JPH01158825A - Adaptive type coding control system - Google Patents
Adaptive type coding control systemInfo
- Publication number
- JPH01158825A JPH01158825A JP31632087A JP31632087A JPH01158825A JP H01158825 A JPH01158825 A JP H01158825A JP 31632087 A JP31632087 A JP 31632087A JP 31632087 A JP31632087 A JP 31632087A JP H01158825 A JPH01158825 A JP H01158825A
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- signal
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- total code
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- 230000003044 adaptive effect Effects 0.000 title claims description 7
- 238000000034 method Methods 0.000 claims description 32
- 230000005540 biological transmission Effects 0.000 description 10
- 230000015654 memory Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000005236 sound signal Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 101001129784 Autographa californica nuclear polyhedrosis virus Per os infectivity factor 0 Proteins 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- H03M7/46—Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind
- H03M7/48—Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind alternating with other codes during the code conversion process, e.g. run-length coding being performed only as long as sufficientlylong runs of digits of the same kind are present
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
情報に対応した最適な符号化方式を選択して符号化を行
う適応型符号化制御方式に関し、複数種類の符号化方式
から最適の符号化方式を選択して、効率の良い符号化を
行うことを目的とし、
情報発生源から発生される情報を同時に符号化する複数
種類の符号器と、該複数種類の符号器により符号化され
た前記情報のブロック毎の符号化信号の総符号長を比較
する比較部と、該比較部に於ける比較結果により、最も
短い総符号長の符号化信号を選択出力させるセレクタと
を備え、該セレクタにより選択出力された符号化信号と
符号化の種類とを含めて伝送又は蓄積するように構成す
る。[Detailed Description of the Invention] [Summary] Regarding an adaptive encoding control method that selects an optimal encoding method corresponding to information and performs encoding, the optimal encoding method is selected from multiple types of encoding methods. For the purpose of efficient encoding, we have developed a system that includes multiple types of encoders that simultaneously encode information generated from an information source, and that encodes each block of the information encoded by the multiple types of encoders. and a selector that selects and outputs the coded signal with the shortest total code length based on the comparison result in the comparison unit, and the selector selects and outputs the coded signal with the shortest total code length, The encoded signal and the type of encoding are configured to be transmitted or stored together.
本発明は、情報に対応した最適な符号化方式を選択して
符号化を行う適応型符号化制御方式に関するものである
。The present invention relates to an adaptive encoding control method that performs encoding by selecting an optimal encoding method corresponding to information.
音声信号９画像信号或いは各種のデータを伝送する場合
、伝送効率を向上させる為に、各種の圧縮符号化方式が
適用され、平均的に短い符号長となるように符号化され
ている。When transmitting audio signals, image signals, or various types of data, various compression encoding methods are applied to improve transmission efficiency, and the encoding is performed so that the code length is short on average.
第４図は伝送システムの説明図であり、送信側の情報発
生源３１から音声信号やファクシミリ信号等のに種の情
報α＝ （ｉ＝ｔ、２． ・・・Ｋ）が発生され、
符号器３２により符号化された符号化信号Ｃ８は伝送路
３３に送出される。受信側では、復号器３４により符号
化信号Ｃｉを復号して情報α、を再生する。FIG. 4 is an explanatory diagram of the transmission system, in which information α= (i=t, 2. . . . K) such as a voice signal or a facsimile signal is generated from an information generation source 31 on the transmitting side.
The encoded signal C8 encoded by the encoder 32 is sent to the transmission path 33. On the receiving side, the decoder 34 decodes the encoded signal Ci to reproduce information α.
この場合の符号化方式は、伝送効率を向上する為に、適
応差分符号化方式、可変長符号化方式等が採用されてい
る。適応差分符号化方式は、音声信号や画像信号等に於
いて、適応的に量子化ステップを切替えて差分を符号化
するものであり、又可変長符号化方式は、情報発生源３
１からの情報α１の発生確率をＰ、とすると、発生確率
Ｐｉが最も高い情報α、に対して最も短い符号を割当て
、発生確率Ｐ、が低くなるに従って長い符号を割当てる
ことにより、平均の符号長を短くする符号化方式であり
、ハフマン（ｌ（ｇ４ｆｍａｎ）符号として知られてい
る。又ファクシミリ信号を伝送する場合の可変長符号化
方式として、ランレングス符号化方式、モデファイト・
ハフマン（ＭＨ）符号化方式、モデファイト・リード（
ＭＲ）符号化方式等が知られている。In this case, an adaptive differential encoding method, a variable length encoding method, or the like is adopted as the encoding method in order to improve transmission efficiency. The adaptive differential encoding method adaptively switches the quantization step to encode the difference in audio signals, image signals, etc., and the variable length encoding method encodes the difference between the information generation source 3 and the like.
If the probability of occurrence of information α1 from 1 is P, then the shortest code is assigned to the information α with the highest probability of occurrence Pi, and the longer the code is assigned as the probability of occurrence P becomes lower, the average code is This is a coding method that shortens the length, and is known as the Huffman (l (g4fman) code.Also, as a variable length coding method for transmitting facsimile signals, there are run-length coding methods, modifier codes, etc.
Huffman (MH) encoding method, Modified Read (
MR) encoding methods are known.
前述の従来の可変長符号化方式は、情報発生源３１から
の情報αｉの発生確率Ｐ１が時間的に変動しないことを
前提として、平均符号長が最も短くなる符号化方式を予
め設定している。従って、情報発生源３１からの情報α
１の発生確率Ｐ８が時間的に変動する場合は、平均符号
長が短くなるとは限らないことになり、伝送効率を向上
することができない欠点が生じる。又情報α、を符号化
して蓄積する場合に、記憶容量を充分に低減することが
できないことになる。In the conventional variable length encoding method described above, the encoding method that provides the shortest average code length is preset on the premise that the probability of occurrence P1 of the information αi from the information generation source 31 does not vary over time. . Therefore, the information α from the information source 31
If the occurrence probability P8 of 1 varies over time, the average code length will not necessarily be shortened, resulting in the disadvantage that transmission efficiency cannot be improved. Furthermore, when the information α is encoded and stored, the storage capacity cannot be sufficiently reduced.
本発明は、複数種類の符号化方式から最適の符号化方式
を選択して、効率の良い符号化を行うことを目的とする
ものである。An object of the present invention is to perform efficient encoding by selecting an optimal encoding method from a plurality of types of encoding methods.
本発明の適応型符号化制御方式は、最適や符号化方式を
自動的に選択させて情報の符号化を行わせるものであり
、第１図を参照して説明する。The adaptive encoding control method of the present invention automatically selects the optimum encoding method to encode information, and will be explained with reference to FIG.
情報発生源１から発生される情報を同時に符号化する複
数種類の符号器２−１〜２−ｎと、これら複数種類の符
号器２−１〜２−ｎにより符号化された前記情報のブロ
ック毎の符号化信号の総符号長を比較する比較部３と、
この比較部３に於ける比較結果により最も短い総符号長
の符号化信号を選択出力させるセレクタ４とを備え、こ
のセレクタ４により選択出力された符号化信号と符号化
種類とを含めて伝送叉は蓄積するものである。Multiple types of encoders 2-1 to 2-n that simultaneously encode information generated from the information generation source 1, and blocks of the information encoded by these multiple types of encoders 2-1 to 2-n. a comparison unit 3 that compares the total code length of each encoded signal;
It is equipped with a selector 4 that selectively outputs the coded signal with the shortest total code length based on the comparison result in the comparison unit 3, and the coded signal selected and output by the selector 4, including the coded type, is transmitted. is something that accumulates.
複数種類の符号器２−１〜２−ｎにより情報の符号化を
行い、その情報のブロック毎の符号化信号の総符号長を
求めて、比較部３により比較し、最小総符号長となる符
号化信号を、その情報のブロックに対する最適符号化方
式によるものとし、セレクタ４から選択出力させるもの
である。従って、情報の発生確率が時間的に変動する場
合でも、ブロック毎に最適な符号化方式に切替えて符号
化を行うことになり、効率の良い符号化を行うことがで
きる。Information is encoded by multiple types of encoders 2-1 to 2-n, the total code length of the encoded signal for each block of information is determined, and the total code length is compared by the comparison unit 3 to obtain the minimum total code length. The encoded signal is based on the optimum encoding method for the block of information, and is selectively outputted from the selector 4. Therefore, even if the probability of occurrence of information varies over time, the encoding is performed by switching to the optimal encoding method for each block, and efficient encoding can be performed.
以下図面を参照して本発明の実施例について詳細に説明
する。Embodiments of the present invention will be described in detail below with reference to the drawings.
第２図は本発明の実施例のブロック図であり、１１は情
報発生源、１２−１〜１２−４はそれぞれ異なる種類の
符号化を行う符号器、１３は比較器、１４はセレクタ、
１５−１〜１５−４は符号長積算器、１６−１〜１６−
４はバッファメモリ、１７は送信部であって、４種類の
符号器１２−１〜１２−４を設けた場合を示し、例えば
、それぞれ情報発生源１１からの情報α、の異なる発生
確率Ｐ、〜Ｐ４に対応して符号割当てが行われている符
号器或いはそれぞれ異なる圧縮符号化方式の符号器とす
ることができる。FIG. 2 is a block diagram of an embodiment of the present invention, in which 11 is an information generation source, 12-1 to 12-4 are encoders that perform different types of encoding, 13 is a comparator, 14 is a selector,
15-1 to 15-4 are code length integrator, 16-1 to 16-
4 is a buffer memory, 17 is a transmitting unit, and shows a case where four types of encoders 12-1 to 12-4 are provided. It is possible to use an encoder to which code assignment is performed corresponding to P4, or an encoder using different compression encoding methods.
情報発生源１１からの音声信号２画像信号、各種データ
等の情報α、は、符号器１２−１〜１２−４により同時
に符号化され、符号器１２−１〜１２−４対応の異なる
符号化信号Ｃ，−Ｃ４となる。各符号化信号ｃ、−Ｃ４
は、それぞれ符号長積算器１５−１〜１５−４に加えら
れて符号長が積算され、又バッファメモリ１６−１〜１
６−４に加えられて一時スドアされる。Information α, such as audio signals, 2 image signals, and various data, from the information source 11 are simultaneously encoded by the encoders 12-1 to 12-4, and different encodings corresponding to the encoders 12-1 to 12-4 are performed. The signals become C and -C4. Each encoded signal c, -C4
are respectively added to the code length integrator 15-1 to 15-4 to accumulate the code length, and are added to the buffer memories 16-1 to 16-1.
He was added to the score at 6-4 and was temporarily suspended.
符号長積算器１５−１〜１５−４は、所定長或いは１０
ｍ５等の所定時間の情報α１をブロックとし、そのブロ
ック毎の符号化信号Ｃ，−ｃ４の符号長を積算し、積算
出力信号り、＃Ｌ４を比較器１３に加えるもので、ブロ
ック毎にリセットされて符号化信号をカウントアンプす
るカウンタ等により構成することができる。The code length integrator 15-1 to 15-4 has a predetermined length or 10
The information α1 for a predetermined time such as m5 is set as a block, the code lengths of the encoded signals C and -c4 for each block are integrated, and the integrated output signal #L4 is added to the comparator 13. It is reset for each block. It can be configured by a counter or the like that counts and amplifies the encoded signal.
又比較器１３は、積算出力信号Ｌ１〜Ｌ４を比較して、
最小の積算出力信号を示す選択信号ｍを出力し、セレク
タ１４と送信部１７とに加えるもので、この選択信号ｍ
は、ブロック毎の最小総符号長となる符号化方式を指示
することになる。Further, the comparator 13 compares the integrated output signals L1 to L4,
A selection signal m indicating the minimum integrated output signal is output and added to the selector 14 and the transmitter 17.
specifies the encoding method that provides the minimum total code length for each block.
バッファメモリ１６−１〜１６−４は、１ブロック分の
符号化信号Ｃ，〜Ｃ４を一時スドアできる容量に設定さ
れており、ストアされた符号化信号はブロックの終りに
読出される。即ち、ＰＩＦ０（ファーストイン・ファー
ストアウト）構成のメモリとすることができる。構成る
ブロックに於ける符号化信号の総符号長が長くなった為
に、バッファメモリがオーバフローした場合、他のバッ
ファメモリがオーバフローしなければ、オーバフローし
ないバッファメモリにストアされた符号化信号を選択出
力できるから、オーバフローに対する特別な処理は必要
でなく、従って、バッファメモリ１６−１〜１６−４の
容量は余り大きくする必要がないことになる。The buffer memories 16-1 to 16-4 are set to have a capacity that can temporarily store one block of encoded signals C, to C4, and the stored encoded signals are read out at the end of the block. That is, it can be a memory with a PIF0 (first-in, first-out) configuration. If the buffer memory overflows because the total code length of the encoded signals in the constituent blocks becomes longer, select the encoded signal stored in the buffer memory that will not overflow unless other buffer memories overflow. Since the data can be output, no special processing is required for overflow, and therefore, the capacity of the buffer memories 16-1 to 16-4 does not need to be increased very much.
又セレクタ１４は、選択信号ｍに従ってバッファメモリ
１６−１〜１６−４を選択し、−時ストアされた符号化
信号を送信部１７に加える。送信部１７は、選択出力さ
れた符号化信号に選択信号ｍを付加して伝送路に送出す
る。即ち、ブロック毎の最小総符号長となる符号化信号
が選択され、その選択信号ｍが付加されて伝送路に送出
されることになる。Further, the selector 14 selects the buffer memories 16-1 to 16-4 according to the selection signal m, and applies the stored encoded signal to the transmitter 17 at - time. The transmitter 17 adds a selection signal m to the selectively output encoded signal and sends it to the transmission path. That is, the encoded signal having the minimum total code length for each block is selected, the selection signal m is added thereto, and the signal is sent to the transmission path.
比較器１３からの選択信号ｍは、４種類の符号器１２−
１〜１２−４の何れか一つを指示するものであるから、
２ビツトで良いことになる。そして、セレクタ１４によ
り選択出力された符号化信号は、総符号長が最小となる
ものであるから、選択信号ｍを付加しても、他の符号化
信号に比較して短い総符号長とすることが可能となる。The selection signal m from the comparator 13 is sent to four types of encoders 12-
Since it indicates any one of 1 to 12-4,
2 bits would be fine. The encoded signal selected and output by the selector 14 has the minimum total code length, so even if the selection signal m is added, the total code length is shorter than other encoded signals. becomes possible.
従って、伝送効率を向上することができる。又セレクタ
１４により選択出力された符号化信号を記憶装置に記憶
させる場合も、選択信号ｍを付加して記憶させることに
なるが、最小の総符号長の符号化信号を選択するもので
あるから、同一の記憶容量に対して記憶情報量を多くす
ることが可能となる。Therefore, transmission efficiency can be improved. Also, when the encoded signal selectively output by the selector 14 is stored in the storage device, the selection signal m is added and stored, but the encoded signal with the minimum total code length is selected. , it becomes possible to increase the amount of stored information for the same storage capacity.
第３図は本発明の実施例の受信側の要部ブロック図であ
り、２１は受信部、２２は分配器、２３−１〜２３−４
は符号器１２−１〜１２−４に対応した復号器である。FIG. 3 is a block diagram of the main parts of the receiving side of the embodiment of the present invention, in which 21 is a receiving section, 22 is a distributor, and 23-1 to 23-4.
is a decoder corresponding to encoders 12-1 to 12-4.
受信部２１で受信した信号から選択信号ｍを抽出し、こ
の選択信号ｍを分配器２２に加えて、受信符号化信号を
選択された復号器に加えて復号させる。A selection signal m is extracted from the signal received by the receiving section 21, and this selection signal m is applied to the distributor 22, and the received encoded signal is applied to the selected decoder and decoded.
又記憶装置に記憶された符号化信号を再生し、復号する
場合も、前述と同様に、符号化信号に付加された選択信
号ｍを分離し、この選択信号ｍによって符号化信号を復
号する復号器を選択することになる。Also, when reproducing and decoding an encoded signal stored in a storage device, decoding is performed in which the selection signal m added to the encoded signal is separated and the encoded signal is decoded using this selection signal m, in the same manner as described above. You will have to choose a vessel.
例えば、第２図に示す情報発生源１１からの情報α、の
成るブロックについて、符号化信号ＣＩ〜Ｃ４の総符号
長を、それぞれ符号長積算器１５−１〜１５−４で積算
し、それぞれの積算出力信号り、−Ｌ４を比較器１３で
比較し、符号化信号Ｃ２の総符号長が最小の場合、選択
信号ｍは符号器１２−２を指示するものとなり、バッフ
ァメモリ１６−２に一時スドアされた符号化信号Ｃ２が
選択出力され、この符号化信号Ｃ２に選択信号ｍが付加
されて送出される。For example, for a block consisting of information α from the information source 11 shown in FIG. When the total code length of the encoded signal C2 is the minimum, the selection signal m instructs the encoder 12-2 and is stored in the buffer memory 16-2. The temporarily stored coded signal C2 is selectively output, and the selection signal m is added to this coded signal C2 and sent out.
従って、第３図に示す受信側に於いては、受信信号から
分離された選択信号ｍにより分配器２２が制御されて、
受信符号化信号Ｃ２は復号器２３−２に加えられ、符号
器１２−２に対応した復号化により情報α、が再生され
る。Therefore, on the receiving side shown in FIG. 3, the distributor 22 is controlled by the selection signal m separated from the received signal.
The received encoded signal C2 is applied to the decoder 23-2, and information α is reproduced by decoding corresponding to the encoder 12-2.
又受信部２１で選択信号ｍを抽出した後、符号化信号を
同時に復号器２３−１〜２３−４に加えて同時に復号化
を行い、復号された情報を選択信号ｍで制御されるセレ
クタによって選択出力するように構成することも可能で
ある。この場合、選択信号ｍによって指示される復号器
以外の復号器で復号された情報は、送信側の情報とは異
なることになる。After extracting the selection signal m in the receiving section 21, the encoded signal is simultaneously applied to the decoders 23-1 to 23-4 and decoded at the same time, and the decoded information is sent to the selector controlled by the selection signal m. It is also possible to configure it to selectively output. In this case, the information decoded by a decoder other than the decoder designated by the selection signal m will be different from the information on the transmitting side.
前述の実施例は、４種類の符号化方式を選択する場合を
示すものであるが、２種類の符号化方式を選択する場合
にも適用可能であり、又更に多数種類の符号化方式を選
択するように構成することも可能である。Although the above-mentioned embodiment shows the case where four types of encoding methods are selected, it is also applicable to the case where two types of encoding methods are selected, or even more types of encoding methods are selected. It is also possible to configure it to do so.
以上説明したように、本発明は、情報発生源１からの情
報α（を複数種類の符号器２−１〜２−ｎにより符号化
して、情報のブロック毎の符号化信号の総符号長を比較
部３により比較し、最小総符号長となる符号化信号を選
択出力させるものであり、情報の発生確率が時間的に変
動する場合でも、ブロック毎に適応的に最適符号化方式
を選択して、最小の符号長となる符号化信号を伝送或い
は蓄積することができるから、伝送効率を向上し、或い
は蓄積容量を削減することができる。As explained above, the present invention encodes the information α (from the information source 1) using multiple types of encoders 2-1 to 2-n, and calculates the total code length of the encoded signal for each block of information. The comparator 3 compares and selects and outputs the encoded signal with the minimum total code length, and even when the probability of information occurrence varies over time, the optimal encoding method is adaptively selected for each block. Since the encoded signal having the minimum code length can be transmitted or stored, transmission efficiency can be improved or storage capacity can be reduced.
第１図は本発明の原理説明図、第２図は本発明の実施例
のブロック図、第３図は本発明の実施例の受信側の要部
ブロック図、第４図は伝送システムの説明図である。
１は情報発生源、２−１〜２−ｎは符号器、３は比較部
、４はセレクタである。Fig. 1 is a diagram explaining the principle of the present invention, Fig. 2 is a block diagram of an embodiment of the invention, Fig. 3 is a block diagram of the main part of the receiving side of the embodiment of the invention, and Fig. 4 is an explanation of the transmission system. It is a diagram. 1 is an information generation source, 2-1 to 2-n are encoders, 3 is a comparator, and 4 is a selector.
Claims (1)
る複数種類の符号器（２−１〜２−ｎ）と、 該複数種類の符号器（２−１〜２−ｎ）により符号化さ
れた前記情報のブロック毎の符号化信号の総符号長を比
較する比較部（３）と、 該比較部（３）に於ける比較結果により、最も短い総符
号長の符号化信号を選択出力させるセレクタ（４）とを
備え、 該セレクタ（４）により選択出力された符号化信号と符
号化の種類とを含めて伝送又は蓄積することを特徴とす
る適応型符号化制御方式。[Claims] A plurality of types of encoders (2-1 to 2-n) that simultaneously encode information generated from an information generation source (1); -n), which compares the total code length of the coded signal for each block of the information encoded by Adaptive encoding, comprising a selector (4) that selectively outputs the encoded signal, and transmits or stores the encoded signal selectively output by the selector (4) and the type of encoding. control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31632087A JPH01158825A (en) | 1987-12-16 | 1987-12-16 | Adaptive type coding control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31632087A JPH01158825A (en) | 1987-12-16 | 1987-12-16 | Adaptive type coding control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01158825A true JPH01158825A (en) | 1989-06-21 |
Family
ID=18075819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31632087A Pending JPH01158825A (en) | 1987-12-16 | 1987-12-16 | Adaptive type coding control system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01158825A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0448802A2 (en) * | 1990-03-30 | 1991-10-02 | International Business Machines Corporation | Dynamic model selection during data compression |
| WO1999004572A1 (en) * | 1997-07-18 | 1999-01-28 | British Broadcasting Corporation | Re-encoding decoded signals |
| JP2012134858A (en) * | 2010-12-22 | 2012-07-12 | Mitsubishi Electric Corp | Data compression apparatus, data compression method and data compression program |
-
1987
- 1987-12-16 JP JP31632087A patent/JPH01158825A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0448802A2 (en) * | 1990-03-30 | 1991-10-02 | International Business Machines Corporation | Dynamic model selection during data compression |
| JPH04223717A (en) * | 1990-03-30 | 1992-08-13 | Internatl Business Mach Corp <Ibm> | Method for data compression, method for selection of system and dynamic model, and system |
| WO1999004572A1 (en) * | 1997-07-18 | 1999-01-28 | British Broadcasting Corporation | Re-encoding decoded signals |
| US6560283B1 (en) | 1997-07-18 | 2003-05-06 | British Broadcasting Corporation | Re-encoding decoded signals |
| JP2012134858A (en) * | 2010-12-22 | 2012-07-12 | Mitsubishi Electric Corp | Data compression apparatus, data compression method and data compression program |
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