CN110752875B - Visible light voice image hybrid transmission system and method based on light intensity - Google Patents
Visible light voice image hybrid transmission system and method based on light intensity Download PDFInfo
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- CN110752875B CN110752875B CN201911200755.5A CN201911200755A CN110752875B CN 110752875 B CN110752875 B CN 110752875B CN 201911200755 A CN201911200755 A CN 201911200755A CN 110752875 B CN110752875 B CN 110752875B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
Abstract
The invention discloses a visible light voice image hybrid transmission system and method based on light intensity. The transmitting end is composed of two parts, wherein one part is used for collecting image data in a JPEG format, the other part is used for collecting voice data, two kinds of data are respectively transmitted through two LED driving circuits, two paths of LED lights are simultaneously projected onto a single photoelectric detector through setting relative positions, the receiving end converts optical signals into electric signals and then transmits the electric signals to the interior of the FPGA through an AD module, then the two paths of light intensities are judged and processed, and corresponding voice data and image data are separated. Image data is sent to the upper computer, and voice signals are sent to the loudspeaker, so that real-time voice and image transmission can be carried out. The invention not only reduces the transmission rate, but also makes the receiving end recovery simpler.
Description
Technical Field
The invention relates to the technical field of visible light communication, in particular to a visible light voice image hybrid transmission system and method based on light intensity.
Background
With the rapid development of society and the popularization of various electronic products and intelligent devices, wireless spectrum resources become more and more deficient, and Visible Light Communication (VLC) has attracted the common attention of researchers at home and abroad as an emerging Communication technology due to its advantages of higher transmission rate, wider practicability, higher security, and the like. In addition, the most widely used LED lamp is used as a light source for visible light communication, so that the visible light communication has dual functions of communication and illumination. At present, visible light communication has become a hot research direction in the field of wireless communication, and the application prospect of the visible light communication is very wide.
The existing visible light fixed communication technology only performs single real-time voice data transmission or single image transmission communication mostly due to the limitation of the speed, and especially for the transmission of image data, the requirement on a hardware circuit is high if the real-time transmission is required due to the huge data volume, and if voice data is added, the speed is higher, and the transmission is not facilitated.
Disclosure of Invention
The invention aims to solve the problems that: the visible light voice image hybrid transmission system and method based on the light intensity not only reduce the transmission rate, but also enable the receiving end to recover more simply.
The technical scheme provided by the invention for solving the problems is as follows: a visible light voice image hybrid transmission system based on light intensity comprises a camera, a voice decoding chip, an FPGA development board, two paths of LED driving circuits with the same wavelength, a photoelectric detection module, an AD acquisition module and an upper computer; the method comprises the steps that a sending end is composed of two parts, wherein one part is used for collecting image data in a JPEG format, the other part is used for collecting voice data, the two data are respectively sent through two LED driving circuits, two LED lights are simultaneously projected onto a single photoelectric detector through setting relative positions, an AD (analog-to-digital) collecting module is used for transmitting the data to the interior of an FPGA (field programmable gate array) development board, and the corresponding voice data and the corresponding image data are separated through judging and processing the two light intensities; respectively transmitting to the corresponding terminals.
A visible light voice image hybrid transmission method based on light intensity comprises the following steps,
(1) The FPGA is used for driving a camera to acquire image data in a JPEG format, then a voice decoding chip is driven to acquire voice data, two paths of data are respectively loaded to two paths of LED driving circuits with the same wavelength, and light emitted by two LEDs is projected onto a photoelectric detector at the same time through position adjustment;
(2) The voltage signal after photoelectric conversion is in four states of high, medium, low and low; the high state is the superposition of two paths of data at a high level, the medium and low states are the superposition of one path of data at a low level and the other path of data at a high level, and the low state is the superposition of two paths at the same low level;
(3) The image data and the voice data can be separated according to the setting of the threshold value in the four states, and for the condition that the middle-high state is high level, the value between the middle-high state and the middle-low state is directly selected as the threshold value to be judged, and the threshold value is set as b; for the image data, when the voltage signal is greater than b, the image data is 1, and when the voltage signal is less than b, the image data is 0. For voice data, two other thresholds are needed, namely a threshold a selected between a high state and a medium high state and a threshold c selected between a medium low state and a low state; when the value is larger than a or larger than c and smaller than b, the voice data is 1; when c is less than c or b is more than c and less than a, the voice data is 0; and for the voice data, when the voltage signal is greater than B, the voice data is 1, and when the voltage signal is less than B, the voice data is 0. For image data, two other thresholds are also needed, namely a threshold A selected between a high state and a middle high state and a threshold C selected between a middle low state and a low state; when the value is greater than A or greater than C and less than B, the image data is 1; when less than C or more than B and less than A, the image data is 0;
(4) The recovered image data is output to an upper computer; the voice data is connected with a loudspeaker through an FPGA port, and the real-time transmission of voice and images is completed.
Compared with the prior art, the invention has the advantages that: the invention can transmit voice and image data at a relatively low transmission rate, and the demodulation is simpler for a single receiving end. Not only saves hardware resources, but also is stable and efficient.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a system block diagram of the present invention;
fig. 2 a photoelectric conversion 1;
fig. 3 photoelectric conversion 2;
FIG. 4 threshold discrimination 1;
FIG. 5 threshold discrimination 2;
fig. 6 terminal.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings and examples, so that how to implement the embodiments of the present invention by using technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.
A visible light voice image hybrid transmission system based on light intensity comprises a camera, a voice decoding chip, an FPGA development board, two paths of LED driving circuits with the same wavelength, a photoelectric detection module, an AD acquisition module and an upper computer; the method comprises the steps that a sending end is composed of two parts, wherein one part is used for collecting image data in a JPEG format, the other part is used for collecting voice data, the two data are respectively sent through two LED driving circuits, two LED lights are simultaneously projected onto a single photoelectric detector through setting relative positions, an AD (analog-to-digital) collecting module is used for transmitting the data to the interior of an FPGA (field programmable gate array) development board, and the corresponding voice data and the corresponding image data are separated through judging and processing the two light intensities; respectively transmitting to the corresponding terminals.
A visible light voice image hybrid transmission method based on light intensity comprises the following steps,
(1) The FPGA is used for driving a camera to acquire image data in a JPEG format, then a voice decoding chip is driven to acquire voice data, two paths of data are respectively loaded to two paths of LED driving circuits with the same wavelength, and light emitted by two LEDs is projected onto a photoelectric detector at the same time through position adjustment;
(2) The voltage signal after photoelectric conversion is in four states of high, medium, low and low; the high state is the superposition of two paths of data at high level, the medium and high and low states are the superposition of one path of data at low level and one path of data at high level, and the low state is the superposition of two paths of data at low level;
(3) The image data and the voice data can be separated according to the setting of the threshold value in the four states, and for the condition that the middle-high state is high level, the value between the middle-high state and the middle-low state is directly selected as the threshold value to be judged, and the threshold value is set as b; for the image data, when the voltage signal is greater than b, the image data is 1, and when the voltage signal is less than b, the image data is 0. For voice data, two other thresholds are needed, namely a threshold a selected between a high state and a medium high state and a threshold c selected between a medium low state and a low state; when the value is larger than a or larger than c and smaller than b, the voice data is 1; when the value is less than c or more than b and less than a, the voice data is 0; and for the voice data, when the voltage signal is greater than B, the voice data is 1, and when the voltage signal is less than B, the voice data is 0. For image data, two other thresholds are also needed, namely a threshold A selected between a high state and a medium high state and a threshold C selected between a medium low state and a low state; when the value is greater than A or greater than C and less than B, the image data is 1; when less than C or more than B and less than A, the image data is 0;
(4) The recovered image data is output to an upper computer; the voice data is connected with the loudspeaker through the FPGA port, and the real-time transmission of voice and images is completed.
The specific working process of the invention is as follows: according to the system shown in fig. 1, image data and voice data are respectively acquired by using the FPGA, the two paths of data are respectively loaded to the corresponding LED driving circuits, and the photoelectric detector module converts the acquired optical signals into voltage signals and amplifies the voltage signals. The two cases are collected as shown in fig. 2 and fig. 3, and the state after the two data are fused can be obviously seen. And performing threshold discrimination and recovery on the two states. As shown in fig. 4 and 5, the image data in the first case may be determined by b. When the voice data is greater than a, greater than c and less than b, the voice data is 1, and when the voice data is less than c, greater than b and less than a, the voice data is 0, and then the voice data can be restored to the original data. In the second case, the voice data is judged by B, and the image data is 1 when it is larger than a or larger than C and smaller than B, and is 0 when it is smaller than C or larger than B and smaller than a. And sending the recovered image data to an upper computer through a USB module, so that a real-time image can be displayed. The voice data is sent back to the WM8731 inside the FPGA, and the real-time sound can be heard through the loudspeaker.
The foregoing is illustrative of the preferred embodiments of the present invention only and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the scope of the invention as defined by the independent claims are intended to be embraced therein.
Claims (2)
1. A visible light voice image hybrid transmission method based on light intensity is characterized in that: the method comprises the following steps of,
(1) The FPGA is used for driving a camera to acquire image data in a JPEG format, then a voice decoding chip is driven to acquire voice data, two paths of data are respectively loaded to two paths of LED driving circuits with the same wavelength, and light emitted by two LEDs with the same wavelength is simultaneously projected onto a photoelectric detector through position adjustment;
(2) The voltage signal after photoelectric conversion is in four states of high, medium, low and low; the high state is the superposition of two paths of data at high level, the medium and high and low states are the superposition of one path of data at low level and one path of data at high level, and the low state is the superposition of two paths of data at low level;
(3) The image data and the voice data can be separated according to the setting of the threshold value in the four states, and for the condition that the middle-high state is high level, the value between the middle-high state and the middle-low state is directly selected as the threshold value to be distinguished, and the threshold value is set as b; for the image data, when the voltage signal is greater than b, the image data is 1, and when the voltage signal is less than b, the image data is 0; for voice data, two other thresholds are needed, namely a threshold selected between a high state and a middle high state, and a threshold selected between a middle low state and a low state, c; when the value is larger than a or larger than c and smaller than b, the voice data is 1; when c is less than c or b is more than c and less than a, the voice data is 0; for the condition that the middle-high state is low level, directly selecting a value between the middle-high state and the middle-low state as a threshold value to judge, and setting the threshold value as B, for the voice data, when the voltage signal is greater than B, the voice data is 1, and when the voltage signal is less than B, the voice data is 0; for image data, two other thresholds are also needed, namely a threshold A selected between a high state and a medium high state and a threshold C selected between a medium low state and a low state; when the value is greater than A or greater than C and less than B, the image data is 1; when less than C or more than B is less than a, the image data is 0;
(4) The recovered image data is output to an upper computer; the voice data is connected with the loudspeaker through the FPGA port, and the real-time transmission of voice and images is completed.
2. A system employing the method of claim 1, wherein: the system comprises a camera, a voice decoding chip, an FPGA development board, two paths of LED driving circuits with the same wavelength, a photoelectric detection module, an AD acquisition module and an upper computer; the method comprises the steps that a sending end is composed of two parts, wherein one part is used for collecting image data in a JPEG format, the other part is used for collecting voice data, the two kinds of data are respectively sent through two LED driving circuits with the same wavelength, two LED lights are simultaneously projected onto a single photoelectric detector through setting relative positions, an AD collection module is used for transmitting the data to the interior of an FPGA development board, and the corresponding voice data and the corresponding image data are separated through judging and processing the two light intensities; respectively transmitting to the corresponding terminals.
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| CN103947137A (en) * | 2011-11-21 | 2014-07-23 | 松下电器产业株式会社 | Lighting apparatus for visible light communication, and visible light communication system using said apparatus |
| CN105959062A (en) * | 2016-06-30 | 2016-09-21 | 西安电子科技大学 | Dual-rate visible light communication transmitter based on LED vehicle lamps |
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| CN101051867A (en) * | 2006-04-06 | 2007-10-10 | 李汉军 | Full spectrum laser carrier light transmission method and use |
| CN101502013A (en) * | 2006-10-23 | 2009-08-05 | 松下电器产业株式会社 | Optical space transmission system using visible light and infrared light |
| CN102104431A (en) * | 2011-01-19 | 2011-06-22 | 成都优博创技术有限公司 | Dual-rate receiving device in optical transceiver |
| CN103947137A (en) * | 2011-11-21 | 2014-07-23 | 松下电器产业株式会社 | Lighting apparatus for visible light communication, and visible light communication system using said apparatus |
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