On cable at home everyone would like to do without. They are usually not only ugly, but can also develop into stumbling blocks. And in a living room equipped with home cinema equipment, they take over: Blu-ray players, satellite receivers and record players are connected to the AV receiver by cable. In turn, the picture sends via HDMI to the TV, which is hanging on the wall, or across the room to the projector. In addition, loudspeaker cables run not only to the comparatively close-up front speakers, but also to the rear speakers, which often provide surround sound on the other end of the living room. Finally there is the LAN cable for the connection to the home network, which leads along the wall to the router in the workroom. But all these strippers are not mandatory – apart from the cables for the current, for which no real alternative has yet been found.
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Network cables can be most easily discarded. Because hardly a router builds today only a cable-bound home network. Nearly every device is also wireless. And if the TV, player or AV receiver is not equipped with a WLAN module, the deficiency can be easily remedied.
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Many manufacturers offer as optional accessories USB dongles for the price of 50 euros and more, which upgrade the wireless access to the home network. If these dongles are too expensive or do not exist for your product: There are LAN-to-WLAN adapters, which can be used universally. These small boxes connect via LAN cable to the networkable device and wireless to the router.
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Faster and farther
Picture by radio
In order to stream high resolution films from the Internet or from the computer to the home network, sufficient bandwidth must be available for transport. Therefore, it is important that the router and the network-capable device support the WLAN-n standard. This means that today you can reach with TV, Player & Co. gross data rates of up to 450 Mbit / s. If the router is too far away or if there are massive walls in between, the reception may suffer significantly. In this case, for example, WLAN range extenders such as the AVM FRITZ! WLAN Repeater 300E help this device itself to the networkable device and relays the signals via LAN or WLAN to the router. However, optimal transmission rates can only be achieved with WLAN extenders.
An alternative is Powerline: This technique sends network data via the power line. Although there are still cables from the Powerline adapter in the socket to the device necessary. For this reason, with adapters with a transmission rate of 200 Mbit / s, sufficient reserves are available to stream HD video to remote rooms.
But in some cases you do not only want to access the videos, photos and music that are on the computer in your home network. Perhaps the TV should be used as a screen of the computer
With the HDMI WLAN adapter Auvisio PC2TV 720p, any TV with HDMI input receives this function. The small black box receives not only the picture and sound information from the computer. It also has a USB interface that allows you to connect a mouse or keyboard to work on the computer.
The solutions from Philips and Auvisio rely on the existing network infrastructure. Other technologies build their own connections. The user connects a USB stick to his PC, for example, which sends the picture information to the receiver.
The two-part wireless solution Asus WAVI goes a different way: The transmitter picks up its picture signals via HDMI from the computer and sends them over the air to the receiver. USB mouse and keyboard can also be connected here.
Many users also want to save the HDMI cable between AV receivers and TVs or beamer, since often longer distances have to be bridged. The solutions for this problem are similar to Asus WAVI: A station fetches the signal via HDMI from the source, in this case the AV receiver, and transmits it to the receiver, which delivers the sound and picture information via HDMI to the TV set .
In some televisions and projectors, the receiver is evenly installed. For example, Z1 series televisions from Panasonic and Sony ZX5 series have an integrated radio module. Both manufacturers have, however, abandoned the wireless transmission of HDMI signals on their current TV models. Epson uses EH-TW900W and EH-TW6000W receivers in the current generation of devices to receive high-definition image signals in HD quality.
Regardless of whether it is a wireless transmission from the computer or the radio connection from the AV receiver to the TV set, two technologies are used. The differences are, in particular, the maximum data rate and range
Music flies through the air
Active speakers and subwoofers are easier to rob their audio cables. Only a packet with transmitter and receiver is required, which transmits audio information through the air. For optimum sound quality, you should pay attention that the signals are digital and not the same as for the FM radio. The 2.4 GHz band is often used for digital transmission. It is also decisive whether the audio signals for the transmission are compressed and how well the digital-to-analog converter operates in the receiving unit. The Audio Pro Living WF100 convinced us.
In addition to the mostly integrated receiver module, a separate radio transmitter is a separate transmitter that can be positioned close to the source (such as preamplifier, TV, player or AV receiver). The transmitter usually receives analogue audio signals via RCA jacks or jacks.
Perfectly camouflaged
In addition to speakers, headphones can also be sounded wirelessly. Many spark solutions have a separate transmitter, which can be connected to the headphone output of the device. In the case of radio headphones that use Bluetooth, often no external transmitter is necessary, since the Bluetooth antennas are usually on board with the sound suppliers. They are often found in laptops, tablets or smartphones.
These Bluetooth products can not only be used with radio headphones. Pickups are also docking stations, as you know for iPhone, iPod and iPad. Even compact Bluetooth speakers like the Bose SoundLink are ideal for the road.
Although all of these products use the Bluetooth profile A2DP (Advanced Audio Distribution Profile), there is a great difference in the quality of the audio transmission. The minimum requirement for A2DP-enabled devices is that they support the low-complexity subcode code SBC (low-complexity subband codec), which in some cases provides worse sound results than MP3 with a bit rate of 128 Kbit / s. In compact, mobile solutions, this may be sufficient; in the living room the demanding listener wants more. It should allow the source (such as a smartphone) and the sink (such as a docking station) to allow the transmission of codecs such as MP3, AAC, or aptX
Apple's solution for the wireless transmission of music from iPod, iPhone, iPad and the computer software iTunes to the AV system is called AirPlay and uses the WLAN. The user does not have to worry about high-quality audio transmission, because the lossless Apple Lossless audio codec is used. It's easy to use, as usual with Apple: the user selects a piece of music and specifies which AirPlay product to play on the network. This can be a wireless speaker, an AV receiver, a hi-fi system or a docking station. In order to stream picture and sound via AirPlay to the TV, Apple TV helps: The in-house multimedia box connects to the TV via HDMI
If you do not see the Apple trailer, you can send videos, photos and music through the wireless network via the UPnP (Universal Plug and Play) or DLNA (Digital Living Network Alliance) transmission standard. Free software is available for the computer, smartphone or tablet PC. Also more and more TV, Player, TV receiver and AVReceiver support this standard. Often, a key press is sufficient to determine which device should play a movie, a song, or a photo.
Who now clears his apartment to replace the cables with spark solutions, do not have to worry that the transmitters could interfere with each other. Although most wireless audio solutions including Bluetooth, microwaves and WLANs work in the 2.4 GHz range. Almost all products, however, automatically change the frequency when interferers are present or can be changed manually. The same applies to the 5 GHz band that shares wireless HDMI transmitters and wireless networks.
Use the base: When cables can not be avoided, the base is an ideal means of hiding stripping. And if you do not already have one, it is worth visiting the DIY store: there is a huge selection that is different in shape and appearance and meets almost every taste.
Cable ducts do not have to be ugly: if the compact boxes or the TV hang on the wall, the cables have to be led somehow to the device. Discreet white cable shafts can be found in almost every hardware store. But cable ducts can also be used in a targeted way to enhance the space, for example with the AMBIENTECH solution from in-akustik.
DIYers are in demand: cables can be hidden behind them by means of elongated wooden boards, which are fixed in a one or two centimeters distance in front of the wall. If you are skilled in crafts, you might also want to place lamps in the cable glare: for a good mood in the living room.
Use a flat cable specifically: whether it is a loudspeaker or HDMI cable: Flat versions are available in addition to the round standard versions. They are best suited to placing them under the carpet or sunken behind the wallpaper.
Specialized furniture for every purpose: TV furniture and Hi-Fi rack manufacturers such as Spectral, Schnepel or VCM offer a variety of ways to make cables invisible. The cheap solutions are already available for 100 euros. An immense selection can be found at www.monitorhalterung.de as well as the OmniMount MWFS wall shelf
To view Internet content because the TV does not have its own web portal, to track live streams in the web browser that the TV can not display through its built-in web browser because it does not support Flash videos, or because You e-mails rather from the couch in the living room than from the PC at the desk. Various solutions exist for this. Philips, for example, is adding a PC software to its current TVs to beam the TV screen to the TV over the network.
WirelessHD (WiHD) relies on maximum bandwidth and reduces the range. WiHD transmits in the 60-GHz band and is supposed to be able to transmit 10 to 28 Gbit / s according to the manufacturer. Sufficient reserves to send full HD and 3D content uncompressed through the air. Tiny antennas ensure that not only the direct incoming radio waves are processed, but also the reflections. This allows distances of up to ten meters - but only within a room, because the high-frequency radiation is shielded by walls. There should also be visual contact between transmitter and receiver. This process uses, for example, the above-mentioned Epson projectors and the Z1 series from Panasonic. WHDI (Wireless High Definition Interface) can also radiate through walls at a maximum data rate of 3 Gbit / s. However, in this case, it becomes difficult with the transmission of films in full-HD quality without interference. Within a room, however, everything should work perfectly. Because of the lower bandwidth, video and audio signals can only be transmitted in compressed form. However, the effects on the picture quality should be noticeable only to the exact viewer. WHDI works like WLAN in the 5-GHz band.
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