CN104967945B - A kind of control method of earphone power amplifier and earphone power amplifier - Google Patents
A kind of control method of earphone power amplifier and earphone power amplifier Download PDFInfo
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- CN104967945B CN104967945B CN201510300753.9A CN201510300753A CN104967945B CN 104967945 B CN104967945 B CN 104967945B CN 201510300753 A CN201510300753 A CN 201510300753A CN 104967945 B CN104967945 B CN 104967945B
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Abstract
The embodiment of the invention discloses the control methods of a kind of earphone power amplifier and earphone power amplifier, the earphone power amplifier includes: usb interface module, digital tone source decoding chip is conveyed to for accessing external digital sound source signal, and by external digital sound source signal；Analog audio signal for digital tone source signal to be converted to analog audio signal, and is conveyed to power amplifier module and amplifies and export by digital tone source decoding chip；Main control chip, for controlling whether audio signal detection module real-time detection power amplifier module has analog audio signal output, if it is not, then closing power amplifier module.Using the present invention, solve the problems, such as that earphone power amplifier electricity wastes larger in the prior art.
Description
Technical field
The present invention relates to field of computer technology more particularly to a kind of earphone power amplifiers and earphone power amplifier
Control method.
Background technique
In recent years, electronic technology development is swift and violent, greatly improves people's lives quality, and earphone power amplifier is one
The digital audio and video signals of high-fidelity are converted to the experience type electronic product of analog audio signal by money, pass through earphone power amplifier
The music of available higher quality greatly meets the demand of the music public, and therefore, earphone power amplifier is
Through becoming many music-lover's essential products.
However, there is electricity waste in earphone power amplifier, as electric terminal, especially mobile terminal mostly
For, electricity waste can seriously affect user experience.
Summary of the invention
The embodiment of the invention discloses the control methods of a kind of earphone power amplifier and earphone power amplifier, can solve
Electricity wastes larger problem when certainly earphone power amplifier works in the prior art.
In a first aspect, the embodiment of the present invention provides a kind of earphone power amplifier, which includes master control
Chip, digital tone source decoding chip, usb interface module, power amplifier module and audio signal detection module, the digital tone source
Decoding chip, power amplifier module and audio signal detection module are separately connected the main control chip, the usb interface module and
The power amplifier module is separately connected the digital tone source decoding chip, wherein
The usb interface module is conveyed for accessing external digital sound source signal, and by the external digital sound source signal
To the digital tone source decoding chip；
The digital tone source decoding chip is used to be converted to the digital tone source signal analog audio signal, and will be described
Analog audio signal is conveyed to the power amplifier module；
The power amplifier module is for amplifying and exporting the analog audio signal received；
Whether the main control chip is for controlling power amplifier module described in the audio signal detection module real-time detection
There is analog audio signal output, if it is not, then disconnecting the power supply to the power amplifier module.
With reference to first aspect, in the first possible implementation of the first aspect, the main control chip is disconnected to institute
The power supply for stating power amplifier module includes: that the main control chip is disconnected to the power amplifier module and digital tone source decoding
The power supply of chip.
The possible implementation of with reference to first aspect the first, in second of possible implementation of first aspect
In, after the main control chip is disconnected to the power supply of the power amplifier module and the digital tone source decoding chip, automatically power off.
The possible implementation of with reference to first aspect the first, in second of possible implementation of first aspect
In, the main control chip disconnects the concrete mode of the power supply to the power amplifier module and the digital tone source decoding chip
Are as follows:
The main control chip automatically powers off, wherein the electricity of the power amplifier module and the digital tone source decoding chip
Amount is provided by the main control chip.
The possible implementation of with reference to first aspect the first, in the 4th kind of possible implementation of first aspect
In, after the main control chip is disconnected to the power supply of the power amplifier module and the digital tone source decoding chip, it is also used to control
Make whether power amplifier module described in the audio signal detection module real-time detection has tone frequency channel wire access, if so, recovery pair
The power supply of the digital tone source decoding chip and the power amplifier module.
Second aspect, a kind of control method of earphone power amplifier provided in an embodiment of the present invention, this method comprises:
Whether main control chip control audio signal detection module real-time detection power amplifier module has analog audio signal defeated
Out, wherein the analog audio signal is that after usb interface module accesses external digital sound source signal, the digital tone source is believed
Number it is conveyed to what digital tone source decoding chip was decoded；
When testing result is no, the main control chip disconnects the power supply to the power amplifier module.
In conjunction with second aspect, in the first possible implementation of the second aspect, the main control chip is disconnected to institute
State the power supply of power amplifier module, comprising:
The main control chip disconnects the power supply to the power amplifier module and the digital tone source decoding chip.
In conjunction with the first possible implementation of second aspect, in second of possible implementation of second aspect
In, after the main control chip is disconnected to the power supply of the power amplifier module and the digital tone source decoding chip, the method
Further include:
The main control chip automatically powers off.
In conjunction with the first possible implementation of second aspect, in the third possible implementation of second aspect
In, the main control chip disconnects the concrete mode of the power supply to the power amplifier module and the digital tone source decoding chip
Are as follows:
The main control chip automatically powers off, wherein the electricity of the power amplifier module and the digital tone source decoding chip
Amount is provided by the main control chip.
In conjunction with the first possible implementation of second aspect, in the 4th kind of possible implementation of second aspect
In, after the main control chip is disconnected to the power supply of the power amplifier module and the digital tone source decoding chip, further includes:
The main control chip controls whether power amplifier module described in the audio signal detection module real-time detection has sound
The access of frequency line；
If so, the main control chip restores the confession to the digital tone source decoding chip and the power amplifier module
Electricity.
By implementing the embodiment of the present invention, whether there is simulation at the signal output interface of real-time detection earphone power amplifier
Audio signal output, if closing power amplifier module sum number word tone source signal decoding chip without if, to reach saving electricity
Purpose.
After power amplifier module sum number word tone source signal decoding core is closed, pass through signal detection module real time detection signal
Whether there is tone frequency channel wire access at output interface, if so, then automatically turning on power amplifier module sum number word tone source signal decoding core, mentions
User experience is risen；Main control chip in power amplifier is closing power amplifier module sum number word tone source signal decoding core
Afterwards, itself power-off is returned, electricity is further saved.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of earphone power amplifier provided in an embodiment of the present invention；
Fig. 2 is a kind of flow diagram of the control method of earphone power amplifier provided in an embodiment of the present invention；
Fig. 3 is the flow diagram of the control method of another earphone power amplifier provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It should be noted that the term used in embodiments of the present invention is only merely for the mesh of description specific embodiment
, it is not intended to limit the invention." the one of the embodiment of the present invention and singular used in the attached claims
Kind ", " described " and "the" are also intended to including most forms, unless the context clearly indicates other meaning.It is also understood that this
Term "and/or" used herein refers to and includes one or more associated any or all possible group for listing project
It closes.In addition, term " includes " and " having " and their any deformations, it is intended that cover and non-exclusive include.Such as comprising
A series of steps or units is not limited to listed step or unit, but optionally further comprising the step of not listing
Or unit.
Digital tone source signal described in the embodiment of the present invention refers to the digital signal of characterization sound, under normal conditions with number
The sound fidelity effect with higher that the form of word signal saves；Analog audio signal described in the embodiment of the present invention refers to
Characterize the analog signal of sound.
Referring to Figure 1, Fig. 1 is a kind of structural schematic diagram of earphone power amplifier provided in an embodiment of the present invention, in Fig. 1
Earphone power amplifier 10 may include: main control chip 101, digital tone source decoding chip 102, usb interface module 103, function
Rate amplification module 104, audio signal detection module 105, power supply module 106.
Digital tone source decoding chip 102, power amplifier module 104, audio signal detection module 105 and power supply module 106
It is connected respectively on each pin of main control chip 101.
Usb interface module 103 and power amplifier module 104 are separately connected digital tone source decoding chip 102, wherein USB connects
Mouth mold block 103 is used to input digital tone source signal to digital tone source decoding chip 102, and power amplifier module 104 is for accessing number
PCM, DSD, analog signal that digital tone source signal is decoded by word source of sound decoding chip 102 etc., it is preferred that the present invention
All embodiments be unfolded to describe for decoding obtained signal and be analog audio signal.
Specifically, usb interface module 103 is connected with external sound source equipment (mobile phone, computer etc.) by data line, therefore
Usb interface module 103 can access external digital sound source signal, wherein the interface that usb interface module is connected with data line can
To be standard USB port, it is also possible to Micro USB port.After usb interface module 103 has accessed external digital sound source signal, by this
Signal is transferred to digital tone source decoding chip 102, so that the digital tone source decoding chip 102 handles digital tone source signal
Obtain analog audio signal, wherein digital tone source decoding chip 102 can be a codec chip CS4218 (tool in other words
Have the integrated circuit modules for converting digital signals into analog signal), digital tone source decoding chip 102 is needed according to power amplification
The actual parameter of device selects, therefore the unlimited concrete model for determining digital tone source decoding chip 102 herein.
Further, analog audio signal is transferred to power amplifier module 104 by digital tone source decoding chip 102, so that
The analog audio signal is amplified and is exported by power amplifier module 104, wherein the power amplifier module of power amplifier module
Power amplification principle can be with analogy A class, B class, AB class, the power amplification principle of D class constant power amplifier, herein not to power
The principle of amplification module is restricted.
Earphone power amplifier 10 can execute following steps under conventional operating mode: access from usb interface module 103
The digital tone source signal is transferred to digital tone source decoding chip 102, to digital tone source decoding chip 102 by digital tone source signal
After digital tone source signal is converted to analog signal, analog signal transmission to power amplifier module 104 is further subjected to power
Amplification, with obtain can be by the analog signal of the device plays sounding such as earphone, sound equipment.
Further, audio signal detection module 105 is connected with power amplifier module 104, is used for real-time detection power
Whether the analog signal output of amplification module 104 has analog audio signal output, and will test result and feed back to and be attached thereto
The main control chip 101 connect is held after main control chip 101 receives the result of the feedback of audio signal detection module 105 according to the result
Row correlation step, specifically, when the output end of the result characterization power amplifier module 104 of feedback does not have analog audio signal output
When, the power supply to power amplifier module 104 is interrupted, so that power amplifier module 104 stops working.
It should be noted that main control chip 101 can be 51 chips, STM32 chip, MUC chip etc., herein not to master control
Chip is restricted, but Preferable scheme is that using MCU chip as main control chip.Modules (including chip) power supply (if
Need to power) all provided by power supply module 106, but by the control of main control chip 101, i.e., modules can connect electricity work by
Main control chip 101 is determined according to the parameter got.In addition, audio signal detection module 105 is made of circuit, the circuit and master
Control chip 101 combine, main control chip 101 execute detection program can be detected power amplifier module 104 output end whether
There is analog audio signal output.
In a kind of optional scheme, when the main control chip 101 closes the power amplifier module 104, it is also turn off institute
State digital tone source decoding chip 102.
Specifically, after main control chip 101 receives the result of the feedback of audio signal detection module 105, according to the result
Correlation step is executed, specifically, when the output end of the result characterization power amplifier module 104 of feedback does not have analog audio signal defeated
When out, the power supply to digital tone source decoding chip 102 and power amplifier module 104 is interrupted, so that digital tone source decoding chip 102
It stops working with power amplifier module 104；When the output end of the result characterization power amplifier module 104 of feedback has analogue audio frequency letter
When number output, control digital tone source decoding chip 102, which executes, is converted to digital tone source signal the operation of analog audio signal, together
When control power amplifier module 104 analog audio signal is amplified to obtain to play out by stereo set etc.
Audio signal.In addition, main control chip 101 closes the sequencing of power amplifier module 104 and digital tone source decoding chip 102
Herein with no restriction.
Further, in another optional scheme, the main control chip 101 is closing the digital tone source decoding core
After piece 102 and the power amplifier module 104, power amplification described in 105 real-time detection of audio signal detection module is controlled
Whether the output end of module 104 has tone frequency channel wire access, if so, restoring to the digital tone source decoding chip 102 and the function
The power supply of rate amplification module 104.
Specifically, after digital tone source decoding chip 102 and power amplifier module 104 are powered down, main control chip 101 can also
Whether the output end of control 105 real-time detection power amplifier module 104 of audio signal detection module has tone frequency channel wire access, if so,
It is then powered on again to digital tone source decoding chip 102 and power amplifier module 104, to start 102 He of digital tone source decoding chip
Power amplifier module 104 is allowed to work, it should be noted that in earphone power amplifier, earphone power amplifier is caused not have
Have the reason of analog audio signal output to include at least following two: 1, power amplifier module itself is without analog audio signal；
2, power amplifier module has analog audio signal, but not external tone frequency channel wire is connected with the power amplifier module, so that
Power amplifier module does not have analog audio signal output.
In yet another alternative, main control chip 101 is executing closing digital tone source decoding chip 102 and power amplification mould
After the operation of block 105, automatically power off.
Specifically, when audio signal detection module 105 detects that the output end of power amplifier module 104 does not have analogue audio frequency
When signal exports, feedback signal can be sent to main control chip 101, which closes number in addition to triggering main control chip 101
Outside source of sound decoding chip 102 and power amplifier module 105, it is also used to trigger main control chip 101 and automatically powers off.
In another optional scheme, main control chip 101 is disconnected to power amplifier module 104 and digital tone source decoding chip
The concrete mode of 102 power supply are as follows: main control chip 101 automatically powers off, wherein power amplifier module 104 and digital tone source decoding
The electricity of chip 102 is provided by main control chip 101.
Specifically, the electricity of modules is all provided by main control chip 101 in earphone power amplifier 10, when master control core
After 101 automatically power off, just all the electricity went off naturally for the modules in earphone power amplifier 10, including power amplifier module
104 and digital tone source decoding chip 102.Make the power-off of main control chip 101 that can also further save electricity.
Still further, chip, which is automatically powered off, has wide application in this field, for example, the timing shutdown of mobile phone,
Automatic shutdown etc. after mobile power source is fully charged, the chip in the embodiment of the present invention, which automatically powers off, to be come specifically with the analogy prior art
It realizes, details are not described herein again.
Referring to figure 2., Fig. 2 is that a kind of process of the control method of earphone power amplifier provided in an embodiment of the present invention is shown
It is intended to, wherein each step is described in detail as follows.
Step S201: whether main control chip control audio signal detection module real-time detection power amplifier module has analog audio
Frequency signal output, wherein analog audio signal is that after usb interface module accesses external digital sound source signal, digital tone source is believed
Number it is conveyed to what digital tone source decoding chip was decoded.
Specifically, usb interface module is connected with external sound source equipment (mobile phone, computer etc.) by data line, therefore USB
Interface module can access external digital sound source signal, wherein the interface that usb interface module is connected with data line can be mark
Quasi- USB port is also possible to Micro USB port.After usb interface module has accessed external digital sound source signal, which is transmitted
Digital tone source decoding chip is given, so that the digital tone source decoding chip is handled digital tone source signal to obtain analogue audio frequency letter
Number, wherein digital tone source decoding chip can be codec chip CS4218 (in other words one have convert digital signals into
The integrated circuit modules of analog signal), digital tone source decoding chip needs are selected according to the actual parameter of power amplifier, because
This unlimited concrete model for determining digital tone source decoding chip herein.
Further, analog audio signal is transferred to power amplifier module by digital tone source decoding chip, so that power is put
The analog audio signal is amplified and is exported by big module, wherein the power of the power amplifier module of power amplifier module is put
Big principle can be with analogy A class, B class, AB class, the power amplification principle of D class constant power amplifier, herein not to power amplifier module
Principle be restricted.
Earphone power amplifier can execute following steps under conventional operating mode: access number from usb interface module
The digital tone source signal is transferred to digital tone source decoding chip by sound source signal, to digital tone source decoding chip by digital tone source
After signal is converted to analog signal, analog signal transmission to power amplifier module is further subjected to power amplification, to obtain energy
Enough pass through the analog signal of the device plays sounding such as earphone, sound equipment.
Further, audio signal detection module is connected with power amplifier module, is used for real-time detection power amplification mould
Whether the analog signal output of block has analog audio signal output, and will test result and feed back to connected master control core
Piece after main control chip receives the result of audio signal detection module feedback, executes correlation step according to the result, specifically,
When the output end of the result of feedback characterization power amplifier module does not have analog audio signal output, interrupt to power amplifier module
Power supply so that power amplifier module stops working.
It should be noted that main control chip can be 51 chips, STM32 chip, MUC chip etc., herein not to master control core
Piece is restricted, but Preferable scheme is that using MCU chip as main control chip.The power supply of modules (including chip) is (if needed
Power) all provided by power supply module, but by the control of main control chip, i.e. can modules connect electricity work by main control chip
It is determined according to the parameter got.In addition, audio signal detection module is made of circuit, which combines with main control chip,
Main control chip executes whether the output end that detection program can be detected power amplifier module has analog audio signal output.
Step S202: when testing result is no, main control chip disconnects the power supply to power amplifier module.
Specifically, when audio signal detection module detects that power amplifier module does not have analog audio signal output, master control
Chip disconnects the power supply to power amplifier module.
It should be noted that, there are many functional modules, these functional modules are all largely in earphone power amplifier
Controlled by main control chip, when main control chip control be disconnected the power supply of power amplifier module after, it is also an option that property break
The power supply to some other functional module (such as digital tone source decoding chip) is opened, specifically also to be disconnected to which functional module
It powers herein with no restrictions.
Further, when main control chip detects the output of no analog audio signal, it can be to disconnect at once and power put
The power supply of big module disconnects the power supply to power amplifier module, certainly, the time of delay again after a period of time that is also possible to be delayed
It can preset, herein with no restriction.
In a kind of optional scheme, when the main control chip closes the power amplifier module, it is also turn off the number
Source of sound decoding chip.
Specifically, after main control chip receives the result of audio signal detection module feedback, phase is executed according to the result
Step is closed, specifically, when the output end of the result of feedback characterization power amplifier module does not have analog audio signal output, is interrupted
Power supply to digital tone source decoding chip and power amplifier module, so that digital tone source decoding chip and power amplifier module stop
Work.When the output end of the result of feedback characterization power amplifier module 104 has analog audio signal output, digital tone source is controlled
Decoding chip 102 executes the operation that digital tone source signal is converted to analog audio signal, while controlling power amplifier module 104
The analog audio signal is amplified to obtain the audio signal that can be played out by stereo set etc..In addition, master control
Chip closes the sequencing of power amplifier module and digital tone source decoding chip herein with no restriction.
Further, in another optional scheme, main control chip is executing closing digital tone source decoding chip and function
After the operation of rate amplification module, automatically power off.
Specifically, when audio signal detection module detects that the output end of power amplifier module does not have analog audio signal defeated
When out, feedback signal can be sent to main control chip, which closes digital tone source decoding chip in addition to triggering main control chip
Outside power amplifier module, it is also used to trigger main control chip and automatically powers off.
In another optional scheme, main control chip disconnects the power supply to power amplifier module and digital tone source decoding chip
Concrete mode are as follows: main control chip automatically powers off, wherein the electricity of power amplifier module and digital tone source decoding chip is by master control
Chip provides.
Specifically, the electricity of modules is all provided by main control chip in earphone power amplifier, when main control chip from
After dynamic circuit breaker electricity, just all the electricity went off naturally for the modules in earphone power amplifier, including 104 sum number word tone of power amplifier module
Source decoding chip.Make main control chip power-off that can also further save electricity.
Still further, chip, which is automatically powered off, has wide application in this field, for example, the timing shutdown of mobile phone,
Automatic shutdown etc. after mobile power source is fully charged, the chip in the embodiment of the present invention, which automatically powers off, to be come specifically with the analogy prior art
It realizes, details are not described herein again.
Referring to figure 3., Fig. 3 is the process of the control method of another earphone power amplifier provided in an embodiment of the present invention
Schematic diagram, wherein each step is described in detail as follows.
Step S301: whether main control chip control audio signal detection module real-time detection power amplifier module has analog audio
Frequency signal output, wherein analog audio signal is that after usb interface module accesses external digital sound source signal, digital tone source is believed
Number it is conveyed to what digital tone source decoding chip was decoded.
Specifically, usb interface module is connected with external sound source equipment (mobile phone, computer etc.) by data line, therefore USB
Interface module can access external digital sound source signal, wherein the interface that usb interface module is connected with data line can be mark
Quasi- USB port is also possible to Micro USB port.After usb interface module has accessed external digital sound source signal, which is transmitted
Digital tone source decoding chip is given, so that the digital tone source decoding chip is handled digital tone source signal to obtain analogue audio frequency letter
Number, wherein digital tone source decoding chip can be codec chip CS4218 (in other words one have convert digital signals into
The integrated circuit modules of analog signal), digital tone source decoding chip needs are selected according to the actual parameter of power amplifier, because
This unlimited concrete model for determining digital tone source decoding chip herein.
Further, analog audio signal is transferred to power amplifier module by digital tone source decoding chip, so that power is put
The analog audio signal is amplified and is exported by big module, wherein the power of the power amplifier module of power amplifier module is put
Big principle can be with analogy A class, B class, AB class, the power amplification principle of D class constant power amplifier, herein not to power amplifier module
Principle be restricted.
Earphone power amplifier can execute following steps under conventional operating mode: access number from usb interface module
The digital tone source signal is transferred to digital tone source decoding chip by sound source signal, to digital tone source decoding chip by digital tone source
After signal is converted to analog signal, analog signal transmission to power amplifier module is further subjected to power amplification, to obtain energy
Enough pass through the analog signal of the device plays sounding such as earphone, sound equipment.
Further, audio signal detection module is connected with power amplifier module, is used for real-time detection power amplification mould
Whether the analog signal output of block has analog audio signal output, and will test result and feed back to connected master control core
Piece after main control chip receives the result of audio signal detection module feedback, executes correlation step according to the result, specifically,
When the output end of the result of feedback characterization power amplifier module does not have analog audio signal output, interrupt to power amplifier module
Power supply so that power amplifier module stops working.It should be noted that causing earphone power in earphone power amplifier
Amplifier does not have the reason of analog audio signal output to include at least following two: 1, power amplifier module itself is without analog audio
Frequency signal；2, power amplifier module has analog audio signal, but not external tone frequency channel wire is connected with the power amplifier module
It connects, so that power amplifier module does not have analog audio signal output.
It should be noted that main control chip can be 51 chips, STM32 chip, MUC chip etc., herein not to master control core
Piece is restricted, but Preferable scheme is that using MCU chip as main control chip.The power supply of modules (including chip) is (if needed
Power) all provided by power supply module, but by the control of main control chip, i.e. can modules connect electricity work by main control chip
It is determined according to the parameter got.In addition, audio signal detection module is made of circuit, which combines with main control chip,
Main control chip executes whether the output end that detection program can be detected power amplifier module has analog audio signal output.
Step S302: when testing result is no, main control chip is disconnected to power amplifier module and digital tone source interface core
The power supply of piece.
Specifically, when audio signal detection module detects that power amplifier module does not have analog audio signal output, master control
Chip disconnects the power supply to power amplifier module and digital tone source decoding chip.
It should be noted that, there are many functional modules, these functional modules are all largely in earphone power amplifier
Controlled by main control chip, when main control chip control be disconnected the power supply of power amplifier module after, it is also an option that property break
The power supply to some other functional module (such as digital tone source decoding chip) is opened, specifically also to be disconnected to which functional module
Power supply herein with no restrictions, but in the present solution, having to be off the power supply to power amplifier module and digital tone source decoding chip.
Further, when main control chip detects the output of no analog audio signal, it can be to disconnect at once and power put
The power supply of big module and digital tone source decoding chip disconnects the confession to power amplifier module again after a period of time that is also possible to be delayed
The power supply of electricity and digital tone source decoding chip, certainly, the time of delay can preset, herein with no restriction.
Still further, after main control chip is disconnected to the power supply of power amplifier module and digital tone source decoding chip, itself
Working condition is also kept, other modules is still can control and one is done to the operation of power amplifier module and digital tone source decoding chip
A little preparations.
Step S303: whether main control chip control audio signal detection module real-time detection power amplifier module has tone frequency channel wire
Access.
Specifically, after main control chip is disconnected to the power supply of power amplifier module and the power supply of digital tone source decoding chip, also
Control audio signal detection module be will continue to have detected whether that tone frequency channel wire is linked into power amplifier module, the result of detection will be made
The trigger condition of operation is executed for main control chip.Under normal conditions, the mode for accessing tone frequency channel wire is to the pre- of power amplifier module
If interface is inserted into audio frequency cable joint, such as headset plug is inserted into the earphone jack on earphone power amplifier.
Step S304: if so, main control chip restores the power supply to digital tone source decoding chip and power amplifier module.
Specifically, when having detected tone frequency channel wire insertion, main control chip is put to digital tone source decoding chip and power again
Big module powers on, certainly, when previously having closed digital tone source decoding chip and power amplifier module, if also turning off other moulds
Block is also required to power on these modules at this time, so that earphone power amplifier is still played digital sound after inserting tone frequency channel wire
Source signal is converted to analog audio signal, and the effect that analog audio signal is amplified.
In conclusion by the implementation embodiment of the present invention, at the signal output interface of real-time detection earphone power amplifier
Whether analog audio signal output is had, if closing power amplifier module sum number word tone source signal decoding chip without if, to reach
To the purpose for saving electricity.
After power amplifier module sum number word tone source signal decoding core is closed, pass through signal detection module real time detection signal
Whether there is tone frequency channel wire access at output interface, if so, then automatically turning on power amplifier module sum number word tone source signal decoding core, mentions
User experience is risen；Main control chip in power amplifier is closing power amplifier module sum number word tone source signal decoding core
Afterwards, itself power-off is returned, electricity is further saved.
Above disclosed is only a preferred embodiment of the present invention, cannot limit the power of the present invention with this certainly
Sharp range, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and weighs according to the present invention
Benefit requires made equivalent variations, still belongs to the scope covered by the invention.
Claims (6)
1. a kind of earphone power amplifier, which is characterized in that including main control chip, digital tone source decoding chip, USB interface mould
Block, power amplifier module and audio signal detection module, the digital tone source decoding chip, power amplifier module and audio signal
Detection module is separately connected the main control chip, and the usb interface module and the power amplifier module are separately connected the number
Word source of sound decoding chip, wherein
The external digital sound source signal is conveyed to institute for accessing external digital sound source signal by the usb interface module
State digital tone source decoding chip, wherein the interface that usb interface module is connected with data line is standard USB port, either
Micro USB port；
The digital tone source decoding chip is used to the digital tone source signal being converted to analog audio signal, and by the simulation
Audio signal is conveyed to the power amplifier module；
The power amplifier module is for amplifying and exporting the analog audio signal received；
The main control chip is used to control the output end of power amplifier module described in the audio signal detection module real-time detection
Whether analog audio signal output is had, if it is not, the power supply to the power amplifier module is then disconnected, so that the power amplification mould
Block stops working；And for controlling the audio signal detection module after disconnecting to the power supply of the power amplifier module
Whether the output end of power amplifier module described in real-time detection has tone frequency channel wire access, if so, restoring to the power amplification mould
The power supply of block is allowed to work to start the power amplifier module.
2. earphone power amplifier according to claim 1, which is characterized in that the main control chip is also used in the function
The analog signal output of rate amplification module does not have to disconnect when analog audio signal output to the digital tone source decoding chip
Power supply.
3. earphone power amplifier according to claim 2, which is characterized in that the power amplifier module and the number
The electricity of source of sound decoding chip is provided by the main control chip.
4. a kind of control method of earphone power amplifier characterized by comprising
Whether the output end of main control chip control audio signal detection module real-time detection power amplifier module has analogue audio frequency letter
Number output, wherein the analog audio signal is after usb interface module accesses external digital sound source signal, by the digital sound
Source signal is conveyed to what digital tone source decoding chip was decoded, wherein what usb interface module was connected with data line connects
Mouth is standard USB port or Micro USB port；
When testing result is no, the main control chip disconnects the power supply to the power amplifier module, so that the power is put
Big module from service；And
Whether the output end for controlling power amplifier module described in the audio signal detection module real-time detection has tone frequency channel wire access,
If so, restoring the power supply to the power amplifier module, work is allowed to start the power amplifier module.
5. according to the method described in claim 4, it is characterized in that, the method also includes:
Main control chip disconnection when the analog signal output of the power amplifier module does not have analog audio signal output
Power supply to the digital tone source decoding chip.
6. according to the method described in claim 5, it is characterized in that, the power amplifier module and the digital tone source decode core
The electricity of piece is provided by the main control chip.
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| CN107333195A (en) * | 2016-04-29 | 2017-11-07 | 北京小米移动软件有限公司 | Conversion equipment and ear speaker device |
| CN212677349U (en) * | 2020-03-31 | 2021-03-09 | 易力声科技(深圳)有限公司 | Monitoring assembly, information processing assembly and earphone |
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| CN201426170Y (en) * | 2009-05-25 | 2010-03-17 | 南靖万利达科技有限公司 | Control circuit of loudspeaker capable of earphone-plug-in automatic mute |
| KR101567362B1 (en) * | 2009-06-09 | 2015-11-09 | 삼성전자주식회사 | Method and apparatus for ouputing audio signal in portable terminal |
| CN201518536U (en) * | 2009-09-14 | 2010-06-30 | 华为终端有限公司 | Audio control circuit and terminal equipment |
| CN201726364U (en) * | 2010-02-12 | 2011-01-26 | 上海楷锐音响设备有限公司 | Audio power amplifier with audio signal control switch |
| CN201937549U (en) * | 2010-11-29 | 2011-08-17 | 比亚迪股份有限公司 | Audio power amplification system and audio equipment |
| ITMI20110985A1 (en) * | 2011-05-31 | 2012-12-01 | St Microelectronics Srl | AUDIO AMPLIFIER CIRCUIT AND ITS OPERATING METHOD. |
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| CN103533181B (en) * | 2012-07-02 | 2016-03-23 | 北京鼎合远传技术有限公司 | Wake the apparatus and method of mobile terminal external equipment up |
| CN103208987B (en) * | 2013-03-19 | 2016-03-16 | 福建联迪商用设备有限公司 | The start awakening method of external connection terminal of audio frequency device |
| US9438982B2 (en) * | 2013-09-16 | 2016-09-06 | Cirrus Logic, Inc. | Systems and methods for detection of load impedance of a transducer device coupled to an audio device |
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