IT1021020B - Sistema e dispositivi di comunica zione con segnali codificati p.c.m. a ridondanza ridotta - Google Patents
Sistema e dispositivi di comunica zione con segnali codificati p.c.m. a ridondanza ridottaInfo
- Publication number
- IT1021020B IT1021020B IT23193/74A IT2319374A IT1021020B IT 1021020 B IT1021020 B IT 1021020B IT 23193/74 A IT23193/74 A IT 23193/74A IT 2319374 A IT2319374 A IT 2319374A IT 1021020 B IT1021020 B IT 1021020B
- Authority
- IT
- Italy
- Prior art keywords
- devices
- communication system
- coded signals
- reduced redundancy
- redundancy
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1682—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers
- H04J3/1688—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers the demands of the users being taken into account after redundancy removal, e.g. by predictive coding, by variable sampling
-
- 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
- H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
- H04B14/046—Systems or methods for reducing noise or bandwidth
- H04B14/048—Non linear compression or expansion
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT23193/74A IT1021020B (it) | 1974-05-27 | 1974-05-27 | Sistema e dispositivi di comunica zione con segnali codificati p.c.m. a ridondanza ridotta |
NL7505563A NL7505563A (nl) | 1974-05-27 | 1975-05-12 | Kommunikatiestelsel en -inrichting met p.c.m.-gecodeerde signalen. |
ES437780A ES437780A1 (es) | 1974-05-27 | 1975-05-19 | Perfeccionamientos en sistemas de comunicacion, con su dis- positivo correspondiente, para reducir la redundancia de se-nales codificadas p. c. m. |
GB21437/75A GB1509233A (en) | 1974-05-27 | 1975-05-20 | Pcm telephone communication system |
AR258946A AR208911A1 (es) | 1974-05-27 | 1975-05-26 | Dispositivo para reducir la redundancia de senales codificadas pcm |
JP50062051A JPS5129808A (it) | 1974-05-27 | 1975-05-26 | |
FR7516294A FR2273412B1 (it) | 1974-05-27 | 1975-05-26 | |
US05/580,914 US4005274A (en) | 1974-05-27 | 1975-05-27 | Pulse-code modulation communication system |
DE19752523492 DE2523492A1 (de) | 1974-05-27 | 1975-05-27 | System und einrichtung zur verminderung der redundanz von pcm-kodierten signalen |
BE156748A BE829537A (fr) | 1974-05-27 | 1975-05-27 | Procede et dispositif de transmission de signaux avec modulation par impulsions codees et avec reduction de redondance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT23193/74A IT1021020B (it) | 1974-05-27 | 1974-05-27 | Sistema e dispositivi di comunica zione con segnali codificati p.c.m. a ridondanza ridotta |
Publications (1)
Publication Number | Publication Date |
---|---|
IT1021020B true IT1021020B (it) | 1978-01-30 |
Family
ID=11204743
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT23193/74A IT1021020B (it) | 1974-05-27 | 1974-05-27 | Sistema e dispositivi di comunica zione con segnali codificati p.c.m. a ridondanza ridotta |
Country Status (10)
Country | Link |
---|---|
US (1) | US4005274A (it) |
JP (1) | JPS5129808A (it) |
AR (1) | AR208911A1 (it) |
BE (1) | BE829537A (it) |
DE (1) | DE2523492A1 (it) |
ES (1) | ES437780A1 (it) |
FR (1) | FR2273412B1 (it) |
GB (1) | GB1509233A (it) |
IT (1) | IT1021020B (it) |
NL (1) | NL7505563A (it) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH604409A5 (it) * | 1977-05-17 | 1978-09-15 | Landis & Gyr Ag | |
JPS5523603A (en) * | 1978-06-22 | 1980-02-20 | Nec Corp | Method and apparatus for coding and decoding of telephone signal |
CA1152650A (en) * | 1979-02-27 | 1983-08-23 | Ernst A. Munter | Pcm and pam conversion circuit including signal level variation on the pcm portion of the circuit |
FR2463549A1 (fr) * | 1979-08-10 | 1981-02-20 | Telecommunications Sa | Dispositif de reduction du debit numerique d'informations codees |
IT1128762B (it) * | 1980-02-20 | 1986-06-04 | Cselt Centro Studi Lab Telecom | Circuito per diagnosi di reti di connessione pcm |
USRE32124E (en) * | 1980-04-08 | 1986-04-22 | At&T Bell Laboratories | Predictive signal coding with partitioned quantization |
US4354057A (en) * | 1980-04-08 | 1982-10-12 | Bell Telephone Laboratories, Incorporated | Predictive signal coding with partitioned quantization |
US4386237A (en) * | 1980-12-22 | 1983-05-31 | Intelsat | NIC Processor using variable precision block quantization |
EP0085820B1 (fr) * | 1982-02-09 | 1985-11-21 | International Business Machines Corporation | Procédé de transmission numérique multi-vitesses et dispositif de mise en oeuvre dudit procédé |
US4481659A (en) * | 1982-02-11 | 1984-11-06 | Universite De Sherbrooke | Apparatus and method of reducing the bit rate of PCM speech |
US4513426A (en) * | 1982-12-20 | 1985-04-23 | At&T Bell Laboratories | Adaptive differential pulse code modulation |
DE3411962A1 (de) * | 1983-03-31 | 1984-10-31 | Sansui Electric Co., Ltd., Tokio/Tokyo | Datenuebertragungseinrichtung |
FR2545301B1 (fr) * | 1983-04-29 | 1986-07-25 | Telephonie Ind Commerciale | Procede de compression-decompression d'un signal de type vocal |
US4845499A (en) * | 1987-11-02 | 1989-07-04 | Ag Communication Systems Corporation | Method for generating PCM logarithmic values from linear values |
DE68911287T2 (de) * | 1988-06-08 | 1994-05-05 | Fujitsu Ltd | Codierer/decodierer. |
JP3531526B2 (ja) * | 1999-05-13 | 2004-05-31 | 日本電気株式会社 | 通信システム |
US10373630B2 (en) * | 2017-03-31 | 2019-08-06 | Intel Corporation | Systems and methods for energy efficient and low power distributed automatic speech recognition on wearable devices |
US11784731B2 (en) * | 2021-03-09 | 2023-10-10 | Apple Inc. | Multi-phase-level signaling to improve data bandwidth over lossy channels |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3471648A (en) * | 1966-07-28 | 1969-10-07 | Bell Telephone Labor Inc | Vocoder utilizing companding to reduce background noise caused by quantizing errors |
US3711650A (en) * | 1970-10-26 | 1973-01-16 | Logicon Inc | Adaptive pulse code modulation system |
US3806806A (en) * | 1972-11-20 | 1974-04-23 | Bell Telephone Labor Inc | Adaptive data modulator |
US3815124A (en) * | 1973-01-16 | 1974-06-04 | Westinghouse Electric Corp | Analog to digital converter |
-
1974
- 1974-05-27 IT IT23193/74A patent/IT1021020B/it active
-
1975
- 1975-05-12 NL NL7505563A patent/NL7505563A/xx not_active Application Discontinuation
- 1975-05-19 ES ES437780A patent/ES437780A1/es not_active Expired
- 1975-05-20 GB GB21437/75A patent/GB1509233A/en not_active Expired
- 1975-05-26 AR AR258946A patent/AR208911A1/es active
- 1975-05-26 JP JP50062051A patent/JPS5129808A/ja active Pending
- 1975-05-26 FR FR7516294A patent/FR2273412B1/fr not_active Expired
- 1975-05-27 US US05/580,914 patent/US4005274A/en not_active Expired - Lifetime
- 1975-05-27 BE BE156748A patent/BE829537A/xx unknown
- 1975-05-27 DE DE19752523492 patent/DE2523492A1/de not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
US4005274A (en) | 1977-01-25 |
BE829537A (fr) | 1975-09-15 |
AR208911A1 (es) | 1977-03-15 |
NL7505563A (nl) | 1975-12-01 |
ES437780A1 (es) | 1977-05-16 |
GB1509233A (en) | 1978-05-04 |
JPS5129808A (it) | 1976-03-13 |
FR2273412A1 (it) | 1975-12-26 |
FR2273412B1 (it) | 1979-01-19 |
DE2523492A1 (de) | 1975-12-11 |
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