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Radio frequency modulator for television systems

A technology of radio frequency modulator and TV system, applied in electrical components, image communication, selective content distribution, etc., can solve the problems of color distortion, difference frequency interference, etc., and achieve the effect of good sound, small signal attenuation, and short circuit.

Inactive Publication Date: 2017-05-03
眭志祥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with its signal, there are problems of nonlinear color distortion and difference frequency interference

Method used

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  • Radio frequency modulator for television systems

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] Depend on figure 1 As we all know, radio frequency modulators for TV systems include channel carrier frequency oscillators, sound modulation, video modulation, channel filters, buffer amplifier circuits, AV, RF adjustable level attenuation circuits, radio frequency matching, channel mixers, and frequency band mixing device, DC power supply, power switch, LED indicator light and casing, the chip circuit is set on the electronic circuit board, the radio frequency output end of the chip circuit is connected with the channel filter circuit, and the channel filter is connected with the channel mixer, the said The output port of the frequency band filter is connected with the output port of the channel mixer to form an RF output port, and the RF output port outputs signals of 30 channels and is connected to the cable TV LAN.

[0011] The power consumption of the whole machine is 220V / 30W low-power energy-saving products. All system connection lines are connected and debugged ...

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Abstract

A radio frequency modulator for television systems comprises a channel carrier frequency oscillator, an aural modulator, a video modulator, a channel filter, a buffer amplifier circuit, an AV, an RF adjustable-level attenuation circuit, a radio frequency matcher, a channel mixer, a band mixer, a DC power supply, a power switch, an LED indicator lamp, and a case. A chip circuit is arranged on an electronic circuit board. The radio frequency output end of the chip circuit is connected with a channel filter circuit. The channel filter is connected with the channel mixer. The radio frequency modulator is characterized in that the output port of the band filter and the output port of the channel mixer are connected to be an RF output end, and the port of the RF output end outputs the signals of 30 channels to be connected with a cable television local area network. Frequency resources within the frequency range from 47MHz and 862MHz are fully utilized. A frequency-isolating transmission mode is realized. The color of television images is brighter and clearer, and the accompanying sound is good.

Description

technical field [0001] The invention relates to a modulator for converting AV multi-channel video signals into one output full-channel signal, which belongs to the television transmission technology. Background technique [0002] The progress of complementary metal-oxide semiconductor CMOS manufacturing technology has promoted the increase of the component density of integrated circuits, and the reaction rate has increased compared with small-volume transistors. For the 0.8μm CMOS process, the fastest response rate can reach 200MHz. Therefore, it is located in the TV very high frequency VHF band, a radio frequency modulator with a frequency range of 50MHz to 100MHz. It can already be done in CMOS technology. [0003] Traditional radio frequency modulators are all made with bipolar technology. Products currently on the market include SONY CX20138 bipolar integrated circuit IC, and products similar to Forward Electronics Co., Ltd.'s MDMT2A, which are assembled with bipolar ...

Claims

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Application Information

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IPC IPC(8): H04N21/2383
CPCH04N21/2383
Inventor 眭志祥
Owner 眭志祥