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Some manufacturers use proprietary spread-spectrum techniques, enabling typical operational ranges of up to 80 metres (260 ft) in-building. It is not uncommon for several Wi-Fi networks to be within range of a typical home and as such, spread-spectrum based video senders are often the best solution for transmitting audio and video signals within this crowded wireless environment. Within the video sender market, these techniques allow for a wireless signal to be transmitted with much less chance of interference from, and to, local Wi-Fi networks. Spread-spectrum techniques are methods by which a signal is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth. Rear views of a spread-spectrum transmitter and receiver.
TRANSMIT AUDIO WIRELESSLY 720P
ASK/OOK schemes such as RC5 and RC6 work best over the RF link as the receiver uses a data slicer and AGC designed for ASK/OOK with Manchester encoding.Īnalogue wireless video senders can achieve typical operating distances of up to 60 metres (200 ft) (clear line of sight) with DVD quality (720x576) video resolution and stereo audio.ĭigital video senders are quickly becoming the most popular solution and combine the use of a system on chip (used for audio and video encoding/ decoding) with a means of transmitting the signal, such as spread-spectrum, Wi-Fi and ultra-wideband.Įarly digital video sender models typically transmitted in DVD quality, but more recent models are capable of achieving 720p and 1080p high-definition resolutions. The reverse remote control channel is usually fixed at 433.92 MHz, using whatever modulation is on the 34 kHz to 45 kHz IR remote "carrier".
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These different channels can often be used to overcome the adverse effects of nearby WiFi networks. Usually there are four FM transmit channels, A, B, C & D, with stereo audio on 6.0 MHz and 6.5 MHz FM subcarriers added to the composite video baseband. To avoid this, some video senders now use a spread-spectrum technology and can co-exist with wireless networks and share available bandwidth. More information can be found in the article on electromagnetic interference at 2.4 GHz. They do, however, have the adverse effect of causing reduced bandwidth to local Wi-Fi networks and, in some cases, Wi-Fi networks can cause picture interference on the video sender signal. The remote control relay permits infrared remote controls to operate the equipment whose output is being transmitted.Īs connectivity standards have changed in the television and audio-video markets, so it has in the video sender market, with older models usually featuring SCART and/or composite video and newer models featuring HDMI as their key means of connection to host equipment.Īnalogue video senders have the advantage of low manufacturing costs as the audio and video signals are simply modulated onto a carrier at 2.4 GHz or 5.8 GHz. The transmitter is responsible for transmitting or broadcasting a connected audio-video device, while the receiver outputs that transmitted audio-video signal to a connected television. Most video sender systems will consist of three separate components, a transmitter, a receiver and a remote control relay (also known as a magic eye or IR blaster). Typical video sender applications include the transmission of television audio and video signals from a lounge to a bedroom or from a CCTV camera to a display, as well as interconnecting appliances with audio, video and IP (Internet Protocol) requirements. 5.1 Transmitting via radio within a home.Other, less common, technologies also exist, such as those that use existing Ethernet networks. It is most commonly used for sending the output of a source device, such as a satellite television decoder, to a television in another part of a property and provides an alternative to cable installations.Ī wide range of video sender technologies exist, including analogue wireless ( radio), digital wireless ( spread-spectrum, Wi-Fi, ultra-wideband) and digital wired ( power-line communication). JSTOR ( August 2021) ( Learn how and when to remove this template message)Ī video sender (also known as a DigiSender, wireless video sender, AV sender or audio-video sender) is a device for transmitting domestic audio and video signals wirelessly from one location to another.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources.