JPS5639578B2 - - Google Patents
Info
- Publication number
- JPS5639578B2 JPS5639578B2 JP4326873A JP4326873A JPS5639578B2 JP S5639578 B2 JPS5639578 B2 JP S5639578B2 JP 4326873 A JP4326873 A JP 4326873A JP 4326873 A JP4326873 A JP 4326873A JP S5639578 B2 JPS5639578 B2 JP S5639578B2
- Authority
- JP
- Japan
- 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
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
- H03M7/3002—Conversion to or from differential modulation
- H03M7/3044—Conversion to or from differential modulation with several bits only, i.e. the difference between successive samples being coded by more than one bit, e.g. differential pulse code modulation [DPCM]
- H03M7/3046—Conversion to or from differential modulation with several bits only, i.e. the difference between successive samples being coded by more than one bit, e.g. differential pulse code modulation [DPCM] adaptive, 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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US24555972A | 1972-04-19 | 1972-04-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS4921056A JPS4921056A (en:Method) | 1974-02-25 |
| JPS5639578B2 true JPS5639578B2 (en:Method) | 1981-09-14 |
Family
ID=22927152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4326873A Expired JPS5639578B2 (en:Method) | 1972-04-19 | 1973-04-18 |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3772682A (en:Method) |
| JP (1) | JPS5639578B2 (en:Method) |
| BE (1) | BE798328A (en:Method) |
| CA (1) | CA969279A (en:Method) |
| DE (1) | DE2319650C3 (en:Method) |
| FR (1) | FR2180964B1 (en:Method) |
| GB (1) | GB1388232A (en:Method) |
| IT (1) | IT991561B (en:Method) |
| NL (1) | NL183115C (en:Method) |
| SE (2) | SE451522B (en:Method) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7400764A (nl) * | 1974-01-21 | 1975-07-23 | Philips Nv | Digitale inrichting voor het omzetten van ge- comprimeerde delta gemoduleerde signalen in pcm-signalen. |
| US4206447A (en) * | 1979-04-09 | 1980-06-03 | Bell Telephone Laboratories, Incorporated | Adaptive quantizer apparatus for differential coding of nonuniform digital signals |
| JPS56146313A (en) * | 1980-04-15 | 1981-11-13 | Victor Co Of Japan Ltd | Compressing and expanding system of digital modulated wave |
| US4524447A (en) * | 1983-05-25 | 1985-06-18 | Rca Corporation | Digital signal processing apparatus having digital dither |
| DE69026143T2 (de) * | 1989-06-07 | 1996-08-22 | Canon Kk | Kodefehler korrigierende Vorhersage-Decodiervorrichtung |
| JP2754741B2 (ja) * | 1989-06-09 | 1998-05-20 | キヤノン株式会社 | 符号化装置 |
| EP0508597B1 (en) * | 1991-03-08 | 1997-11-12 | Nec Corporation | ADPCM transcoder wherein different bit numbers are used in code conversion |
| EP1071218B1 (en) | 1999-07-19 | 2009-09-09 | Texas Instruments Inc. | Differential unary coding for digital audio signals |
| US7453889B2 (en) * | 2005-02-02 | 2008-11-18 | Texas Instruments Incorporated | Interoperability of ADPCM encoded voice communications |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3339142A (en) * | 1963-07-01 | 1967-08-29 | Martin Marietta Corp | Adaptive pulse transmission system with modified delta modulation and redundant pulse elimination |
| FR1489885A (fr) * | 1966-06-17 | 1967-07-28 | Alcatel Sa | Procédé de réduction de la bande passante dans un système de transmission par modulation en delta |
| US3500441A (en) * | 1967-10-12 | 1970-03-10 | Bell Telephone Labor Inc | Delta modulation with discrete companding |
| US3526855A (en) * | 1968-03-18 | 1970-09-01 | Bell Telephone Labor Inc | Pulse code modulation and differential pulse code modulation encoders |
| US3594560A (en) * | 1969-01-03 | 1971-07-20 | Bell Telephone Labor Inc | Digital expandor circuit |
| US3707712A (en) * | 1970-06-10 | 1972-12-26 | Univ Sherbrooke | Converter from delta modulation to pulse code modulation |
-
1972
- 1972-04-19 US US00245559A patent/US3772682A/en not_active Expired - Lifetime
- 1972-10-30 CA CA155,151A patent/CA969279A/en not_active Expired
-
1973
- 1973-04-05 SE SE7304816A patent/SE451522B/xx unknown
- 1973-04-16 IT IT68099/73A patent/IT991561B/it active
- 1973-04-17 NL NLAANVRAGE7305371,A patent/NL183115C/xx not_active IP Right Cessation
- 1973-04-17 BE BE130106A patent/BE798328A/xx not_active IP Right Cessation
- 1973-04-18 DE DE2319650A patent/DE2319650C3/de not_active Expired
- 1973-04-18 GB GB1865173A patent/GB1388232A/en not_active Expired
- 1973-04-18 FR FR7314176A patent/FR2180964B1/fr not_active Expired
- 1973-04-18 JP JP4326873A patent/JPS5639578B2/ja not_active Expired
-
1975
- 1975-11-06 SE SE7512465A patent/SE409633B/xx not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| SE451522B (sv) | 1987-10-12 |
| JPS4921056A (en:Method) | 1974-02-25 |
| FR2180964A1 (en:Method) | 1973-11-30 |
| SE7512465L (sv) | 1975-11-06 |
| CA969279A (en) | 1975-06-10 |
| DE2319650C3 (de) | 1981-07-09 |
| BE798328A (fr) | 1973-08-16 |
| DE2319650B2 (de) | 1980-09-18 |
| IT991561B (it) | 1975-08-30 |
| AU5450573A (en) | 1974-10-17 |
| NL183115C (nl) | 1988-07-18 |
| NL7305371A (en:Method) | 1973-10-23 |
| GB1388232A (en) | 1975-03-26 |
| FR2180964B1 (en:Method) | 1976-05-07 |
| NL183115B (nl) | 1988-02-16 |
| US3772682A (en) | 1973-11-13 |
| DE2319650A1 (de) | 1973-10-25 |
| SE409633B (sv) | 1979-08-27 |