FR2406346A1 - Procede et dispositif de reduction de bruit dans un codeur delta a pas variable - Google Patents
Procede et dispositif de reduction de bruit dans un codeur delta a pas variableInfo
- Publication number
- FR2406346A1 FR2406346A1 FR7827025A FR7827025A FR2406346A1 FR 2406346 A1 FR2406346 A1 FR 2406346A1 FR 7827025 A FR7827025 A FR 7827025A FR 7827025 A FR7827025 A FR 7827025A FR 2406346 A1 FR2406346 A1 FR 2406346A1
- Authority
- FR
- France
- Prior art keywords
- noise reduction
- reduction process
- integrator
- output
- variable step
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M3/00—Conversion of analogue values to or from differential modulation
- H03M3/02—Delta modulation, i.e. one-bit differential modulation
- H03M3/022—Delta modulation, i.e. one-bit differential modulation with adaptable step size, e.g. adaptive delta modulation [ADM]
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)
- Analogue/Digital Conversion (AREA)
Abstract
Codeur delta incluant un dispositif 4 pour réduire la génération de bruit lorsque le signal entrée est faible Le signal d'entrée est comparé en 1 avec la sortie de l'intégrateur numérique 7. La sortie du comparateur 1 est échantillonnée par la bascule 3 qui fournit les bits de sortie. Un générateur 8 fournit des pas d'incrémentation à l'intégrateur 7 à travers le dispositif 4. Si le pas fourni par 8 est minimum et si deux bits de sortie successifs sont différents le dispositif 4 fournit à l'intégrateur 7 un pas modifié plus grand que le pas minimum. Application aux systèmes de codage delta.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/842,710 US4110705A (en) | 1977-10-17 | 1977-10-17 | Noise reduction method and apparatus for companded delta modulators |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2406346A1 true FR2406346A1 (fr) | 1979-05-11 |
FR2406346B1 FR2406346B1 (fr) | 1983-03-18 |
Family
ID=25288062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7827025A Granted FR2406346A1 (fr) | 1977-10-17 | 1978-09-15 | Procede et dispositif de reduction de bruit dans un codeur delta a pas variable |
Country Status (12)
Country | Link |
---|---|
US (1) | US4110705A (fr) |
JP (1) | JPS5919491B2 (fr) |
AT (1) | AT376336B (fr) |
AU (1) | AU517906B2 (fr) |
CA (1) | CA1121057A (fr) |
CH (1) | CH643973A5 (fr) |
DE (1) | DE2836049C2 (fr) |
ES (1) | ES474225A1 (fr) |
FR (1) | FR2406346A1 (fr) |
GB (1) | GB1576980A (fr) |
IT (1) | IT1159131B (fr) |
SU (1) | SU1082343A3 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2849001C2 (de) * | 1978-11-11 | 1982-10-07 | TE KA DE Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg | Netzwerk für adaptive Deltamodulation |
US4264974A (en) * | 1979-12-17 | 1981-04-28 | International Business Machines Corporation | Optimized digital delta modulation compander having truncation effect error recovery |
US4700362A (en) * | 1983-10-07 | 1987-10-13 | Dolby Laboratories Licensing Corporation | A-D encoder and D-A decoder system |
NO160750C (no) * | 1985-06-27 | 1989-05-24 | Norway Geophysical Co | Anordning for digital signalbehandling paa kontinuerlige bitstroemmer. |
US5592508A (en) * | 1994-09-22 | 1997-01-07 | Cooper; J. Carl | Analog signal coding and transmission apparatus and method capable of operation with multiple types of analog and digital signals |
US9503121B2 (en) * | 2014-10-17 | 2016-11-22 | Infineon Technologies Ag | Very high dynamic-range switched capacitor ADC with large input impedance for applications tolerating increased distortion and noise at large input signal levels |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3716803A (en) * | 1971-12-27 | 1973-02-13 | Bell Telephone Labor Inc | Stabilized delta modulator |
US3806806A (en) * | 1972-11-20 | 1974-04-23 | Bell Telephone Labor Inc | Adaptive data modulator |
JPS547525B2 (fr) * | 1973-12-28 | 1979-04-07 | ||
US4025852A (en) * | 1975-10-14 | 1977-05-24 | Bell Telephone Laboratories, Incorporated | Method and arrangement for controlling delta modulator idle-channel noise |
-
1977
- 1977-10-17 US US05/842,710 patent/US4110705A/en not_active Expired - Lifetime
-
1978
- 1978-05-12 GB GB19327/78A patent/GB1576980A/en not_active Expired
- 1978-07-07 CA CA000306954A patent/CA1121057A/fr not_active Expired
- 1978-08-17 DE DE2836049A patent/DE2836049C2/de not_active Expired
- 1978-08-21 AU AU39123/78A patent/AU517906B2/en not_active Expired
- 1978-08-22 AT AT0611778A patent/AT376336B/de not_active IP Right Cessation
- 1978-09-08 JP JP53109883A patent/JPS5919491B2/ja not_active Expired
- 1978-09-13 CH CH958778A patent/CH643973A5/de not_active IP Right Cessation
- 1978-09-15 FR FR7827025A patent/FR2406346A1/fr active Granted
- 1978-09-27 IT IT28126/78A patent/IT1159131B/it active
- 1978-10-16 SU SU782677104A patent/SU1082343A3/ru active
- 1978-10-16 ES ES474225A patent/ES474225A1/es not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB1576980A (en) | 1980-10-15 |
AU3912378A (en) | 1980-02-28 |
ES474225A1 (es) | 1979-04-01 |
AU517906B2 (en) | 1981-09-03 |
DE2836049C2 (de) | 1985-01-31 |
ATA611778A (de) | 1984-03-15 |
FR2406346B1 (fr) | 1983-03-18 |
IT1159131B (it) | 1987-02-25 |
CA1121057A (fr) | 1982-03-30 |
DE2836049A1 (de) | 1979-04-26 |
JPS5462765A (en) | 1979-05-21 |
US4110705A (en) | 1978-08-29 |
CH643973A5 (de) | 1984-06-29 |
JPS5919491B2 (ja) | 1984-05-07 |
IT7828126A0 (it) | 1978-09-27 |
AT376336B (de) | 1984-11-12 |
SU1082343A3 (ru) | 1984-03-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |