Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for controlling zero digit summation variation amount in signal modulating/coding

A technology of signal modulation and variation, applied in electrical digital data processing, digital recording/reproduction, digital data processing components, etc., can solve problems such as large memory size, waste of memory space, and complicated methods

Inactive Publication Date: 2009-04-08
MEDIATEK INC
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] And the look-up table of existing relevant data memory can record the channel bit data of each 14-bit length and the related data of 4 interval bits respectively, so its memory size is very large, quite wastes memory space, and interval bit generator calculates DSV's approach is too complex

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for controlling zero digit summation variation amount in signal modulating/coding
  • Method and device for controlling zero digit summation variation amount in signal modulating/coding
  • Method and device for controlling zero digit summation variation amount in signal modulating/coding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] First introduce the Zero Digital Sum Variation (ZDSV for short), the so-called ZDSV is to assign a negative sign (-1) to each bit of '0' in the NRZI signal at a low level, and assign a high level to A plus sign (+1). Please refer to Figure 3a , which shows that when the initial value of the NRZI signal is low, the DSV is compared with the ZDSV when there are an odd number of '1's in all bits. Comparing the NRZI signal with the first channel bit (efm1), ZDSV is '0' at the beginning, then the first bit '0' is at low level, so ZDSV is accumulated as '-1', and then three '100' are at high level Level, there are two '0', so ZDSV accumulation is '+1' (-1+2=+1), then four '1000' in low level, there are three '0', so ZDSV accumulation is '-2' (-1+2-3=-2), the last six '100000' are at high level, and there are five '0's, so the ZDSV accumulation is '+3' (-1 +2-3+5=+3).

[0046] According to this principle, at t2, ZDSV (efm1 and m2) accumulated to '+1', at t3, ZDSV (efm1, m2...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention utilizes zero digital sum variable quantity to derivate digital sum variable quantity and it can obtain optimum gap digit located between frequency channels. The present invention is able to use much smaller searth table to finalize calculation for digital sum variable quantity and to use more simple manner to find gap digit.

Description

technical field [0001] The present invention relates to a method and device for controlling the variation of digital sum, and in particular relates to a method and device for obtaining the variation of digital sum by using zero digital sum variation and obtaining the optimal interval. Background technique [0002] In the current compact disk (hereinafter referred to as CD) system, analog (analog) signals undergo sampling (sampling) and analog / digital conversion (A / D) to become many 16-bit (16bits) data, and this data Then it is divided into two 8-bit bytes (byte), which can also be called symbols (symbol). Due to the optical characteristics of the optical drive, if these symbols are directly written into the CD, the optical drive will have a lot of symbols when reading. problem arises. [0003] In order to solve these problems, each symbol must be subjected to eight to fourteen modulation (Eight-to-Fourteen-Modulation, hereinafter referred to as EFM), so that each symbol be...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/46G11B20/14G06F7/00
Inventor 吴文义潘志新
Owner MEDIATEK INC