CN105955694A - Method and device for outputting HiFi audio frequency - Google Patents
Method and device for outputting HiFi audio frequency Download PDFInfo
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- CN105955694A CN105955694A CN201610250799.9A CN201610250799A CN105955694A CN 105955694 A CN105955694 A CN 105955694A CN 201610250799 A CN201610250799 A CN 201610250799A CN 105955694 A CN105955694 A CN 105955694A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/16—Sound input; Sound output
- G06F3/162—Interface to dedicated audio devices, e.g. audio drivers, interface to CODECs
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Abstract
The invention discloses a method and a device for outputting HiFi audio frequency. The method comprises: a Mobile-HiFi converter receiving an original PCM code stream and PCM format information sent by a mobile terminal; the Mobile-HiFi converter determining a standard clock based on the PCM format information; the Mobile-HiFi converter converting the PCM code stream to a zero-error I2S signal according to the standard clock, and outputting the I2S signal to an audio player device. The method and the device realizes to convert the original PCM code stream output by the mobile terminal to the zero-error I2S signal through the Mobile-HiFi converter, and the I2S signal is directly output to the audio player device which supports HiFi. The converting and outputting process greatly limits generation of jitter, and preferably assists high fidelity outputting of tone quality when the mobile terminal is used as a sound source.
Description
The application is filing date December in 2012 27, Application No. " 201210579386.7 ", invention
The divisional application of the application for a patent for invention of entitled " a kind of HiFi audio-frequency inputting method, device and system ".
Technical field
The present invention relates to communication technical field, particularly relate to a kind of HiFi (High-Fidelity high-fidelity) audio frequency
Output intent and device.
Background technology
(Mobile Internet Device moves for Android (Android) intelligent mobile terminal and MID at present
Internet device) the most universal, Android mobile terminal has abundant software, off-line can be play
With the audio-video document of online high-quality, greatly facilitate everybody entertainment life.Android moves end
It is many that end has playout software relative to common player, and UI (User Interface, user interface) interface is good,
Support network, the advantage such as portable.But for pursuing the use having had HiFi sound system in HiFi tonequality and family
For family, Android mobile terminal is unsatisfactory as tonequality during HiFi source of sound, causes the reason master of this problem
It is:
SRC (Sample Rate intrinsic for Audioflinger (audio manager) in 1, Android framework
Convertor, sample rate conversion) problem:
Android framework in order to the old-fashioned ALSA of compatibility (Advanced Linux Sound Architecture,
Senior Linux sound framework) drive, so the PCM that sample rate is 44.1KHz have to be transmitted downwards
(Pulse Code Modulation, pulse code modulation) code stream form, the voice data of other sample rates is all
Need to do SRC sample rate conversion.And the audio sample rate that high-quality audio frequency and video use at present is all 48KHz
The sample rate of the most higher 96KHz, 192KHz.So high-quality audio frequency sends into driving after the decoding
All can force before broadcasting to carry out SRC conversion, the principle of SRC is to use new frequency to enter the data sampled
Row resampling, when new sample rate is less than the integral multiple that old sample rate or new sample rate are not old sample rates,
The signal meeting serious distortion original signal that sampling obtains, as it is shown in figure 1, voice data just creates mistake in source
Very, when the sound of distortion can cause original Hi-quality Playback, sound field is deteriorated, and the crude sense of high frequency increases.
2, crystal oscillator inferior quality:
Do not introduce distortion during digital audio transmission, but when being converted into analogue signal, need high-precision clock
Can perfectly reduce original analog, so crystal oscillator is maximum on tonequality impact.Common Android
Mobile terminal, will not (44.1KHz needs 45.1584M etc. specially exclusively with characteristic frequency because it is contemplated that cost
Industry crystal oscillation fractional frequency obtains) and the professional audio clock of band temperature compensation:
Amateur clock such as 12M standard crystal oscillator, owing to not being integral multiple relation with 44.1KHz, it is impossible to passes through
Frequency dividing regain accurately 44.1K clock to DAC (digital to analog converter) decoding when producing jitter base tremble
Dynamic, as in figure 2 it is shown, jitter can allow the analogue signal converting digital signals into correspondence that DAC cannot be correct,
Produce distortion.So the tonequality of the ordinary audio of the 44.1KHz sample rate now play can be deteriorated
It addition, crystal oscillator is affected by temperature and electromagnetic interference etc. on mobile terminal, stablizing of clock all can be affected
Property, also can introduce jitter shake.
3, SOC (System on Chip, system level chip) built-in sound card impact on tonequality:
One complete sound card includes Digital Signal Processing, digital-to-analogue conversion, LPF (low pass filter) and voltage
Current amplifier function.In addition to the tonequality deterioration factor that crystal oscillator causes, the SOC that mobile terminal uses is built-in
Sound card at digital-to-analogue conversion algorithm, in filtering and amplifying circuit, the most do not do the process of specialty, to tonequality
Affect and be mainly manifested in following several aspect:
1) algorithm of Digital Signal Processing and digital-to-analogue conversion can introduce distortion；
2) LPF and analog circuit cannot provide good signal to noise ratio and straight frequency response curve, and electromagnetism is done
Disturb the obvious low noise of introducing；
3) boosting and Current amplifier are limited in one's ability, it is impossible to meet acoustic pressure and the current requirements of high impedance earphone.
4, the power supply mode of mobile terminal also has influence on power and the thrust of output, the earphone of all mobile terminals
Output cannot well promote high resistant Hi-Fi earphone.
In sum, it is known that affecting mobile terminal sound qualitative factor at present has a lot, then how to provide a kind of
Mechanism so that be capable of HD Audio output when mobile terminal is as source of sound, become the most urgently to be resolved hurrily
Technical problem.
Summary of the invention
The present invention provides a kind of HiFi audio-frequency inputting method, device and system, in order to solve shifting in prior art
The problem that dynamic terminal can not meet HD Audio output as source of sound.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is as follows:
On the one hand, the present invention provides a kind of HiFi audio-frequency inputting method, including:
Mobile-HiFi transducer receives original pcm stream and the PCM format information that mobile terminal sends；
Mobile-HiFi transducer, based on described PCM format information, determines standard time clock；
Described pcm stream, according to described standard time clock, is converted to zero error by Mobile-HiFi transducer
I2S signal, and described I2S signal is exported to audio-frequence player device.
Alternatively, in the method for the invention, logical between described Mobile-HiFi transducer and described mobile terminal
Cross wired or wireless mode to connect；
When wirelessly connecting, set up between described Mobile-HiFi transducer and described mobile terminal and have:
Connect in order to transmit the UDP UDP of PCM format information, and in order to transmit pcm stream
Transmission control protocol TCP connect.
Alternatively, in the method for the invention, described Mobile-HiFi transducer is based on described PCM format
Information, determines standard time clock, specifically includes:
Described Mobile-HiFi transducer, based on described PCM format information, is changed at described Mobile-HiFi
The crystal oscillator group that device is built-in selects the crystal oscillator with described PCM format information matches；
The standard time clock that described Mobile-HiFi transducer provides with the described crystal oscillator selected is the standard determined
Clock.
Alternatively, in the method for the invention, the built-in crystal oscillator group of described Mobile-HiFi transducer includes
Support 44.1KHz and the crystal oscillator of multiple thereof and include supporting 48KHz and the crystal oscillator of multiple thereof.
Alternatively, in the method for the invention, described by described I2S signal export to audio-frequence player device, enter
One step includes: described I2S signal is converted to SPDIF signal by Mobile-HiFi transducer, and by described
SPDIF signal exports to audio-frequence player device.
Alternatively, in the method for the invention, before by described SPDIF signal output to audio-frequence player device,
Farther include: described SPDIF signal is carried out isolation processing.
On the other hand, the present invention also provides for a kind of Mobile-HiFi transducer, including:
Information receiving module, for receiving original pcm stream and the PCM format that mobile terminal side sends
Information, and the information received is sent to Micro-processor MCV；
Micro-processor MCV, for based on described PCM format information, determines standard time clock, and according to institute
State standard time clock, described pcm stream is converted to the I2S signal of zero error, and by defeated for described I2S signal
Go out to audio-frequence player device.
Alternatively, in Mobile-HiFi transducer of the present invention, described Mobile-HiFi transducer and institute
State and connected by wired or wireless mode between mobile terminal；
When wirelessly connecting, set up between described Mobile-HiFi transducer and described mobile terminal and have:
Connect in order to transmit the UDP UDP of PCM format information, and in order to transmit pcm stream
Transmission control protocol TCP connect.
Alternatively, in Mobile-HiFi transducer of the present invention, described Mobile-HiFi transducer also wraps
Include crystal oscillator group；
Described MCU, specifically for based on described PCM format information, selects and institute in described crystal oscillator group
State the crystal oscillator of PCM format information matches, and the standard time clock provided with the described crystal oscillator selected is determine
Standard time clock.
Alternatively, in Mobile-HiFi transducer of the present invention, described crystal oscillator group includes supporting 44.1KHz
And the crystal oscillator of multiple and include supporting 48KHz and the crystal oscillator of multiple thereof.
Alternatively, in Mobile-HiFi transducer of the present invention, described Mobile-HiFi transducer also wraps
Include: the conversion chip of I2S to SPDIF；
Described MCU, for based on described PCM format information, determines standard time clock, and according to described mark
Punctual clock, is converted to described pcm stream the I2S signal of zero error, and is sent to by described I2S signal
The conversion chip of described I2S to SPDIF；
The conversion chip of described I2S to SPDIF, for the I2S signal of reception is converted to SPDIF signal,
And described SPDIF signal is exported to audio-frequence player device.
Alternatively, in Mobile-HiFi transducer of the present invention, described Mobile-HiFi transducer also wraps
Include: SPDIF sends chip；
The conversion chip of described I2S to SPDIF, for the I2S signal of reception is converted to SPDIF signal,
And the output of described SPDIF signal is sent chip to described SPDIF；
Described SPDIF sends chip, and after described SPDIF signal is carried out isolation processing, output is to sound
Frequently playback equipment.
The present invention has the beneficial effect that:
The original pcm stream that the present invention is achieved mobile terminal exports by Mobile-HiFi transducer turns
It is changed to the I2S signal of zero error, and I2S signal is directly output to support the audio-frequence player device of HiFi,
This conversion and output procedure significantly limit the generation of jitter, well facilitate mobile terminal as source of sound
Time tonequality high-fidelity output.
It addition, the present invention is arranged in Mobile-HiFi transducer I2S to SPDIF conversion chip or
The conversion chip of person I2S to SPDIF and SPDIF send chip so that Mobile-HiFi transducer can be held concurrently
Hold more universal coaxial interface.
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 enforcement
In example or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, retouch below
Accompanying drawing in stating is only some embodiments of the present invention, for those of ordinary skill in the art, not
On the premise of paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic diagram in prior art through the deterioration of SRC conversion process tonequality；
Fig. 2 is the jitter schematic diagram on tonequality deterioration impact in prior art；
The flow process of the Mobile-HiFi transducer side HiFi audio-frequency inputting method that Fig. 3 provides for the embodiment of the present invention
Figure；
The structured flowchart of a kind of mobile terminal that Fig. 4 provides for the embodiment of the present invention；
Fig. 5 be mobile terminal described in the embodiment of the present invention interface schematic diagram is set；
Fig. 6 is the audio frequency playing flow figure after AudioFlinger function described in the embodiment of the present invention is improved；
Fig. 7 is to set up between virtual HiFi sound card module and Mobile-HiFi transducer described in the embodiment of the present invention to lead to
The schematic diagram that letter connects；
The structured flowchart of a kind of Mobile-HiFi transducer that Fig. 8 provides for the embodiment of the present invention；
Fig. 9 is the general frame flow chart of the HiFi audio-frequency inputting method described in the embodiment of the present invention；
The structured flowchart of a kind of HiFi audio output system that Figure 10 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, be fully described by, it is clear that described embodiment be only 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 are not making creation
The every other embodiment obtained under property work premise, broadly falls into the scope of protection of the invention.
The embodiment of the present invention provides a kind of HiFi audio-frequency inputting method, device and system, and it is with cheap cost
Mobile terminal is converted to wireless digital rotating disk, well solves in prior art mobile terminal as source of sound
The problem that can not meet HD Audio output.Separately below to this in terms of methods, devices and systems are several
Technical scheme described in invention carries out launching explanation.
Embodiment one
The embodiment of the present invention provides a kind of HiFi audio-frequency inputting method, including:
The audio manager AudioFlinger of mobile terminal receive pulse code modulation pcm stream and
After PCM format information, the virtual HiFi sound card being pre-configured with in being pass-through to mobile terminal；
Alternatively, in this step, when AudioFlinger receives pcm stream and PCM format information,
Farther include: whether AudioFlinger detection mobile terminal opens HiFi output function, and in detection
To HiFi output function open time, described pcm stream and PCM format information are pass-through to mobile terminal
The virtual HiFi sound card being inside pre-configured with.
Preferably, mobile terminal, when HiFi output function is opened, enables testing mechanism, and based on user
Test triggers, and sets up and verifies the communication connection between described virtual HiFi sound card and Mobile-HiFi transducer.
Further, virtual HiFi sound card, will by the communication connection set up between Mobile-HiFi transducer
Described pcm stream and the transmission of PCM format information are to described Mobile-HiFi transducer；
In this step, the communication connection set up between described virtual HiFi sound card and Mobile-HiFi transducer includes
Wired connection or wireless connections, when for wireless connections, the communication connection of foundation includes: in order to transmit PCM
The UDP of format information connects, and connects in order to transmit the TCP of pcm stream.
Mobile-HiFi transducer side receives the handling process such as Fig. 3 institute after the information that mobile terminal side sends
Show, comprise the steps:
Step S301, Mobile-HiFi transducer receives pcm stream and the PCM format that mobile terminal sends
Information；
Step S302, Mobile-HiFi transducer is based on the PCM format information received, when determining standard
Clock；
In this step, Mobile-HiFi transducer is based on the PCM format information received, when determining standard
Clock, specifically includes:
1) Mobile-HiFi transducer is based on the described PCM format information received, at described Mobile-HiFi
The crystal oscillator group that transducer is built-in selects the crystal oscillator with described PCM format information matches；
2) standard time clock that Mobile-HiFi transducer provides with the crystal oscillator selected is the standard time clock determined.
Step S303, Mobile-HiFi transducer is according to described standard time clock, the pcm stream that will receive
Be converted to the I2S signal of zero error, and described I2S signal is exported to audio-frequence player device.
Preferably, this step can also be implemented as follows, and described I2S is believed by Mobile-HiFi transducer
Number be converted to SPDIF signal, and described SPDIF signal is exported to audio-frequence player device.
It is highly preferred that before by described SPDIF signal output to audio-frequence player device, farther include: right
Described SPDIF signal carries out isolation processing.
In sum, method described in the embodiment of the present invention is by carrying out merit to the AudioFlinger in mobile terminal
Can improve and in terminal, set up virtual HiFi sound card module, it is achieved that the output to original pcm stream,
Avoid AudioFlinger and pcm stream is carried out SRC, equilibrium and audio adjustment, it is ensured that data
Integrity, and then achieve when mobile terminal is as source of sound, it is ensured that tonequality high-fidelity exports.
Embodiment two
As shown in Figure 4, the embodiment of the present invention provides a kind of mobile terminal, including:
Audio manager AudioFlinger410, after being used for receiving pcm stream and PCM format information,
It is pass-through to virtual HiFi sound card module 420；
Wherein, AudioFlinger410, specifically for receiving pcm stream and PCM format information
After, whether detection mobile terminal opens HiFi output function, and when detecting that HiFi output function is opened,
Described pcm stream and PCM format information are pass-through to virtual HiFi sound card module 420.
Virtual HiFi sound card module 420, for the communication connection by setting up between Mobile-HiFi transducer,
Described pcm stream and PCM format information are transmitted to described Mobile-HiFi transducer.
Wherein, virtual HiFi sound card module 420, specifically for utilizing and setting up between Mobile-HiFi transducer
UDP connects transmission PCM format information, and utilizes and set up TCP between Mobile-HiFi transducer and be connected
Transmission pcm stream.
Wherein, between virtual HiFi sound card module and Mobile-HiFi transducer by wired or wireless mode (as
WiFi communication) communicate.
Preferably, mobile terminal described in the embodiment of the present invention, also include: test module 430, at HiFi
When output function is opened, enable testing mechanism, and test based on user triggers, and sets up and verifies described void
Intend the communication connection between HiFi sound card module and Mobile-HiFi transducer.
Illustrate based on said structure, improve and virtual from HiFi function setting, AudioFlinger separately below
Several aspect that arranges of HiFi sound card module realizes the concrete real of tonequality improvement to mobile terminal described in the present embodiment
Existing process is further elaborated, and is specifically related to following content:
One, increase Settings user interface: as it is shown in figure 5, design HD Audio output arranges module,
UI/UE and the linkage function of Mobile-HiFi transducer based on WiFi are provided.
After " enable HiFi output " clicks, mobile terminal arranges an attribute " persist.sys.usehifi=ture "
Whether judging the enable of HiFi for follow-up AudioFlinger, automatically open up WiFi simultaneously, enable " arranges nothing
Line digital audio care connects " button.
" wireless digital sound card connects setting " provides WiFi linkage interface, finds Mobile-HiFi transducer
Corresponding SSID (service set, Service Set Identifier) the most manual/auto connection, can after connection
To be communicated by testing button test IP, and verify UDP, TCP end being used for transmitting control information and data
Mouthful.
Two, AudioFlinger improve:
After HiFi output intent option is opened, AudioFlinger can not directly change the line being currently played
Journey and the broadcasting of track (track), only set up HiFi output and support, output it and set newly-built track
For being tied in the output of virtual HiFi sound card.
As shown in Figure 6, player process controls media by libmedia (media library) and takes HiFi output flow process
Business device Mediaserver process decoding and broadcasting, after the decoding of Mediaserver process, pass through pcm stream
AudioTrack is sent to MediaServer process in real time as medium and AudioFlinger can access
FIFO Buffer (first in first out buffer area), AudioFlinger then start broadcasting thread constantly from FIFO
Buffer consumes PCM data.If being now not detected by attribute persist.sys.userhifi=true, play line
Journey will continue to use traditional mode, carry out SRC, EQ (equalizer) as required, and Volume (volume) adjusts
Joint processes, and is then fed into audio frequency apparatus and plays out；Otherwise play thread and pcm stream is supplied directly to void
Intend HiFi sound card module.
Three, virtual HiFi sound card module:
Virtual HiFi sound card module (being operated in Client pattern) can receive sample rate, and position is deep waits PCM code
The format information of stream and pcm stream, by Socket (socket) be operated in Server pattern
Mobile-HiFi transducer is set up and is connected, as it is shown in fig. 7, wherein, the connection of foundation include UDP connect and
TCP connects.UDP connects work and the stopping transmitting control instruction to control rear end, by transmission PCM lattice
Formula information, in order to the generation clock that rear end can be correct；TCP connects real-time Transmission pcm stream, it is provided that rear end
Generate I2S signal.
In sum, mobile terminal of the present invention, by carrying out merit to the AudioFlinger in mobile terminal
Can improve and in terminal, set up virtual HiFi sound card module, it is achieved that the output to original pcm stream,
Avoid AudioFlinger and pcm stream is carried out SRC, equilibrium and audio adjustment, it is ensured that data
Integrity, and then achieve when mobile terminal is as source of sound, it is ensured that tonequality high-fidelity exports.
Embodiment three
As shown in Figure 8, the embodiment of the present invention provides a kind of Mobile-HiFi transducer, including:
Information receiving module 810, for receiving pcm stream and the PCM format letter that mobile terminal side sends
Breath, and the information received is sent to Micro-processor MCV；
Micro-processor MCV 820, for Based PC M format information, determines standard time clock, and according to described
Standard time clock, is converted to described pcm stream the I2S signal of zero error, and is exported by described I2S signal
To audio-frequence player device.
In the present embodiment, Mobile-HiFi transducer is connected by wired or wireless mode with between mobile terminal；
When wirelessly connecting, set up between Mobile-HiFi transducer and mobile terminal and have: in order to transmit
The UDP UDP of PCM format information connects, and in order to transmit the transmission control of pcm stream
Agreement TCP processed connects.
Preferably, described in the present embodiment, Mobile-HiFi transducer also includes crystal oscillator group 830；MCU820 base
In described PCM format information, described crystal oscillator group 830 selects the crystal oscillator with PCM format information matches,
And the standard time clock of the described crystal oscillator offer to select is the standard time clock determined.
In a preferred embodiment of the invention, described Mobile-HiFi transducer also includes: I2S arrives
The conversion chip 840 of SPDIF, now:
MCU820, based on described PCM format information, determines standard time clock, and according to described standard time clock,
Described pcm stream is converted to the I2S signal of zero error, and described I2S signal is sent to described I2S
Conversion chip 840 to SPDIF；
The conversion chip 840 of I2S to SPDIF, for being converted to SPDIF by the I2S signal that MCU820 sends
Signal, and described SPDIF signal is exported to audio-frequence player device.Preferably, this I2S to SPDIF
Conversion chip is to have independent crystal oscillator and the conversion chip of built-in phase-locked loop pll.
In a preferred embodiment of the invention, Mobile-HiFi transducer also includes: SPDIF sends core
Sheet 850, now:
The conversion chip 840 of I2S to SPDIF, for the I2S signal of reception is converted to SPDIF signal,
And the output of described SPDIF signal is sent chip 850 to SPDIF；
SPDIF sends chip 850, and after described SPDIF signal is carried out isolation processing, output is to sound
Frequently playback equipment.
The embodiment of the present invention achieves the PCM code of mobile terminal side by setting up Mobile-HiFi transducer
Circulation is changed to I2S signal and significantly limit the generation of jitter.Described in the visible embodiment of the present invention
Mobile-HiFi transducer matches with mobile terminal, it is achieved that when mobile terminal is as source of sound, it is ensured that
Tonequality high-fidelity exports.It addition, the present invention arranges I2S to SPDIF's in Mobile-HiFi transducer
Conversion chip or the conversion chip of I2S to SPDIF and SPDIF send chip so that Mobile-HiFi
Transducer can compatible more universal coaxial interface.
Embodiment four
The embodiment of the present invention is that device described in method described in embodiment one and embodiment two, three is entered one
Step illustrates, combines from mobile terminal side and Mobile-HiFi transducer side respectively and implements details, to this
The technical scheme of bright offer is further elaborated, and certainly, implementing described in the present embodiment is thin
Joint is only used for explaining the present invention, the most uniquely limits the present invention, is specifically related to following content:
The HiFi audio frequency that HiFi audio frequency output scheme is Android mobile terminal that the embodiment of the present invention is proposed
Output scheme.The program can utilize the broadband network that the powerful software platform of Android terminal is provided,
Massive store, high-speed decoding, the advantage such as abundant third party software, set up powerful audio frequency and video many
Media playback service platform, this platform is responsible for providing that Consumer's Experience is good, the player interface of complete function,
And the audio frequency and video of various compressions or lossless format are converted to original PCM format data stream.Existing
Android platform does not support this direct output original PCM format code stream, and the embodiment of the present invention is by right
Android platform audio frequency framework AudioFlinger improves so that it is possesses and exports original pcm stream
Ability.Owing to original PCM format Tstream is like the audio frequency of WAV form, PCM data is not because
Carry temporal information, it is not necessary to clock supports that it transmits, so during pcm stream transmits in theory not
Jitter and distortion can be introduced.
Mobile terminal described in the embodiment of the present invention by by original pcm stream through wired (such as USB
Mode) or it is transmitted wire-lessly on Mobile-HiFi transducer, Mobile-HiFi transducer is responsible for receiving former
Beginning pcm stream, then according to the sample rate of pcm stream with position is deep is converted to corresponding I2S (Inter IC
Sound) signal and SPDIF signal.A certain proportion of consumer level DAC has been had to support I2S signal at present
Input, so I2S signal can also directly export and play, but in view of the overwhelming majority DAC only prop up
Hold the pattern of the input of SPDIF, so Mobile-HiFi transducer also needs to have, I2S signal is converted to
The ability of SPDIF.After Mobile-HiFi transducer, original pcm stream just can be converted to disappear
Taking level DAC and signal that digital power amplifier can receive, Android mobile terminal is converted to by the program to be possessed
Online/local advanced digital rotating disk play.
As a example by connecting using Android4.0 version and WiFi as the network with Mobile-HiFi transducer below,
The detailed description of the invention of the embodiment of the present invention described in technical scheme be discussed in detail:
As it is shown in figure 9, for the general frame of technical scheme described in inventive embodiments and flow process, implemented
Journey is as follows:
Step 1, user controls whether to enable HiFi Out function by Settings (setting), and passes through
The connection of the Mobile-HiFi transducer that WiFi sets up and is operated under ap mode.
Step 2, local audio code stream (such as: ape, flac, wav, mp3, wma)/online code stream (example
Such as HLS, RTPS) solve through media server mediaserver or the third party of Android mobile terminal
Original pcm stream and PCM format information is converted to after the decoding of code engine.
Step 3, pcm stream sends AudioFlinger, AudioFlinger to and checks HiFi Out function
Enable, then opened virtual HiFi sound card module, and the PCM passed over by mediaserver in real time
Format information and PCM source code flow are not added with Mix (stereo process), and Effect (audio effect processing), at SRC
Reason, passes through virtual HiFi sound card module.
Step 4, after the virtual HiFi sound card module in AudioFlinger receives the format information of PCM and
Mobile-HiFi transducer controls port and sets up UDP (User Datagram Protocol, User Datagram Protocol
View) connect, sent by UDP and there is PCM sample rate and the PCM format information of breath is deeply convinced in position.
Step 5, after the PCM initial data code stream that virtual HiFi sound card receives, changes with Mobile-HiFi
Device is set up TCP and is connected, and by TCP real-time transparent transmission PCM initial data code stream.
Step 6, the MCU (micro-control unit) in Mobile-HiFi transducer divides from UDP, tcp port
Not Huo get formatted data and played data, according to formatted data select coupling crystal oscillator, generate zero error I2S
Signal；Wherein, according to formatted data select coupling crystal oscillator particularly as follows: according to the sample rate in formatted data,
The crystal oscillator mated with described sample rate is selected in the crystal oscillator group of Mobile-HiFi transducer；Preferably, crystal oscillator
Group includes supporting 44.1KHz and the crystal oscillator of multiple thereof, and includes supporting 48KHz and the crystal oscillator of multiple thereof.
Step 7, on the one hand the I2S signal that Mobile-HiFi transducer generates can be directly output to support HiFi
DAC decoder, the coaxial interface on the other hand more popularized for compatibility, specialty can be sent into
I2S--> SPDIF chip, generates SPDIF signal, then it is defeated to do isolation through professional SPDIF transmission chip
Go out, it is ensured that signal is clean.Wherein, described I2S--> SPDIF chip is for having independent crystal oscillator and built-in PLL
The conversion chip of (Phase Locked Loop, phaselocked loop), it can export the SPDIF letter of low jitter value
Number.
Step 8, Mobile-HiFi transducer is exported by the Specialty Hi-Fi equipment of Mobile-HiFi transducer rear end
Signal decode, filter, after processing and amplifying, be finally output to high-fidelity loudspeaker.
In sum, technical scheme described in the embodiment of the present invention achieves when mobile terminal is as source of sound, protects
Demonstrate,prove the output of tonequality high-fidelity.Exactly, the embodiment of the present invention ensure that tonequality from the following aspects:
1, from Android audio frequency framework, intercept and capture the PCM source code flow of unprocessed mistake, it is to avoid SRC
And equalizer, effect device adjusts, it is ensured that data are complete.
2, PCM source code flows without temporal information, are not subject to intelligence eventually during WiFi transmission/wire transmission
The internal crystal oscillator of end and high-frequency electromagnetic interference effect.
3, Mobile-HiFi transducers are by the format analysis to PCM source code flow, Dynamic Matching and sampling
The crystal oscillator of rate integral multiple, is converted to I2S signal by pcm stream zero error, greatly limits the generation of jitter.
4, be there is the conversion chip of I2S to the SPDIF of independent crystal oscillator and built-in PLL by employing, output
The SPDIF signal of low jitter value.
Furthermore, technical scheme described in the embodiment of the present invention can also be from reducing cost following aspects:
1, Android terminal is to also serve as numeral rotating disk, does not produce extra charge.
2, Mobile-HiFi transducers can be received chip by USB or network, commonly be had what I2S exported
32 single-chip microcomputers, I2S is converted to SPDIF chip and several the active crystal oscillators of professional audio are constituted, manufacturing cost
Relatively low；It addition, the reception of Mobile-HiFi transducer related network can be by existing wireless router, this
Time, Mobile-HiFi transducer can also omit the WiFi chip of costliness.
Embodiment five
As shown in Figure 10, the embodiment of the present invention also provides for a kind of HiFi audio output system, and this system includes reality
Execute the mobile terminal described in example two and the Mobile-HiFi transducer described in embodiment three.The embodiment of the present invention
Described system, by carrying out function improvement and setting up void in terminal to the AudioFlinger in mobile terminal
Intend HiFi sound card module, it is achieved that the output to original pcm stream, it is to avoid AudioFlinger is to PCM
Code stream carries out SRC, equilibrium and audio and adjusts, it is ensured that the integrity of data.Furthermore, the present invention passes through
Set up Mobile-HiFi transducer to achieve and pcm stream is converted to I2S signal significantly limit jitter
Generation.Mobile terminal can be converted to wireless digital rotating disk by visible technical scheme of the present invention, it is achieved
When mobile terminal is as source of sound, it is ensured that tonequality high-fidelity exports, and well solves in prior art
The problem existed.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (12)
1. a high-fidelity HiFi audio-frequency inputting method, it is characterised in that including:
Mobile-HiFi transducer receives original pcm stream and the PCM format information that mobile terminal sends；
Mobile-HiFi transducer, based on described PCM format information, determines standard time clock；
Described pcm stream, according to described standard time clock, is converted to zero error by Mobile-HiFi transducer
I2S signal, and described I2S signal is exported to audio-frequence player device.
2. the method for claim 1, it is characterised in that described Mobile-HiFi transducer and institute
State and connected by wired or wireless mode between mobile terminal；
When wirelessly connecting, set up between described Mobile-HiFi transducer and described mobile terminal and have:
Connect in order to transmit the UDP UDP of PCM format information, and in order to transmit pcm stream
Transmission control protocol TCP connect.
3. the method for claim 1, it is characterised in that described Mobile-HiFi transducer based on
Described PCM format information, determines standard time clock, specifically includes:
Described Mobile-HiFi transducer, based on described PCM format information, is changed at described Mobile-HiFi
The crystal oscillator group that device is built-in selects the crystal oscillator with described PCM format information matches；
The standard time clock that described Mobile-HiFi transducer provides with the described crystal oscillator selected is the standard determined
Clock.
4. method as claimed in claim 3, it is characterised in that described Mobile-HiFi transducer is built-in
Crystal oscillator group include supporting 44.1KHz and the crystal oscillator of multiple thereof and including supporting 48KHz and multiple thereof
Crystal oscillator.
5. the method as described in Claims 1-4 any one, it is characterised in that described by described I2S
Signal exports to audio-frequence player device, farther includes: described I2S signal is turned by Mobile-HiFi transducer
It is changed to SPDIF signal, and described SPDIF signal is exported to audio-frequence player device.
6. method as claimed in claim 5, it is characterised in that described SPDIF signal is being exported to sound
Frequently before playback equipment, farther include: described SPDIF signal is carried out isolation processing.
7. a Mobile-HiFi transducer, it is characterised in that including:
Information receiving module, for receiving original pcm stream and the PCM format that mobile terminal side sends
Information, and the information received is sent to Micro-processor MCV；
Micro-processor MCV, for based on described PCM format information, determines standard time clock, and according to institute
State standard time clock, described pcm stream is converted to the I2S signal of zero error, and by defeated for described I2S signal
Go out to audio-frequence player device.
8. Mobile-HiFi transducer as claimed in claim 7, it is characterised in that described Mobile-HiFi
It is connected by wired or wireless mode between transducer with described mobile terminal；
When wirelessly connecting, set up between described Mobile-HiFi transducer and described mobile terminal and have:
Connect in order to transmit the UDP UDP of PCM format information, and in order to transmit pcm stream
Transmission control protocol TCP connect.
9. Mobile-HiFi transducer as claimed in claim 7, it is characterised in that described Mobile-HiFi
Transducer also includes crystal oscillator group；
Described MCU, specifically for based on described PCM format information, selects and institute in described crystal oscillator group
State the crystal oscillator of PCM format information matches, and the standard time clock provided with the described crystal oscillator selected is determine
Standard time clock.
10. Mobile-HiFi transducer as claimed in claim 9, it is characterised in that in described crystal oscillator group
Including supporting 44.1KHz and the crystal oscillator of multiple thereof and including supporting 48KHz and the crystal oscillator of multiple thereof.
The 11. Mobile-HiFi transducers as described in claim 7 to 10 any one, it is characterised in that
Described Mobile-HiFi transducer also includes: the conversion chip of I2S to SPDIF；
Described MCU, for based on described PCM format information, determines standard time clock, and according to described mark
Punctual clock, is converted to described pcm stream the I2S signal of zero error, and is sent to by described I2S signal
The conversion chip of described I2S to SPDIF；
The conversion chip of described I2S to SPDIF, for the I2S signal of reception is converted to SPDIF signal,
And described SPDIF signal is exported to audio-frequence player device.
12. Mobile-HiFi transducers as claimed in claim 11, it is characterised in that described Mobile-HiFi
Transducer also includes: SPDIF sends chip；
The conversion chip of described I2S to SPDIF, for the I2S signal of reception is converted to SPDIF signal,
And the output of described SPDIF signal is sent chip to described SPDIF；
Described SPDIF sends chip, and after described SPDIF signal is carried out isolation processing, output is to sound
Frequently playback equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610250799.9A CN105955694B (en) | 2012-12-27 | 2012-12-27 | A kind of HiFi audio-frequency inputting method and device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210579386.7A CN103077003B (en) | 2012-12-27 | 2012-12-27 | A kind of HiFi audio-frequency inputting method, device and system |
| CN201610250799.9A CN105955694B (en) | 2012-12-27 | 2012-12-27 | A kind of HiFi audio-frequency inputting method and device |
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| CN201210579386.7A Division CN103077003B (en) | 2012-12-27 | 2012-12-27 | A kind of HiFi audio-frequency inputting method, device and system |
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| CN105955694A true CN105955694A (en) | 2016-09-21 |
| CN105955694B CN105955694B (en) | 2019-01-08 |
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| CN201610250799.9A Expired - Fee Related CN105955694B (en) | 2012-12-27 | 2012-12-27 | A kind of HiFi audio-frequency inputting method and device |
| CN201210579386.7A Expired - Fee Related CN103077003B (en) | 2012-12-27 | 2012-12-27 | A kind of HiFi audio-frequency inputting method, device and system |
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Cited By (4)
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| CN108319443A (en) * | 2018-01-26 | 2018-07-24 | 维沃移动通信有限公司 | A kind of audio-frequency inputting method, mobile terminal and audio playing apparatus |
| CN108391202A (en) * | 2018-02-27 | 2018-08-10 | 惠州市德赛西威汽车电子股份有限公司 | A kind of onboard audio dynamic sampling method and system |
| CN111313984A (en) * | 2020-02-19 | 2020-06-19 | 北京瑞森新谱科技股份有限公司 | Testing device and method for various audio codes of Bluetooth headset |
| CN115243161A (en) * | 2022-07-13 | 2022-10-25 | 上海富芮坤微电子有限公司 | Audio output pin multiplexing circuit, device and method |
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| CN105955694B (en) * | 2012-12-27 | 2019-01-08 | 中兴通讯股份有限公司 | A kind of HiFi audio-frequency inputting method and device |
| CN105991700B (en) * | 2015-02-06 | 2019-07-02 | 百度在线网络技术（北京）有限公司 | Handle method, cloud server system and the terminal device of voice data |
| CN106293659A (en) * | 2015-05-21 | 2017-01-04 | 阿里巴巴集团控股有限公司 | A kind of audio frequency real-time processing method, device and intelligent terminal |
| CN104954941B (en) * | 2015-06-10 | 2018-09-14 | 福州瑞芯微电子股份有限公司 | High-performance low-power-consumption HIFI decodes system |
| CN106454628A (en) * | 2015-08-06 | 2017-02-22 | 中兴通讯股份有限公司 | Method and terminal of controlling hifi function |
| CN105183482A (en) * | 2015-09-23 | 2015-12-23 | 浪潮(北京)电子信息产业有限公司 | Network simulation development testing method and system |
| CN105913860A (en) * | 2015-12-18 | 2016-08-31 | 乐视致新电子科技（天津）有限公司 | Method and apparatus for playing high-fidelity (HIFI) sound through multiple players |
| CN105828272A (en) * | 2016-04-28 | 2016-08-03 | 乐视控股（北京）有限公司 | Audio signal processing method and apparatus |
| CN106792118A (en) * | 2016-12-20 | 2017-05-31 | 北京小米移动软件有限公司 | The player method and device of multimedia file |
| CN110034828B (en) * | 2018-01-12 | 2021-11-19 | 网宿科技股份有限公司 | Audio acquisition method and server for cloud application |
| CN109474394B (en) * | 2018-12-28 | 2021-08-17 | 思必驰科技股份有限公司 | Detection method, system and detection device for sound card communication data |
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| CN108391202A (en) * | 2018-02-27 | 2018-08-10 | 惠州市德赛西威汽车电子股份有限公司 | A kind of onboard audio dynamic sampling method and system |
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| CN115243161A (en) * | 2022-07-13 | 2022-10-25 | 上海富芮坤微电子有限公司 | Audio output pin multiplexing circuit, device and method |
| CN115243161B (en) * | 2022-07-13 | 2023-06-27 | 上海富芮坤微电子有限公司 | Audio output pin multiplexing circuit, device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105955694B (en) | 2019-01-08 |
| CN103077003B (en) | 2016-08-03 |
| WO2013167021A2 (en) | 2013-11-14 |
| WO2013167021A3 (en) | 2014-01-03 |
| CN103077003A (en) | 2013-05-01 |
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