JPS6251542B2 - - Google Patents
Info
- Publication number
- JPS6251542B2 JPS6251542B2 JP3366980A JP3366980A JPS6251542B2 JP S6251542 B2 JPS6251542 B2 JP S6251542B2 JP 3366980 A JP3366980 A JP 3366980A JP 3366980 A JP3366980 A JP 3366980A JP S6251542 B2 JPS6251542 B2 JP S6251542B2
- Authority
- JP
- Japan
- Prior art keywords
- adaptive
- value
- prediction
- quantization
- backward
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000003044 adaptive effect Effects 0.000 claims description 107
- 238000013139 quantization Methods 0.000 claims description 45
- 238000000034 method Methods 0.000 claims description 37
- 230000005540 biological transmission Effects 0.000 claims description 33
- 238000012937 correction Methods 0.000 claims description 29
- 125000002015 acyclic group Chemical group 0.000 claims description 5
- 238000012986 modification Methods 0.000 claims description 5
- 230000004048 modification Effects 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims 1
- 238000004891 communication Methods 0.000 description 7
- 230000006866 deterioration Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005236 sound signal Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 3
- 238000005311 autocorrelation function Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 108010076504 Protein Sorting Signals Proteins 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M3/00—Conversion of analogue values to or from differential modulation
- H03M3/04—Differential modulation with several bits, e.g. differential pulse code modulation [DPCM]
- H03M3/042—Differential modulation with several bits, e.g. differential pulse code modulation [DPCM] with adaptable step size, e.g. adaptive differential pulse code modulation [ADPCM]
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3366980A JPS56129444A (en) | 1980-03-17 | 1980-03-17 | Adaptive type differential pcm system and its device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3366980A JPS56129444A (en) | 1980-03-17 | 1980-03-17 | Adaptive type differential pcm system and its device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56129444A JPS56129444A (en) | 1981-10-09 |
| JPS6251542B2 true JPS6251542B2 (fr) | 1987-10-30 |
Family
ID=12392860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3366980A Granted JPS56129444A (en) | 1980-03-17 | 1980-03-17 | Adaptive type differential pcm system and its device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56129444A (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5972244A (ja) * | 1982-10-18 | 1984-04-24 | Nippon Telegr & Teleph Corp <Ntt> | 適応予測符号化方式 |
-
1980
- 1980-03-17 JP JP3366980A patent/JPS56129444A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56129444A (en) | 1981-10-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4426483B2 (ja) | オーディオ信号の符号化効率を向上させる方法 | |
| US8620651B2 (en) | Bit error concealment methods for speech coding | |
| JP3102015B2 (ja) | 音声復号化方法 | |
| KR101370192B1 (ko) | 오디오 코덱을 갖는 보청기 및 방법 | |
| JPH0519331B2 (fr) | ||
| Noll | A comparative study of various quantization schemes for speech encoding | |
| JPS60116000A (ja) | 音声符号化装置 | |
| US4918729A (en) | Voice signal encoding and decoding apparatus and method | |
| JP2001509615A (ja) | 組み合わせ式音声コーダとエコーキャンセラ | |
| US4554670A (en) | System and method for ADPCM transmission of speech or like signals | |
| JP2007504503A (ja) | 低ビットレートオーディオ符号化 | |
| US4470146A (en) | Adaptive quantizer with instantaneous error robustness | |
| Dubnowski et al. | Variable rate coding of speech | |
| JPH0411054B2 (fr) | ||
| EP3642839B1 (fr) | Codage et décodage de signal audio | |
| US5802109A (en) | Speech encoding communication system | |
| JPH09506187A (ja) | Ａｄｐｃｍ音声コーダのための適応誤差制御 | |
| US5812944A (en) | Mobile speech level reduction circuit responsive to base transmitted signal | |
| JPS6251541B2 (fr) | ||
| JPS6251542B2 (fr) | ||
| US5621760A (en) | Speech coding transmission system and coder and decoder therefor | |
| Simkus et al. | Error resilience enhancement for a robust adpcm audio coding scheme | |
| JP3107922B2 (ja) | リーク予測符号化方式 | |
| Cointot | A 32-kbit/sec ADPCM coder robust to channel errors | |
| Yatsuzuka et al. | An 32-kbps ADPCM encoding with a variable initially large leakage and adaptive dual loop predictors |