TWM555596U - System for frequency modulating high definition composite video broadcast signals in wireless transmission environment - Google Patents

Abstract

The utility model provides a system for frequency modulating high definition composite video broadcast signals in wireless transmission environment, comprising: a transmitting unit and a receiving unit. An image sensor of the transmitting unit converts an image to a digital signal. A signal processor converts the digital signal to a composite video broadcast signal. A frequency modulator modulates the composite video broadcast signal to a first modulation signal. The receiving unit receives the first modulation signal. A low noise amplifier converts the first modulation signal to a second modulation signal. A frequency demodulator restores the second modulation signal to the composite video broadcast signal. After an image decoder decoding the composite video broadcast signal, the image decoder outputs a digital signal with a specific format.

Description

High-resolution composite video broadcast signal frequency modulation system for wireless transmission environment

The present invention relates to the technical field of image processing, and more particularly to a high-resolution composite video broadcast signal frequency modulation system using a frequency modulation high-resolution composite video broadcast signal for use in a wireless transmission environment.

Due to the limitations of the original NTSC specification, the current Composite Video Broadcast Signal (CVBS) can only transmit composite video with standard resolution (for example, 640×480) in the wireless transmission environment.

Moreover, in a wireless transmission environment (for example, in the field of drone photography), if a real-time video signal is to be obtained by wireless transmission, only a standard resolution composite video format or a high-resolution digital video signal can be used. However, if the existing high-resolution digital image signal is used, the digital compression/decompression process must be performed on the transmitting end and the receiving end of the signal to effectively transmit in the wireless transmission environment, but this method cannot achieve the real-time image. The effect is that there is a high degree of delay, which is a big drawback for the need for instant images in a wireless transmission environment. Also, the use of standard resolution composite video formats does not meet the needs of high resolution.

Therefore, there is still room for improvement in the prior art for transmitting high resolution video formats in a wireless transmission environment.

The purpose of the present invention is to provide a composite video broadcast signal modulation system, comprising: a transmitting end, comprising: an image sensor for converting the sensed image into a digital signal; and a signal processor for the digital signal Converting into a composite video broadcast signal; and a frequency modulator for converting the composite video broadcast signal into a first modulated signal; and receiving, receiving the first modulated signal, the receiving end comprising: low noise An amplifier for amplifying the first modulated signal to a second amplitude modulated signal; the frequency demodulator is configured to restore the second modulated signal to the composite video broadcast signal; and the image decoder And the decoded composite video broadcast signal is decoded to output a digital signal in a specific format.

The composite video broadcast signal modulation system of the present invention can transmit high-resolution composite video broadcast signals in a wireless transmission environment by frequency modulation, without having to transmit high-resolution digital images as in the prior art. Digital compression/decompression function, so you can get instant high-resolution video signals in analogy with the signal. And because there is no need for additional digital compression/decompression functions, the related hardware components can be omitted, and the power saving, low load, and low cost are more effective.

1‧‧‧transmitter

11‧‧‧ lens

12‧‧‧Image sensor

13‧‧‧Signal Processor

14‧‧‧frequency modulator

15‧‧‧Power Amplifier

16‧‧‧Antenna

2‧‧‧ Receiver

21‧‧‧Antenna

22‧‧‧Low noise amplifier

23‧‧‧ frequency demodulator

231‧‧‧Downer

232‧‧‧Intermediate frequency surface acoustic wave filter

233‧‧‧Differentiator

24‧‧‧Image Decoder

31‧‧‧Light

32‧‧‧Digital signal

33, 43‧‧‧Complex video broadcast signal

34‧‧‧First modulation signal

35, 41‧‧‧Amplified first modulation signal

42‧‧‧Second modulation signal

44‧‧‧Digital signals in specific formats

5‧‧‧Radio waves

S11~S17‧‧‧Steps

The first picture is a schematic diagram of the system architecture of the high-resolution composite video broadcast signal frequency modulation system.

The second figure is a schematic flow chart of the steps of the high-resolution composite video broadcast signal frequency modulation method.

The embodiments of the present invention are described below by way of specific embodiments, and those skilled in the art can easily understand other advantages and functions of the present invention by the contents disclosed in the present specification, and may also use other different embodiments. Implement or apply.

Referring to FIG. 1 , the high resolution composite video broadcast signal frequency modulation system of the present invention may include a transmitting end 1 and a receiving end 2 . The transmitting end 1 includes a lens 11, an image sensor 12, a signal processor 13, a frequency modulator 14, a power amplifier 15, and an antenna 16. The receiving end 2 includes an antenna 21, a low noise amplifier 22, a frequency demodulator 23, and a video decoder 24.

The image sensor 12 is configured to convert the sensed image into a digital signal 32. In detail, the front end of the image sensor 12 is provided with a lens 11 which can focus the light so that the focused light 31 can fall on the image sensor 12, so that the image sensor 12 senses the generated image. In an embodiment, the lens 11 can be replaced as needed.

The image sensor 12 is a photovoltaic element, such as a Complementary Metal-Oxide-Semiconductor (CMOS) sensor, which converts the light 31 into a digital signal 32. In one embodiment, the image sensor 12 converts the sensed image into a high resolution such as 1280×720, 1280×960, 1920×1080, or 3840×2160. Digital image signal.

The signal processor 13 receives the digital signal 32 for converting the digital signal 32 into a composite video broadcast signal 33. In detail, the signal processor 13 first separates the digital signal 32 from the luminance signal and the chroma signal, filters the luminance signal at the first specific frequency, and demodulates the chroma signal at the second specific frequency. The filtered luminance signal and the demodulated chroma signal are encoded together as a composite video broadcast signal 33. The composite video broadcast signal 33 can be an analog signal of a high resolution composite video with a resolution of 1280×720, 1280×960, 1920×1080 or 3840×2160.

In one embodiment, the first specific frequency is 9.7 MHz and the second specific frequency is 11.475 MHz. In still another embodiment, the first specific frequency is 21.8 MHz and the second specific frequency is 24 MHz. This creation is not limited to this.

The frequency modulator 14 receives the composite video broadcast signal 33 and converts it into a first modulation signal 34. In detail, the frequency modulator 14 converts the composite video broadcast signal 33 into an Industrial Scientific Medical (ISM) frequency band with a frequency modulation of 28 MHz to 108 MHz by frequency modulation (FM). The first modulation signal 34, wherein the ISM frequency band is 5.8 GHz or 2.4 GHz. In order to make the first modulation signal 34 can propagate further, the first modulation signal 34 can be sent to the power amplifier 15 to amplify the amplitude of the first modulation signal 34. Thereafter, the amplified first modulation signal 35 can be transmitted through the antenna 16.

The transmitting end 1 and the receiving end 2 communicate with each other through the radio wave 5, and the receiving end 2 can receive the amplified first modulated signal 35 sent by the antenna 16 of the transmitting end 1 through the antenna 21 (for example, a wireless transmission environment), that is, The antenna 21 can collect radio waves having a frequency in the ISM band (5.8 GHz or 2.4 GHz). Because the amplitude of the collected radio waves is too small and the signal is weak, Therefore, the antenna 21 of the receiving end 2 can send the received amplified first modulation signal 41 to the low noise amplifier 22 to amplify the amplified first modulation signal 41 to the second modulation signal 42 with the same amplitude. . The second modulation signal 42 is then sent to the frequency demodulator 23.

The frequency demodulator 23 is configured to convert the second modulation signal 42 to the composite video broadcast signal 43. Specifically, the frequency demodulator 23 includes a down converter 231, an intermediate frequency surface acoustic wave filter 232, and a differentiator 233. The second modulation signal 42 first enters the downconverter 231, and the downconverter 231 is used to reduce the second modulation signal 42 to a frequency signal of 480 MHz. Then, the intermediate frequency signal enters the intermediate frequency surface acoustic wave filter 232 for filtering. In one embodiment, the intermediate frequency surface acoustic wave filter 232 is a band pass filter having a center frequency of 480 MHz and a bandwidth of 28 MHz to 108 MHz. The purpose of the IF surface acoustic wave filter 232 filtering is to reduce the noise interference, so that the subsequently demodulated composite video broadcast signal 43 has no noise. The intermediate frequency signal is filtered by the intermediate frequency surface acoustic wave filter 232, and then enters the differentiator 233 to convert the filtered intermediate frequency signal to the composite video broadcast signal 43 and send it to the video decoder 24. The composite video broadcast signal 43 can be an analog signal of a high resolution composite video with a resolution of 1280×720, 1280×960, 1920×1080 or 3840×2160.

The video decoder 24 decodes the modulated reduced composite video broadcast signal 43 to output a digital signal 44 of a particular format. In an embodiment, the image decoder 24 can adjust the brightness and chroma of the image while decoding, and then output the digital signal 44 of the specific format. In still another embodiment, the specific format is BT 656 format, BT 1120 format, and HDMI format. Or Display Port format, but this creation is not limited to this.

Finally, the user can view the high-resolution picture in real time according to the digital signal of the specific format outputted and connected to the corresponding monitoring device.

Referring to FIG. 2, the high-resolution composite video broadcast signal frequency modulation method of the present invention is applied to the high-resolution composite video broadcast signal frequency modulation system. The following technical contents are not described in detail herein. The step of the high-resolution composite video broadcast signal frequency modulation method of the present invention is as follows: in step S11, the image sensor in the transmitting end converts the image sensed by the image sensor into a digital signal, and then proceeds to Step S12: In step S12, the signal processor of the transmitting end converts the digital signal into a composite video broadcasting signal, and then proceeds to step S13. In step S13, the frequency modulator of the transmitting end converts the composite video broadcast signal into a first modulated signal to transmit the first modulated signal through the antenna, and then proceeds to step S14; in step S14, The antenna in the receiving end receives the first modulation signal, and then proceeds to step S15. In step S15, the low noise amplifier of the receiving end amplifies the first modulation signal to a second modulation signal with the same amplitude. Going to step S16; in step S16, the frequency demodulator of the receiving end adjusts the second modulated signal to the composite video broadcast signal, and then proceeds to step S17; in step S17, The image decoder at the receiving end decodes the modulated composite broadcast broadcast signal to output a digital signal of a specific format.

In an embodiment, the image sensor in step S11 converts the sensed image into a high-resolution digital image signal having a resolution of 1280×720, 1280×960, 1920×1080, or 3840×2160. .

In an embodiment, the signal processor in step S12 first separates the digital signal from the luminance signal and the chroma signal, and filters the luminance signal at the first specific frequency, and the color is filtered at the second specific frequency. After demodulating the signal, the filtered luminance signal and the demodulated color signal are encoded together as the composite video broadcast signal. Wherein, the first specific frequency is 9.7 MHz and the second specific frequency is 11.475 MHz, or the first specific frequency is 21.8 MHz and the second specific frequency is 24 MHz.

In an embodiment, the first modulation signal modulated by the frequency modulator in step S13 is an ISM frequency band and has a bandwidth between 28 MHz and 108 MHz. Moreover, after the frequency modulator converts the composite video broadcast signal into the first modulation signal, the amplitude of the first modulation signal is amplified by the power amplifier, and then transmitted through the antenna.

In an embodiment, the antenna in the receiving end in step S14 is configured to receive the first modulation signal in the ISM band.

In an embodiment, step S16 further includes the steps of: causing the downconverter to reduce the second modulated signal to a frequency signal of 480 MHz; and causing the intermediate frequency surface acoustic wave filter to filter the intermediate frequency signal; And causing the differentiator to convert the filtered intermediate frequency signal to the composite video broadcast signal. The IF surface acoustic wave filter is a band pass filter having a center frequency of 480 MHz and a bandwidth of 28 MHz to 108 MHz.

In an embodiment, the specific format output by the image decoder of step S17 is BT 656 format, BT 1120 format, HDMI format or Display Port format.

High resolution composite video broadcast signal frequency modulation by this creation The system can transmit high-resolution composite video broadcast signals in a wireless transmission environment by means of Frequency Modulation (FM), without having to perform digital compression/solution as in the prior art for transmitting high-resolution digital images. The compression function is also not limited to the packet format of the existing wireless transmission environment (for example, WiFi), so that an analog video signal with instant and no delay (or low delay) can be obtained, and the related compression/decompression hardware components can be omitted. It also has the effect of saving electricity, low load and low cost.

The above embodiments are merely illustrative of the technical principles, features, and effects of the present invention, and are not intended to limit the scope of implementation of the present invention. Anyone skilled in the art can do so without departing from the spirit and scope of the present invention. The above embodiments are modified and changed. However, any equivalent modifications and alterations made using the teachings of this creation should be covered by the scope of the patent application below. The scope of protection of this creation shall be as set forth in the scope of the patent application below.

1‧‧‧transmitter

11‧‧‧ lens

12‧‧‧Image sensor

13‧‧‧Signal Processor

14‧‧‧frequency modulator

15‧‧‧Power Amplifier

16‧‧‧Antenna

2‧‧‧ Receiver

21‧‧‧Antenna

22‧‧‧Low noise amplifier

23‧‧‧ frequency demodulator

231‧‧‧Downer

232‧‧‧Intermediate frequency surface acoustic wave filter

233‧‧‧Differentiator

24‧‧‧Image Decoder

31‧‧‧Light

32‧‧‧Digital signal

33, 43‧‧‧Complex video broadcast signal

34‧‧‧First modulation signal

35, 41‧‧‧Amplified first modulation signal

42‧‧‧Second modulation signal

44‧‧‧Digital signals in specific formats

5‧‧‧Radio waves

Claims (11)

A high-resolution composite video broadcast signal frequency modulation system for use in a wireless transmission environment, comprising: a transmitting end, comprising: an image sensor for converting the sensed image into a digital signal; a signal processor for Converting the digital signal into a composite video broadcast signal; and a frequency modulator for converting the composite video broadcast signal into a first modulated signal; and receiving, receiving the first modulated signal, the receiving end includes a low noise amplifier for amplifying the first modulated signal to a second amplitude modulated signal; the frequency demodulator is configured to restore the second modulated signal to the composite video broadcast signal; And a video decoder for decoding the modulated composite video broadcast signal to output a digital signal of a specific format. The high-resolution composite video broadcast signal frequency modulation system according to claim 1, wherein the signal processor first separates the digital signal from the luminance signal and the chroma signal, and the first specific frequency is The luminance signal is filtered, and the chroma signal is demodulated at a second specific frequency, and the filtered luminance signal and the demodulated chroma signal are encoded together as the composite video broadcast signal. High-resolution composite video broadcasting as described in claim 2 The signal frequency modulation system, wherein the first specific frequency is 9.7 MHz, and the second specific frequency is 11.475 MHz. The high-resolution composite video broadcast signal frequency modulation system according to claim 2, wherein the first specific frequency is 21.8 MHz, and the second specific frequency is 24 MHz. The high-resolution composite video broadcast signal frequency modulation system according to claim 1, wherein the first modulation signal modulated by the frequency modulator is an ISM frequency band and has a bandwidth of 28 MHz to 108 MHz. between. The high-resolution composite video broadcast signal frequency modulation system according to claim 1, wherein the transmitting end further includes a power amplifier and an antenna, wherein the power amplifier is configured to amplify the amplitude of the first modulated signal. Transmitted through the antenna. The high-resolution composite video broadcast signal frequency modulation system of claim 1, wherein the receiving end further comprises an antenna, and the antenna is configured to receive the first modulation signal in the ISM frequency band. The high-resolution composite video broadcast signal frequency modulation system according to claim 1, wherein the frequency demodulator further comprises a frequency reducer, an intermediate frequency surface acoustic wave filter and a differentiator, wherein the frequency reducer is used for The second modulation signal is reduced to a frequency signal of 480 MHz, and the intermediate frequency surface acoustic wave filter filters the intermediate frequency signal, and the differentiator is configured to restore the filtered intermediate frequency signal to the frequency signal. Composite video broadcast signal. High-resolution composite video broadcasting as described in claim 8 The signal frequency modulation system, wherein the intermediate frequency surface acoustic wave filter is a band pass filter having a center frequency of 480 MHz and a bandwidth of 28 MHz to 108 MHz. The high-resolution composite video broadcast signal frequency modulation system according to claim 1, wherein the image sensor converts the sensed image into a resolution of 1280×720, 1280×960, 1920. ×1080 or 3840×2160 digital image signals. The high-resolution composite video broadcast signal frequency modulation system according to claim 1, wherein the specific format is a BT 656 format, a BT 1120 format, an HDMI format, or a Display Port format.