JPS5570145A - Adaptive dpcm system - Google Patents
Adaptive dpcm systemInfo
- Publication number
- JPS5570145A JPS5570145A JP14397778A JP14397778A JPS5570145A JP S5570145 A JPS5570145 A JP S5570145A JP 14397778 A JP14397778 A JP 14397778A JP 14397778 A JP14397778 A JP 14397778A JP S5570145 A JPS5570145 A JP S5570145A
- Authority
- JP
- Japan
- Prior art keywords
- adaptive
- quantizer
- effect
- predicting unit
- transmission code
- 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.)
- Pending
Links
- 230000003044 adaptive effect Effects 0.000 title abstract 8
- 230000005540 biological transmission Effects 0.000 abstract 4
- 230000000694 effects Effects 0.000 abstract 3
- 238000011084 recovery Methods 0.000 abstract 3
- 238000013139 quantization Methods 0.000 abstract 2
- 238000005070 sampling Methods 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/06—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation
- H04B14/066—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using differential modulation with several bits [NDPCM]
- H04B14/068—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using differential modulation with several bits [NDPCM] with adaptive feedback
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Abstract
PURPOSE:To secure a quick recovery for the effect of the error of the transmission code through a simple device constitution by securing the recovery from the effect of the transmission code error with every frame time and via the backward-type adaptive predicting unit to perform the adaptive primary prediction. CONSTITUTION:Input signal Xj sent from terminal 105 is applied to subtractor 110, and the subtraction is given to the output of adaptive predicting unit 150 to deliver residual ej. Then residual ej is quantized at adaptive quantizer 120 to the prescribed sampling time to deliver quantization level lj. The level lj is applied to adaptive reverse quantizer 130 featuring the reverse characteristics to encoder 180 and quantizer 120, and output code qj of encoder 180 is transmitted to the reception side via multiplexer 190. Here backward-type quantization step size correction circuit 170 is provided at the transmission side, and the prediction coefficient value of one unit is set to the prescribed value. And the frame synchronous signal is combined with the quantized value. Then adaptive predicting unit 270, adaptive reverse quantizer 240, etc. are installed at the reception side, thus ensuring a quick recovery from the effect of the transmission code error.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14397778A JPS5570145A (en) | 1978-11-21 | 1978-11-21 | Adaptive dpcm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14397778A JPS5570145A (en) | 1978-11-21 | 1978-11-21 | Adaptive dpcm system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5570145A true JPS5570145A (en) | 1980-05-27 |
Family
ID=15351439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14397778A Pending JPS5570145A (en) | 1978-11-21 | 1978-11-21 | Adaptive dpcm system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5570145A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1985005747A1 (en) * | 1984-05-28 | 1985-12-19 | Sony Corporation | Digital signal transmission device |
-
1978
- 1978-11-21 JP JP14397778A patent/JPS5570145A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1985005747A1 (en) * | 1984-05-28 | 1985-12-19 | Sony Corporation | Digital signal transmission device |
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