# Patent

## Title
Monitor device adapter

## Abstract

A monitor device adapter includes first and second conversion circuits, a switch unit, and a monitor interface. The first conversion circuit includes a digital to analog (D/A) converter and a coupler. The second conversion circuit includes an analog to digital (A/D) converter and a decoupler. When the switch unit connects the first conversion circuit to the monitor interface, the D/A converter converts a digital signals representing data into a first analog form data for coupling with a first alternating current (AC) voltage. When the switch unit connects the second conversion circuit to the monitor interface, the decoupler decouples and separates a second analog form data into the second analog form data. The A/D converter converts the second analog form data into digital signals representing data, and outputs the digital signals representing data to the monitor interface.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
Relevant present application is disclosed in the co-pending U.S. patent application Ser. Nos. 13/442,937, 13/442,945, 13/442,953, 13/442,956, 13/442,959, 13/442,965, 13/442,977, 13/442,981, 13/442,988, 13/442,873) having the same title and assigned to the same assignee as named herein.
1. Technical Field
The present disclosure relates to adapters, and particularly, to a monitoring device adapter.
2. Description of Related Art
In a monitoring system, main monitors are connected to cameras through many long cables to communicate with the cameras. Therefore, when another camera needs to be connected to the main monitors, another long cable is needed to be connected between the other camera and the main monitors. This is most inconvenient.



BRIEF DESCRIPTION OF THE DRAWINGS
Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawing are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, all the views are schematic, and like reference numerals designate corresponding parts throughout the several views.
FIG. 1 is a schematic view of an exemplary embodiment of a monitor device adapter, wherein the monitor device adapter includes a voltage conversion circuit.
FIG. 2 is a block diagram of the monitor device adapter of FIG. 1.
FIG. 3 is a block diagram of the voltage conversion circuit of FIG. 1.
FIG. 4 is a schematic view of the monitor device adapter communicating with another monitor device adapter.
FIG. 5 is a block diagram of the systems of FIG. 4.



DETAILED DESCRIPTION
The disclosure, including the accompanying drawings in which like references indicate similar elements, is illustrated by way of example and not by way of limitation. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean at least one.
Referring to FIGS. 1 to 4, an embodiment of a monitor device adapter 100 includes an enclosure 10, an alternating current (AC) power plug 20, a monitor interface 30, a first conversion circuit 40, a second conversion circuit 50, a switch unit 60, and a voltage conversion circuit 200. The AC power plug 20 is mounted on the enclosure 10 to be connected to an AC power socket 70. The monitor interface 30 is mounted on the enclosure 10 to be connected to a main monitor 82 or a camera 80. The switch unit 60 is connected between the monitor interface 30 and each of the first and second conversion circuits 40 and 50, to connect either the first conversion circuit 40 or the second conversion circuit 50 to the monitor interface 30. When the camera 80 connected to the monitor device adapter 100 functions as a signal transmission terminal, the switch unit 60 connects the first conversion circuit 40 to the monitor interface 30. When the main monitor 82 connected to the monitor device adapter 100 functions as a signal receiving terminal, the switch unit 60 connects the second conversion circuit 50 to the monitor interface 30. In the embodiment, the switch unit 60 is a manual switch.
The first conversion circuit 40 includes a compression control chip 41, a digital to analog (D/A) converter 42, a coupler 43, and a first AC filter 44. The second conversion circuit 50 includes a decompression control chip 51, an analog to digital (A/D) converter 52, a decoupler 53, and a second AC filter 54.
The compression control chip 41 is connected to the switch unit 60. The D/A converter 42 is connected between the compression control chip 41 and the coupler 43. The coupler 43 is connected to the AC power plug 20 through the first AC filter 44. The AC power plug 20 is also connected to the decoupler 53 through the second AC filter 54. The A/D converter 52 is connected between the decoupler 53 and the decompression control chip 51. The decompression control chip 51 is connected to the switch unit 60.
The voltage conversion circuit 200 includes a third AC filter 210, an alternating current to direct current (AC/DC) converter 220, a voltage adjustor 230, and a DC filter 240. In view of the likelihood of random noise in the commercial AC voltage, the third AC filter 210 is connected to the AC power plug 20 to receive the AC voltage, and filters noise from the AC voltage. The AC/DC converter 220 is connected between the third AC power filter 210 and the voltage adjustor 230, to convert the AC voltage into a DC voltage, and outputs the DC voltage to the voltage adjustor 230. The voltage adjustor 230 adjusts the received DC voltage. In view of the possibility of random noise in the adjusted DC voltage, the DC filter 240 is connected between the voltage adjustor 230 and the monitor interface 30 to filter the noise from the adjusted DC voltage and output the filtered DC voltage to the monitor interface 30, to power the camera 80 or the main monitor 82 connected to the monitor interface 30.
Referring to FIGS. 4 and 5, an example describes a working principle of the monitor device adapter 100. A first monitor device adapter 101 is inserted into a first AC power socket 71 in a first room 300. A second monitor device adapter 102 is inserted into a second AC power socket 72 in a second room 400. The first AC power socket 71 is connected to the second AC power socket 72 through a commercial AC power line 90. The first and second monitor device adapters 101 and 102 have the same function and structure as the above-mentioned monitor device adapter 100. The camera 80 is connected to the monitor interface 30 of the first monitor device adapter 101 in the first room 300. The main monitor 82 is connected to the monitor interface 30 of the second monitor device adapter 102 in the second room 400.
When the camera 80 in the first room 300 functioning as a signal transmission terminal communicates with the main monitor 82 in the second room 400 functioning as a signal receiving terminal, the switch unit 60 of the first monitor device adapter 101 is switched to connect the first conversion circuit 40 to the monitor interface 30 of the first monitor device adapter 101, and the switch unit 60 of the second monitor device adapter 102 is switched to connect the second conversion circuit 50 to the monitor interface 30 of the second monitor device adapter 102.
The camera 80 outputs a digital signal representing data to the monitor interface 30 of the first monitor device adapter 101. The compression control chip 41 receives the digital signal representing data through the switch unit 60, compresses the digital signal representing data into one or more data packets, and outputs the one or more data packets to the D/A converter 42. The D/A converter 42 converts the one or more data packets into an analog form (analog form data) suitable for transmission over an AC voltage which functions as a carrier wave, and outputs the analog form data to the coupler 43. The coupler 43 couples the analog form data to an AC voltage and outputs the AC voltage coupled with the analog form data to the first AC power socket 71. The first AC filter 44 filters any noise from the AC voltage coupled with the analog form data, and outputs the AC voltage coupled with the analog form data to the AC power line 90 through the AC power plug 20 and the AC power socket 71.
The AC power line 90 transmits the AC voltage coupled with the analog form data to the second AC filter 54 through the AC power socket 72 and the second power plug 20 in the second room 400. The second filter 54 filters any noise from the AC voltage coupled with the analog form data, and outputs the filtered AC voltage coupled with the analog form data to the decoupler 53. The decoupler 53 decouples and separates the AC voltage coupled with the analog form data into the AC voltage and the analog form data, and outputs the analog form data to the A/D converter 52. The A/D converter 52 converts the analog form data into the one or more data packets, and outputs the one or more data packets to the decompression control chip 51 of the second monitor device adapter 102. The decompression control chip 51 decompresses the data packet into the digital signals representing data, and outputs the digital signals representing data to the main monitor 82 through the switch unit 60 and the monitor interface 30 in the second room 400. Therefore, the first monitor device 101 in the first room 300 can communicate directly with the second monitor device 102 in the second room 400 through the commercial AC power line 90.
Although numerous characteristics and advantages of the embodiments have been set forth in the foregoing description, together with details of the structure and function of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in the matters of shape, size, and arrangement of parts within the principles of the embodiments to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.

## Claims

1. A monitor device adapter, comprising:
an alternating current (AC) power plug to be inserted into an AC power socket to receive a first AC voltage;
a monitor interface to be connected to a main monitor or a camera;
a first conversion circuit comprising a digital to analog (D/A) converter, and a coupler connected between the D/A converter and the AC power plug;
a second conversion circuit comprising an analog to digital (A/D) converter, and a decoupler connected between the A/D converter and the AC power plug; and
a switch unit connected between the monitor interface and each of the first conversion circuit and the second conversion circuit, to connect either the first conversion circuit or the second conversion circuit to the monitor interface;
wherein when the switch unit connects the first conversion circuit to the monitor interface, the D/A converter receives a first digital signal representing data output by the camera through the monitor interface, and converts the first digital signal representing data into a first analog form data, the coupler couples the first analog form data to the first AC voltage, and outputs the first AC voltage coupled with the first analog form data to the AC power plug, the AC power plug transmits the first AC voltage coupled with the first analog form data to an AC power line connected to the AC power socket; and
wherein when the switch unit connects the second conversion circuit to the monitor interface, the decoupler receives a second AC voltage coupled with a second analog form data through the AC power plug from the AC power line connected to the AC power socket, decouples and separates the second AC voltage coupled with the second analog form data into the second AC voltage and the second analog form data, and outputs the second analog form data to the A/D converter, the A/D converter converts the second analog form data into a second digital signal representing data, and outputs the second digital signal representing data to the main monitor through the monitor interface.

2. The monitor device adapter of claim 1, wherein the first conversion circuit further comprises a compression control chip, the compression control chip is connected between the switch unit and the D/A converter to receive the first digital signal representing data from the camera through the monitor interface, compresses the first digital signal representing data into a first data packet, and outputs the first data packet to the D/A converter, the D/A converter converts the first data packet into the first analog form data; wherein the second conversion circuit further comprises a decompression control chip, the decompression control chip is connected between the switch unit and the A/D converter to receive a second data packet from the AC power line and decompress the second data packet into the second digital signal representing data, and outputs the second digital signal representing data to the monitor interface through the switch unit.

3. The monitor device adapter of claim 1, wherein the first conversion circuit further comprises an AC filter, the AC filter is connected between the coupler and the AC power plug to filter noise from the first AC voltage coupled with the first analog form data output to the AC power line.

4. The monitor device adapter of claim 1, wherein the second conversion circuit further comprises an AC filter, the AC filter is connected between the decoupler and the AC power plug to filter noise from the second AC voltage coupled with the second analog form data from the AC power line.

5. The monitor device adapter of claim 4, further comprising a voltage conversion circuit, wherein the voltage conversion circuit comprises an alternating current to direct current (AC/DC) converter and a voltage adjustor, the AC/DC converter is connected between the AC power plug and the voltage adjustor to receive the first AC voltage, converts the first AC voltage into a DC voltage, and outputs the DC voltage to the voltage adjustor, the voltage adjustor adjusts the received DC voltage, and outputs the adjusted DC voltage to the monitor interface to power the camera or the main monitor.