Tuesday, January 3, 2017

Audio and video signals getting interference

Author: pakite


PAKITE 300 meter wireless hdmi video transmitter
In IP network monitoring system, between audio and video signals exist interference problems .Although the audio and video signal data in the same IP network to separate the transmission, there is no interference in theory, but in the installation should consider the location of the connection.For example the wiring distance should be with the radio transmitter, the high voltage cable and the old street lamp.
Analog camera's audio and video system integrationcan use shielded cable to prevent signal interference . Use independent transmission cable is a very necessary stepin analog monitoring system.Most of the signal interference is caused by the distance from the high voltage cable. It is recommended to use the multi audio encoder, the most critical is to ensure that the lowest line of analog signal wiring.

Monitoring system,external microphone, speaker deployment is too dense also would cause sound interference , echo occurs in the audio input and output sound cycle, in order to avoid this kind of echo, installation the microphone and loudspeaker in a reasonable position, and another method is through a special codec to eliminate echo, using digital filter to eliminate audio echoes.

The security industry focused on video management, which is helpful for security work. Video information can help managers assess the surrounding events, on the other hand, the characters in the video facial expression to achieve a visual clue. At present, audio analysis is gradually added to the video monitoring system, the most popularapplication is the visual access audio and video intercom system, in order to carry forward in the security industry, but also to broaden its scope of application.

In the market promotion of audio application does not smooth. This integrated solution does not enable users to understand the true strength. Video analysis technology can scan the situation at that time by software, it can be achieved even if it’s in the conversation. But it cannot reach the real audio scene, so the application is not popular.

It takes a period of time to change people's thoughts about audio and video integration . First, customer should knows the capabilities and limitations of audio analysis . Audio analysis can serve as an warning system, but the procedures still need to capture video, then people react quickly, VMS integrated system is capable of handling a series of problems, need a few seconds to determine whether subsequent decision.


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Monday, January 2, 2017

What is HDMI Port

HDMI Wireless
Author: pakite

HDMI (Full name: High Definition Multimedia Interface), HDMI is type of Digital Audio/Video Connection Jack, it’s for transmission digital AV Signal , HDMI could transmission audio and video at the same times, The maximum data transmission speed is 5Gbps. And it’s no need to convert Digital to Analog or Analog to Digital signal before transmission. HDMI also support HDCP(High -bandwidth Digital Content Protection) to prevent unauthorized copying of copyrighted audio and video content. The extra space available in HDMI can be used in future audio and video formats. And because a 1080p video and an 8-channel audio signal needs less than 4Gbps, so there is a lot of storage . This allows it to connect the DVD player, receiver and PRR with a single cable.

HDMI advantages

HDMI not only meet the resolution of 1080P, but also supports DVD Audio and other digital audio formats, support for eight-channel 96kHz or 192kHz stereo digital audio transmission. HDMI support EDID, DDC2B, so HDMI devices support "plug and play", between the source and the display will automatically "negotiate", automatically select the most appropriate video / audio formats. Compared with DVI , HDMI interface with smaller size, DVI cable length can not exceed 8 meters, otherwise it will affect the picture quality, and HDMI can be transmitted up to 15 meters. As long as an HDMI cable, you can replace up to 13 analog transmission lines, can effectively solve the home entertainment system behind the connection tangled problem.

HDMI development

HDMI Licensing, LLC released HDMI Specification Version 1.4a on March 4, 2010, featuring key enhancements to 3D applications on behalf of HDMI Original Developers,  the inclusion of mandatory 3D formats for broadcast content, and the  Top-and -Bottom's 3D format. As the "HDMI 1.4" no clear boundaries , can not display the specific support of the device technology, so in this specification completely ban the use of "HDMI version 1.4" of this version number identification method. According to the new version of the "Trademarks and Logo Usage Guidelines", HDMI cable manufacturers prohibit the use of version numbers when selling and promoting HDMI version 1.4 cables. Older cables should be removed within one year from all versions identified by the version number Labels, instructions, packaging and so on.


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Saturday, December 31, 2016

300 meter HDMI wireless video transmitter

Author: pakite


PAKITE wireless hdmi transmitter 300m
With time goes by, HDMI jack has full in the market, so market develop HDMI Jack wireless video transmitter(known as wireless tv sender).

HDMI Jack wireless video transceiver means it is not Full HD resolution, PAKITE New model HDMI wireless video transmitter is 720x576p resolution. Ful HDMI video transmitter cost is much high than SDI, and it's transmission range is too short( about 10 meter at open space), so many of clients would not choose Full HDMI video transceiver.

PAKITE new model is keeping the long range transmission range( about 300 meter at open space for transmit the HDMI signal); support one transmitter and many receiver( full HD wireless video transceiver do not support like that); new model support IR Remote control at television end.


Finally but most important is the full HDMI video transmitter is very expensive, for end user may cost about 200-300usd per sets or more expensive. As for PAKITE Brand HDMI jack wireless video transmitter for sample only cost around 80usd. 720X576P also meed people’s daily requirements if not for professional device.


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