CN100442375C - Digital audio signal modifiable audio signal processing circuit - Google Patents
Digital audio signal modifiable audio signal processing circuit Download PDFInfo
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- CN100442375C CN100442375C CNB031044980A CN03104498A CN100442375C CN 100442375 C CN100442375 C CN 100442375C CN B031044980 A CNB031044980 A CN B031044980A CN 03104498 A CN03104498 A CN 03104498A CN 100442375 C CN100442375 C CN 100442375C
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Abstract
The present invention relates to an audio signal processing circuit which comprises an analyzer, a bit stream buffer, an audio signal processor, a first buffer, an IEC burst circuit and a digital interface. The audio signal processing circuit uses the analyzer to read out data in a media, and temporarily stores the data in the bit stream buffer. The audio signal processor comprises a bit stream repair circuit which can be used for detecting a bit stream delivered by the bit stream buffer and repairing the bit stream to accord with a prearranged standard specification. Data after modified is temporarily stored in the first buffer, and a burst preamble added before stored in the data in the first buffer by the IEC burst circuit can be output by the digital interface.
Description
Technical field
The invention provides a kind of audio signal treatment circuit, especially refer to a kind of audio signal treatment circuit of revising digital audio signal (digital audio signal).Audio signal treatment circuit of the present invention can be used in the CD player.
Prior art
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of data burst (data-bursts) form of IEC 60958.IEC 61937 is for defining the modulation of Nonlinear Impulsive sign indicating number (pulse-code modulation, the PCM) interface specification of coding audio signal bit stream, and the specification of being somebody's turn to do coding audio signal bit stream use IEC 60958.The form of IEC 60958 interfaces is made up of a series of IEC 60958 subframes (subframe), and each IEC 60958 subframe is commonly used to transport Nonlinear Impulsive sign indicating number modulated pattern, but also may be used for transmitting data.Each subframe comprises data burst and fills up.Data burst size in the different subframes may be different, and the effect of filling up promptly be for the size of keeping each subframe be a particular value.Each data burst is made up of the preamble of bursting (burst-preamble) carrying capacity (burst-payload) of then bursting afterwards, the preamble of wherein bursting comprises the word of four 16 of Pa, Pb, Pc and Pd, Pa and Pb are that synchronization character, Pc are the related data of carrying capacity of bursting, Pc is the bit stream number, and the content of the carrying capacity of bursting is the data of coding audio signal frame.
Please refer to Fig. 2, Fig. 2 is the synoptic diagram of audio signal treatment circuit 10 structures in the known CD player.Audio signal treatment circuit 10 comprises an analyzer 12, one bit stream buffering devices 14, one audio signal processors 16, one second impact dampers 18, one digital/analog converters 20, one IEC burst circuit 22, and a digital interface 24.After one discs 26 is inserted CD player, through servomechanism (not shown) reading of data, the numerical data that analyzer 12 can will be read in the discs 26 is temporary in bit stream buffering device 14, then audio signal processor 16 is understood the numerical data decoding that will be stored in the bit stream buffering device 14 becomes the pulse code modulated coding, and decoded pulse code modulated coding is temporary in second impact damper 18, the pulse code modulated code conversion that will be stored in second impact damper 18 by digital/analog converter 20 becomes analog signal as output at last.Because the user may not want to use the audio signal treatment circuit of this CD player inside, and wish to use more professional decoding/enlarger device to do the processing of digital audio signal, therefore the audio signal treatment circuit of estimating in the CD player 10 is play the digital audio signal data in the discs 26 except above-mentioned decoding program is provided, and also can be connected to the decoding/enlarger device 28 of back level by digital interface 24.CD player is not decoded CD player, is changed and (for example: IEC 61937/IEC 60958 audio signal forms) afterwards convert specific digital audio signal form to by the digital audio signal data of being read in the discs 26 by digital interface 24, transfer to the decoding/enlarger device 28 of CD player outside, handle for 28 pairs of these numerical datas of decoding/enlarger device.Yet be transmitted in the specification that data between CD player and the decoding/enlarger device 28 must meet IEC 61937/IEC 60958 by digital interface 24, otherwise decoding/enlarger device 28 just can't be decoded to this numerical data, so when using digital interface 24 to connect CD player and decoding/enlarger device 28, bit stream buffering device 14 be read and be temporary in to numerical data in the discs 26 can by analyzer 12 earlier, for making the numerical data that exports digital interface 24 to become the specification of IEC 60958, numerical data in being stored in bit stream buffering device 14 is sent to before the digital interface 24, use IEC burst circuit 22 bit stream to be divided into the carrying capacity of bursting of suitable size, add the preamble of bursting, add filling up of suitable size, make original audio signal bit stream meet the specification of IEC 60958, export bit stream to decoding/enlarger device 28 via digital interface 24 again.
From the above, audio signal treatment circuit 10 can be earlier will be temporary among the bit stream buffering device 14 by the numerical data of reading in the discs 26, and the numerical data that is stored in bit stream buffering device 14 is temporary in second impact damper 18 after being decoded into the pulse code modulated coding by audio signal processor 16, re-uses the pulse code modulated code conversion that digital/analog converter 20 will be stored in second impact damper 18 and becomes analog signal output.In addition, CD player also can connect decoding/enlarger device 28 by the digital interface 24 of audio signal treatment circuit 10 inside, and the numerical data that is stored in bit stream buffering device 14 via IEC burst circuit 22 after each batch data becomes the specification of IEC 60958 through suitable treatment conversion, be sent to digital interface 24 and export decoding/enlarger device 28 to and decode and amplify signal.Yet IEC burst circuit 22 only is each batch data that directly will be stored in the bit stream buffering device 14 does format conversion, do not check the content of data itself, therefore not in full conformity with the data of digital music specification (for example: the audio signal bit stream of working out by not good enough audio signal encoding software, hardware) also can be same export decoding/enlarger device 28 to via digital interface 24, cause decoding/expansion instrument 28 to receive that generation when containing the data that meet the digital audio signal specification not to the utmost can't be decoded or the phenomenon of sonic boom.
Other relevant technology can be with reference to United States Patent (USP) 5,794, and 181, United States Patent (USP) 5,884,048, United States Patent (USP) 6,272,153, United States Patent (USP) 6,128,579, United States Patent (USP) 6,122,619.
Summary of the invention
Therefore fundamental purpose of the present invention provides a kind of device and method of revising digital audio signal, to address the above problem.
A kind of audio signal treatment circuit is provided in the preferred embodiment of the present invention, and it comprises an analyzer, is used for reading the raw data in the medium; One bit stream buffering device is connected in this analyzer, is used for keeping in the bit stream of this analyzer data streams read; One audio signal processor is connected in this bit stream buffering device, and this audio signal processor comprises a bit stream and repairs circuit, and being used for detecting the bit stream that is transmitted by this bit stream buffering device and it is repaired is to meet a predetermined standard specification; One first impact damper is connected in this audio signal processor, is used for keeping in the bit stream after this bit stream is repaired circuit modification; One IEC burst circuit is connected in this first impact damper, be used for bit stream be divided into suitable size the carrying capacity of bursting, add the preamble of bursting, add filling up of suitable size, make original audio signal bit stream meet the specification of IEC 60958; And a digital interface, be connected in this IEC burst circuit and be used for exporting the bit stream that transmits by this IEC burst circuit.
Description of drawings
Fig. 1 is the synoptic diagram of data burst (data-bursts) form of IEC 60958.
Fig. 2 is the synoptic diagram of known CD player structure.
Fig. 3 is the synoptic diagram of the CD player structure of the embodiment of the invention.
Fig. 4 is the process flow diagram of the audio signal treatment circuit correction bit stream of the use embodiment of the invention.
Fig. 5 changes the process flow diagram of the decoding process of decoding/enlarger device for the audio signal treatment circuit that uses the embodiment of the invention.
Fig. 6 checks the synoptic diagram of bit stream mistake for the audio signal treatment circuit that uses the embodiment of the invention.
The reference numeral explanation
10 known audio signal treatment circuit 12 analyzers
14 bit stream buffering devices, 16 audio signal processors
18 second impact dampers, 20 digital/analog converters
26 discs, 28 decoding/enlarger devices
The audio signal treatment circuit of 30 embodiment of the invention
32 audio signal processors, 34 decoding circuits
36 bit streams are repaired circuit 38 first impact dampers
Embodiment
Please refer to Fig. 3, Fig. 3 is in a preferred embodiment of the present invention, the synoptic diagram of CD player structure.For convenience of description, components identical has identical functions and uses identical label among Fig. 3 and Fig. 1.Audio signal treatment circuit 30 comprises an analyzer 12, one bit stream buffering devices 14, one audio signal processors 32, one second impact dampers 18, one digital/analog converters 20, one first impact dampers 38, one IEC burst circuit 22, and a digital interface 24.Audio signal processor 32 comprises a decoding circuit 34 and a bit stream is repaired circuit 36.After discs 26 is inserted audio signal treatment circuit 30, analyzer 12 can be read the numerical data in the discs 26 and be temporary in bit stream buffering device 14, then the decoding circuit 34 of audio signal processor 32 is understood the numerical data decoding that will be stored in the bit stream buffering device 14 becomes the pulse code modulated coding, and decoded pulse code modulated coding is temporary in second impact damper 18, the pulse code modulated code conversion that will be stored in second impact damper 18 by digital/analog converter 20 becomes analog signal as output at last.Present embodiment audio signal treatment circuit 30 equally also provides general decoding program to play digital audio signal data in the discs 26, but different with known technology is, when Disc player connects decoding/enlarger device 28, audio signal treatment circuit 30 uses the bit stream of audio signal processor 32 to repair circuit 36 earlier and checks, and reparation is stored in the numerical data in the bit stream buffering device 14, and will be by checking, or the data of repairing bit stream reparation circuit 36 inspections of finishing are temporary in first impact damper 38, put the form of digital audio signal data in order with IEC burst circuit 22 again, after making its specification that becomes IEC 60958, be sent to digital interface 24 outputs.
Please refer to Fig. 4, Fig. 4 is the process flow diagram that present embodiment audio signal treatment circuit 30 is revised bit stream.Each the batch data front that is stored in the bit stream buffering device 14 all can have synchronization character to be used as the separation of each batch data, do not make a mistake when data content and just produced displacement, when causing its form to fail to meet the digital audio signal specification requirement fully, if the synchronization character that does not go to check each batch data is just directly done data format conversion and output, may make decoding/enlarger device 28 decoding error take place and produce sonic boom.For example for the MPEG audio signal, synchronization character is the hyte of appointment, its value is 0xfff, above-mentioned for preventing to produce because of mistake that displacement produced, audio signal treatment circuit 30 is before being sent to IEC burst circuit 22 with data by bit stream buffering device 14, can use the bit stream reparation circuit 36 of audio signal processor 32 to check data earlier, more revised data are temporary in first impact damper 38, just do format conversion and output thereafter.
The step of checking is as follows:
Step 110: find out the synchronization character in the bit stream buffering device 14, and set index s ft=0, carry out step 120;
Step 120: check whether synchronization character is the hyte of appointment, is then carry out step 130, otherwise carry out step 140;
Step 130: the bit stream in the bit stream buffering device 14 is copied to first impact damper 38 and be offset sft position, finish this bit stream inspection,, carry out the inspection of next bit stream by step 110 beginning;
Step 140: set index s ft=sft+1, the side-play amount of a position is checked out in expression, carry out step 150;
Step 150: synchronization bit is moved to left behind the position, and most significant digit is cast out, and covers a lowest order, gets back to step 120.
Bit stream is after handling through above-mentioned steps, can eliminate incorrect displacement, bit stream after the inspection of the bit stream reparation circuit 36 of process audio signal processor 32 is temporary in first impact damper 38, and the form that uses IEC burst circuit 22 arrangement digital audio signal data at last is after transfer to decoding/enlarger device 28 by digital interface 24.Just can increase the compatibility between audio signal treatment circuit 30 and the decoding/enlarger device 28 thus.
Please refer to Fig. 5, Fig. 5 is for using in the second embodiment of the invention, and audio signal treatment circuit 30 changes the process flow diagram of the decoding process of decoding/enlarger device 28.In some cases, may be because the design of decoding/enlarger device 28 be bad, cause and correctly to decode the data that transmitted by audio signal treatment circuit 30, at this time audio signal treatment circuit 30 just can utilize the bit stream reparation circuit 36 of audio signal processor 32 to change the data content of reading by in the discs 26, makes that decoding/enlarger device 28 can operate normally.For example in the MPEG audio signal, there is one 2 field (field) to be called pattern (mode), pattern field is writing down the result of broadcast of this audio signal, usually can be divided into monophone (mono), alliteration (dual mono) and stereo (stereo) three kinds of patterns, wherein the monophone representative has only a sound channel that sound is arranged, alliteration with stereo then be that two sound channels are play different sound, make sound that stereoscopic sensation be arranged.Partial decoding of h/enlarger device 28 is identification alliteration pattern correctly, though therefore those decodings/enlarger device 28 can correctly be play the monophone pattern with monophony, play stereo mode with two-channel, but when pattern field is alliteration, but often play with monophony, the user is easy to feel that CD player and this decoding/enlarger device 28 have the problem of compatibility.Audio signal treatment circuit 30 in the present embodiment can use the bit stream reparation circuit 36 of audio signal processor 32 to be made into stereo by alliteration from the pattern field in discs 26 data, thus, these decoding/enlarger devices 28 just can be play discs 26 data of alliteration with two-channel.Because the decoding/enlarger device 28 of the overwhelming majority can correctly identification two-channel pattern, therefore via the digital audio signal processing of present embodiment, the compatibility between this CD player and the various decoding/enlarger device 28 has just obtained improvement.The step that the bit stream of audio signal processor 32 is repaired circuit 36 change pattern field is as follows:
Step 210: find out the synchronization character of data bit stream in the bit stream buffering device 14, synchronization character is copied in first impact damper 38;
Step 220: the acquisition bit stream is up to the field that finds pattern, and the data storage that will be obtained by bit stream buffering device 14 is in first impact damper 38;
Step 230: analyze data from pattern field in the bit stream buffering device 14;
Step 240: change original pattern and become new pattern, new mode data is stored in first impact damper 38;
Step 250: capture remaining bit stream and finish up to bit stream, the data storage that will be obtained by bit stream buffering device 14 is in first impact damper 38.
Except the change pattern field, the bit stream of audio signal processor 32 is repaired circuit 36 and also can be used in the management of copyright, and general copyright can be divided into not reproducible (no copy), reproducible (copyalways) and reproducible once (copy once).When the Copyright field of discs 26 when not reproducible, discs 26 only can be used for reading broadcast.When the Copyright field of discs 26 when being reproducible, then discs 26 can be replicated use.When if the Copyright field of discs 26 is reproducible one time, then after duplicating use for the first time, the bit stream of audio signal processor 32 is repaired circuit 36 and the Copyright field will be modified to not reproducible.
Please refer to Fig. 6, Fig. 6 is in the third embodiment of the invention, and audio signal treatment circuit 30 is checked the synoptic diagram of bit stream mistake.Another function that the bit stream of audio signal processor 32 is repaired circuit 36 check exactly whether contain in the data bit stream wrong, audio signal treatment circuit 30 operational analysis devices 12 with the data in the discs 26 read be temporary in bit stream buffering device 14 after, bit stream is repaired circuit 36 and will each field in the data bit stream wherein be conducted a survey, as shown in Figure 6, at first find out the synchronization character of bit stream, then check head (header) item by item, satellite information (side information), scale factor (scale factor), audio signal sample (audio sample), and supplementary data fields such as (ancillary data), when the data content of checking out any one field contains when wrong, bit stream is repaired circuit 36 and can be attempted repairing, if repairing successfully, the back just is temporary in data in first impact damper 38, then continue to check next field, if can't repair success, then give up this batch data bit stream and begin the inspection of next group data bit stream, in other words, bit stream is repaired circuit 36 and can not allowed and anyly contain wrong data and pass through, because for decoding/enlarger device 28, and the impression of listening to of considering the user, data are lost caused noiseless, and to come slightly than sonic boom that error in data caused to the influence of sound quality many.
From the above, audio signal treatment circuit 30 of the present invention is play the numerical data in the discs 26 except general decoding program is provided, and in audio signal processor 32, add bit stream and repair circuit 36, be used for handling the numerical data that is temporary in the bit stream buffering device 14, comprise the displacement of revising bit stream, revise the data content in the bit stream, functions such as data content in the inspection bit stream and trial reparation, data in the bit stream buffering device 14 are repaired through the bit stream of audio signal processor 32 and are temporary in first impact damper 38 after circuit 36 is handled, add the specification that the preamble of bursting becomes IEC 60958 by IEC burst circuit 22 again, by digital interface 24 with data transmission to decoding/enlarger device 28, so can increase the compatibility between audio signal treatment circuit 30 and the decoding/enlarger device 28.
Compare with known technology, known audio signal treatment circuit is when using digital interface to be connected to decoding/enlarger device, directly the digital data conversion of using the IEC burst circuit will be stored in the bit stream buffering device becomes the specification of IEC 60958, export decoding/enlarger device to by digital interface with that, because the IEC burst circuit is not checked the content that is stored in numerical data in the bit stream buffering device, cause contain wrong, or also be transferred into decoding/enlarger device not in full conformity with the data of specification, cause decoding/the enlarger device can't decode or produce the phenomenon of sonic boom.Audio signal treatment circuit of the present invention is when using digital interface to be connected to decoding/enlarger device, can use the bit stream reparation circuit of audio signal processor to handle the data in the bit stream buffering device and be temporary in first impact damper earlier, the data-switching that will be stored in first impact damper by the IEC burst circuit becomes the specification of IEC 60958 again, so can remove and contain wrong data bit stream or revise the audio signal data of script not in full conformity with specification, make that decoding/enlarger device can be correct to the digital audio signal data decode, increase compatibility.
The above only is preferred embodiment of the present invention, and all equivalences of making according to claims of the present invention change and revise, and all should belong to covering scope of the present invention.
Claims (19)
1. audio signal treatment circuit, be used for producing one second bit stream that meets a digital interface standard specification according to one first bit stream, this first bit stream has many group digital datas, and each group digital data has a plurality of fields, and this audio signal treatment circuit includes:
One bit stream buffering device is used for the numerical data of temporary this first bit stream;
One bit stream is repaired circuit, is connected in this bit stream buffering device, is used for detecting at least one field of these a plurality of fields in these many group digital datas and at least one field of revising these a plurality of fields according to a predetermined standard specification;
One first impact damper is connected in this bit stream and repairs circuit, is used for keeping in the numerical data after this bit stream is repaired circuit modification; And
One IEC burst circuit is connected in this first impact damper, is used for that those amended numerical datas are divided into a plurality of burst carrying capacity and each carrying capacity of bursting and adds the preamble of bursting, to form this second bit stream.
2. audio signal treatment circuit as claimed in claim 1 should predetermined standard specification be the MPEG audio signal wherein.
3. audio signal treatment circuit as claimed in claim 1, wherein this first bit stream is obtained by reading a CD.
4. audio signal treatment circuit as claimed in claim 1, it also includes:
One decoding circuit is connected in this bit stream buffering device, is used for the bitstream decoding that transmits by this bit stream buffering device;
One second impact damper is connected in this decoding circuit, is used for keeping in the bit stream that this decoding circuit decoding produces; And
One digital/analog converter is connected in this second impact damper, and the bit stream translation that is used for being transmitted by this second impact damper is an analog signal.
5. audio signal treatment circuit as claimed in claim 4, wherein this decoding circuit and this bit stream are repaired circuit by an audio signal processor that comprehensively is this audio signal treatment circuit.
6. audio signal treatment circuit, be used for producing one second bit stream that meets a digital interface standard specification according to one first bit stream, this first bit stream has many group digital datas, each group digital data has a plurality of fields, these a plurality of fields have a synchronization character field, and this audio signal treatment circuit includes:
One bit stream buffering device is used for the numerical data of temporary this first bit stream;
One bit stream is repaired circuit, be connected in this bit stream buffering device, be used for finding out near the desired location of the synchronization character field in these many group digital datas the synchronization character in these many group digital datas and revise these many group digital datas according to the physical location of the synchronization character of having found out;
One first impact damper is connected in this bit stream and repairs circuit, is used for keeping in the numerical data after this bit stream is repaired circuit modification; And
One IEC burst circuit is connected in this first impact damper, is used for those amended numerical datas are divided into a plurality of carrying capacity and add the preamble of bursting on each bursts carrying capacity of bursting, to form this second bit stream.
7. audio signal treatment circuit as claimed in claim 6, wherein this first bit stream is obtained by reading a CD.
8. audio signal treatment circuit as claimed in claim 6, it also includes:
One decoding circuit is connected in this bit stream buffering device, is used for the bitstream decoding that transmits by this bit stream buffering device;
One second impact damper is connected in this decoding circuit, is used for keeping in the bit stream that this decoding circuit decoding produces; And
One digital/analog converter is connected in this second impact damper, and the bit stream translation that is used for being transmitted by this second impact damper is a simulating signal.
9. audio signal treatment circuit as claimed in claim 8, wherein this decoding circuit and this bit stream are repaired circuit by an audio signal processor that comprehensively is this audio signal treatment circuit.
10. one kind is used for producing according to one first bit stream the method for one second bit stream meet a digital interface standard specification, and this first bit stream has many group digital datas, and each group digital data has a plurality of fields, and this method includes:
(a) detect at least one field of these a plurality of fields in these many group digital datas and at least one field of revising these a plurality of fields according to a predetermined standard specification; And
(b) those amended numerical datas are divided into a plurality of carrying capacity and add the preamble of bursting of bursting, to form this second bit stream in each carrying capacity of bursting.
11. method as claimed in claim 10, wherein this first bit stream is obtained by reading a CD.
12. method as claimed in claim 10 should predetermined standard specification be the MPEG audio signal wherein.
13. method as claimed in claim 10, it also includes:
The decode numerical data of this first bit stream; And
With decoded digital data conversion is simulating signal.
14. method as claimed in claim 10, wherein step (a) also includes:
If have any skew in the numerical data of this first bit stream, then cast out at least one position, be to meet this predetermined standard specification with this first bit stream reparation of river.
15. method as claimed in claim 10, wherein step (a) also includes:
Change a field of set of number data in the numerical data of this first bit stream, being to meet this predetermined standard specification with this first bitstream modification.
16. method as claimed in claim 15, wherein reformed field are to be a copyright management field.
17. method as claimed in claim 15, wherein this reformed field is to be an audio signal pattern field.
18. method as claimed in claim 10, wherein step (a) also includes:
If exist in the numerical data of this first bit stream and anyly can't then give up at least one error bit, being to meet this predetermined standard specification with this first bit stream reparation according to the error bit of this predetermined standard specification reparation success.
19. method as claimed in claim 10, wherein step (a) also includes:
Revise the mistake in the field of numerical data of this first bit stream, being to meet this predetermined standard specification with this first bit stream reparation.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1179870A (en) * | 1995-12-07 | 1998-04-22 | 菲利浦电子有限公司 | Method and device for encoding, transferring and decoding non-PCM bitstream between digital versatile disc device and multi-channel reproduction apparatus |
| KR20020089838A (en) * | 2001-05-24 | 2002-11-30 | 주식회사 하이닉스반도체 | Apparatus for contrrol of Pulse Code Modulation data and method using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1179870A (en) * | 1995-12-07 | 1998-04-22 | 菲利浦电子有限公司 | Method and device for encoding, transferring and decoding non-PCM bitstream between digital versatile disc device and multi-channel reproduction apparatus |
| KR20020089838A (en) * | 2001-05-24 | 2002-11-30 | 주식회사 하이닉스반도체 | Apparatus for contrrol of Pulse Code Modulation data and method using the same |
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