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Demodulator and corresponding demodulating method thereof

A demodulation method and a technology for a modulator, applied in the field of demodulators, can solve problems such as high energy consumption, and achieve the effects of less energy consumption, simple circuit, and less electronic components

Inactive Publication Date: 2009-09-02
FITIPOWER INTEGRATED TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Because the superheterodyne demodulation method needs to adopt a sharpening bandpass (intermediate frequency) filter to filter out unwanted radio frequency signals (RF Signals), and this sharpening bandpass (intermediate frequency) filter is a standard with high requirements, A rather complex circuit that requires a large number of electronic components and consumes a lot of power
In order to reduce the high requirements for the sharpening bandpass (IF) filter, an image rejection circuit (Imaging RejectionCircuit) can be added to the system, but it still needs the sharpening bandpass (IF) filter to meet certain requirements. limits

Method used

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  • Demodulator and corresponding demodulating method thereof

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Embodiment Construction

[0017] The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0018] What the present invention relates to is applicable to the demodulator of ATSC, NTSC, PAL, SECAM, VSB and SSB standard system and corresponding demodulation method, but, in order to better understand the present invention, at first briefly introduce to be applicable to ATSC, Related processes of video signal modulation of NTSC, PAL, SECAM, VSB and SSB standard systems. And in the present embodiment, take the video signal of SSB standard system as example to carry out modulation and demodulation, certainly, ATSC, NTSC, PAL, SECAM, the video signal of VSB standard system also can be as the method described in this embodiment to It performs modulation and demodulation.

[0019] First, the video signal S(t) of the SSB standard system is simulated using an analysis method. see figure 1 , according to the Fourier principle, if the video...

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Abstract

The invention relates to a demodulator, which is applicable to ATSC, NTSC, PAL, SECAM, VSB and SSB standard systems, and comprises an antenna for receiving a radio-frequency signal, a low-noise amplifier that is electrically connected with the antenna, a first frequency mixer, a second frequency mixer, a low-pass wave filter and a signal processor. The first frequency mixer is electrically connected with the low-noise amplifier so as to lead the radio-frequency signal to be frequency-mixed with a first local oscillating signal, thus generating a first output signal. The second frequency mixer is electrically connected with the low-noise amplifier so as to lead the radio-frequency signal to be frequency-mixed with a second local oscillating signal, thus generating a second output signal. The low-pass wave filter is respectively and electrically connected with the first frequency mixer and the second frequency mixer so as to implement the low-pass wave filtering of the first output signal and the second output signal, thus respectively generating a first baseband signal and a second baseband signal. The signal processor implements the recovering processing of the first baseband signal and the second baseband signal so as to restore and obtain an original video signal.

Description

technical field [0001] The present invention relates to a kind of demodulator and corresponding demodulation method thereof, relate in particular to a kind of for ATSC (Advanced Television Systems Committee, American Advanced Television System Committee), NTSC (National Television System Committee, American National Television Standards Committee), PAL (Phase Alternating Line, phase-inversion system), VSB (Vestigial Side Band, vestigial sideband system), SECAM (SequentialCouleur Avec Memoire, Sekon system), and SSB (Single Side Band, single sideband system) and other standards The demodulator in the system and its corresponding demodulation method. Background technique [0002] Digital Television (Digital Television) is a television system developed to provide a strong theater atmosphere at home. Compared with the widely used analog TV, it greatly improves the clarity and width of the picture, and provides CD (Compact Disc) level multi-channel audio. For digital TV, countr...

Claims

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Application Information

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IPC IPC(8): H04N5/455H04N5/46
Inventor 张远成
Owner FITIPOWER INTEGRATED TECH INC
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