106131750B (en) | 2016-08-25 | 2016-08-25 | Audio amplification device, method and terminal |
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| CN106131750B (en) | 2022-04-01 |
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