CN113938736A - Set top box for outputting audio and video through USB, converter for switching audio and video and method for realizing output of analog audio and video - Google Patents
Set top box for outputting audio and video through USB, converter for switching audio and video and method for realizing output of analog audio and video Download PDFInfo
- Publication number
- CN113938736A CN113938736A CN202111204654.2A CN202111204654A CN113938736A CN 113938736 A CN113938736 A CN 113938736A CN 202111204654 A CN202111204654 A CN 202111204654A CN 113938736 A CN113938736 A CN 113938736A
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- usb
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 239000002699 waste material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
- H04N21/43635—HDMI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a set top box for outputting audio and video through a USB (universal serial bus), which comprises a USB3.0 interface, wherein 4 signal lines in 9 signal lines of the USB3.0 interface are connected according to the definition of a USB2.0 interface, 3 signal lines in the remaining 5 signal lines are connected to analog audio and video output signals of the set top box, the other 1 signal line is connected to the ground, and finally the last 1 signal line is connected to a main chip through a conversion circuit; the invention also discloses a converter for switching audio and video through USB and a method for outputting analog audio and video through USB; the invention reduces the cost of the set-top box and can also output analog audio and video signals through the converter.
Description
Technical Field
The invention relates to the technical field of televisions, in particular to a set top box for outputting audio and video through a USB (universal serial bus), an audio and video switching converter and a method for outputting analog audio and video.
Background
The video output interface of the set-top box on the market at present generally comprises an HDMI (high definition multimedia interface) and an analog audio/video interface. The analog audio/video interface mainly considers that the old television of part of users can not support the high-definition multimedia interface. But at present, the national economy continues to be good, and the living standard of people is continuously improved. The number of televisions on the market which only support analog audio and video interfaces is very small, and the analog audio and video interfaces and the driving circuits thereof in the set-top box cannot be used under most conditions. The product cost is increased, the resource waste is also caused, on the other hand, the analog audio and video interface has certain requirements, and equipment manufacturers support the part of users.
Disclosure of Invention
In order to solve the problem of resource waste of the existing set top box interface scheme and simultaneously retain the support of an analog television user, the invention aims to provide a set top box for outputting audio and video through a USB, a converter for switching the audio and video and a method for realizing the output of analog audio and video.
In order to achieve the purpose, the invention adopts the technical scheme that: a set top box for outputting audio and video through a USB comprises a USB3.0 interface, wherein 4 signal lines in 9 signal lines of the USB3.0 interface are connected according to the definition of a USB2.0 interface, 3 signal lines in the remaining 5 signal lines are connected to analog audio and video output signals of the set top box, the other 1 signal line is connected to the ground, and finally the 1 signal line is connected to a main chip through a conversion circuit.
The invention also provides a converter for switching audio and video through the USB, which comprises a USB3.0 plug, wherein the USB3.0 plug is connected with a USB3.0 interface of the set-top box, two signal lines of 9 signal lines of the USB3.0 plug are externally connected with the USB interface or suspended, 3 signal lines of the remaining 7 signal lines are connected according to VBUS, GND and GND _ DRAIN defined by the USB3.0 standard, the other 3 signal lines are connected with an audio and video socket, and finally 1 signal line obtains a high level through a divider resistor and is used for controlling analog audio and video signal output by a main chip.
As a further improvement of the invention, the audio/video socket further comprises connecting 3 signal lines connected with the audio/video socket with a line sequence change-over switch for meeting different audio/video line sequence requirements.
The invention also provides a method for outputting the analog audio and video through the USB, which comprises the following steps:
when the set-top box does not detect the access of the converter, or the access of a standard USB2.0 or standard USB 3.0U disk, the analog audio and video signals in the set-top box do not output signals, and the USB interface is regarded as a standard USB2.0 interface; when the converter is connected to the set-top box, the main chip main control program detects a high-level signal increased by the converter, the analog audio and video signal outputs a signal to the outside, and a user can watch live television through an audio and video interface connected with the converter and a television analog signal interface.
In the invention, the set-top box part provides the analog audio and video output capability by adjusting the traditional USB2.0 interface circuit on the premise of keeping the USB interface function. The expansion module part processes the analog audio/video output signal and then switches the processed signal to a traditional 3.5mm analog audio/video interface, so that a user can conveniently access an analog audio/video signal cable. The use requirements of analog television users are met.
The invention has the beneficial effects that:
1. the technical scheme provided by the invention can meet the requirement that most users watch high-definition videos and take care of part of analog television users, and for set top box manufacturers, only a small amount of USB audio-video conversion interface converters are needed when supplying goods to regions, so that part of analog television users can be taken care of, the cost of the set top box is reduced, and the resource waste is also reduced.
2. The invention can reduce the area of the PCB required by the set-top box by cutting the analog audio-video interface and the driving circuit thereof, and can further reduce the cost of the set-top box.
3. According to the invention, the converter can meet the requirements of analog audio and video line sequences of different markets by toggling the switch or the electronic switch, the same converter can be used in a plurality of different set top box markets, mass production can be realized, and the cost of the converter is effectively reduced. .
Drawings
Fig. 1 is a schematic structural diagram of a set top box outputting audio and video through a USB in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a converter for switching audio and video via USB in the embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
According to the embodiment, the set top box body can reduce the traditional analog audio and video signal interfaces and related circuits thereof, reduce the occupied space of a printed circuit board, provide the analog audio and video signal output capability through a converter for transferring the audio and video interface through the USB and reserve the USB communication capability.
As shown in fig. 1, this embodiment provides a set-top box outputting audio and video via USB, where the set-top box is partially consistent with a conventional set-top box in other parts, only a conventional USB2.0 interface is changed to a USB3.0 interface on the USB interface, an original USB2.0 signal line is unchanged, and 5 signal lines that are added out of a USB3.0 socket are changed to include 3 signal lines connected to an analog audio and video output signal of the set-top box, 1 signal line is connected to ground, and finally 1 signal line is connected to a main chip via a conversion circuit.
As shown in fig. 2, this embodiment further provides a converter for transferring audio and video via USB, where the converter is connected to the set-top box via a USB3.0 plug, and among 9 signal lines connected to the USB3.0 plug in the converter, 2 signal lines of the conventional USB2.0 may not be connected, and may also be connected to an external USB port. The other 7 signal lines are kept unchanged from VBUS, GND and GND _ DRAIN defined by the original USB3.0 standard. 3 of the remaining 4 signal lines are connected with the audio and video socket. Meanwhile, as an improvement, the signal line can be selectively connected with a certain line sequence change-over switch so as to meet the requirements of different audio and video line sequences. And finally, obtaining a high level by 1 signal wire through a voltage dividing resistor, and using the high level for the master chip to control the output of the analog audio and video signals.
The embodiment further provides a method for outputting analog audio and video through USB, when the set-top box does not detect the access of the converter, or the access of a standard USB2.0 or USB3.0 USB disk, the analog audio and video signal in the set-top box does not output an external signal, and the USB interface is regarded as a standard USB2.0 interface; when the converter is connected to the set-top box, the main chip main control program detects a high level signal increased by the converter, the analog audio and video signal outputs a signal to the outside, and a user can watch live television by connecting an audio and video interface of the USB audio and video conversion interface converter and a television analog signal interface.
The HDMI-to-analog audio/video signal converter in the market also has similar functions, but the difference is that the HDMI-to-analog audio/video signal converter in the market needs an HDMI signal processing chip arranged in the converter, needs an external power supply and needs a matched power adapter, and the converter in the embodiment only needs an analog audio processing chip and a plurality of filter circuits, the power supply is provided by a USB interface, and the cost is far lower than that of the existing HDMI-to-analog audio/video signal converter in the market; on the other hand, the converter of the embodiment can select to reserve the function of the USB interface, and does not affect the function of the original set-top box.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (4)
1. A set top box for outputting audio and video through a USB is characterized by comprising a USB3.0 interface, wherein 4 signal lines in 9 signal lines of the USB3.0 interface are connected according to the definition of a USB2.0 interface, 3 signal lines in the remaining 5 signal lines are connected to analog audio and video output signals of the set top box, the other 1 signal line is connected to the ground, and finally the 1 signal line is connected to a main chip through a conversion circuit.
2. A converter for switching audio and video through a USB (universal serial bus) is characterized by comprising a USB3.0 plug, wherein the USB3.0 plug is connected with a USB3.0 interface of a set-top box according to claim 1, two signal lines in 9 signal lines of the USB3.0 plug are externally connected with the USB interface or suspended, 3 signal lines in the remaining 7 signal lines are connected according to VBUS (voltage-variable bus), GND (ground) and GND _ DRAIN (ground) defined by the USB3.0 standard, the other 3 signal lines are connected with an audio and video socket, and finally 1 signal line obtains a high level through a divider resistor and is used for a main chip to control the output of analog audio and video signals.
3. A converter for transferring audio/video via USB as claimed in claim 2 further comprising 3 signal lines connected to the audio/video socket and connected to the line sequence switch for meeting different audio/video line sequence requirements.
4. A method for outputting analog audio and video through USB is characterized by comprising the following steps:
when the set-top box of claim 1 does not detect the switch-in of claim 2 or 3, or the standard USB2.0 or standard USB 3.0U disk switch-in, the analog audio and video signal in the set-top box does not output the signal externally, and the USB interface is regarded as the standard USB2.0 interface; when the converter of claim 2 or 3 is connected to the set-top box of claim 1, the main chip main control program detects the high level signal increased by the converter, the analog audio and video signal outputs the signal to the outside, and the user can watch live television by connecting the audio and video interface of the converter and the analog signal interface of the television.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111204654.2A CN113938736A (en) | 2021-10-15 | 2021-10-15 | Set top box for outputting audio and video through USB, converter for switching audio and video and method for realizing output of analog audio and video |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111204654.2A CN113938736A (en) | 2021-10-15 | 2021-10-15 | Set top box for outputting audio and video through USB, converter for switching audio and video and method for realizing output of analog audio and video |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113938736A true CN113938736A (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111204654.2A Pending CN113938736A (en) | 2021-10-15 | 2021-10-15 | Set top box for outputting audio and video through USB, converter for switching audio and video and method for realizing output of analog audio and video |
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| Country | Link |
|---|---|
| CN (1) | CN113938736A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110087806A1 (en) * | 2009-09-25 | 2011-04-14 | Soumendra Mohanty | Dual-Mode Data Transfer of Uncompressed Multimedia Contents or Data Communications |
| CN203482310U (en) * | 2013-09-09 | 2014-03-12 | Tcl光电科技(惠州)有限公司 | Display device and high frequency conversion circuit |
| CN203590328U (en) * | 2013-11-08 | 2014-05-07 | 康佳集团股份有限公司 | Signal acquisition device |
| US20160147704A1 (en) * | 2012-09-21 | 2016-05-26 | Nxp B.V. | Displayport over USB Mechanical Interface |
| CN207560194U (en) * | 2017-12-28 | 2018-06-29 | 深圳Tcl新技术有限公司 | USB is multiplexed connector and television set |
-
2021
- 2021-10-15 CN CN202111204654.2A patent/CN113938736A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110087806A1 (en) * | 2009-09-25 | 2011-04-14 | Soumendra Mohanty | Dual-Mode Data Transfer of Uncompressed Multimedia Contents or Data Communications |
| US20160147704A1 (en) * | 2012-09-21 | 2016-05-26 | Nxp B.V. | Displayport over USB Mechanical Interface |
| CN203482310U (en) * | 2013-09-09 | 2014-03-12 | Tcl光电科技(惠州)有限公司 | Display device and high frequency conversion circuit |
| CN203590328U (en) * | 2013-11-08 | 2014-05-07 | 康佳集团股份有限公司 | Signal acquisition device |
| CN207560194U (en) * | 2017-12-28 | 2018-06-29 | 深圳Tcl新技术有限公司 | USB is multiplexed connector and television set |
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Application publication date: 20220114 |