CN103514925B - Method, digital media controller and the digital audio players that audio frequency is play - Google Patents
Method, digital media controller and the digital audio players that audio frequency is play Download PDFInfo
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- CN103514925B CN103514925B CN201210222337.8A CN201210222337A CN103514925B CN 103514925 B CN103514925 B CN 103514925B CN 201210222337 A CN201210222337 A CN 201210222337A CN 103514925 B CN103514925 B CN 103514925B
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Abstract
The invention discloses method, digital media controller and digital audio players that a kind of audio frequency is play, this digital media player comprises the first digital audio players and at least one second digital audio players, and the method includes: detect the audio presentation time between the first digital audio players and at least one second digital audio players poor；And foundation audio presentation time difference controls the audio frequency broadcasting of at least one second digital audio players, so that the audio frequency of at least one second digital audio players plays the audio frequency broadcasting being synchronized with the first digital audio players.
Description
Technical field
The present invention relates to media play technology, and synchronize multiple digital media players particularly to one
The method of the audio frequency broadcasting of (digital media render, DMR) and circuit.
Background technology
DLNA (Digital Living Network Alliance, DLNA) aims at
Set up a set of so that the product of each manufacturer interconnects, the industrial standard being adapted to each other, thus for disappearing
Expense person realizes Digital Life, and the specification of DLNA is also applied to the audio-visual matchmaker of household digital
In body Play System, wherein include a digital media controller (digital media controller, DMC),
One digital media server (digital media server, DMS) and multiple digital media player
(digital media render,DMR).But, when the plurality of digital media player and this Digital Media
When wirelessly connecting between server and this digital media controller, the plurality of Digital Media plays
Device be wirelessly from this digital media server receive voice data to carry out audio frequency broadcasting, benefit is
Simplifying the configuration of circuit and increase the flexibility ratio of equipment variations in the future, but, shortcoming is owing to being wirelessly transferred
Degree of stability not as stablizing that wire transmission comes, by dry in the initial state play or the way of broadcasting
When disturbing, between the plurality of digital media player, likely can produce obvious asynchronous situation.Even exist
Gap slightly under the situation that line is stable, between the oscillator frequency of each digital media player
As long-time broadcasting and gradually audio frequency play nonsynchronous situation occur.Therefore, how to control also
And synchronize the problem that the plurality of digital media player has become needed badly the solution in this field.
For traditionally for synchronizing the way of multiple digital media players, use one definitely
The idea of time, furthermore, it is understood that each digital media player can obtain an absolute time
Information and using it as following.But, comprise many systems of DLNA in order to
For the sake of simplification, do not provide the information of absolute time, the practice traditionally can be caused thus herein
It has obstacles and be difficult to walk.Accordingly, it would be desirable to the Synchronization Design of an innovation solves between multiple digital media player
Stationary problem.
Summary of the invention
The one of the purpose of the present invention is to provide a kind of audio frequency synchronizing multiple digital media player to play
Method and relevant apparatus solve the problems referred to above.
According to the first embodiment of the present invention, disclose a kind of audio frequency synchronizing multiple digital media player and broadcast
The method put.The plurality of digital media player comprises one first digital audio players and at least
Second digital audio players.The method include detecting this first digital audio players with
An audio presentation time between this at least one second digital audio players is poor；And according to this sound
Frequently reproduction time difference controls the audio frequency broadcasting of this at least one second digital audio players, so that should
The audio frequency broadcasting of at least one second digital audio players is synchronized with this first digital audio media and broadcasts
The audio frequency putting device is play.
According to the second embodiment of the present invention, a kind of number in order to synchronize multiple digital media player is disclosed
Word media controller.The plurality of digital media player comprise one first digital audio players with extremely
Few one second digital audio players.This digital media controller includes a circuit for detecting and
Control circuit.This circuit for detecting in order to detect this first digital audio players with this at least one second
An audio presentation time between digital audio players is poor.This control circuit is coupled to this detecting electricity
Road, in order to control this at least one second digital audio players according to this audio presentation time difference
Audio frequency play so that this at least one second digital audio players audio frequency play be synchronized with this first
The audio frequency of digital audio players is play.
According to the third embodiment of the invention, disclose a kind of digital audio players, include a sound
Frequency is play and is adjusted circuit and a control circuit.This control circuit is in order to receive from a digital media controller
One does not mate relative time locations, and does not mate relative time locations according to this and control this audio frequency and play and adjust
Whole circuit, so that the audio frequency of this digital audio players is play is synchronized with this first digital audio media
The audio frequency of player is play, and wherein this does not mate relative time locations and corresponds to this digital audio media and broadcast
Put the audio presentation time between device and this first digital audio players poor.
In a digital media broadcasting system, in particularly one wireless digital media play system, owing to passing
The defeated upper or instability of initial state, the method that the present invention proposes is applicable to this Digital Media and plays
System, makes the audio frequency between multiple digital audio players play and is maintained synchronizing.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an embodiment of digital media broadcasting system of the present invention.
Fig. 2 is that the present invention synchronizes one first digital audio players and at least one second DAB matchmaker
The flow chart of one embodiment of the method that the audio frequency of body player is play.
Fig. 3 is the flow chart of an embodiment of the step 202 shown in Fig. 2.
Fig. 4 is the flow chart of an embodiment of the step 204 shown in Fig. 2.
Fig. 5 is the schematic diagram of an embodiment of the digital media controller shown in Fig. 1.
Fig. 6 is the flow chart of an embodiment of the step 402 shown in Fig. 4.
Fig. 7 is the present invention controls the second digital audio players according to not mating relative time locations
The flow chart of an embodiment of method play of audio frequency.
Fig. 8 is the schematic diagram of a first embodiment of the second digital audio players shown in Fig. 1.
Fig. 9 is that the present invention controls numeral sound according to DAB package quantity and DAB amount of bits
Frequently the flow chart of an embodiment of the method that the audio frequency of media player is play.
Figure 10 is the schematic diagram of one second embodiment of the second digital audio players shown in Fig. 1.
Wherein, description of reference numerals is as follows:
100: digital media broadcasting system
102: digital media server
104,500: digital media controller
106: digital media player
108: the first digital audio players
110: the second digital audio players
202、204、302、304、306、402、404、602、604、606、608、702、704、
1002,1004,1102,1104: step
502: circuit for detecting
504,808,1002: control circuit
512: judging unit
514: phase-locked loop unit
516: switch unit
800,1000: digital audio players
802: audio frequency package parser
803: the first audio frequency play adjustment unit
804: audio frequency package decoder
806: the second audio frequency play adjustment unit
810: relative time locations bin
812,1004: audio frequency is play and adjusted circuit
Detailed description of the invention
Some vocabulary is employed to censure specific unit in the middle of description and follow-up claim
Part.Person with usual knowledge in their respective areas is it is to be appreciated that manufacturer may claim with different nouns
Exhale same element.This specification and follow-up claim are not used as district with the difference of title
The mode of subelement, but the criterion distinguished it is used as with element difference functionally.Illustrate in the whole text
" comprising " mentioned in the middle of book and follow-up claims is an open term, therefore should be construed to " bag
Contain but be not limited to ".It addition, " coupling " word comprises at this and any directly and is indirectly electrically connected
Means.Therefore, if a first device is coupled to one second device described in literary composition, then this first device is represented
Can directly be electrically connected in this second device, or be indirectly electrically connected by other devices or connection means
To this second device.
In a digital media broadcasting system, multiple digital media players may include multiple numeral
Audio frequency media player (such as family's theater or 5.1 channel stereo loudspeaker), sound in general application
The broadcasting more than one of sound, in the application that some is newer, is carried out not only for multiple sound play devices
Integrate, even require to be controlled a numeral sound by a digital media controller in the environment of being wirelessly transferred
Frequency according to being transmitted separately in the plurality of digital audio players by a digital media server and
Instant broadcasting.Owing to transmission is upper or the instability of initial state, tend not to ensure that this Digital Media is broadcast
In place system, the audio frequency broadcasting between the plurality of digital audio players maintains synchronization forever, it is necessary to straight
Connect or indirectly utilize and be related to temporal information and monitored and revised at any time.
Refer to the schematic diagram of the embodiment that Fig. 1, Fig. 1 are digital media broadcasting system of the present invention.This
In embodiment, digital media broadcasting system 100 includes digital media server 102, numeral matchmaker
Body controller 104 and multiple digital media player 106 (such as one first digital audio players
(digital audio media such as, being selected the reference being used as other digital audio players is play
Device) 108 (play and adjust for example, it is desired to carry out audio frequency with at least one second digital audio players 110
The digital audio players synchronized to reach audio frequency to play)).Owing to synchronizing one first DAB matchmaker
Body player (such as, single reference number audio frequency media player) is play with one second digital audio media
The operation that the audio frequency of device (such as, audio frequency plays nonsynchronous single digital audio players) is play can
It is readily extended to synchronize one first digital audio players (such as, single reference number media player)
(such as, audio frequency plays nonsynchronous multiple digital audio media with multiple second digital audio players
Player) audio frequency play operation, therefore, do not affecting the present invention technology disclose under, for letter
For the sake of clean, Fig. 1 only shows two digital audio players, it practice, Digital Media plays system
System 100 may also set up plural digital audio players.
Digital media server 102 can provide digital audio-frequency data MAGive the first digital audio media to play
Device 108 and the second digital audio players 110, therefore, the first digital audio players 108
Can be based on digital audio-frequency data M with the second digital audio players 110ACarry out audio frequency respectively to broadcast
Put, as previously described, because transmission is upper or the instability of initial state, tend not to ensure Digital Media
The first digital audio players 108 and the second digital audio media in Play System 100 are play
Audio frequency between device 110 is play and is forever maintained synchronization, and therefore, in the present embodiment, Digital Media controls
Device 104 can control the first digital audio players 108 and the second numeral sound via appropriately designed
Frequently the synchronization that the audio frequency between media player 110 is play.
Refer to Fig. 2, it synchronizes one first digital audio players and at least one second for the present invention
The flow chart of one embodiment of the method that the audio frequency of digital audio players is play.If generally may be used
Reach identical result, be not required to necessarily carry out in accordance with the sequence of steps in the flow process shown in Fig. 2,
And the step shown in Fig. 2 is not necessarily intended to be carried out continuously, namely other steps also can be inserted into wherein, additionally,
Some step in Fig. 2 is omitted also dependent on different embodiments or design requirement.For example (but this
Bright it is not limited thereto), digital media controller 104 can use the method to synchronize the first DAB matchmaker
The audio frequency of body player 108 and the second digital audio players 110 is play, and controls what audio frequency was play
The method synchronized includes following steps:
Step 202: detect the first digital audio players 108 and the second digital audio media is play
Audio presentation time difference dRT between device 11012；And
Step 204: according to audio presentation time difference dRT12Control the second digital audio players
The audio frequency of 110 is play, so that the audio frequency of the second digital audio players 110 is play is synchronized with first
The audio frequency of digital audio players 108 is play.
Shown in the embodiment of Fig. 2 of the present invention, in step 202., audio presentation time difference dRT12
In renders digital audio data MATime, owing to some factor is caused the first digital audio players
108 and second relative times between digital audio players 110 are poor, and that i.e. plays is asynchronous,
For example (but the present invention is not limited to this example), if digital media server 102 uses wireless
Mode is respectively with the second digital audio players 110 and the first digital audio players 108
Link, then each link can each own different distance, different disturbing and different channel patterns, also
That is, digital audio-frequency data MAArrive the second digital audio media from digital media server 102 to broadcast
The time putting device 110 and the first digital audio players 108 may be inconsistent, then lifts additionally
One example (present invention is again not limited to this example), when multiple digital media players 106 are in order to enter
When row is wirelessly transferred or increases other special active sexual function, need to be respectively provided with independent digital circuit
Process digital audio-frequency data MAAnd it is converted to an analog audio data, in other words, multiple
The multiple digital circuits being respectively provided with in digital media player 106 are respectively provided with respective seasonal pulse
Source, and cannot ensure that respective seasonal pulse source is identical, the most respective seasonal pulse can be deposited between source respectively
At a frequency error, once after accumulation after a while, this frequency error may form one can
It is noticeable and needs the asynchronous problem being compensated for.Appoint it addition, digital media controller 104 can use
What feasible mode obtains audio presentation time difference dRT12, for example (but the present invention not as
Limit), can be via processing the first digital audio players 108 and the broadcasting of the second digital audio media
What device 110 each transmitted is implied with the information of time cue to obtain audio presentation time difference dRT12,
Detailed implementation methods will explanation in embodiment after a while.
For Zheng Chang, digital media broadcasting system 100 can have multiple digital audio players (example
Horn system such as 5.1 sound channels), therefore, can choose a certain from the plurality of digital audio players
Digital audio players is used as digital audio players (namely above-mentioned first number of reference
Word tone frequency media player 108).In an implementation, can at random choose a digital audio media and broadcast
Put device and be used as the digital audio players of reference, and without considering that the plurality of digital audio media is broadcast
Put device audio frequency each other and play speed relation；But, in another implementation, then refer to this
Multiple digital audio players audio frequency each other plays speed relation, determines which numeral sound
Frequently media player will be as the digital audio players of reference, such as, and the plurality of DAB matchmaker
There is among body player a maximal audio play relative time locations (namely audio frequency plays the fastest numeral
Audio frequency media player) it is used as the digital audio players of reference, in other words, the first above-mentioned number
Word tone frequency media player 108 can have the audio frequency of maximum in multiple digital media players and play relatively
Time location, therefore the audio content that the first digital audio players 108 is play at present is not yet by
Two digital audio players 110 are play.
For the synchronization asking audio frequency to play, understand in digital media broadcasting system 100 with the first DAB matchmaker
The sound that body player 108 is play is that Primary Reference object (in other words, play by the first digital audio media
The broadcast state of device 108 can be as the reference of other digital audio players), therefore, according to audio frequency
Reproduction time difference dRT12Control the audio frequency of the second digital audio players 110 to play and follow the
One digital audio players 108, so that the audio frequency of the second digital audio players 110 is play
The audio frequency being synchronized with the first digital audio players 108 is play, as indicated in step 204.Such one
Come, by audio presentation time difference dRT12The first digital audio players 108 and second can be learnt
Audio frequency between digital audio players 110 plays asynchronous state, therefore when can play according to audio frequency
Between difference dRT12Accelerate or slow down the audio frequency broadcasting speed of the second digital audio players 110.
Refer to the flow chart of the embodiment that Fig. 3, Fig. 3 are the step 202 shown in Fig. 2.If it is big
Can reach identical result on body, be not required to necessarily enter according to the sequence of steps in the flow process shown in Fig. 3
OK, and the step shown in Fig. 3 is not necessarily intended to be carried out continuously, namely other steps also can be inserted into wherein, this
Outward, some step in Fig. 3 can be omitted according to different embodiments or design requirement.In the present embodiment, step
The concrete operations of rapid 202 can include following steps:
Step 302: receive an audio frequency from the first digital audio players 108 and play relative time position
Put RT1；
Step 304: receive an audio frequency from the second digital audio players 110 and play relative time position
Put RT2；And
Step 306: calculate audio frequency and play relative time locations RT1And audio frequency broadcasting relative time locations
RT2Time difference be used as audio presentation time difference dRT12。
Note that the audio frequency in step 302 plays relative time locations (relative time position) RT1
It is sent to digital media controller 104 by the first digital audio players 108, and the opportunity transmitted
Can be that the first digital audio players 108 is actively claimed by digital media controller 104
REQ1Afterwards, it is also possible to be that the actively timing of the first digital audio players 108 sends out, so
And this is illustrative purposes, the embodiment provided is not in order to limit the scope that the present invention is contained.It addition,
Audio frequency plays relative time locations RT1Digital audio-frequency data M may be includedALength and at present time
Between the information such as the time location play of point.Similarly, when the audio frequency in step 304 is play relative
Between position RT2Also being such, therefore, the second digital audio players 110 can be in response to requiring REQ2
Export audio frequency and play relative time locations RT2Or actively timing sends out.When audio frequency is play relative
Between position RT1And audio frequency broadcasting relative time locations RT2Time difference the most just can play as audio frequency
Time difference dRT12, and audio frequency is play the action synchronized and is i.e. intended to play audio frequency relative time locations RT1
And audio frequency broadcasting relative time locations RT2Time difference be reduced into zero, that is to say hope by audio frequency play
Time difference dRT12It is reduced into zero.
Refer to the flow chart of the embodiment that Fig. 4, Fig. 4 are the step 204 shown in Fig. 2.If it is big
Can reach identical result on body, be not required to necessarily enter according to the sequence of steps in the flow process shown in Fig. 4
OK, and the step shown in Fig. 4 is not necessarily intended to be carried out continuously, namely other steps also can be inserted into wherein.This
Outward, some step in Fig. 4 can be omitted according to different embodiments or design requirement.The tool of step 204
Gymnastics is made to include following steps:
Step 402: according to audio presentation time difference dRT12Produce one and do not mate relative time locations
(mismatching relative time position)MRTP1；And
Step 404: according to not mating relative time locations MRTP1Control the second digital audio media to broadcast
The audio frequency putting device 110 is play.
In one embodiment of the invention, digital media controller 104 can be poor according to audio presentation time
dRT12Produce and do not mate relative time locations MRTP1, to broadcast as controlling the second digital audio media
Put the control output that the audio frequency of device 110 is play, therefore, step 402 do not mates relative time locations
MRTP1It is via to audio presentation time difference dRT12Carry out related operation process and obtain, implement in detail
Method will explanation in embodiment after a while.It addition, digital media controller 104 can be according to not mating relatively
Time location MRTP1Reference is followed in the audio frequency broadcasting controlling the second digital audio players 110
Object (namely first digital audio players 108), so that the second digital audio players 110
Audio frequency play be synchronized with the first digital audio players 108 audio frequency play, such as step 404 institute
Show.
Refer to the signal of the embodiment that Fig. 5, Fig. 5 are the digital media controller 104 shown in Fig. 1
Figure.Digital media controller 104 can be carried out implementation in addition by digital media controller 500.Digital Media control
Device 500 processed is in order to synchronize multiple digital media player (the such as first digital audio players 108
With the second digital audio players 110) audio frequency play, as it can be seen, digital media controller 500
Include a circuit for detecting 502 and be coupled to a control circuit 504, Qi Zhongzhen of circuit for detecting 502
Slowdown monitoring circuit 502 is the operation performing above-mentioned steps 202, and control circuit 504 is to perform
The running of above-mentioned steps 204, in other words, circuit for detecting 502 is broadcast in order to detect the first digital audio media
Put audio-visual relative time locations RT1 and the audio frequency phase of the second digital audio players 110 of device 108
To time location RT2Between audio presentation time difference dRT12, and control circuit 504 is in order to foundation
Audio presentation time difference dRT12Export and do not mate relative time locations MRTP1To control the second numeral sound
Frequently the audio frequency of media player 110 is play, and then makes the audio frequency of the second digital audio players 110
Play the audio frequency broadcasting being synchronized with the first digital audio players 108.In the present embodiment, control electricity
Road 504 includes judging unit 512, phase-locked loop unit 514 and a switch unit 516,
Wherein circuit for detecting 502 is respectively coupled to judging unit 512, phase-locked loop unit 514 and switching list
Unit 516, it is judged that unit 512 is respectively coupled to phase-locked loop unit 514 and switch unit 516.Control
Circuit 504 processed can use the method shown in Fig. 6 not mated relative time locations MRTP1。
See also the flow process of the embodiment that Fig. 5 and Fig. 6, Fig. 6 are the step 402 shown in Fig. 4
Figure.If generally can reach identical result, it is not required to necessarily according to the step in the flow process shown in Fig. 6
Rapid order is carried out, and the step shown in Fig. 6 is not necessarily intended to be carried out continuously, namely other steps also can be inserted
Enter wherein.Additionally, some step in Fig. 6 can be omitted according to different embodiments or design requirement.Step
The concrete operations of 402 can include following steps:
Step 602: comparing audio reproduction time difference dRT12With marginal value dRTTH；
Step 604: judge that the first digital audio players 108 and the second digital audio media are play
Whether the audio frequency of device 110 is play and is synchronized to be steady statue？When audio presentation time difference dRT12Less than critical
Value dRTTHTime, then judge that audio frequency is play and synchronize as steady statue, then execution step 606；And work as sound
Frequently reproduction time difference dRT12Not less than marginal value dRTTHTime, then judge that audio frequency is play and synchronize to be not steady
Determine state, then perform step 608；
Step 606: at least use a phase-locked loop unit 514 according to audio presentation time difference dRT12
Produce and do not mate relative time locations MRTP1；
Step 608: directly output audio presentation time difference dRT12It is used as not mating relative time locations
MRTP1, and reset phase-locked loop unit 514.
Judging unit 512 can perform step 602,604 judge the first digital audio players 108
Whether be steady statue, and switch list if playing Tong Bu with the audio frequency of the second digital audio players 110
Unit 516 then according to the output of judging unit 512, optionally switches the defeated of phase-locked loop unit 514
The output (step 608) going out (step 606) or circuit for detecting 502 is used as not mating relative time locations
MRTP1.It should be noted that step 602, the 604 synchronism stability states detected are used as follow-up
Two kinds process audio presentation time difference dRT12The differentiating method of mode, it is however generally that, initial at line
Or because the line caused under the situation of poor signal interrupts the line again caused, first all can be made
Bigger sound is produced between digital audio players 108 and the second digital audio players 110
Frequently reproduction time difference dRT12, but, under normal line and the situation that continuously transmits, when audio frequency is play
Between difference dRT12Generally change is less.Then according to above-mentioned judgment mechanism, if being in one stably synchronize shape
During state, cause audio presentation time difference dRT12Reason cause except seasonal pulse shake and random noise
Outside irregular minor variations, main source is the first digital audio players 108 and the second numeral
The frequency error existed between audio frequency media player 110 respective seasonal pulse source is made via constantly accumulation
Audio presentation time difference dRT become12, it can increase with the speed of rule, although speed is relatively slow,
But get off for a long time and may still build up the degree can experienced to user.Due in stable sync status
Under, audio presentation time difference dRT12Amplitude of variation is less, and the interior seasonal pulse of cannot telling of short time is trembled
Irregular minor variations that dynamic and random noise is caused or the rule change that frequency error is caused,
Therefore need first to audio presentation time difference dRT12Carry out process could be used, in order to avoid causing system
Instability, in the present embodiment, audio presentation time difference dRT12Lock can be input to as a phase error
Phase circuit units 514 is to chase after the seasonal pulse of lock the first digital audio players 108, i.e. step 606.
Anti-, if synchronization is a unsteady state, audio presentation time difference dRT12It is generally all to expect
And relatively steady statue get off big so that compensation immediately, therefore when unsteady state, switching is single
Unit 516 directly output audio presentation time difference dRT12It is used as not mating relative time locations MRTP1,
And judging unit 512 can reset (reset) phase-locked loop unit 514, i.e. step 608.
It should be noted, it is judged that the first digital audio players 108 is broadcast with the second digital audio media
Put the audio frequency of device 110 to play and synchronize to be whether that the skill of steady statue is not limited to the step shown in Fig. 6
Suddenly, marginal value dRT and in step 602THCan according to varying environment or should be used for set, even face
Dividing value dRTTHIt can also be a variation value with adaptability (adaptive).And other above-mentioned designs
Fall within the interior of scope of the invention.
Play additionally, single control circuit 504 is only capable of processing single audio frequency reproduction time difference to control audio frequency,
Therefore for the digital media controller 500 shown in Fig. 5, it applies to control one first DAB
Audio frequency between media player and single second digital audio players is play and is synchronized, but,
If there are M the second digital audio players, then digital media controller 500 must be via suitably
It is poor according to other audio presentation time respectively that amendment and M corresponding control circuit of simultaneously arranging in pairs or groups are come
dRT11、dRT21、…、dRTM1Export accordingly and do not mate relative time locations MRTP1、
MRTP2、…、MRTPM。
In the present embodiment, digital media controller 104/500 can export does not mates relative time locations
MRTP1To the second digital audio players 110, control the second digital audio players 110
Audio frequency play, in other words, based on not mating relative time locations MRTP1, the second digital audio media
The audio frequency of player 110 is play and will be adjusted.Referring to Fig. 7, Fig. 7 is that the present invention is according to not mating
Relative time locations MRTP1Control the side that the audio frequency of the second digital audio players 110 is play
The flow chart of one embodiment of method.If generally can reach identical result, it is not required to certain according to figure
Sequence of steps in flow process shown in 7 is carried out, and the step shown in Fig. 7 is not necessarily intended to be carried out continuously,
Namely other steps also can be inserted into wherein.Additionally, some step in Fig. 7 can according to different embodiments or
Design requirement omits.The operation of the audio frequency broadcasting controlling the second digital audio players 110 can comprise
There are following steps:
Step 702: relative time locations MRTP will not be mated according to an audio frequency package length1Be converted to need
DAB package quantity V to be adjustedPAnd a numeral of remaining this audio frequency package length of deficiency
Audio bit quantity VB；And
Step 704: according to DAB package quantity VPWith DAB amount of bits VBControl
The audio frequency of two digital audio players 110 is play.
Synchronize the first digital audio players 108 and sound of the second digital audio players 110
It is to make both same positions in synchronization renders digital audio data MA that frequency is play, in other words,
Being under the state of stable playback and good synchronization, it is necessary to ensure that each moment, both of which is play same
Digital audio-frequency data MAIn same package in same bit.Therefore, step 702 can be first
Relative time locations MRTP will not be mated1Be converted to DAB package quantity V needing to adjustPAnd
DAB amount of bits V of this audio frequency package length of remaining deficiencyB, different single to facilitate according to two kinds
Position processes the Synchronization Control of the second digital audio players 110.If DAB package quantity
VPWith DAB amount of bits VBNumerical value be all not zero, then DAB package quantity VPCan be with envelope
Wrap the audio frequency broadcasting affecting the second digital audio players 110 for unit, meanwhile, DAB
Amount of bits VBThe audio frequency that can bitwise affect the second digital audio players 110 is broadcast
Put；If DAB package quantity VPNumerical value be not zero, and DAB amount of bits VBNumerical value
Be zero, then DAB package quantity VPThe second digital audio media can be affected in units of package to broadcast
The audio frequency putting device 110 is play；And if DAB package quantity VPNumerical value be zero, and numeral sound
Frequently amount of bits VBNumerical value be not zero, then DAB amount of bits VBCan bitwise shadow
The audio frequency ringing the second digital audio players 110 is play.
In an implementation, the second digital audio players 110 can be responsible for producing DAB envelope
Bag quantity VPAnd DAB amount of bits VB(step 702), and the broadcasting of the second digital audio media
The audio frequency of device 110 is play and is controlled also to be the inside unit by the second digital audio players 110 itself
Part realizes (step 704).Further details will be described in detail in the following.
Refer to that Fig. 8, Fig. 8 are the second digital audio players 110 shown in Fig. 1 one first
The schematic diagram of embodiment.Second digital audio players 110 can be by digital audio players 800
Realizing, in this embodiment, digital audio players 800 includes an audio frequency package parser
(audio packet parser) 802,1 first audio frequency plays adjustment unit, and (such as audio frequency package skips over controller
(audio packet skip controller)) 803, one audio frequency package decoder (audio packet PCM
Decoder) 1304,1 second audio frequency plays adjustment unit (such as block PCM data shift controller
(block PCM data shift controller)) 806, one control circuit 808 and a relative time locations storage
Storage (such as memorizer) 810.First audio frequency plays adjustment unit 803 and the second audio frequency plays adjustment unit
806 is to constitute the audio frequency in digital audio players 800 to play adjustment circuit 812.Audio frequency package
Parser 802 receives a digital audio-frequency data input (number such as provided by digital media server 102
Word voice data MA), and package anatomy gone out transmits the first audio frequency and plays adjustment unit 803, and the
The package that one audio frequency broadcasting adjustment unit 803 is exported then inputs to audio frequency package decoder 804, then,
Package can be converted to initial data (namely PCM data) and export to the second sound by audio frequency package decoder 804
Frequency plays adjustment unit 806.Note that the first audio frequency plays adjustment unit 803 and the second audio frequency is play
Adjustment unit 806 is controlled the control of circuit 808, so that the sound of digital audio players 800
Frequency plays the audio frequency broadcasting being synchronized with the first digital audio players 108, wherein control circuit 808
Receive from digital media controller 104/500 and do not mate relative time locations MRTP1, and according to an audio frequency
Package length will not mate relative time locations MRTP1Be converted to the DAB package needing to adjust
Quantity VPAnd DAB amount of bits V of remaining this audio frequency package length of deficiencyB, this enforcement
In example, DAB amount of bits VBIt is input to the second audio frequency and plays adjustment unit 806 to adjust sound
Frequently package decoder 804 is decoded the voice data bit produced, and DAB package quantity VPThen
It is input to the first audio frequency broadcasting adjustment unit 803 and adjusts input treating to audio frequency package decoder 804
The audio frequency package of decoding.Additionally, control circuit 808 is another according to not mating relative time locations MRTP1
The audio frequency updating digital audio players 800 plays relative time locations RT1。
In the present embodiment, it is positioned at the first audio frequency broadcasting adjustment unit and can skip over the mode of (skip) audio frequency package
(namely accelerating broadcasting speed) affects the audio frequency of digital audio players 800 and plays, and the second sound
Frequency broadcasting adjustment unit 806 then can skip over audio frequency package decoder 804 according to demand and be decoded generation
Voice data bit (namely accelerate broadcasting speed) or voice data bit that newly-increased numerical value is 0 to sound
Frequently package decoder 804 is decoded the voice data bit (namely slowing down broadcasting speed) produced, with impact
The audio frequency of digital audio players 800 is play.
As it was previously stated, do not mate relative time locations MRTP1It is divided into DAB package after conversion
Quantity VPAnd DAB amount of bits VB, namely utilize two components with not commensurate's progression
Adjust digital audio players 800 and with acquisition Fast synchronization and stablize Tong Bu two kind characteristic, change
Sentence is talked about, and uses a coarse adjustment (cores tune) component and fine setting (fine tune) component to control numeral sound
Frequently the audio frequency of media player 800 is play.This coarse adjustment component (i.e. DAB package quantity VP) input is extremely
First audio frequency is play adjustment unit 803 and is adjusted play position in units of package, additionally this fine setting is divided
Amount (i.e. DAB amount of bits VB) it is input to the second audio frequency broadcasting adjustment unit 806 with bit as list
Position adjusts play position.But play adjustment unit 803 utilization when the first audio frequency and skip at audio frequency package
When reason synchronizes, owing to change is more violent, digital audio players 800 can be made temporarily to be in quiet
State to avoid user to discover and to feel lofty, and at steady state, digital audio media is play
When device 800 bitwise adjusts play position, the most generally will not be discovered by user, therefore need not
Digital audio players 800 is made to enter quiet state.
Referring to Fig. 9, Fig. 9 is that the present invention is according to DAB package quantity and DAB amount of bits
Control the flow chart of an embodiment of the method for the audio frequency broadcasting of digital audio players.If it is big
Can reach identical result on body, be not required to necessarily enter according to the sequence of steps in the flow process shown in Fig. 9
OK, and the step shown in Fig. 9 is not necessarily intended to be carried out continuously, namely other steps also can be inserted into wherein.This
Outward, some step in Fig. 9 can be omitted according to different embodiments or design requirement.Control DAB
The method that the audio frequency of media player is play includes following steps:
Step 902: according to audio frequency package quantity VPControl digital audio players, to adjust number
Audio frequency package to be decoded in word tone frequency media player；And
Step 904: according to audio bit quantity VBControl digital audio players, to adjust number
The voice data bit of word tone frequency the decoded generation of media player.
The behaviour of each step in Fig. 9 should be will readily appreciate that after reading above-mentioned paragraph owing to being familiar with operator
Make, therefore further instruction is omitted in the hope of succinctly at this.
Note that and will not mate relative time locations MRTP1Be converted to DAB package quantity VPWith
And DAB amount of bits VBIt is only the implementation practices in one of which Synchronization Control, not necessarily
Means, for example, when not mating relative time locations MRTP1Numerical value little time, can be direct
Use and do not mate relative time locations MRTP1The audio frequency controlling digital audio players is play.Please
Refering to one second embodiment that Figure 10, Figure 10 are the second digital audio players shown in Fig. 1
Schematic diagram.Second digital audio players 110 can be real by digital audio players 1000
Make.In this embodiment, digital audio players 1000 includes above-mentioned audio frequency package anatomy
Device 802, audio frequency package decoder the 804, second audio frequency play adjustment unit 806 and relative time position
Put bin 810, and also comprise a control circuit 1002.Second audio frequency is play adjustment unit 806 and is constituted
Audio frequency in digital audio players 1000 is play and is adjusted circuit 1004.Control circuit 1002 is direct
Relative time locations MRTP is not mated in output1Control the second audio frequency and play adjustment unit 806, so that number
The audio frequency of word tone frequency media player 1000 is play and is synchronized with the first digital audio players 108
Audio frequency is play.Change in this design also belongs to the scope of the present invention.
In Fig. 8, the digital audio players shown in 10, control circuit 808/1002 can be according to not
Coupling relative time locations MRTP1Update the audio frequency recorded in relative time locations bin 810
Play relative time locations RT1, its sound intermediate frequency plays relative time locations RT1During for calculating audio frequency broadcasting
Between difference dRT12Foundation, and audio presentation time difference dRT1AVRelative time locations is not mated for calculating
MRTP1Foundation, in other words, audio frequency play relative time locations RT1When not mating relative for calculating
Between position MRTP1Foundation.Therefore, when not mating relative time locations MRTP according to be calculated1
When adjusting digital audio players, the same time needs to update audio frequency according to adjusted amount and broadcasts
Put relative time locations RT1, with the problem avoiding occurring over and over again to repeat to compensate.
The foregoing is only presently preferred embodiments of the present invention, all according to scope of the present invention patent done equal
Deng change and modification, the covering scope of the present invention all should be belonged to.
Claims (17)
1. synchronize the method that the audio frequency of multiple digital media players is play, the plurality of Digital Media
Player comprises one first digital audio players and at least one second digital audio players,
The method includes:
Detect this first digital audio players and this at least one second digital audio players
Between an audio presentation time poor；And
The sound of this at least one second digital audio players is controlled according to this audio presentation time difference
Frequency is play, so that the audio frequency of this at least one second digital audio players is play is synchronized with this first number
The audio frequency of word tone frequency media player is play；
Wherein, this at least one second digital audio players is controlled according to this audio presentation time difference
Audio frequency play step comprise:
Produce one according to this audio presentation time difference and do not mate relative time locations, wherein, according to this sound
Frequently reproduction time difference produces this step not mating relative time locations and comprises:
Judge that this first digital audio players is broadcast with this at least one second digital audio media
The audio frequency putting device plays whether synchronization is steady statue, comprises:
Relatively this audio presentation time difference and a marginal value；
When this audio presentation time difference is less than this marginal value, then judges that this audio frequency is play and synchronize
For steady statue；And
When this audio presentation time difference is not less than this marginal value, then judge that this audio frequency is play and synchronize
It it is not steady statue；
Synchronize to be steady statue if this audio frequency is play, the most at least use a phase-locked loop unit to carry out basis
This audio presentation time difference produces this and does not mate relative time locations；And
Synchronize and unsteady state if this audio frequency is play, the most directly export this audio presentation time difference
Do not mate relative time locations as this, and reset this phase-locked loop unit；And
Relative time locations is not mated to control this at least one second digital audio players according to this
Audio frequency play.
2. the method for claim 1, the most the plurality of digital media player is wirelessly
And receive audio frequency package from a digital media server and carry out audio frequency broadcasting.
3. the method for claim 1, wherein detect this first digital audio players with
The step of this audio presentation time difference between this at least one second digital audio players comprises:
Receive one first audio frequency from this first digital audio players and play relative time locations；
Receive one second audio frequency from this at least one second digital audio players and play relative time position
Put；And
Calculate this first, second audio frequency play relative time locations time difference be used as this audio frequency play time
Between poor.
4. the method for claim 1, does not wherein mate relative time locations and controls according to this
The step that the audio frequency of this at least one second digital audio players is play includes:
According to an audio frequency package length, this is not mated relative time locations and be converted to the sound that needs adjust
Frequently package quantity and an amount of bits of this audio frequency package length of remaining deficiency；And
This at least one second digital audio media is controlled according to this audio frequency package quantity and this amount of bits
The audio frequency of player is play.
5. method as claimed in claim 4, wherein according to this audio frequency package quantity and this amount of bits
The step of the audio frequency broadcasting controlling this at least one second digital audio players includes:
This at least one second digital audio players is controlled, to adjust according to this audio frequency package quantity
Audio frequency package to be decoded in this at least one second digital audio players；And
This at least one second digital audio players is controlled, to adjust this extremely according to this amount of bits
The voice data bit of few one second decoded generation of digital audio players.
6. the method for claim 1, does not wherein mate relative time locations and controls according to this
The step that the audio frequency of this at least one second digital audio players is play includes:
Relative time locations is not mated to control this at least one second digital audio players according to this,
To adjust the voice data bit of this decoded generation of at least one second digital audio players.
7. the method for claim 1, does not wherein mate relative time locations and controls according to this
The step that the audio frequency of this at least one second digital audio players is play also includes:
Relative time locations is not mated to update this at least one second digital audio players according to this
One audio frequency play relative time locations.
8. the method for claim 1, wherein this first digital audio players is many in this
Individual digital media player has a maximal audio and plays relative time locations.
9. in order to synchronize a digital media controller for multiple digital media player, the plurality of numeral
Media player comprises one first digital audio players and broadcasts with at least one second digital audio media
Putting device, this digital media controller includes:
One circuit for detecting, in order to detect this first digital audio players and this at least one second numeral
An audio presentation time between audio frequency media player is poor；And
One control circuit, is coupled to this circuit for detecting, in order to control this according to this audio presentation time difference
The audio frequency of at least one second digital audio players is play, so that this at least one second DAB matchmaker
The audio frequency of body player plays the audio frequency broadcasting being synchronized with this first digital audio players；Wherein,
This control circuit produces one according to this audio presentation time difference and does not mate relative time locations, and foundation
This does not mate relative time locations broadcasts to the audio frequency controlling this at least one second digital audio players
Put, and this control circuit include:
One judging unit, in order to judge this first digital audio players with this at least one second
Whether one audio frequency of digital audio players is play and is synchronized to be steady statue；
One phase-locked loop unit, does not mate in order to produce this according to this audio presentation time difference relatively
Time location, wherein when this judging unit judges that this audio frequency plays synchronization not as steady statue,
This phase-locked loop unit can reset；And
One switch unit, is coupled to this judging unit and this phase-locked loop unit, is used to this judgement
This audio frequency of unit judges is play when synchronizing as steady statue, exports produced by this phase-locked loop unit
This does not mate relative time locations, and judges that this audio frequency is play synchronization and is not in this judging unit
During steady statue, direct this audio presentation time difference of output is used as this and does not mate relative time position
Put.
10. digital media controller as claimed in claim 9, wherein this circuit for detecting is from this first number
Word tone frequency media player receives one first audio frequency and plays relative time locations, from this at least one second numeral
Audio frequency media player receive one second audio frequency play relative time locations, and calculate this first, second
It is poor that the time difference of audio frequency broadcasting relative time locations is used as this audio presentation time.
11. digital media controller as claimed in claim 9, wherein this judging unit compares this audio frequency
Reproduction time difference and a marginal value；When this audio presentation time difference is less than this marginal value, then this judgement list
Unit judges that this audio frequency is play and synchronizes as steady statue；And when this audio presentation time difference is critical not less than this
Value, then this judging unit judges that this audio frequency plays synchronization not as steady statue.
12. digital media controller as claimed in claim 9, wherein this first digital audio media is broadcast
Put device and there is in the plurality of digital media player a maximal audio broadcasting relative time locations.
13. 1 kinds of digital audio players, include:
One audio frequency is play and is adjusted circuit；And
One control circuit, does not mate relative time locations in order to receive one from a digital media controller, and
Do not mate relative time locations according to this and control this audio frequency broadcasting adjustment circuit, so that this DAB matchmaker
The audio frequency of body player is play and is synchronized with the audio frequency of another digital audio players and plays, and wherein this is not
Coupling relative time locations is corresponding to this digital audio players and this another digital audio media
An audio presentation time between player is poor, and wherein this control circuit will according to an audio frequency package length
This does not mate relative time locations and is converted to audio frequency package quantity and the remaining deficiency that needs adjust
One amount of bits of this audio frequency package length, and control with this amount of bits according to this audio frequency package quantity
Make this audio frequency and play adjustment circuit.
14. digital audio players as claimed in claim 13, wherein this digital audio media
Player wirelessly receives audio frequency package from a digital media server and carries out audio frequency broadcasting.
15. digital audio players as claimed in claim 13, wherein this audio frequency is play and is adjusted
Circuit adjusts audio frequency envelope to be decoded in this digital audio players according to this audio frequency package quantity
Bag, and the voice data of the decoded generation of this digital audio players is adjusted according to this amount of bits
Bit.
16. digital audio players as claimed in claim 13, wherein these control circuit foundations
This does not mate relative time locations plays adjustment circuit to control this audio frequency, to adjust this digital audio media
The voice data bit of the decoded generation of player.
17. digital audio players as claimed in claim 13, wherein this control circuit separately depends on
Do not mate relative time locations to play relatively to the audio frequency updating this digital audio players according to this
Time location.
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| CN201210222337.8A CN103514925B (en) | 2012-06-29 | 2012-06-29 | Method, digital media controller and the digital audio players that audio frequency is play |
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| CN201210222337.8A CN103514925B (en) | 2012-06-29 | 2012-06-29 | Method, digital media controller and the digital audio players that audio frequency is play |
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| CN105025566B (en) * | 2014-04-25 | 2018-08-14 | 惠州超声音响有限公司 | Method for synchronizing time and system |
| CN106454420B (en) * | 2016-10-08 | 2019-10-25 | Oppo广东移动通信有限公司 | A kind of clock synchronizing method and device |
| CN107509139B (en) * | 2017-08-17 | 2021-01-26 | 京东方科技集团股份有限公司 | Audio processing device, method and media device capable of sounding |
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|---|---|---|---|---|
| US5245667A (en) * | 1991-04-03 | 1993-09-14 | Frox, Inc. | Method and structure for synchronizing multiple, independently generated digital audio signals |
| WO1998056117A1 (en) * | 1997-06-04 | 1998-12-10 | Dspc Technologies Ltd. | Voice-channel frequency synchronization |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7706901B2 (en) * | 2004-10-01 | 2010-04-27 | Microsoft Corporation | Low latency real-time audio streaming |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5245667A (en) * | 1991-04-03 | 1993-09-14 | Frox, Inc. | Method and structure for synchronizing multiple, independently generated digital audio signals |
| WO1998056117A1 (en) * | 1997-06-04 | 1998-12-10 | Dspc Technologies Ltd. | Voice-channel frequency synchronization |
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Effective date of registration: 20171201 Address after: The Liu Wu Road section of the three horizontal road in the new city of Shijie Town, Dongguan, Guangdong Patentee after: Dongguan di Finney electroacoustic technology Co., Ltd. Address before: Taipei City, Taiwan, China Patentee before: Zhishen Science and Technology Co., Ltd. |