CN210839827U

CN210839827U - Hard disk video recorder

Info

Publication number: CN210839827U
Application number: CN201920898287.2U
Authority: CN
Inventors: 黄赐昌
Original assignee: Zhejiang Dahua Technology Co Ltd
Current assignee: Zhejiang Dahua Technology Co Ltd
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2020-06-23
Anticipated expiration: 2029-06-14

Abstract

The utility model provides a hard disk video recorder, wherein, the hard disk video recorder comprises a central processing unit CPU, wherein, the CPU is in communication connection with an audio/video analog-to-digital conversion AD and an Ethernet port physical layer PHY, the CPU is used for determining the type of a camera currently connected with a first interface according to the state of the AD and the PHY; the AD, wherein an input port of the AD is connected with the first interface; the PHY, wherein an input port of the PHY is connected to the first interface; the first interface, wherein the first interface is configured to connect with the camera for receiving a video stream of the camera. Through the utility model discloses, the hard disk video recorder who exists among the correlation technique can't realize the problem of DVR and NVR function simultaneously.

Description

Hard disk video recorder

Technical Field

The utility model relates to the field of communication, particularly, relate to a digital video recorder.

Background

Hard disk recorders are classified into Digital Video Recorders (DVRs) and Network Video Recorders (NVRs). In the prior art, a digital hard Disk Video (DVR) transmits a video signal by using a coaxial cable, and the Power supply mode is a Power Over Coax (POC) Power supply mode or a Power Over Coax (POC) Power supply mode; the Network Video Recorder (NVR) adopts a twisted pair (network cable) to transmit video signals, and the Power supply mode is Power Over Ethernet (POE) Power supply or independent Power Over Ethernet (POE) Power supply at the front end and the rear end.

The external camera accessible by the DVR is an analog camera, and the external camera accessible by the NVR is a webcam (or IP camera). Therefore, the types of external cameras that can be accessed by the hard disk recorder which cannot realize the functions of the DVR and the NVR at the same time are limited.

Aiming at the problem that the hard disk video recorder in the related technology simultaneously realizes the functions of DVR and NVR, no effective solution is provided at present.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a digital video recorder to solve the problem that the digital video recorder that exists can't realize DVR and NVR function simultaneously among the correlation technique at least.

According to the utility model discloses an embodiment provides a hard disk video recorder, include: the CPU is in communication connection with an audio/video analog-to-digital conversion (AD) and an Ethernet port physical layer (PHY), and is used for determining the type of a camera currently accessed to a first interface according to the states of the AD and the PHY; the AD, wherein an input port of the AD is connected with the first interface; the PHY, wherein an input port of the PHY is connected to the first interface; the first interface, wherein the first interface is configured to connect with the camera for receiving a video stream of the camera.

Optionally, the first interface comprises a first network port, wherein the first network port comprises a first pin configured to receive a video stream of the camera.

Optionally, the first network port further comprises a second pin, wherein the second pin is configured to receive a power signal for powering the camera.

Optionally, the CPU includes: the first logic operation module is used for reading the AD state value after the AD is connected with the first interface and the PHY is disconnected with the first interface; determining the type of the camera as an analog camera when the state value of the AD is determined to be a first predetermined value.

Optionally, the CPU includes: the second logic operation module is used for reading the state value of the PHY after the AD is disconnected with the first interface and the PHY is connected with the first interface; and when the state value of the PHY is determined to be a second preset value, determining that the type of the camera is a network video recorder.

Optionally, the hard disk video recorder further includes: the first switch is connected with the AD and the first interface and used for controlling the connection and disconnection of the AD and the first interface; and the second switch is connected with the PHY and the first interface and is used for controlling the connection and disconnection of the PHY and the first interface.

Optionally, the hard disk video recorder further includes: a video signal level conversion module, wherein the input port of the AD is connected to the first interface through the video signal level conversion module; an isolation transformer, wherein the input port of the PHY is connected to the first interface through the isolation transformer.

Optionally, the video signal level conversion module comprises a balun.

Optionally, the hard disk video recorder further includes: a power module, wherein the power module is connected to the first interface, and the power module is configured to supply power to the camera through the first interface.

Optionally, the hard disk video recorder further includes: the camera comprises a second interface, the second interface is connected with the first interface through a network cable, the first interface comprises a first network port, and the second interface comprises a second network port.

Through the utility model discloses, because including AD and PHY simultaneously in the digital video recorder to can realize confirming the type of the camera of connecting according to the state of AD and PHY, consequently, can solve the problem that the digital video recorder that exists can't realize DVR and NVR function simultaneously among the correlation technique, and then reach compatible DVR and NVR technique, and can support analog camera, can support the effect of network camera again.

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 application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a block diagram of a hard disk recorder according to an embodiment of the present invention;

fig. 2 is a schematic view of a first portal according to an embodiment of the present invention;

fig. 3 is a block diagram of a power supply module according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a video signal level conversion module according to an embodiment of the present invention;

fig. 5 is a schematic block diagram of an adaptive hard disk video recorder according to an embodiment of the present invention;

fig. 6 is an adaptation process of an analog video recorder and a network video recorder according to an embodiment of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

In this embodiment, a hard disk video recorder is provided, and fig. 1 is a structural block diagram according to the utility model discloses a hard disk video recorder, as shown in fig. 1, this hard disk video recorder includes:

a Central Processing Unit (CPU) 12, wherein the CPU 12 is communicatively connected to an audio/video analog-to-digital converter (AD 14) and an ethernet port physical layer (PHY) 16, and the CPU 12 is configured to determine a type of a camera currently connected to a first interface 18 according to states of the AD 14 and the PHY 16;

the AD 14, wherein an input port of the AD 14 is connected with the first interface;

the PHY 16, wherein an input port of the PHY 16 is coupled to the first interface;

the first interface 18, wherein the first interface 18 is configured to be connected to the camera for receiving a video stream of the camera.

The CPU is used for coding, decoding and storing audio and video data; the above-mentioned AD (i.e., audio-video AD) is used to convert an analog audio-video signal into a digital audio-video signal; the PHY (which may also be referred to as an ethernet PHY) is used to encode and convert digital signals into serial analog signals for transmission over twisted pair cables. Optionally, the CPU is connected to an output port of the AD and an output port of the PHY.

Through the embodiment, the AD and the PHY are simultaneously included in the hard disk video recorder, and the type of the connected video camera can be determined according to the states of the AD and the PHY, so that the problem that the DVR and the NVR cannot be simultaneously realized in the hard disk video recorder in the related technology can be solved, the compatible DVR and NVR technology is further achieved, and the effects of supporting both the analog video camera and the network video camera can be realized.

In the prior art, a common digital video recorder adopts a coaxial cable to transmit video signals, and simultaneously adopts an independent adapter to supply power to the front end, so that the whole scheme has high cost and complicated engineering. In view of this problem, in this embodiment, a scheme for transmitting a video signal by using a twisted pair line instead of a coaxial line is provided, and in this embodiment, the first interface includes a first network interface, where the first network interface includes a first pin, and the first pin is configured to receive a video stream of the camera. The interaction between the network ports is realized through twisted-pair cables (or called network cables), so that the digital video recorder can realize the purpose of transmitting video signals through the twisted-pair cables. The twisted pair is adopted to replace a coaxial line to transmit video signals, so that the scheme cost can be reduced to a certain extent, and the construction engineering is simplified. In this embodiment, as for the first schematic diagram of the network port, see fig. 2, the definition of the pin of each network port can be referred to as follows: the POE specification is met, with

idle pins

4, 5 and 7, 8 carrying power (e.g., 48V power), and pin 1, pin 2 and pin 3, pin 6 carrying ethernet signals. Pin 1, pin 2 or pin 3, pin 6 are multiplexed to transmit the analog video signal after differential conversion, wherein the network port can adopt a standard RJ45 interface for network cable connection.

As mentioned in the above embodiments, in the prior art, a separate adapter is used to supply power to the front end of the digital hard disk recorder (i.e., the connected camera). That is, the digital hard disk recorder transmits video signals and power by using a coaxial cable, and although the project is simple, the front-end and rear-end devices are expensive. And the power supply scheme of POC (namely, coaxial power supply) has no standard specification, and all brands are completely incompatible and cannot be popularized. In this embodiment, the first network port further includes a second pin, where the second pin is configured to receive a power signal for supplying power to the camera, that is, the camera may be supplied with power through the second pin, that is, the front-end device may be exposed through the pin (or called idle pin) of the first network port, that is, standard POE power supply may be implemented. Therefore, the twisted pair is adopted to replace the coaxial line to transmit the video signal, and meanwhile, the idle twisted pair is utilized to transmit the power supply, so that the scheme cost is reduced, and the construction engineering is simplified. And moreover, a standard POE power supply technology is adopted, so that the compatibility is good, and the POE power supply device can be widely popularized. Optionally, in this embodiment, a Power Sourcing Equipment (PSE) controller meeting the ieee802.3at/af standard may be used to supply Power to the front-end camera through a twisted pair to perform Power-legal device (PD) detection, Power classification, over-current detection, Power on and Power off, etc., as shown in fig. 3, a block diagram of the Power supply module shown in fig. 3 includes a camera side circuit (in this embodiment, a video recorder side circuit is taken as an example) and an IPC or CVI side circuit, where the video recorder side circuit includes an isolated Power supply, the PSE controller and a network port, the video recorder side circuit may be externally connected to an adapter (the 48V adapter in fig. 3 is merely an example, and may also be connected to an adapter of another specification, that is, to an adapter of another voltage magnitude in practical application), the IPC or CVI side circuit includes another network port, rectifier and isolated power supply, it should be noted that the specification of each module in fig. 3 is only an example, and modules with other specifications may be adopted in practical application. The connection relationship between the modules can be seen in fig. 3.

In an alternative embodiment, the CPU includes: a first logic operation module, configured to read a status value of the AD (e.g., read a value of a first predetermined bit in a first register of the AD) after the AD is connected to the first interface and the PHY is disconnected from the first interface; determining the type of the camera as an analog camera when the state value of the AD is determined to be a first predetermined value. For example, the 4 th bit CHX _ free _ run of VIDEO _ STATUS _ REGISTER _1_ CHX can be read through the IIC bus (the REGISTER is only an example, and in practical applications, other types of REGISTERs can be used to realize similar functions), the bit being 1 indicates that no VIDEO signal or non-standard signal is input, the bit being 0 indicates that a VIDEO signal has been detected, and when the VIDEO signal is determined to be detected, the type of the VIDEO camera is determined to be an analog VIDEO camera.

In an alternative embodiment, the CPU includes: a second logic operation module, configured to read a status value of the PHY (e.g., read a value of a second predetermined bit in a second register of the PHY) after the AD is disconnected from the first interface and the PHY is connected to the first interface; and when the state value of the PHY is determined to be a second preset value, determining that the type of the camera is a network camera. For example, the 2 nd bit Link Status of the BMSR can be read through the MDIO bus from the register of the PHY RTL8211F (the register is merely an example, and in practical applications, other types of registers can be used to implement similar functions), where the bit 1 indicates Linked, the bit 0 indicates unlinked, and in the Linked state, the type of the camera is determined to be a network video recorder.

In an optional embodiment, the hard disk recorder further includes: the first switch is connected with the AD and the first interface and used for controlling the connection and disconnection of the AD and the first interface; and the second switch is connected with the PHY and the first interface and is used for controlling the connection and disconnection of the PHY and the first interface. Alternatively, the first switch may be an analog switch, and the second switch may be an analog switch, each analog switch being configured to switch a signal path. In this embodiment, the CPU may control the analog switch to switch the video signal path, and read the states of the AD and the PHY to determine whether the currently accessed analog camera or the network camera is used for the purpose of adaptation, and a specific adaptation process may be referred to as a related flow of fig. 6 described later.

In an optional embodiment, the hard disk recorder further includes: a video signal level conversion module, wherein the input port of the AD is connected to the first interface through the video signal level conversion module; an isolation transformer, wherein the input port of the PHY is connected to the first interface through the isolation transformer. In this embodiment, the video signal level conversion module may be included in the hard disk recorder, and optionally, the video signal level conversion module may also be an external module, that is, an external module independent from the hard disk recorder. The video signal level conversion module is used for converting the differential analog video signal into a single-ended analog video signal, converting the single-ended analog video signal into a differential video signal and transmitting the differential video signal through a standard network cable; the isolation transformer is used for realizing isolation and coupling of signals and improving the protection capability of the interface.

In an alternative embodiment, the video signal level conversion module comprises a balun, wherein the balun may be a three-port device or a wideband rf transmission line transformer that enables connection between a balanced transmission line circuit and an unbalanced transmission line circuit by converting a matched input (e.g., "single-ended video signal" in fig. 4) to a differential output (e.g., "differential video signal" in fig. 4). The structure of the video signal level conversion module can be seen in fig. 4, L is a common mode inductor, a resistor R is an impedance matching adjusting resistor, a TVS tube is a surge protection device, and the connection relationship among the modules can be seen in fig. 4.

In an optional embodiment, the hard disk recorder further includes: a power module, wherein the power module is connected to the first interface, and the power module is configured to supply power to the camera through the first interface. The specific structure of the power supply module can be seen in fig. 3.

In the embodiment of the invention, the hard disk video recorder and the video camera can be two devices independent from each other or can be integrated, and for the latter, the video camera can be included in the hard disk video recorder. In an optional embodiment, the hard disk recorder further includes: the camera comprises a second interface, the second interface is connected with the first interface through a network cable, the first interface comprises a first network port, and the second interface comprises a second network port.

In an optional embodiment, the input port of the AD is configured to receive a first analog video stream of the camera from the first interface if the type of the camera is determined to be an analog camera, and the output port of the AD is configured to transmit the first digital video stream to the CPU after the AD converts the first analog video stream into a first digital video stream; the input port of the PHY is configured to receive a second digital video stream of the camera from the first interface when it is determined that the type of the camera is a digital camera, and the output port of the PHY is configured to transmit the second digital video stream to the CPU. In this embodiment, the PHY can only recognize standard network digital signals, and if an analog video signal is input, the PHY will not respond, and the CPU will not read the register value change related to the PHY.

The present invention will be described with reference to the following embodiments:

fig. 5 is a schematic block diagram of the adaptive hard disk recorder according to the present invention, as shown in fig. 5, the adaptive hard disk recorder mainly comprises a CPU, an audio/video AD, a video signal level conversion module, an ethernet PHY, an isolation transformer, an analog switch, a network port, etc., wherein, in the hard disk recorder end circuit shown in fig. 5, the CPU may be connected to the PHY through an RGMII bus and an MDIO bus, the CPU may be connected to the AD through a bt.656 bus and an I2C bus, RX represents a receiving fiber, and TX represents a sending fiber; in the IPC or CVI side circuit, the PHU (or DA) may be connected to the network port through an isolation transformer (video signal conversion module).

The specific functions of each part can be referred to the description of the previous embodiments.

Fig. 6 is a self-adaptive process of the analog video recorder and the network video recorder according to the present invention, which is described below by taking the structure in fig. 5 as an example, and includes the following steps:

step 1, controlling a module switch 1 to be turned on, and controlling a module switch 2 to be turned off;

step 2, reading the state register of the AD for n times at intervals of m seconds, judging whether video signal input is detected, and turning to step 3 under the condition that the video signal input is detected in the judgment result, otherwise, turning to step 4;

step 3, determining that an analog camera is accessed currently, keeping the module switch 1 on, and turning off the analog switch 2, and turning to the step 2;

step 4, controlling the module switch 1 to be closed and the module switch 2 to be opened;

step 5, reading the state register of the PHY for n times at intervals of m seconds, judging whether a linked state is detected, and if the judgment result is that the linked state is detected, turning to step 6, otherwise, turning to step 1;

and 6, determining that the network camera is accessed currently, keeping the module switch 1 closed, and turning on the module switch 2, and turning to the step 5.

Through the embodiment, the following beneficial effects can be achieved:

the embodiment of the utility model provides an in the hard disk video recorder that describes adopt standard net gape and net twine transmission video and power, have the cost advantage, still have convenient to use nature advantage.

The embodiment of the utility model provides an in the hard disk video recorder that describes adopt standard POE power supply technology, compatible good, can be with strong points of universality.

The embodiment of the utility model provides an in the description hard disk video recorder can compatible DVR and NVR technique simultaneously for POE net gape both can support the analog camera, can support the IP camera again, can complete self-adaptation, and convenience of customers uses.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and optionally they may be implemented by program code executable by a computing device, such that they may be stored in a memory device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that shown or described herein, or separately fabricated as individual integrated circuit modules, or multiple ones of them fabricated as a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hard disk video recorder, comprising:

the CPU is in communication connection with an audio/video analog-to-digital conversion (AD) and an Ethernet port physical layer (PHY), and is used for determining the type of a camera currently accessed to a first interface according to the states of the AD and the PHY;

the AD, wherein an input port of the AD is connected with the first interface;

the PHY, wherein an input port of the PHY is connected to the first interface;

the first interface, wherein the first interface is configured to connect with the camera for receiving a video stream of the camera.

2. The video hard disk recorder according to claim 1, wherein the first interface comprises a first portal, wherein the first portal comprises a first pin configured to receive a video stream of the camera.

3. The video hard disk recorder according to claim 2, wherein the first port further comprises a second pin, wherein the second pin is configured to receive a power signal for powering the camera.

4. The hard disk recorder according to claim 1, wherein the CPU comprises:

the first logic operation module is used for reading the state value of the AD after the AD is connected with the first interface and the PHY is disconnected with the first interface; determining the type of the camera as an analog camera when the state value of the AD is determined to be a first predetermined value.

5. The hard disk recorder according to claim 1 or 4, wherein the CPU comprises:

the second logic operation module is used for reading the state value of the PHY after the AD is disconnected with the first interface and the PHY is connected with the first interface; and when the state value of the PHY is determined to be a second preset value, determining that the type of the camera is a network video recorder.

6. The hard disk video recorder according to any one of claims 1 to 4, further comprising:

the first switch is connected with the AD and the first interface and used for controlling the connection and disconnection of the AD and the first interface;

and the second switch is connected with the PHY and the first interface and is used for controlling the connection and disconnection of the PHY and the first interface.

7. The hard disk video recorder as set forth in claim 5, wherein the hard disk video recorder further comprises:

8. The hard disk video recorder of claim 1, wherein the hard disk video recorder further comprises:

a video signal level conversion module, wherein the input port of the AD is connected to the first interface through the video signal level conversion module;

an isolation transformer, wherein the input port of the PHY is connected to the first interface through the isolation transformer.

9. The video hard disk recorder according to claim 8, wherein the video signal level conversion module comprises a balun.

10. The hard disk video recorder of claim 1, wherein the hard disk video recorder further comprises:

a power module, wherein the power module is connected to the first interface, and the power module is configured to supply power to the camera through the first interface.

11. The hard disk video recorder of claim 1, wherein the hard disk video recorder further comprises:

the camera comprises a second interface, the second interface is connected with the first interface through a network cable, the first interface comprises a first network port, and the second interface comprises a second network port.