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wireless theater
The Word “wireless” today in vogue. Dispose of wire presently strive not only producers computer, but also company, releasing home movie-theatres. However introduction wireless technology in given area associate with beside problems. And even so there is prospects beside this directions!
Not secret that released “to will of” wire, which before that quietly-peacefully lay in their own bag, are in the habit of be constantly mixed up, cling for legs its owner, as well as its relative and only after forced frequentative unwired inadvertently leaves on their own place.
The Most attention usually requires the stowage of the cables for connection back acoustic systems - as a rule, such wire (the most long in all set!) is pulled from many-server amplifier through the whole room practically. And to be able to place them indoors without heavy repair, “drumming” sewer and removing the parquet, it is necessary much powerfully try.
To solve the similar problems, was imagine great ensembles of the subterfuges, for instance connection of the acoustic systems one-single cord, by turns avoiding all rows. Naturally, with standpoint of the user one long wire was more comfortable ensemble stretching in different sides from reciver “tentacles”, in which, not even hour, could get mixed up or user itself, or someone from its families. However herewith happened to to pay that that because of length of the cord grew the number a noise pickup on it, as well as adjusting the value of the delay back acoustic systems to front became less “transparent”. In the course of time appeared flat, but then and “band” wire for connection of the acoustics. The Cords in the manner of tapes, naturally, turned out to be more subject to twisting - relieved the work on their stowage and that more it is important, allowed to place in apartment without person effort - for instance, having laid under where they less were disturbed. Apropos, and quality of the sound they provided more high - to account big area sections. But, alas, flat cords turned out to be to be expensive in production and, as effect, well above usual on the price.
However, all this indeed was only “variation on given subjects”. On existing technical basis problem “waivers of wire” could be not solved in root. The Revolution has occurred only after of the system appeared on the market.
Little histories
There was invalid to consider that wireless to technologies of the transfer of the sound appeared suddenly, on nonentities. To example, in the field of professional sound equipment they are used here is already one and a half-two groups of ten of the years - an wireless vocal radiosystems (in hoi polloi radiomikes), as well as wireless of the decision of the connection instrument, basically - a electroguitars. Since during concerto on scene is usually used several mikes and guitars, producer of the equipment in obligatory order happened to to solve a problem interactions with each other multiple systems - two or three microphone and so on. The Perennial experience of the developments in given area, realizable such grande, as AKG, Sennheiser and Nady, on all law market must was be gradually realized in home sphere. So and happened. As a result appeared the new class home audio devices - an wireless earphones. The Base to their designs formed the transmitter, working at determined for it supporting frequency. Conducted him frequency range was split on several narrow bands, switching between which transmitter realized automatically - depending on level of the hindrances on given to band. The Receiver placed in earphone themselves, ate from pair(vapour)s battery or from battery, was in that place found amplifier with regulator of loudness. The Power of the transmitter allowed the system to work within one hundred metres, “overpunching” on its way practically any obstacles of the type concrete sewer and overlapping.
home theater
One of the little factor, restraining mass introduction wireless systems, was their high price, as well as partial or full abhorrence from other radiofrequency equipment. For instance, series wireless earphone Hearo companies AKG works at frequency 864 megahertzs that does problematic their spreading in many country, where frequency data are already used walkie-talkie or cellular telephones. But comfort wireless technology was is high evaluated consumer, and models run for their base earphone certain have occupied its niche on the market expensive and high-quality audio.
On like principle were constructed and the first wireless acoustic systems for functioning(working) in composition of the home movie-theatre. Their sample appeared on the market it is enough long ago, with groups of ten of the years back, and had an weak consumer characteristic. The Home movie-theatre itself cost, softly dialect, much, and for more-more acceptable price and possibility of the use in many country powerfully simplified sending system worked in radiofrequency range. The Effect this was constantly got noise pickups - in back channel now and then could play radio, but in some cases “climbed” talks on radiotelephone or walkie-talkies. Haved time to to get on the market to first experimental models home theatre with wireless by acoustics so and remained the exotic thing, being in house only several convinced enthusiast home video.
Pro and contra
The Second chance is confirmed on the market beside wireless home movie-theatre shown up with mass spreading technology wireless of the access in computer sphere. After victory procession of the new development Bluetooth (”Blue teeth” - an more original name for computer technology), for several years penetrated in all portable digital device practically, including cellular telephones, pocket/portable computers and even playing attachments, on she reasonable has called attention producers home audio. The Concept was so ingenious that some serious realignment did not take. The Base modern wireless systems has formed the transmitter with frequency in 2,4 gigahertzs and digital coding the signal. We shall Bring the scheme, on which works the home movie-theatre with wireless by connection of the acoustic systems. After arrival of the digital sound flow with the source (DVD-disk) in reciver flow is decoded, divides on channels, but further bifurcates. One part channel leaves on amplifier directly and enters on rows by traditional way - usually this channels frontal and central acoustic systems, for connection which are not required kilometers wire, but necessary para-three-tuple cord lies where they nobody does not disturb. The Other part is once again coded for provision of compactness and checking for wholeness of the signal, leaves on wireless transmitter and “on air” reaches its purposes - a receiver in active row (usually this channels back satellite), where they decoding, increase and are reproduced. Aside from most signal, in back of the row are sent and controlling commands - a value of the installed delay for making the more real spatial effect, as well as loudness of the sound, which can be exposed including by means of board DU receiver.
Alas, and this, no doubt, progressive system turned out to be not deprived defect. Most main of them became the quality of the sound - more low, than beside similar classical systems with use wire. The Main problem here lies in small width of the channel, on which is sent useful information, as well as in impossibility of his(its) increase before desired borders - because of hard reglament standard mainly, on specification which is not provided change the used frequencies in broad spectrum. The Standard Bluetooth was developed for communication mobile device, and the main stress in he was done on low power consumption Bluetooth-device and simplicity to organizations of the channel, which limiting reception capacity was installed too low. This can turn out to be more short-sighted and for standard as a whole since with modern pace of development mobile device their potential on “milling” information in the nearest future will repeatedly exceed the possibility on its transceiving that, sooner whole, will bring about need will update and standard itself. But this already task nearest future, but presently we remain only to voice the suggestions. Noiseproof factor of the protocol also turned out to be low, sooner whole, by reason of the total information “noisy” surrounding us space, which by a narrow margin overpunches not powerful Bluetooth-transmitter, constructed for functioning(working) on minimum distance in scanned centimetres. That is why more progressive is considered use in wireless system already well proved;proven to be itself in computer industry of the protocol Wi-Fi. One more variant is an using “branded” technology of the transmission within the range of 2,4 GGC.
And once again wire
Apropos, also turned out to be the invalid opinion that wireless acoustics in root solves a problem stretching to acoustic system of the cord, and rows will possible place anywhere - even carry on room during viewing the film. Naturally that for work with many-server amplifier by means of radiofrequency channel back setellite must be not passive, but active design and combine in itself receiver, amplifier, speaker and, naturally, power supply unit of the whole complex. Though at first on the market and appeared several sets of the acoustics for home movie-theatre with feeding back satellite from storage batterys, these models did not become acclimated. The Reason was obvious and natural - too small time of the functioning. Presently, average length of the film forms around two hours, and all this time back acoustic systems must give the power a minimum in 20 watts. Compare this with comsumed by power wireless earphone in the thousandth and thousand share watt, and you will understand, why impossible was easy and simply transform one in another. The Full charge battery back row ate-ate was enough on one session whereupon was needed the multisentry a charging. Certainly, this was absolutely unacceptable for mass user. So at the this moment suppressing majority wireless acoustic systems even so have a wire - a wire of the feeding though this and breaks concept itself. Alas, and this time full liberty turned out to be than-that ephemeral and in practice unattainable.
Else one problem, characteristic wireless row, is that they must be active that is to say have inwardly itself amplifier. Naturally, this circumstance superimposes the hard restrictions on size and warmout amplifier, which it is difficult to combine with very high quality. Though modern technologies digital one-bit reinforcements of the sound allow to solve this problem, but they while that as well as have not found using in serial produced model.
The Ingenious compromise can be an use wireless decisions in back row only, where, on the one hand, most sharply cost(stand)s the problem of the laying wire, but with other - not so strict requirements to quality of the sound.
Prospects of the development
However big liberty in choice of the place under home movie-theatre even so is too luscious piece to ignore wireless concept. Insofar nor were worse technical parameters of such models, are always found people, ready to donate certain share a quality for the sake of possibility to build the system in accordance to its desire, ignoring technical or home restrictions. Presently in shop is presented several variants kit home movie-theatre with wireless by acoustics, for instance, there is big choice of the models from LG, Samsung. And even such traditional lawmakers of the mode in sphere of the home movie-theatre, as Sony, Panasonic and Pioneer have considered necessary “be noted” in given niche market, having released on several like systems. Amongst decisions, available on market, possible note the home movie-theatres LG LH-SW5100W, LG DA-W6100, Samsung HT-DB390, Philips LX3750W, Sony DAV-DS1000.
Regrettably, spiral of the development wireless technology in home appliances else it is not enough “ed”. large their introduction we follow to expect only through several years, when standards will definitively be worked and in them more will not remain “bottlenecks”. So at the point developments we have the right to expect only interesting, but more half-way decisions, which, hope, are come whomever on taste. But, as is well known, in our driving onward with mad velocity world nothing do not develop so quickly, as technologies. So, be can, already in year shall wonder, as earlier we in general could use some wire!