Claims
- 1. Data-reducing coding method for transmitting information from a transmitter to a receiver, comprising the steps of:
- sampling the analog information (PAM) with predetermined sampling frequency;
- quantifying the sampling values;
- storing the quantified sampling values in memory;
- determining an optimal reference level for a sequence of quantified sampling values, for sections of a line, of plural lines, of a block, of plural blocks;
- coding the reference level and the quantified sampling values on the basis of the determined reference level;
- coding subsequently occurring equal values in the sequence of quantified sampling values, in the sections of a line, of plural lines, of a block, of plural blocks such that the coded number of subsequently occurring equal values is provided in combination with said equal value;
- transmitting the coded reference level, the coded values and a predetermined code to the receiver; and
- evaluating the transmitted values on the basis of the transmitted reference level and of the transmitted predetermined code at the receiver.
- 2. Coding method in accordance with claim 1, characterized in that numbers are coded digit-by-digit (e.g. 28 by code word 2 and by code word 8).
- 3. Coding method in accordance with claim 1, characterized in that the coding method is used with telefax, digital speech transmission and/or television.
- 4. Coding method in accordance with claim 1, characterized in that for telefax the gray tones are transformed at the receiver in accordance with the Dither process.
- 5. Coding method in accordance with claim 1, characterized in that the reference level is determined either by a maximum level value or by a minimum level value for the sequence of quantified sampling values, for the sections of a line, of plural lines, of a block, of plural blocks.
- 6. Coding method in accordance with claim 1, characterized in that color separations of base colors are coded and transmitted for colored image patterns for telefax and television.
- 7. Coding method in accordance with claim 1, characterized in that a digital amplitude/phase code with reference phase relation and with leading or lagging phase relations is provided as a code for transmitting the quantified sampling values on the basis of the determined reference level.
Priority Claims (2)
Number |
Date |
Country |
Kind |
42 05 570.9 |
Feb 1992 |
DEX |
|
42 37 596.7 |
Nov 1992 |
DEX |
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CROSS-REFERENCE TO RELATED APPLICATION
This application is a division of application Ser. No. 08/108,594, filed on Sep. 3, 1993, which is the U.S. National Phase Application of PCT/EP92/02977, filed on Dec. 23, 1992.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0329158 |
Aug 1989 |
EPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
108594 |
Sep 1993 |
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