CN106407157A - Universal serial bus audio frequency locking device and method - Google Patents
Universal serial bus audio frequency locking device and method Download PDFInfo
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Abstract
The invention discloses a device and a method for audio frequency locking of a universal serial bus, wherein the device comprises: a USB receiving port for receiving a frame start signal and an audio data transmitted by a USB host; a buffer processor for receiving and storing the audio data transmitted from the USB port and counting the audio data with a clock to generate an audio data amount; a controller for receiving the frame start signal transmitted by the USB receiving port, counting the period time of the frame start signal by a clock to generate a frame start count, and generating a control signal according to the frame start count and the audio data amount; and a clock adjuster for receiving the control signal to adjust the clock.
Description
Technical field
The present invention is with regard to a kind of apparatus and method of USB (universal serial bus) audio frequency frequency locking.
Background technology
In the past, analogue audio frequency was play and was often applied in radio, simulated television etc., straight with analog signal
Connect driving loudspeaker.With scientific and technological progress, the evolution at PC and networking and digit audio frequency signal
Process development, digit audio frequency play be applied to various electronic systems for example cinema, domestic,
The sound equipments such as automobile, and DVB-T, various types computer, walkman, mobile phone etc..Its middle pitch
Frequency signal drive function must possess low noise, high-quality characteristic so that acoustics more
Perfect.
Analogue audio frequency is play and is often applied in radio, simulated television etc., with analog signal direct drive
Loudspeaker.The transmission of existing digit audio frequency data is in a large number using USB (universal serial bus) (Universal
Serial Bus, USB) port.Ordinary circumstance is all to be held number by USB host (Host)
Position audio data is sent to universal serial bus device (Device) end.Audio data for instantaneity
Transmission and broadcasting, often cause audio frequency because of the difference between the clock of device end and the clock of host side
The damage of data, produces the situation playing pause or distortion.
A kind of method of adjustment clock is frame beginning (the Start of using the transmission of USB host end
Frame, SOF) signal to be adjusting the clock at universal serial bus device end.But needed for this kind of mode
Adjustment time too long, needs the memory capacity of great quantities of spare to provide to access or to easily cause audio frequency
The damage of material.
The present invention proposes a kind of technology of USB (universal serial bus) audio frequency frequency locking, via frame beginning (Start of
Frame, SOF) signal and device end audio frequency bin in data quantity how many, and then adjusting apparatus end
Clock, faster track the clock of host side.
Content of the invention
The embodiment of the present invention can provide the apparatus and method with regard to USB (universal serial bus) audio frequency frequency locking.
A disclosed embodiment is with regard to a kind of device of USB (universal serial bus) audio frequency frequency locking, this dress
Put and comprise：One USB (universal serial bus) receiving port, receives the one of a USB host transmission
Frame beginning signal and an audio data；One buffer, receives and storage USB (universal serial bus) receives
The audio data of port transmission, and an audio data is produced with this audio data of a clock count
Amount；One controller, receives this frame beginning signal of USB (universal serial bus) receiving port transmission, with clock
Count frame beginning signal cycle time produce a frame beginning count number, and according to frame beginning count number with
This audio data amount is producing a control signal；And a clock adjustor, receive control signal and come
Adjust this clock.
In an optional embodiment, buffer comprises a buffer with sequence side
Formula receives audio data.
In an optional embodiment, buffer comprises a rolling counters forward audio data
To produce audio data amount.
In an optional embodiment, controller is by frame beginning count number and a reference count amount ratio
Relatively, edit one first weight, and audio data amount compared with a upper limit amount and a lower limit amount,
And edit one second weight.
In an optional embodiment, controller is added according to the first weight and the second weight
Number, to produce control signal.
Disclosed another embodiment is with regard to a kind of method of USB (universal serial bus) audio frequency frequency locking, this
Method comprises：Using a buffer, receive and store a USB host transmission
One audio data, and an audio data amount is produced with this audio data of a clock count；Use
One controller, receives a frame beginning signal of USB host transmission, with this frame of clock count
Produce a frame beginning count number cycle time of beginning signal, and according to frame beginning count number and this audio frequency
Data quantity is producing a control signal；And use a clock adjustor, adjusted according to control signal
This clock whole.
In an optional embodiment, buffer uses a buffer with sequence side
Formula receives audio data.
In an optional embodiment, buffer uses a rolling counters forward audio data
To produce audio data amount.
In an optional embodiment, frame beginning count number is compared by method with a reference count amount,
And edit one first weight, and audio data amount is compared with a upper limit amount and a lower limit amount, and
Edit one second weight.
In an optional embodiment, according to the addition number of the first weight and the second weight, come
Produce control signal.
Brief description
Fig. 1 is to implement the consistent schematic diagram of example with disclosed one, and a kind of general serial is described
The device of bus frequency frequency locking.
Fig. 2 is to implement the consistent schematic diagram of example with disclosed one, illustrates general in Fig. 1
Universal serial bus receiving port.
Fig. 3 is to implement the consistent schematic diagram of example with disclosed one, and the buffering in Fig. 1 is described
Processor.
Fig. 4 is to implement the consistent schematic diagram of example with disclosed one, and controller root is described
To produce a control signal according to frame beginning count number and this audio data amount.
Fig. 5 is to implement the consistent schematic diagram of example with disclosed one, and explanation is a kind of general
The method of universal serial bus audio frequency frequency locking.
Wherein, description of reference numerals is as follows：
The device of 100 USB (universal serial bus) audio frequency frequency lockings
110 USB (universal serial bus) (USB) receiving port
111 frame beginning signals
112 audio datas
120 buffer
121 audio data amounts
130 controllers
131 frame beginning count number
132 control signals
140 clock adjustors
510 use a buffer, receive and store the one of a USB host transmission
Audio data, and an audio data amount is produced with this audio data of a clock count
520 use a controller, receive USB host transmission frame beginning signals, with when
The cycle time that clock counts this frame beginning signal produces a frame beginning count number, and begins to count according to frame
Amount to produce a control signal with this audio data amount
530 use a clock adjustor, adjust this clock one clock generator according to control signal
Specific embodiment
Hereinafter, with reference to accompanying drawing, describe in detail according to embodiments of the invention, so that ability
Domain person be apparent to.Described creation can adopt the embodiment of multiple changes, when can not only limit
Due to these embodiments.The present invention omits the description of known (well-known part), and identical
Reference number represent identical element in the present invention.
The present invention proposes the technology of USB (universal serial bus) audio frequency frequency locking, and adjustment sequence is confluxed in time
The clock at arranging device end, faster tracks the clock with serial bus host side.Fig. 1 is
A schematic diagram consistent with a disclosed enforcement example, illustrates a kind of USB (universal serial bus) audio frequency lock
The device of frequency.
In FIG, the device 100 of this USB (universal serial bus) audio frequency frequency locking comprises：One general serial
Bus (USB) receiving port 110, receives a frame beginning (Start of of a USB host transmission
Frame, SOF) signal 111 and an audio data 112；One buffer 120, receives and stores
The audio data of USB (universal serial bus) receiving port transmission, and with this audio data of a clock count
To produce an audio data amount 121；One controller 130, receives USB (universal serial bus) receiving terminal oral instructions
This frame beginning signal 111 sending, to produce a frame beginning cycle time of clock count frame beginning signal 111
Count number 131, and a control is produced according to frame beginning count number 131 and this audio data amount 121
Signal 132；And a clock adjustor 140, receive control signal 132 to adjust this clock.
The enforcement example of the device according to USB (universal serial bus) in Fig. 1 (USB) audio frequency frequency locking is logical first
Receive a frame beginning (Start of of a USB host transmission with universal serial bus receiving port 110
Frame, SOF) signal 111 and an audio data 112.Fig. 2 be and invented one enforcement example
A consistent schematic diagram, illustrates the USB (universal serial bus) receiving port 110 in Fig. 1.With reference to Fig. 2,
One frame beginning (Start of Frame, SOF) signal 111 and a sound are transmitted by a USB host
Frequency data 112.Wherein frame beginning (Start of Frame, SOF) signal 111 is a periodic pulse
Initial signal, and audio data 112 is the audio signal data of a sampling, in each frame beginning signal
111 cycle times were sent to USB (universal serial bus) receiving port 110 in continuous sequence mode, such as Fig. 2
Shown.
The enforcement example of the device according to USB (universal serial bus) in Fig. 1 (USB) audio frequency frequency locking, at buffering
Reason device 120 receives and stores the audio data of USB (universal serial bus) receiving port transmission, and with one
This audio data of clock count is producing an audio data amount 121.Fig. 3 is and a disclosed enforcement
The consistent schematic diagram of example, illustrates the buffer 120 in Fig. 1.With reference to Fig. 3, at buffering
Reason device 120 comprises an a buffer 310 e.g. first in first out (First In First out, FIFO)
Bin, receives the audio data through the transmission of USB (universal serial bus) receiving port in serial fashion, and
And it is sent to follow-up audio frequency amplifier in serial fashion.Buffer 120 also comprises a counting
Device 320 carrys out the capacity of the audio data of institute's buffer storage in count buffer bin 310, to produce
Audio data amount 121, this audio data amount is as shown in Figure 3.
The enforcement example of the device according to USB (universal serial bus) in Fig. 1 (USB) audio frequency frequency locking, controller
130 this frame beginning signal 111 receiving the transmission of USB (universal serial bus) receiving port, are begun with clock count frame
Produce a frame beginning count number 131 cycle time of signal 111, and according to frame beginning count number 131
To produce a control signal 132 with this audio data amount 121.Fig. 4 be and disclosed one enforcement model
The consistent schematic diagram of example, illustrates that controller is produced with this audio data amount according to frame beginning count number
One control signal.With reference to the enforcement example of Fig. 4, controller 130 first begins to believe with clock count frame
Numbers 111 cycle time produces frame beginning count number S.
Hold above-mentioned, then controller 120 can be produced with audio data amount B according to frame beginning count number S
A raw control signal, as described herein below.Controller 120 can be by frame beginning count number S and a ginseng first
Examine count number R to compare, and edit one first weight W1.Wherein reference count amount is that reference frame begins to believe
Number count number, i.e. the frame beginning signal-count amount of main frame transmission.Wherein manner of comparison can be using for example
One comparator, to compare frame beginning count number S and reference count amount R.If S>R, then edit first
Weight W1 is+1.If S=R, editing the first weight W1 is 0.If S<R, then edit
First weight W1 is -1.If above-mentioned S>R, represents frame beginning count number S of this audio frequency frequency locking device
More than reference frame beginning signal-count amount R, the clock of this audio frequency frequency locking device is compared with the reference clock of main frame
Hurry up, if above-mentioned S<R, represents that frame beginning count number S of this audio frequency frequency locking device is less than reference frame and begins to believe
Number count number R, the clock of this audio frequency frequency locking device is slow compared with the reference clock of main frame.
Hold above-mentioned, then controller 120 can be by audio data amount B and upper limit amount U and a lower limit
Amount L compares, and edits one second weight W2.Wherein upper limit amount U and lower limit amount L are buffering storages
Upper limit amount U of storage 310 and lower limit amount L are it is assumed for example that the capacity of buffer 310 is
4Mb (million bits), and edit upper limit amount U be 3Mb and lower limit amount L be 1Mb.Wherein compare
Mode can use such as comparator, to compare news data quantity B and upper limit amount U and lower limit amount L ratio
Relatively.If B is L, editing the second weight W2 is+2.If U>B>L, then edit the second weight
Amount W2 is 0.If B is U, editing the second weight W2 is -2.If above-mentioned B L, represent
This audio data amount is less than the lower limit of buffer capacity, audio data amount in this buffer
Send out relatively receive fast.If above-mentioned B U, this audio data amount is higher than buffer capacity
The upper limit, in this buffer audio data amount sends out relatively receive slow.
Hold above-mentioned, last controller 120 can produce according to the first weight W1 and the second weight W2
Control signal 132.Can be for example the first weight W1 and the second weight W2 according to gross weight W
Addition number, i.e. W=W1+W2, to produce control signal 132.If such as W 0, produce
Control signal 132 is, for example, a high potential.If W<0, then produce control signal 132 e.g.
Electronegative potential.
The enforcement example of the device according to USB (universal serial bus) in Fig. 1 (USB) audio frequency frequency locking, clock is adjusted
Whole device 140, receives control signal 132 to adjust this clock.Clock adjustor 140 can receive above-mentioned
Middle is, for example, high potential according to the control signal 132 that gross weight W produces or electronegative potential adjusts this
Clock.In implementing example, if the control signal 132 that clock adjustor 140 receives is high potential,
Represent that the clock of this audio frequency frequency locking device is fast compared with the reference clock of main frame or/and the transmission of audio data amount
Comparatively fast, then clock can adjust slowly, to follow the reference clock of main frame and to reach frequency locking
Function.In implementing example, if the control signal 132 that clock adjustor 140 receives is electronegative potential,
Represent that the clock of this audio frequency frequency locking device is slow compared with the reference clock of main frame or/and the transmission of audio data amount
Relatively slow, then clock can adjust soon, to follow the reference clock of main frame and to reach frequency locking
Function.
Example is implemented according to another, Fig. 5 illustrates a kind of USB (universal serial bus) (USB) audio frequency frequency locking
Method, the method comprises：Using a buffer, receive and storage one USB (universal serial bus) master
One audio data of machine transmission, and an audio data is produced with this audio data of a clock count
Amount (step 510)；Using a controller, the frame receiving USB host transmission begins to believe
Number, a frame beginning count number is produced with the cycle time of this frame beginning signal of clock count, and according to
Frame beginning count number to produce a control signal (step 520) with this audio data amount；And use one
Clock adjustor, adjusts this clock (step 530) according to control signal.
As it was previously stated, audio data in step 510 is the audio signal data of a sampling, delay
Rush processor can comprise a buffer is, for example, a first in first out (First In First out, FIFO)
Bin, receives the audio data through the transmission of USB (universal serial bus) receiving port in serial fashion, connects
Receive and store an audio data of a USB host transmission.Buffer also can comprise
One enumerator carrys out the capacity of the audio data of institute's buffer storage in count buffer bin, to produce sound
Frequency data quantity.
As it was previously stated, in step 520, controller is with the cycle of clock count frame beginning signal first
Time produces frame beginning count number S.Then controller 120 can be by frame beginning count number S and a ginseng
Examine count number R to compare, and edit one first weight W1.Wherein reference count amount is that reference frame begins to believe
Number count number, i.e. the frame beginning signal-count amount of main frame transmission.Wherein manner of comparison can be using for example
One comparator, to compare frame beginning count number S and reference count amount R.If S>R, then edit first
Weight W1 is+1.If S=R, editing the first weight W1 is 0.If S<R, then edit
First weight W1 is -1.If above-mentioned S>R, represents frame beginning count number S of this audio frequency frequency locking device
More than reference frame beginning signal-count amount R, the clock of this audio frequency frequency locking device is compared with the reference clock of main frame
Hurry up, if above-mentioned S<R, represents that frame beginning count number S of this audio frequency frequency locking device is less than reference frame and begins to believe
Number count number R, the clock of this audio frequency frequency locking device is slow compared with the reference clock of main frame.
Hold above-mentioned, then controller can be by audio data amount B and upper limit amount U and lower limit amount L
Relatively, edit one second weight W2.Wherein upper limit amount U and lower limit amount L are buffers
Upper limit amount U and lower limit amount L it is assumed for example that the capacity of buffer 310 is 4Mb (megabit
Unit), and edit upper limit amount U be 3Mb and lower limit amount L be 1Mb.Wherein manner of comparison can make
With such as comparator, to compare news data quantity B and to compare with upper limit amount U and lower limit amount L.If B
L, then editing the second weight W2 is+2.If U>B>L, then editing the second weight W2 is 0.
If B is U, editing the second weight W2 is -2.If above-mentioned B L, represent this audio data amount
Less than the lower limit of buffer capacity, in this buffer, audio data amount sends out relatively
Receive fast.If above-mentioned B U, this audio data amount is higher than the upper limit of buffer capacity, and this delays
Rush sending out of audio data amount in bin and relatively receive slowly.
Hold above-mentioned, last controller can produce control according to the first weight W1 and the second weight W2
Signal.Can be for example the first weight W1 and the addition number of the second weight W2 according to gross weight W,
I.e. W=W1+W2, to produce control signal.If such as W 0, produce control signal 132
An e.g. high potential.If W<0, then producing control signal 132 is, for example, an electronegative potential.
As it was previously stated, in step 530, clock adjustor 140 can receive above-mentioned middle total according to one
The control signal that weight W produces is, for example, high potential or electronegative potential to adjust this clock.Implementing model
In example, if the control signal that clock adjustor receives is high potential, represent this audio frequency frequency locking device
Clock is fast compared with the reference clock of main frame or/and transmission of audio data amount is very fast, then can adjust clock
Whole slow, to follow the reference clock of main frame and to reach the function of frequency locking.In implementing example,
If the control signal that clock adjustor receives is electronegative potential, represent the clock of this audio frequency frequency locking device relatively
The reference clock of main frame is slow or/and transmission of audio data amount is slower, then clock can be adjusted fast one
A bit, to follow the reference clock of main frame and to reach the function of frequency locking.
In sum, the present invention proposes a kind of technology proposing dynamic clock adjustment, with loop circuit control
Mode, via controller produce control signal carry out dynamic debugging system clock in time.
Only, above invented diagram and explanation, only presently preferred embodiments of the present invention, non-
It is the enforcement limiting the present invention, its institute's essence under this invention of described those skilled in the art
God, the change made or modification, all should cover the protection in the claims of the present invention enclosed
In the range of.
Claims (10)
1. a kind of device of USB (universal serial bus) audio frequency frequency locking, this device comprises：
One USB (universal serial bus) receiving port, the frame receiving a USB host transmission begins
Signal and an audio data；
One buffer, receives and stores the described of described USB (universal serial bus) receiving port transmission
Audio data, and an audio data amount is produced with audio data described in a clock count；
One controller, receives the described frame beginning signal of described USB (universal serial bus) receiving port transmission,
To produce a frame beginning count number cycle time of frame beginning signal described in described clock count, and root
To produce a control signal according to described frame beginning count number and described audio data amount；And
One clock adjustor, receives described control signal to adjust described clock.
2. device as claimed in claim 1, wherein said buffer comprises a buffer
Receive described audio data in serial fashion.
3. device as claimed in claim 1, wherein said buffer comprises a rolling counters forward
Described audio data is producing described audio data amount.
4. device as claimed in claim 1, described controller is by described frame beginning count number and a reference
Count number compares, and edits one first weight, and by described audio data amount and a upper limit amount and
One lower limit amount compares, and edits one second weight.
5. device as claimed in claim 4, wherein said controller is according to described first weight and institute
State the addition number of the second weight, to produce described control signal.
6. a kind of method of USB (universal serial bus) audio frequency frequency locking, methods described comprises:
Using a buffer, receive and store an audio frequency of a USB host transmission
Data, and an audio data amount is produced with audio data described in a clock count；
Using a controller, receive a frame beginning signal of described USB host transmission, with
The cycle time of frame beginning signal described in described clock count produces a frame beginning count number, and according to
Described frame beginning count number to produce a control signal with described audio data amount；And
Using a clock adjustor, adjust described clock according to described control signal.
7. method as claimed in claim 6, wherein said buffer uses a buffer
Receive described audio data in serial fashion.
8. method as claimed in claim 6, wherein said buffer uses a rolling counters forward
Described audio data is producing described audio data amount.
9. method as claimed in claim 6, described frame beginning count number is counted by methods described with a reference
Quantity compares, and edits one first weight, and by described audio data amount and a upper limit amount and
Lower limit amount compares, and edits one second weight.
10. method as claimed in claim 9, methods described is according to described first weight and described
The addition number of the second weight, to produce described control signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW104125004A TW201704923A (en) | 2015-07-31 | 2015-07-31 | Apparatus and method of USB audio frequency locking |
| TW104125004 | 2015-07-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106407157A true CN106407157A (en) | 2017-02-15 |
Family
ID=58008111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510511400.3A Pending CN106407157A (en) | 2015-07-31 | 2015-08-19 | Universal serial bus audio frequency locking device and method |
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| Country | Link |
|---|---|
| CN (1) | CN106407157A (en) |
| TW (1) | TW201704923A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112533046A (en) * | 2019-09-18 | 2021-03-19 | 新唐科技股份有限公司 | Audio data synchronization device and method thereof |
| CN113132044A (en) * | 2019-12-30 | 2021-07-16 | 新唐科技股份有限公司 | Audio synchronous processing circuit and method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112527237B (en) * | 2021-02-09 | 2021-06-25 | 深圳市创成微电子有限公司 | Audio interface circuit, control method thereof and audio equipment |
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|---|---|---|---|---|
| JPH11272295A (en) * | 1998-03-24 | 1999-10-08 | Kokusai Electric Co Ltd | Method and device for processing voice |
| TW200821910A (en) * | 2006-11-10 | 2008-05-16 | Tenor Electronics Corp | Data synchronization apparatus |
| CN102156683A (en) * | 2010-09-30 | 2011-08-17 | 威盛电子股份有限公司 | Universal serial bus transmission translator and micro-frame synchronization method |
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2015
- 2015-07-31 TW TW104125004A patent/TW201704923A/en unknown
- 2015-08-19 CN CN201510511400.3A patent/CN106407157A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11272295A (en) * | 1998-03-24 | 1999-10-08 | Kokusai Electric Co Ltd | Method and device for processing voice |
| TW200821910A (en) * | 2006-11-10 | 2008-05-16 | Tenor Electronics Corp | Data synchronization apparatus |
| CN102156683A (en) * | 2010-09-30 | 2011-08-17 | 威盛电子股份有限公司 | Universal serial bus transmission translator and micro-frame synchronization method |
| TWI451263B (en) * | 2010-09-30 | 2014-09-01 | Via Tech Inc | Usb transaction translator and a micro-frame synchronization method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112533046A (en) * | 2019-09-18 | 2021-03-19 | 新唐科技股份有限公司 | Audio data synchronization device and method thereof |
| CN113132044A (en) * | 2019-12-30 | 2021-07-16 | 新唐科技股份有限公司 | Audio synchronous processing circuit and method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201704923A (en) | 2017-02-01 |
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