JPS54120571A - Dpcm-pcm converter - Google Patents
Dpcm-pcm converterInfo
- Publication number
- JPS54120571A JPS54120571A JP2793378A JP2793378A JPS54120571A JP S54120571 A JPS54120571 A JP S54120571A JP 2793378 A JP2793378 A JP 2793378A JP 2793378 A JP2793378 A JP 2793378A JP S54120571 A JPS54120571 A JP S54120571A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- quantizing
- pcm
- conversion
- 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.)
- Granted
Links
Landscapes
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Abstract
PURPOSE: To prevent conversion noises from being added even if conversion is repeated, by varying PCM quantizing characteristics inside of a converter circuit according to an input signal.
CONSTITUTION: A DPCM signal inputted from input terminal 10 is decoded by a DPCM decoding circuit and then outputted to digital adder ciruit 12, which adds the decoded signal and a forecast signal together and supplies its output to both PCM quantizing circuit 20 and delay circuit 14. In this circuit 14, the signal is delay- stored until the next sampling preiod and then applied to circuit 13, which outputs a next forecast value to circuit 12 at the next sampling period. At every prescribed period, PCM quantizing circuit 20 is supplied with signals from terminal 10 and circuit 12 and while the quantizing characteristics are varied according to those input signal, the output signal of circuit 12 is PCM-quantizing-coded and outputted from terminal 16. Consequently, conversion noises can be prevented from being added even if the conversion is repeated.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2793378A JPS6058614B2 (en) | 1978-03-11 | 1978-03-11 | DPCM-PCM converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2793378A JPS6058614B2 (en) | 1978-03-11 | 1978-03-11 | DPCM-PCM converter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54120571A true JPS54120571A (en) | 1979-09-19 |
JPS6058614B2 JPS6058614B2 (en) | 1985-12-20 |
Family
ID=12234686
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2793378A Expired JPS6058614B2 (en) | 1978-03-11 | 1978-03-11 | DPCM-PCM converter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6058614B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4475213A (en) * | 1982-12-27 | 1984-10-02 | At&T Bell Laboratories | Digital code converter |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63177564U (en) * | 1987-05-08 | 1988-11-17 |
-
1978
- 1978-03-11 JP JP2793378A patent/JPS6058614B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4475213A (en) * | 1982-12-27 | 1984-10-02 | At&T Bell Laboratories | Digital code converter |
Also Published As
Publication number | Publication date |
---|---|
JPS6058614B2 (en) | 1985-12-20 |
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