FR2234707A1 - Low-noise digital communication system - converts amplitudes into digital signals using clock pulse counter and comparator - Google Patents
Low-noise digital communication system - converts amplitudes into digital signals using clock pulse counter and comparatorInfo
- Publication number
- FR2234707A1 FR2234707A1 FR7322425A FR7322425A FR2234707A1 FR 2234707 A1 FR2234707 A1 FR 2234707A1 FR 7322425 A FR7322425 A FR 7322425A FR 7322425 A FR7322425 A FR 7322425A FR 2234707 A1 FR2234707 A1 FR 2234707A1
- Authority
- FR
- France
- Prior art keywords
- signal
- bits
- converted
- low
- amplitude
- 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
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/34—Analogue value compared with reference values
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Theoretical Computer Science (AREA)
- Dc Digital Transmission (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The low-noise digital telecommunications system converts amplitude of the analog information signals into a digital code for transmission. At the transmitter, clock pulses are counted and the sum converted into an analog signal whose amplitude is then compared with the information signal's amplitude sample. When the converted signal's amplitude is signal to the information signal's, the coupling process is stopped and the contents transmitted as the digital code. At the receiver, the n-bits of transmitted information are converted into p-bits (p>n): The sequence of levels chosen for the p-bits is such that the distance between two consecutive level is least. The p-bits are then converted into an analog output signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7322425A FR2234707A1 (en) | 1973-06-20 | 1973-06-20 | Low-noise digital communication system - converts amplitudes into digital signals using clock pulse counter and comparator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7322425A FR2234707A1 (en) | 1973-06-20 | 1973-06-20 | Low-noise digital communication system - converts amplitudes into digital signals using clock pulse counter and comparator |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2234707A1 true FR2234707A1 (en) | 1975-01-17 |
FR2234707B1 FR2234707B1 (en) | 1976-09-17 |
Family
ID=9121233
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7322425A Granted FR2234707A1 (en) | 1973-06-20 | 1973-06-20 | Low-noise digital communication system - converts amplitudes into digital signals using clock pulse counter and comparator |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2234707A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1299859A (en) * | 1969-03-24 | 1972-12-13 | Nippon Electric Co | Improvements in or relating to companding encoders and decoders |
-
1973
- 1973-06-20 FR FR7322425A patent/FR2234707A1/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1299859A (en) * | 1969-03-24 | 1972-12-13 | Nippon Electric Co | Improvements in or relating to companding encoders and decoders |
Also Published As
Publication number | Publication date |
---|---|
FR2234707B1 (en) | 1976-09-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |