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Digital modulator

A digital modulator, digital signal technology, applied in digital filters, digital transmission systems, digital technology networks, etc., can solve the problems of inflexibility of the system, not allowing the continuous use of the symbol frequency range, and increasing complexity.

Inactive Publication Date: 2006-04-26
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although existing techniques can handle several symbol frequencies, the complexity of this processing increases with the symbol frequency used
Furthermore, this system is rather inflexible since it does not allow the continuous use of the symbol frequency range

Method used

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  • Digital modulator
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Embodiment Construction

[0021] The present description of the invention relates to an exemplary digital modulator DM used in the field of cable-based interactive means. In this field, digital signals are exchanged over physical channels such as coaxial cables and optical fibers for hybrid transmission. The digital modulator DM allows these signals to be transmitted via such a channel. figure 1 A schematic diagram showing the structure of the modulator DM. Said modulator comprises a clock frequency Fclk, error detection means ENC, scrambling means RAND, marking means MAP, first filtering means FIR, insertion means INT and modulating means MOD for modulating at a carrier frequency Fca.

[0022] The digital modulator DM receives as input a digital signal DS from one or more sources such as the memory of a cable modem. Said signal DS consists of bytes and is transmitted according to a first frequency Fby in bytes / second. In order to transmit said digital signal DS on the channel, the modulator transmi...

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Abstract

The present invention relates to a digital modulator (DM) and to an associated modulation method. The digital modulator (DM) includes a clock frequency (Fclk) and processes a digital signal (S(TA)) sampled at the symbol frequency (Fsy) Symbol (SYMB) composition. It is characterized in that the insertion means (INT) inserts a new sample (OUT) according to the insertion parameter (δ, SIGN) and the signal (LS, TS, F0, F2) obtained from the digital signal (S(TA)), the insertion parameter (δ,SIGN) is calculated as a function of a variable and the actual ratio (R) of the symbol frequency (Fsy) to the clock frequency (Fclk).

Description

technical field [0001] The invention relates to a digital modulator comprising a clock frequency and capable of processing a digital signal consisting of symbols sampled at the symbol frequency. The invention also relates to a method of processing signals suitable for said modulator. The digital modulator finds particular application in the transmission of digital signals over wired media such as cables, air media such as electric waves, or optical media such as optical fibers. Background technique [0002] Patent FR2753590 filed on September 19, 1996, corresponding to patent US6134225 filed on September 17, 1997, describes a system for digital transmission via satellite. The system includes a digital modulator. The modulator includes an oscillator that generates a fixed clock frequency. In the transmission system of digital signals, the signals are processed into symbols for transmission. The symbol frequency is related to the transmission of these symbols. For example...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/36H04N7/10H04B7/15H03H17/00H03H17/06H04L7/02H04L7/04H04L27/20
CPCH03H17/0628H03H17/0642H03H2218/08H04L7/0029H04L7/0091H04L7/04
Inventor J·-C·贝格吉安
Owner NXP BV