CN100466729C - Method and apparatus for searching next signal frame synchronous character in digital coding signal - Google Patents

Method and apparatus for searching next signal frame synchronous character in digital coding signal Download PDF

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Publication number
CN100466729C
CN100466729C CNB2003101179504A CN200310117950A CN100466729C CN 100466729 C CN100466729 C CN 100466729C CN B2003101179504 A CNB2003101179504 A CN B2003101179504A CN 200310117950 A CN200310117950 A CN 200310117950A CN 100466729 C CN100466729 C CN 100466729C
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digitally encoded
signal frame
signal
search
encoded signal
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CN1622623A (en
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徐建华
林宗瑶
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MediaTek Inc
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MediaTek Inc
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    • Y10S370/903—Osi compliant network
    • Y10S370/906—Fiber data distribution interface, FDDI
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Abstract

The present invention is method and device for searching the sync character of the next signal frame in digital code signal. The digital code signal consists of several signal frames of different sizes, and each of the signal frames includes one sync character. The method includes the following steps: a) determining one search area for searching the sync character of the next signal frame with one inquiry list; and b) searching specific data mode within the search arean of the digital code signal to find out the sync character of the next signal frame.

Description

In digitally encoded signal, seek the method and the device of next signal frame synchronization character
Technical field
The present invention relates to a kind of method and relevant apparatus, be used in digitally encoded signal, seeking the synchronization character of next signal frame, to determine the length of this digitally encoded signal one present signal frame, be particularly related to a kind of look-up table that uses, determine a Search Area, and back search the method and the relevant apparatus of this synchronization character of this next signal frame at this Search Area.This look-up table can draw by experiment statistics.
Background technology
Flourish along with multimedia technology; there is the sound processing standard of more and more multiple digital form to be suggested successively; such sound processing standard usually can with image or acoustic information be encoded into digitally encoded signal (encoded digital signal), to transmit or the work that stores.
For instance, the defined audio standard of mpeg (MPEG) (audio standard) is exactly a kind of standard (for example ISO/IEC 11172-3 and ISO/IEC13818-3) that is used for processing audio signal.And the defined Audio Processing standard of MPEG can be divided into three layers, is respectively the mpeg audio standard (wherein the 3rd layer mpeg audio standard can be described as MP3 again) of ground floor (layer 1), the second layer (layer 2) and the 3rd layer (layer 3).Briefly, the digitally encoded signal of mpeg audio is made up of the unfixed signal frame of a plurality of length (frame) usually, and Fig. 1 has shown the form of the signal frame of three layers of different mpeg audio prescribed by standard.Though the mpeg audio standard code of different layers different signal frame forms, three layers title bar then has identical form, as shown in Figure 2.
The audio standard of MPEG is to have worked out as how different sampling rate (sampling rate) and bit rate (bit rate) to come audio signal is compressed and decompression.For some specific sampling rate and bit rate, have different length signal frame can be used to reach average bit rate.Because signal frame can have different length,, just there is way to carry out correct decoding so when digitally encoded signal is deciphered, must understand the real length of each signal frame earlier.At United States Patent (USP) the 5th, 777, in No. 992 the patent case, promptly disclosed a kind of method that is used for calculating the length of present signal frame (current frame), summary say that it has been to use following formula:
P = Br N × n S F S
Wherein, P is the number of the signal groove (slot) that comprised for present signal frame, Br is the bit rate (bit rate) for digitally encoded signal, N is the figure place that is comprised for a signal groove, ns is a sample number that signal frame comprised, and Fs then is the sampling rate (sampling rate) of digitally encoded signal.
When the employed decoder of prior art is receiving present signal frame in the above-mentioned digitally encoded signal, decoder can use above-mentioned formula to calculate the length of this present signal frame earlier, just can carry out follow-up decoding work of treatment to this present signal frame then.When the P that uses formula to calculate is integer, promptly represented to include P signal groove in the present signal frame; As for when the P that calculates is not integer, then represented and to have included individual or the P '+1 signal groove (wherein P ' is a maximum positive integer less than P) of P ' in the present signal frame, in order correctly digitally encoded signal to be deciphered, decoder must be judged and include individual still the P '+1 signal groove of P ' in the present signal frame actually.
For instance, in the title bar in the MPEG digitally encoded signal, include a field that is called " extension bit " (padding bit), in order to the length of index signal frame.When the P that uses said method to calculate was not integer, the decoder of prior art promptly must be inspected the information that extension bit comprises, if extension bit is 0, promptly represented to include the individual signal groove of P ' in the present signal frame; If extension bit is 1, promptly represent to include P '+1 a signal groove in the present signal frame.That is to say that the decoder of prior art must use above-mentioned formula to calculate the value of P in advance, then by checking that extension bit draws the length of present signal frame.
And in digitally encoded signal, in the title bar of each signal frame, all can comprise so-called " synchronization character " (syncword) usually, for the convenience in the identification, such synchronization character can have predetermined data type sample (data pattern) usually.Digitally encoded signal with mpeg audio is an example, and the data type sample of synchronization character is 1,111 1,111 1111 (two the forms) that are fixed as, i.e. 0xFFF (form of sixteen bit).And prior art system can be searched fixing data type sample (promptly searching 0xFFF) by begin forward (forward) from present signal frame, to find out the synchronization character in next signal frame (next frame), by the difference of position between synchronization character in the present signal frame of calculating and the synchronization character in next signal frame, obtain the length of present signal frame again.
A variety of mpeg audio encoders are arranged on the market, and some not necessarily can come coding audio data according to the regulation of mpeg audio form fully.According to the regulation of mpeg audio form, aforesaid special data type sample can only be used among the synchronization character, can not appear at other position of signal frame.Yet in the digitally encoded signal of the regulation of mpeg audio form, predetermined data type sample may not be certain only can appear in the synchronization character, also might appear at other place of signal frame at some.For instance, be to use ' 0 ' to be used as filler (stuffing bit) in the mpeg audio, and padding sequence (stuffingsequence) will be " 0000... ", ' 1 ' is used as filler but the encoder that has uses, this moment, padding sequence will be " 1111... ", and might be mistaken as synchronization character.So it is also inapplicable in some cases to seek the tentation data type sample that synchronization character has with the preceding mode of searching.
Summary of the invention
Therefore the present invention proposes does not a kind ofly need with reference to extension bit.
Another object of the present invention is to provide a kind of can not calculate by formula, can determine the method and the relevant apparatus of the position of the synchronization character of next signal frame in the digitally encoded signal.
According to an aspect of the present invention, be to disclose a kind of method that is used in a digitally encoded signal, seeking a synchronous character in next signal frame, include a plurality of signal frames in this digitally encoded signal, all include this synchronization character in each signal frame, this method includes following steps: (a) use a look-up table, determine a Search Area; And (b) in this Search Area in this digitally encoded signal, find out this synchronization character of this next signal frame.
According to another aspect of the present invention, be to disclose a kind of device that is used in a digitally encoded signal, seeking the synchronization character in next signal frame, include a plurality of signal frames in this digitally encoded signal, all include this synchronization character in each signal frame, this device includes: a buffer is used for receiving this digitally encoded signal; One search module, be coupled in this buffer, be used for determining the Search Area that desire is searched this synchronization character of this next signal frame according to a look-up table, and in this Search Area in this digitally encoded signal, find out this synchronization character of this next signal frame.
Description of drawings
Fig. 1 is the form of the signal frame of three layers of different mpeg audio prescribed by standard.
Fig. 2 is the form of the title bar shared of three layers of different mpeg audio standard.
Fig. 3 is the embodiment flow chart of the inventive method.
Fig. 4 is for adding up an example of the look-up table that draws for the standard test of the 3rd layer of mpeg audio.
Fig. 5 is the embodiment schematic diagram of apparatus of the present invention.
The reference numeral explanation
500 devices
510 first buffers
520 search module
530 header detector
550 read-only memorys
570 search devices
600 decoders
610 second buffers
620 multiplexers
630 decoding modules
Embodiment
To be example below, illustrate method proposed by the invention and relevant apparatus with the mpeg audio.See also Fig. 3, Fig. 3 is the embodiment flow chart of the inventive method, below will sketch each step among Fig. 3.
Step 310: read a bit rate index in the present signal frame in this digitally encoded signal ((Bit_rate_index, BRI)) and a sampling rate index ((Sampling_rate_index, FSI).In mpeg audio, this bit rate index and this sampling rate index can appear at the interior fixed position of title bar in each signal frame.
Step 320: use a look-up table (lookup table), determine a Search Area corresponding to this bit rate index and this sampling rate index.Fig. 4 has shown the example of a look-up table that draws for the standard test statistics of the 3rd layer of mpeg audio, and the Search Area of this look-up table is to represent with signal groove (Slot) number that begins to count with present signal frame original position.For instance, " starting position: 106; end position: 104 " represents that promptly Search Area starts from the present signal frame place of starting and counts the 106th signal groove, and ends at the present signal frame place of starting and count the 104th signal groove, that is includes the 104th, 105,106 these three signal grooves.Though herein only with audio standard (the MPEG Audio Layer3 of the 3rd layer of MPEG, MP3) be example, in fact for the digitally encoded signal of any preassigned, knowing the operator can be at an easy rate by the mode of testing, statistics draws the look-up table of similar Fig. 4, then not necessarily will be as for the look-up table that is counted with bit rate index and the sampling rate index foundation when searching, foundation in the time of can also using the out of Memory conduct to search, for instance, (the advancedaudio coding that " advances the rank audio coding ", AAC, ISO/IEC 13818-7) defined " signal hurdle length " field (framelength) promptly is a kind of spendable foundation of searching in.
Step 330: in this Search Area in this digitally encoded signal, use the mode of (backward) search back, find out the synchronization character of this next signal frame.In addition, cause erroneous judgement (this kind situation may occur in some and be used as in the digitally encoded signal of filler with ' 1 ') for fear of in this Search Area, searching plural tentation data type sample, can be with the synchronization character of first tentation data type sample (for example ' 1,111 1,111 1111 ') that coincide decision that finds in the process of back searching for searching.Need to prove, in the present embodiment, using the mode of back searching mainly is to avoid thinking the employed padding sequence of some encoder by mistake synchronization character, if considering of no this respect, system designer then can be decided desire in its sole discretion and adopt the mode of searching or searching backward forward, finds out the synchronization character on this time signal hurdle in this Search Area.
As before described, be to use the experiment method statistics to draw at the look-up table that Fig. 4 gave an example, for each group sampling rate index and bit rate index, look-up table among Fig. 4 has all been listed a Search Area, includes a starting position and an end position (being that " back " searched to end position from the starting position in step 330).And in fact system designer when counting look-up table with experiment method, any Search Area in the look-up table can also be defined as from some positions, the distance of N position (N is a natural number) forward or back, and the starting position and the end position of each Search Area of not necessarily having wanted definition clear and definite in the image pattern 4.
See also Fig. 5, Fig. 5 is the embodiment schematic diagram of apparatus of the present invention.In the present embodiment, device 500 includes one first buffer 510 (in order to the input as device 500) and a search module 520.Search module 520 is to be coupled in first buffer 510, and it has comprised a header detector 530, is used for receiving bit rate index and sampling rate index in the present signal frame in the digitally encoded signal; One read-only memory 550 is used for storing a look-up table, and this search module 520 can be found out the Search Area corresponding to this bit rate index and this sampling rate index in this look-up table; And a search device 570, be used for using the mode of back searching to search predetermined data type sample, to find out the synchronization character of next signal frame in this Search Area in this digitally encoded signal.In this Search Area, search plural tentation data type sample and cause erroneous judgement (this kind situation may occur in some and be used as in the digitally encoded signal of filler with ' 1 ') for fear of search device 570, search device 570 can be set for first tentation data type sample that coincide of in the process of back searching, finding as correct synchronization character.On the other hand, as previously mentioned, if the no-trump padding sequence is thought the doubt of synchronization character by mistake, system designer can also be designed so that it to use the mode of searching forward, to find out the synchronization character of next signal frame.
In the present embodiment, device 500 is arranged among the decoder 600, and decoder 600 also includes one second buffer 610, multiplexer 620 and decoding module 630 except comprising device 500.Second buffer 610 is mainly set in order to handle the MP3 signal with multiplexer 620, header detector 530 can be controlled multiplexer 620 according to the kind that detects this digitally encoded signal, for instance, when header detector 530 detects this digitally encoded signal is when encoding in the MP3 mode, and this digitally encoded signal can be via first buffer 510, second buffer 610, multiplexer 620 and delivered to decoding module 630.As for 630 main work of being responsible for signal analysis (parse), rebuilding (reconstruct) and oppose to reflect (inverse mapping) or the like of decoding module.When this digitally encoded signal was audio signal, its reconstruction signal of exporting promptly can be pulse-code modulation (pulse code modulation, audio signal PCM).
Certainly, using mpeg audio mainly is for the convenience on illustrating as example, in fact method proposed by the invention and relevant apparatus are not to use at the digitally encoded signal of mpeg audio, so long as any digitally encoded signal of being formed by the unfixed signal frame of a plurality of length, and all include a synchronization character in each signal frame, can use method proposed by the invention and relevant apparatus with tentation data type sample.
Compared to prior art, in method and relevant apparatus proposed by the invention, do not use the formula calculation mode, do not need to use the information of extension bit yet, and be to use the mode of tabling look-up, determine the position that the synchronization character of next signal frame may exist, re-use the mode of back searching, the comparison tentation data type sample that synchronization character had, to find out the synchronization character of next signal frame, the difference of position between the synchronization character of the synchronization character of next signal frame and present signal frame relatively again, and draw the length of present signal frame, and then the data of present signal frame are deciphered, have significantly different with prior art.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to the covering scope of patent of the present invention.

Claims (17)

1. a method that is used for seeking a synchronous character in next signal frame in a digitally encoded signal includes a plurality of signal frames in this digitally encoded signal, all includes this synchronization character in each signal frame, and this method includes following steps:
(a) use a look-up table, determine a Search Area; And
(b) in this Search Area in this digitally encoded signal, find out this synchronization character of this next signal frame.
The method of claim 1, wherein this method in the preceding following steps that include in addition of step (a):
(c) receive a bit rate index and the sampling rate index in the present signal frame in this digitally encoded signal;
Wherein, in step (a), this method is to use this look-up table, decides this Search Area according to this bit rate index and this sampling rate index.
3. method as claimed in claim 2 wherein, has stored a plurality of specific Search Areas in this look-up table, each specific Search Area is a kind of combination corresponding to this bit rate index and this sampling rate index.
4. method as claimed in claim 3, wherein, each stored Search Area all includes an initial position and an end position in this look-up table.
5. the method for claim 1, wherein in step (b), this method is back to search a predetermined data type sample in this Search Area, to find out this synchronization character of this next signal frame.
6. the method for claim 1, wherein in step (b), this method is to search a predetermined data type sample in this Search Area forward, to find out this synchronization character of this next signal frame.
7. the method for claim 1, wherein in step (b), this method is back to search a predetermined data type sample that occurs for the first time in this Search Area, to find out this synchronization character of this next signal frame.
8. the method for claim 1, wherein this digitally encoded signal is according to the coded digitally encoded signal that draws of the audio frequency specification of MPEG.
9. a device that is used for seeking the synchronous character in next signal frame in a digitally encoded signal includes a plurality of signal frames in this digitally encoded signal, all includes this synchronization character in each signal frame, and this device includes:
One buffer is used for receiving this digitally encoded signal;
One search module, be coupled in this buffer, be used for determining the Search Area that desire is searched this synchronization character of this next signal frame according to a look-up table, and in this Search Area in this digitally encoded signal, find out this synchronization character of this next signal frame.
10. device as claimed in claim 9, wherein, this search module receives a bit rate index and the sampling rate index in the present signal frame in this digitally encoded signal, and uses this look-up table, decides this Search Area according to this bit rate index and this sampling rate index.
11. device as claimed in claim 10, wherein, this search module includes a memory cell, is used for storing this look-up table.
12. device as claimed in claim 11, wherein, this memory cell is a read-only memory.
13. device as claimed in claim 11, wherein, this search module includes in addition:
One header detector is coupled in this buffer, is used for receiving this bit rate index and this sampling rate index in this present signal frame; And
One search device is coupled in this buffer and this memory cell, is used in this Search Area in this digitally encoded signal, finds out this synchronization character of this next signal frame.
14. device as claimed in claim 9 wherein, is back searched a predetermined data type sample, to find out this synchronization character of this next signal frame in this search module this Search Area in this digitally encoded signal.
15. device as claimed in claim 9 wherein, is searched a predetermined data type sample forward, to find out this synchronization character of this next signal frame in this search module this Search Area in this digitally encoded signal.
16. device as claimed in claim 9 wherein, is back searched a data type sample of being scheduled to that occurs for the first time, to find out this synchronization character of this next signal frame in this search module this Search Area in this digitally encoded signal.
17. device as claimed in claim 9, wherein, this digitally encoded signal is according to the coded digitally encoded signal that draws of the audio frequency specification of MPEG.
CNB2003101179504A 2003-11-26 2003-11-26 Method and apparatus for searching next signal frame synchronous character in digital coding signal Expired - Fee Related CN100466729C (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09312639A (en) * 1996-05-22 1997-12-02 Matsushita Electric Ind Co Ltd Synchronizing device
CN1312650A (en) * 2000-01-10 2001-09-12 Lg电子株式会社 Method and system for synchronizing video index between audio-frequency/video-frequency signals and datas
WO2002097603A1 (en) * 2001-06-01 2002-12-05 Thomson Licensing S.A. Method for analysing a digital audio flow and device for receiving said flow
JP2003249027A (en) * 2002-02-27 2003-09-05 Matsushita Electric Ind Co Ltd Recording/reproducing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09312639A (en) * 1996-05-22 1997-12-02 Matsushita Electric Ind Co Ltd Synchronizing device
CN1312650A (en) * 2000-01-10 2001-09-12 Lg电子株式会社 Method and system for synchronizing video index between audio-frequency/video-frequency signals and datas
WO2002097603A1 (en) * 2001-06-01 2002-12-05 Thomson Licensing S.A. Method for analysing a digital audio flow and device for receiving said flow
JP2003249027A (en) * 2002-02-27 2003-09-05 Matsushita Electric Ind Co Ltd Recording/reproducing device

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