CN110138768A - A kind of Digital Audio Transmission method based on FPGA - Google Patents
A kind of Digital Audio Transmission method based on FPGA Download PDFInfo
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- CN110138768A CN110138768A CN201910389578.3A CN201910389578A CN110138768A CN 110138768 A CN110138768 A CN 110138768A CN 201910389578 A CN201910389578 A CN 201910389578A CN 110138768 A CN110138768 A CN 110138768A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005194 fractionation Methods 0.000 claims abstract description 5
- 241001269238 Data Species 0.000 claims description 21
- 238000012546 transfer Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 230000035515 penetration Effects 0.000 abstract description 3
- 230000008092 positive effect Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 4
- 230000005236 sound signal Effects 0.000 description 3
- 230000006837 decompression Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/0017—Lossless audio signal coding; Perfect reconstruction of coded audio signal by transmission of coding error
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/16—Vocoder architecture
- G10L19/167—Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/75—Media network packet handling
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computational Linguistics (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Computer Networks & Wireless Communication (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The Digital Audio Transmission method based on FPGA that the invention discloses a kind of, no compressed encoding transmission is carried out after the number of significant digit of audio data is split using one byte of streaming transparent transmission mode, one byte, and it is consistent to guarantee that transmitting-receiving rate, number of significant digit and the data of receiving and dispatching two sides split combination.Compared with prior art, the positive effect of the present invention is: in data transmission procedure, loss of data is lost as unit of a byte, there is no the case where continuous mass data loss to exist, meanwhile data transmit real-time perfoming, reduce the delay waiting time that data are packaged in transmission process.Therefore carried out data transmission using data penetration transmission form, agreement is simple, without compression.Audio data real-time is high, and continuity is good, as long as guaranteeing that the transmitting-receiving rate of two sides of transmitting-receiving, number of significant digit, data fractionation combination are consistent, can be carried out the transmission of audio data, transmission is simple, reliable.
Description
Technical field
The Digital Audio Transmission method based on FPGA that the present invention relates to a kind of.
Background technique
With the development of modern communications and Digital Electronic Technique, transmission range is close, poor anti jamming capability analogue audio frequency letter
Number transmission mode has been no longer desirable for the processing requirement of contemporary audio signal.The transmission of digital audio and video signals and processing are comprehensive
Instead of original analog audio signal processing mode.Wherein, the transmission mode of digital signal mainly includes network audio transmission
(CobraNet, Dante, Ethernet AVB etc.), SLIP agreement transmission etc..
Wherein, network audio transport protocol presses digital audio and video signals mainly based on TCP/IP network protocol
It is transmitted as a data frame after reducing the staff code.The transmission of SLIP agreement is also in the form of data packet to wrap voice data stream one
One packet is packaged to be sent again, and data packet is reduced to voice data stream again with the protocol format parsing arranged by recipient.
The transmission that voice data stream is carried out by TCP/IP network protocol, will carry out the segmentation of packets of audio data, audio number
According to compressed encoding and decompression.Data packet, in case of packet loss phenomenon, will be as unit of a segment of audio in transmission process
It loses, if packet loss will seriously influence whether system speech quality, while the compressed encoding of audio data and decompression will account for
With a large amount of resource, relatively high requirement is proposed to hardware processor resource.It is assisted using the transmission of such as SILP agreement one kind
View, audio data are also a transmission audio data wrapped as a data frame, also will be in case of packet loss phenomenon with
One section is lost for unit, and the packing and reduction of data need to formulate corresponding protocol etc..
Summary of the invention
The shortcomings that in order to overcome the prior art, the Digital Audio Transmission method based on FPGA that the present invention provides a kind of are got rid of
Abandoned it is traditional carried out as unit of audio data frame be packaged transmission in the way of, use in a manner of voice data stream without compression
Transmission.
The technical scheme adopted by the invention is that: a kind of Digital Audio Transmission method based on FPGA, by audio data
Number of significant digit carries out no compressed encoding transmission using one byte of streaming transparent transmission mode, one byte after splitting, and guarantees to receive and dispatch two sides
Transmitting-receiving rate, that number of significant digit and data split combination is consistent.
Compared with prior art, the positive effect of the present invention is: in data transmission procedure, loss of data is with a byte
For unit loss, there is no the case where continuous mass data loss to exist, meanwhile, data transmit real-time perfoming, reduce number
According to the delay waiting time being packaged in transmission process.Therefore carried out data transmission using data penetration transmission form, agreement is simple, without pressure
Contracting.Audio data real-time is high, and continuity is good, as long as guaranteeing that the transmitting-receiving rate of two sides of transmitting-receiving, number of significant digit, data split combination
Mode is consistent, just can be carried out the transmission of audio data, and transmission is simple, reliable.
Detailed description of the invention
Examples of the present invention will be described by way of reference to the accompanying drawings, in which:
Fig. 1 is that 16 audio datas of the invention are converted to the format after two byte datas；
Fig. 2 is that the high byte of 16 audio datas of the invention indicates；
Fig. 3 is that the low byte of 16 audio datas of the invention indicates.
Specific embodiment
A kind of Digital Audio Transmission method based on FPGA, since audio data is to be carried out in the form of data flow without compression
Transmission, therefore can be realized the processor of parallel processing suitable for FPGA etc, for serial processor, during realizing
It needs the execution of continuous interrupt process and goes to carry out data receiver, therefore and be not suitable for.
In usual digital audio data stream, the low level of each audio data is invalid data position, can directly be given up.
The audio data of one sixteen bit, its low four are invalid data positions, can directly be given up.One 24
Audio data, its low six are usually invalid data positions.Since serial data is usually to carry out data as unit of eight
Transmission.And it is basic unit that digital audio-frequency data, which is usually sixteen bit, 24 or 32,.Therefore it needs them
Two, three or four eight bit datas are split as, in order to serial ports transmission.It is split simultaneously in order to distinguish in data stream transmission process
The high and low byte order of eight bit data afterwards, finds upper byte, convenient for reconfiguring the audio data being split.By audio
The inactive low data bit of data is removed, and sixteen bit audio data removes low two, 24 audio datas remove low three,
32 audio datas remove low four.Then they are split as multiple bytes.The highest order of first character section is mended simultaneously
1, the highest order of remaining byte mends 0, is then successively transmitted by serial ports.In data receiver, it is firstly received highest order
For 1 first character section, this by be an audio data first section word.If 16 audio datas, then next data
Highest order be 0.If 24 audio datas, then the highest order of two bytes is 0 below, if 32 audio numbers
According to then the highest order of three bytes is 0 below.If being unsatisfactory for this sequence, illustrate occur in DRP data reception process
Word phenomenon needs to give up the audio data and transfers to receive next audio data, receives and differentiates that next byte highest order is
No is 1.When having received multiple bytes of an audio data, they are reconfigured, removes each byte most
Then rear seven hyte of each byte is combined together by a high position, if sixteen bit audio data, then low level mends two 0, if two
14 audio datas, then low level mends three 0, if 32 audio datas, then low level mends four 0.
It now is illustrated data transfer mode by taking the voice data stream as unit of significance bit is sixteen bit as an example, with 24
Position or 32 audio data transmission modes for unit do similar Data expansion.Minimum two of audio data are removed,
Number of significant digit is reduced to 14.Audio sample digit rate uses 32Kbps, transmits 14 audio data significance bits.By 14 data
It is divided into two 7 data transmission, two 7 data are divided into high low byte and send.The expression of high byte uses high position MSB for 1,
The expression of low byte uses high position MSB to identify for 0.High byte transmits the 16th to the 10th of 14 audio datas, low word
The 9th to the 3rd of section 14 audio datas of transmission.
It is as shown in Figure 1 that 16 audio datas are converted to the format after two byte datas；The high byte of 16 audio datas
Indicate as shown in Figure 2；The low byte of 16 audio datas indicates as shown in Figure 3, in which: H indicates that high byte is indicated with 1, and L is indicated
Low byte is indicated with 0.
Serial interface agrees as follows:
A) highest order MSB is first sent out；
B) baud rate: 921600bps；
C) start bit 1, data bit 8, stop position 1.
Audio data transmission is carried out by the way of data penetration transmission, it is ensured that the real-time of audio signal, data transmission
Loss in the process is few.
The transmission mode that the present invention uses is the streaming transparent transmission mode of audio data, and the transmission mode is by audio data one
One byte of byte is transmitted, and is different from traditional data and is packaged, transmission side data one by one in the form of data frames
Formula.Streaming is used, audio data number of significant digit is carried out without compression transparent transmission mode and carries out fractionation biography in a manner of the fractionation voluntarily arranged
Defeated, audio data real-time is high, and continuity is good, as long as guaranteeing that the transmitting-receiving rate of two sides of transmitting-receiving, number of significant digit, data split combination
Mode is consistent, just can be carried out the transmission of audio data.
Claims (8)
1. a kind of Digital Audio Transmission method based on FPGA, it is characterised in that: adopted after splitting the number of significant digit of audio data
The transmission of no compressed encoding is carried out with one byte of streaming transparent transmission mode, one byte, and guarantees to receive and dispatch the transmitting-receiving rate, effectively of two sides
Digit is consistent with data fractionation combination.
2. a kind of Digital Audio Transmission method based on FPGA according to claim 1, it is characterised in that: the audio number
According to number of significant digit be digit after removing inactive low data bit, in which: the number of significant digit of sixteen bit audio data is to remove
14 after low two, the number of significant digit of 24 audio datas is 21 removed after low three, 32
The number of significant digit of audio data is 28 removed after low four.
3. a kind of Digital Audio Transmission method based on FPGA according to claim 2, it is characterised in that: to audio data
The mode that is split of number of significant digit are as follows: the number of significant digit of sixteen bit audio data is split as two bytes, by 24
The number of significant digit of position audio data is split as three bytes, and the number of significant digit of 32 audio datas is split as three words
Section.
4. a kind of Digital Audio Transmission method based on FPGA according to claim 3, it is characterised in that: after fractionation
The mode that data are transmitted are as follows: the highest order of first character section is mended 1, the highest order of remaining byte mends 0, then passes through serial ports
Successively transmitted.
5. a kind of Digital Audio Transmission method based on FPGA according to claim 4, it is characterised in that: serial interface is about
It is fixed as follows:
A) highest order MSB is first sent out；
B) baud rate: 921600bps；
C) start bit 1, data bit 8, stop position 1.
6. a kind of Digital Audio Transmission method based on FPGA according to claim 1, it is characterised in that: debit is carrying out
When data receiver, it is first determined whether meeting following sequence: the highest order of the first section word received is 1 and remaining byte
Highest order is zero；Transfer to receive and differentiate next audio data if not satisfied, then giving up the audio data.
7. a kind of Digital Audio Transmission method based on FPGA according to claim 6, it is characterised in that: when having received one
When multiple bytes of a audio data, remove the highest order of each byte, then by rear seven bit combination of each byte to one
It rises, and the inactive low data bit removed is mended 0.
8. a kind of Digital Audio Transmission method based on FPGA according to claim 7, it is characterised in that: the low level without
Imitate the mode that data bit mends 0 are as follows: if sixteen bit audio data, then low level mends two 0, if 24 audio datas, then
Low level mends three 0, if 32 audio datas, then low level mends four 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910389578.3A CN110138768A (en) | 2019-05-10 | 2019-05-10 | A kind of Digital Audio Transmission method based on FPGA |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910389578.3A CN110138768A (en) | 2019-05-10 | 2019-05-10 | A kind of Digital Audio Transmission method based on FPGA |
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| CN110138768A true CN110138768A (en) | 2019-08-16 |
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| CN201910389578.3A Pending CN110138768A (en) | 2019-05-10 | 2019-05-10 | A kind of Digital Audio Transmission method based on FPGA |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030187662A1 (en) * | 2001-10-04 | 2003-10-02 | Alex Wilson | System, method, and article of manufacture for a reconfigurable hardware-based audio decoder |
| CN102497247A (en) * | 2011-11-22 | 2012-06-13 | 中兴通讯股份有限公司 | Multimedia stream transmission method and device thereof |
| CN107809252A (en) * | 2017-10-28 | 2018-03-16 | 徐慧民 | A kind of new 24 adpcm audio compressing/decompressing methods |
-
2019
- 2019-05-10 CN CN201910389578.3A patent/CN110138768A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030187662A1 (en) * | 2001-10-04 | 2003-10-02 | Alex Wilson | System, method, and article of manufacture for a reconfigurable hardware-based audio decoder |
| CN102497247A (en) * | 2011-11-22 | 2012-06-13 | 中兴通讯股份有限公司 | Multimedia stream transmission method and device thereof |
| CN107809252A (en) * | 2017-10-28 | 2018-03-16 | 徐慧民 | A kind of new 24 adpcm audio compressing/decompressing methods |
Non-Patent Citations (2)
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Application publication date: 20190816 |