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Method using synchronous signal to control equalizer in digital residual sideband system and its device

A synchronous signal and vestigial sideband technology, applied in digital transmission systems, equalizers, baseband systems, etc., can solve problems such as short delay time and large size, system performance deterioration, and long initial running time

Inactive Publication Date: 2004-10-27
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

[0008] Incidentally, since the conventional digital VSB system uses the data segment sync signal to perform the symbol timing conversion, the system usually runs after the sync signal separation is completed, and the initial run time is longer
Moreover, since the sync signal separation is done before the equalizer to generate ghosts with short delay time and large size, it is impossible to separate and detect the correct sync signal due to the influence of ghosts, resulting in a loss of system performance. deterioration

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  • Method using synchronous signal to control equalizer in digital residual sideband system and its device
  • Method using synchronous signal to control equalizer in digital residual sideband system and its device
  • Method using synchronous signal to control equalizer in digital residual sideband system and its device

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Embodiment Construction

[0017] Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0018] image 3 The digital vestigial sideband system (VSB) shown in includes an oscillator 100 generating a fixed-frequency clock, and an analog-to-digital (A / D) conversion for converting a received analog signal into digital form according to the fixed-frequency clock generated by the oscillator 100 2, and an interpolation filter 200 connected between the A / D converter 2 and the matched filter 6, for interpolating samples of digitally received data and adjusting the timing phase. Here, the interpolation filter 200 is controlled by the output of the symbol timing recovery unit 4 . The carrier recovery unit is configured by a digital frequency phase locked loop (DFPLL), which is a digital signal processing based carrier recovery unit and carrier recovers the output signal of the interpolation filter 200 in digital form. image 3 The system includes a multipl...

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Abstract

A method and apparatus for controlling an equalizer using a sync signal in a digital VSB system is provided, in which the sync signal is accurately separated even though a ghost having a short delay time and a large size is generated, and thus the equalizer is controlled with the separated sync signal. For this purpose, a switching unit is provided between a matched filter and an equalizer, which selects one of two input signals according to a NTSC rejection filter (NRF) on / off control signals and separates a data segment sync signal and a data field sync signal from the selected signal. A control signal is produced via the separated sync signal to control the equalizer to operate at one mode of a blind mode and a training sequence mode. Since the equalizer performs sync signal separation by using the ghost removed signal, a system initial operational time becomes shorter, and accurate sync signal separation is possible even if severe ghosts occur, to thereby improve degeneration of system performance greatly.

Description

technical field [0001] The present invention relates to the control of the equalizer in the digital vestigial sideband (VSB) system, relate in particular to the method and the device that use synchronous signal to control the equalizer in the digital VSB system, wherein even if the ghost with short delay time and large size is produced, The sync signal can also be separated correctly, and the equalizer is controlled with the split sync signal, thus greatly improving the system performance. Background technique [0002] Digital broadcasting, which provides video and audio information for multimedia services, has been commercialized all over the world. In order to realize digital broadcasting, it is very important to provide modulation and demodulation techniques capable of exhibiting a sufficient bit transmission rate so that video and audio signals are transmitted through a broadcast channel having a predetermined bandwidth. The US-oriented terrestrial digital broadcasting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04N7/015H04L27/00H04N5/21
CPCH04L2025/03796H04L2025/03382H04L2025/0377H04L2027/0095H04N5/211H04N7/015
Inventor 金基范
Owner SAMSUNG ELECTRONICS CO LTD
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