CN106101936A - A kind of audio amplification device based on music maximum level, method and terminal - Google Patents
A kind of audio amplification device based on music maximum level, method and terminal Download PDFInfo
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- CN106101936A CN106101936A CN201610717137.8A CN201610717137A CN106101936A CN 106101936 A CN106101936 A CN 106101936A CN 201610717137 A CN201610717137 A CN 201610717137A CN 106101936 A CN106101936 A CN 106101936A
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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
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Abstract
The invention provides a kind of audio amplification device based on music maximum level, method and terminal, including application processor: for reading the metadata information of audio file, the peak value of the playback gain of this audio file is extracted, for determining target volume according to the playback gain peak value of music and controlling the output voltage of DC source from described metadata information；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；Thus reduce power consumption.
Description
Technical field
The present embodiments relate to audio frequency amplifier voltage adjusting method, particularly relate to a kind of based on music maximum level
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.
Above characteristic, is essentially all unstable state impact, only relies on single steady-state sine ripple and carries out testing and may test
The most out, therefore index still may can test the highest numerical value, but actually sense of hearing can be deteriorated.
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 based on music maximum level, including:
Application processor: for reading the metadata information of audio file, extract this audio frequency from described metadata information
The peak value of the playback gain of file, determines target volume according to the playback gain peak value of music and controls the output of DC source
Voltage；
DC source, for powering 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 target volume is music current volume and described playback gain peak value sum.
Preferably, 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.
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 arbitrary described audio amplification device in above-mentioned.
The present invention also provides for a kind of audio amplification device based on music maximum level, including:
Application processor: for reading the metadata information of audio file, extract this audio frequency from described metadata information
The peak value of the playback gain of file, determines target volume according to the playback gain peak value of music and controls the output of DC source
Voltage；
DC source, for powering 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 target volume is music current volume and described playback gain peak value sum.
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 arbitrary described audio amplification device in above-mentioned.
The present invention provides a kind of audio amplification method based on music maximum level, including:
S100 is a preset volume and audio frequency amplifier voltage mapping table in application processor；
S101 reads the metadata information of audio file, and the playback extracting this audio file from described metadata information increases
The peak value of benefit, determines target volume and by the output electricity of bus marco DC source according to the playback gain peak value of music
Pressure；
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, in described S101, described target volume is music current volume and described playback gain peak value sum.
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 reads the metadata information of audio file, playback gain peak value of sampling, and calculates target volume, and using should
Play out with processor, 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, is read the distortion of described 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 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 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 also provides for a kind of audio amplification method based on music maximum level, including:
S10 is a preset volume, audio frequency amplifier voltage and digital regulation resistance resistance mapping table in application processor；
S11 reads the metadata information of audio file, and the playback extracting this audio file from described metadata information increases
The peak value of benefit, determines target volume according to the playback gain peak value of music and regulates the defeated of DC source by digital regulation resistance
Go out voltage；
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.
20, audio amplification method according to claim 19, it is characterised in that in described S101, described target sound
Amount is music current volume and described playback gain peak value sum.
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 and audio frequency amplifier voltage mapping table and is
S1101 reads the metadata information of audio file, playback gain peak value of sampling, and calculates target volume, and using should
Play out with processor, 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, is read the distortion of described 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 1dB by S1104, and the resistance continuing adjustment digital regulation resistance turns down the output voltage of DC source, directly
The distortion tested to audio frequency amplifier starts to become big, continues the voltage by DC source exports and recorded audio frequency corresponding to-1dB
In amplifier magnitude of voltage and digital regulation resistance resistance；
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 audio file sound intermediate frequency amplitude schematic diagram of the present invention；
Fig. 4 is a kind of audio amplification device schematic diagram of the present invention；
Fig. 5 is the another kind of audio amplification device schematic diagram of the present invention；
Fig. 6 is a kind of audio amplification method schematic diagram of the present invention；
Fig. 7 is the another kind of audio amplification method schematic diagram of the present invention；
Fig. 8 is volume of the present invention and audio frequency amplifier voltage mapping table method for building up schematic flow sheet；
Fig. 9 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；
Figure 10 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.
The audio file sound intermediate frequency amplitude schematic diagram of the present invention as shown in Figure 3, owing to the playback level of music has some poor
Different, have is larger, and have is smaller, as shown in Figure 3 the difference of two songs, is specially audio frequency during song switches
The voltage of amplifier PA can change significantly.Therefore, there is the difference of low and high level when of in view of music playback, therefore the present invention
Regulate the supply voltage size of audio frequency amplifier PA according to music playback level, allow audio frequency amplifier PA be operated in performance
With under power consumption optimum state, reduce power consumption；High level is played back with high voltage, meets the maximum output of audio frequency, for
Low level music, with lower voltage, in the case of meeting the various performance of music, reduces power consumption.Specifically, the present invention passes through
Application processor reads the metadata information of audio file, extracts the playback gain of this audio file from described metadata information
Peak value, determine target volume according to the playback gain peak value of music and control the output voltage of DC source, i.e. audio frequency and put
The voltage of big device PA.Skilled person will appreciate that, it is corresponding that the peak value of described playback gain is Fig. 3 sound intermediate frequency Amplitude maxima
Playback gain value.
As shown in Figure 4, a kind of audio amplification device schematic diagram of the present invention, including application processor: be used for reading audio frequency
The metadata information of file, extracts the peak value of the playback gain of this audio file, according to music from described metadata information
Playback gain peak value determines target volume and controls 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.In the present embodiment, described DC source supporting bus pressure regulation.Wherein, described bus
Can be I2C bus or other there is the bus of voltage regulation function, skilled person will appreciate that, I2C bus is an act
Example, is not intended as the restriction of the present invention.Further, in the present embodiment, by directly being controlled direct current by volume control module
The voltage of power supply exports rather than is controlled the voltage of DC source by digital to analog converter (DAC), thus makes audio frequency amplify
The process of device PA pressure regulation does not affect output tonequality.
Further, described target volume is music current volume and described playback gain peak value sum.It is exemplified below: when
Front volume is set to-2dB, and playback gain peak value is-3dB, then calculation is exactly-2dB+-3dB=-5dB, by tabling look-up-
Audio frequency PA running voltage corresponding for 5dB is+-4.5V, and this voltage arranges this process that just completes on audio frequency PA.Described should
A preset volume and audio frequency amplifier voltage mapping table is also included, for when user regulates volume, according to described with processor
Volume and audio frequency amplifier voltage mapping table regulate the voltage of audio frequency amplifier.
As it is shown in figure 5, 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 reading the metadata information of audio file, from described metadata information, extract this audio file
The peak value of playback gain, determines target volume according to the playback gain peak value of music and controls 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 amplifies
Device, for amplifying the audio signal received from described digital to analog converter and exporting；Digital regulation resistance, as shown in Figure 10, uses
The voltage of described DC source is regulated in the resistance by regulating described digital regulation resistance.Further, described application processes
Device also includes a preset volume, audio frequency amplifier voltage and digital regulation resistance resistance mapping table, is used for when user regulates volume,
Audio frequency amplifier is regulated with audio frequency amplifier voltage mapping table by regulation digital regulation resistance resistance according to described volume
Voltage.
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 6, including: S100 in application processor preset one
Individual volume and audio frequency amplifier voltage mapping table；S101 reads the metadata information of audio file, from described metadata information
Extract the peak value of the playback gain of this audio file, determine target volume according to the playback gain peak value of music and pass through bus
Control the output voltage of DC source；S102 digital to analog converter output audio signal is to audio frequency amplifier；Unidirectional current described in S103
Source drives the work of described audio frequency amplifier；The audio signal that audio frequency amplifier described in S104 will receive from described digital to analog converter
Amplify and export.Further, described S101 also includes that user regulates volume and by the output of the linear manostat of bus marco
Voltage, for reducing the impact on audio frequency amplifier of the DC source output noise.Preferably, the output voltage of described DC source
Output voltage more than described linear voltage regulator.It is further preferred that described S101 also includes: when user changes volume
Waiting, the volume control module in application processor can check the output data of digital to analog converter, when finding zero crossing, adjusts rapidly
Joint volume controls, and carries out audio frequency amplifier Control of Voltage according to preset volume and audio frequency amplifier voltage mapping table.
As shown in Figure 8, 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 the step of volume and audio frequency amplifier voltage mapping table: S1001 reads the metadata information of audio file,
Sampling playback gain peak value, and calculate target volume, use application processor to play out, audio frequency output is connected to audio frequency and puts
Big device；The voltage of audio frequency amplifier is set to DC power output voltage maximum by S1002, and it is defeated to be set to max volume
Go out, audio analyzer read the distortion of described audio frequency amplifier output；S1003 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 record in the table；S1004 will
Volume reduces 0.5～1dB, continues to turn down the output voltage of DC source, until the distortion that audio frequency amplifier is tested starts to become
Greatly, continue the voltage by DC source exports to recorded in 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 is all recorded complete, for volume control
Molding block calls.
| 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
Max volume output during 0dB is S1002 in table 1.1, continues to reduce volume, by looking on the basis of this volume
Table obtains the running voltage of audio frequency PA.Skilled person will appreciate that, table 1.1 is only an example of the present invention, is not
Limitation of the present invention.Those skilled in the art can be worked by non-creativeness and arbitrarily change form according to practical situation.
The another kind of audio amplification method schematic diagram of the present invention as shown in Figure 7；Including: S10 in application processor preset
One volume, audio frequency amplifier voltage and digital regulation resistance resistance mapping table；S11 reads the metadata information of audio file, from
Described metadata information extracts the peak value of the playback gain of this audio file, determines mesh according to the playback gain peak value of music
Mark with phonetic symbols amount 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；Audio frequency amplifier described in S14 will turn from described digital-to-analogue
The audio signal that parallel operation receives is amplified and exports.Further, described S11 also includes that user regulates volume and by numeral electricity
The output voltage of position device linear adjustment manostat, for reducing the impact on audio frequency amplifier of the DC source output noise.Described
The output voltage of DC source is more than the output voltage of described linear voltage regulator.It is further preferred that described S11 also includes: when
The when that user changing volume, the volume control module in application processor can check the output data of digital to analog converter, when sending out
During existing zero crossing, regulation volume controls rapidly, and reflects according to preset volume, audio frequency amplifier voltage and digital regulation resistance resistance
Firing table carries out audio frequency amplifier Control of Voltage.
As it is shown in figure 9, 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 reads the metadata information of audio file, playback gain peak value of sampling, and calculates target volume, use and answer use
Reason device plays out, and audio frequency output is connected to audio frequency amplifier；The voltage of audio frequency amplifier is set to DC source by S1102
Output voltage maximum, and be set to max volume output, audio analyzer read the distortion of described audio frequency amplifier output；
S1103 adjusts the resistance of digital regulation resistance, is gradually reduced the output voltage of DC source, until the mistake that audio frequency amplifier is tested
Really start to become big, by corresponding audio frequency amplifier voltage and digital regulation resistance resistance record in the table；Volume is reduced by S1104
0.5～1dB, the resistance continuing adjustment digital regulation resistance turns down the output voltage of DC source, until audio frequency amplifier is tested
Distortion start to become big, continue the voltage by DC source exports and recorded audio frequency amplifier magnitude of voltage corresponding for-1dB and numeral
In potentiometer resistance；S1105 repeats S1104, until the maximum attenuation amount that volume controls, DC source corresponding for all volumes
Output voltage and digital regulation resistance resistance all record complete, call for volume control module.
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 7, 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 (24)
1. an audio amplification device based on music maximum level, it is characterised in that including:
Application processor: for reading the metadata information of audio file, extract this audio file from described metadata information
The peak value of playback gain, determine target volume according to the playback gain peak value of music and control the output electricity of DC source
Pressure；
DC source, for powering 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 target volume be music current volume with
Described playback gain peak value sum.
Audio amplification device the most according to claim 1, it is characterised in that described application processor also includes that one is preset
Volume and audio frequency amplifier voltage mapping table, for when user regulates volume, according to described volume and audio frequency amplifier voltage
Mapping 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 4, it is characterised in that the output voltage of described DC source is more than institute
State the output voltage of linear voltage regulator.
6. an audio amplification device based on music maximum level, it is characterised in that including:
Application processor: for reading the metadata information of audio file, extract this audio file from described metadata information
The peak value of playback gain, for determining target volume according to the playback gain peak value of music and controlling the output of DC source
Voltage；
DC source, for powering 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 6, it is characterised in that described target volume be music current volume with
Described playback gain peak value sum.
Audio amplification device the most according to claim 6, 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 6, 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 9, it is characterised in that the output voltage of described DC source is more than
The output voltage of described linear voltage regulator.
11. 1 kinds of terminals, it is characterised in that include an arbitrary described audio amplification device in Claims 1 to 5.
12. 1 kinds of terminals, it is characterised in that include an arbitrary described audio amplification device in claim 6～10.
13. 1 kinds of audio amplification method based on music maximum level, it is characterised in that including:
S100 is a preset volume and audio frequency amplifier voltage mapping table in application processor；
S101 reads the metadata information of audio file, extracts the playback gain of this audio file from described metadata information
Peak value, determines target volume and by the output voltage of bus marco DC source according to the playback gain peak value of music；
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.
14. audio amplification method according to claim 13, it is characterised in that in described S101, described target volume is
Music current volume and described playback gain peak value sum.
15. audio amplification method according to claim 13, 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.
16. audio amplification method according to claim 15, it is characterised in that the output voltage of described DC source is more than
The output voltage of described linear voltage regulator.
17. audio amplification method according to claim 13, it is characterised in that described S100 sets up volume and amplifies with audio frequency
The step of device voltage mapping table is
S1001 reads the metadata information of audio file, playback gain peak-peak of sampling, and calculates target volume, and using should
Play out with processor, 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 described 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 in 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.
18. audio amplification method according to claim 13, 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.
19. 1 kinds of audio amplification method based on music maximum level, 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 is for reading the metadata information of audio file, and the playback extracting this audio file from described metadata information increases
The peak value of benefit, determines target volume according to the playback gain peak value of music and regulates the defeated of DC source by digital regulation resistance
Go out voltage；
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.
20. audio amplification method according to claim 19, it is characterised in that in described S101, described target volume is
Music current volume and described playback gain peak value sum.
21. audio amplification method according to claim 19, 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.
22. audio amplification method according to claim 21, it is characterised in that the output voltage of described DC source is more than
The output voltage of described linear voltage regulator.
23. audio amplification method according to claim 19, it is characterised in that described S10 sets up volume and amplifies with audio frequency
The step of device voltage mapping table is
S1101 reads the metadata information of audio file, the peak value of sampling playback gain peak value, and calculates target volume, uses
Application processor plays 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 described 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 0.5～1dB by S1104, and the resistance continuing adjustment digital regulation resistance turns down the output voltage of DC source, directly
The distortion tested to audio frequency amplifier starts to become big, continues the voltage by DC source exports and recorded audio frequency corresponding to-1dB
In amplifier 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.
24. audio amplification method according to claim 19, 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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