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tv   [untitled]  BELARUSTV  April 28, 2023 5:05pm-5:25pm MSK

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on sentences, yes, and in general, most often we reach for them mechanically, because we are so used to this device. but if it were not for the work of his scientists, or rather them in our lives. my name is ekaterina beretskaya. hello and let's get started. without a telephone, there would be no weiss and we would recognize it. what new products are offered to consumers by global manufacturers today. and where did we study the sound from the inside of the headphones, together with the scientist , the headphones would not have appeared if the telephone had not been invented first in the history of the issue, i propose to figure it out right now. 1875 alexander was patenting a new telephone device for that time immediately after that, scientists invent many accessories for it, in particular, the frenchman had the birth of this
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invention in 1891 around. at the same time, an english company installs microphones in concert halls and offers its subscribers to listen through headphones two decades after the appearance of the american radio engineer notaniel baldwin, literally in the kitchen, assembling his own version of headphones with good sound quality. this invention the americans stand. in this year with the discovery of the so-called dynamic loudspeaker, the part in which the electrical signal is converted. in sound quality , the sound quality becomes cleaner and better thanks to what was created for this purpose in germany in 1937, but these headphones still had a drawback. they transmitted sound, only in mono format, that is, it came through one channel, except for it was necessary to listen to the recording from two microphones through mono headphones , this did not work, therefore, i had to invent my own cossos model became
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revolutionary and it is still being produced the first popular model in 1968. it is worth noting that, despite all the convenience of the invention, listening to music, while it was possible only through a tape recorder, or by connecting headphones to music, where you want somewhere in 1995, manufacturers began to use a noise system under pressure, invented back in the seventies of the last century by the americans by lobster bows, who worked thanks to the bluetooth system from the little-known bluettake company, from that moment on, firms began to produce a variety of products over the years, both in price and in technical characteristics of headphone models about which headphones manufacturers are ready to offer today and which model is better to choose , my colleagues will tell right now. advice immediately set off two
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large groups of wired and wireless. you can also select in-ear headphones and overhead headphones overhead can be both wired and non-wired and wireless. it all depends on what you want the buyer, and manufacturers are ready to offer it in a variety of variations. if you want to definitely have a microphone, if you want to buy headphones in order to listen to music to play sports, then, of course, it is better to consider a wireless beach, as for what kind of sound you want to get, the sound quality, of course, on-ear headphones better, but at the same time they are more overall, again, if you want to use them in this regard, wireless headphones, which earbuds they more attractive. as for the in-ear headphones, they, of course, win in terms of convenience, but the sound quality of the headphones is from the sound range from
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the manufacturer. in any case, when buying, it is best for you to listen to them in order to determine the sound quality that suits you and, based on this , already decide whether to buy them or not . this applies, of course, to bends that are inserted only into a computer. there are also headphones that have a 3.5mm jack. jack which is inserted into mobile phones. their. you can also use headphones and still remain simple wired for mobile phones. how to go on a trip they do not pack their bags, but earn tips, answering tricky questions. so, as always, three tips in exchange for three projects. no
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little sparrow bird, right? yes, their mission. not just to tell about the secrets and legends of the area, but to check them personally . for example, 20 km from pinsk. and here i am in order to find the royal well. so it seems that there is still some kind of open door and immersion in the color of a separate belarusian city. on tv channel belarus 24 and how do you get that the knife of this chair is illusory much more than four, do we need it or not? perhaps this is the emotional step that is being taken from us for lies and fakes, be
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careful with pronouns and prepositions and remember that politics is very difficult. but it's very interesting. i am categorically glad that we are now forcing 24. we have already studied the sound price of these characteristics. and here you also thought about what, if you speak with a simple language, the wrong side of the headphones, do not rush to look for the answer on the internet, how modern headphones work. hello ekaterina, the question is very interesting with the prototype of the headphones, oddly enough, the battle is a completely simple device. if we blow here, the pipe will make a sound that will turn out to be that
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it perceives and amplifies, concentrates the sounds that are around and that is how the horn was arranged to increase the slime time 1880s. approximately was created the phone. the signal coming on the phone was listened to with the help of a special auditory tube called headphones, and it remained in this form until telephone exchanges appeared 10 years later. due to the active development of headphones already in our understanding. it consisted of a box. c as the most interesting, er, naturally, the first earphone that was created? uh, shouted all the ideas that came back in our time, well, his system consisted. it’s from the spring that this system
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was developed specifically for telephone operators, they needed to hear a signal that comes and uh, does not hear what is happening around, because on mishin, namely , as the element that reproduced the sound. e, the piezoelectric element or piezo was working. crystal. e, what is it? this is, let's say, a plate that has an electrical effect, which consists in the fact that if a plus or minus voltage is applied to it, two voltages swept in the other direction, that is , it works like a reproducing membrane with enough e, good data at that time and allowing . devices and would have remained as at the beginning of the last century, a specialized device for telephones appeared what is called a dynamic earpiece, namely, namely, the reproducing heart of this
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device was an electromagnetic coil, which was attached to the membrane and a signal was given here. such a headphone device made it possible to repeatedly increase the moss to hear a person. an engineering leap in the development of headphones is considered to be the moment when they switched from a spring with a chin to a spring, but in the sixties headphones appeared in a series. naturally, everything does not stand still in the already e, the seventies, the first appeared tried on signal transmission using an infrared emitter. namely, with us. well, let's denote conditionally were headphones. at the top
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was a photo booth that was being distributed. light infrared invisible light at a distance of up to 50 m. and this allows a little later, the first headphones appeared, which already transmitted a signal using radio and operated at a frequency of 900 mhz. this system was made because 900 mhz was a military radio frequency, the military hacked it all. well, naturally changed the frequency and all these headphones, of course, were expensive and uncomfortable. that is, here the protocol is defined for the frequency. the radio wave transmits the signal digitally, that is, without loss and without noise, it is i of the headphones, which at first from ordinary headphones , which are put on the ears with a spring that presses , they turned into embedded headphones, protected
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and their quality grew every day, approximately in brief of the history and device of the headphones that are now available. everyone has at least one in their pocket. and we continue. and here's more oh what we will tell next. in transport on the street and at work, it harms the laryngologist personally, let's figure it out. what questions help to solve medical headphones and find out. in what situations is it better to leave a modern device in your pocket. they went against established views and found themselves speaking. i'm retiring. it would be desirable so here, i already leave or faster basically. a question. eh, i'm still a museum, that is, my task is not to collect for myself. uh, a proper museum contrary to all
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prejudices. now their work is appreciated and in demand when they hear these thoughts they have just anyone. who. well, who is he, like, if you didn’t have a bicycle as a child. and now you still didn't have bicycles. here i am people. eh, as if returning to the time when they valued the road, see the tv channel, belarus but this is only at first glance. a kiss along yakub kolas street , show yourself a year ago along this street and a show of young mentor konstantin mikhailovich mitskevich, in addition to amazing facts from the history of polissya villages, i was small,
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but about five or six years ago i pulled out this pike said bring home. i was afraid that she would bite me her fibers after the atmosphere of a wonderful land, you will certainly want to feel personally that i love my village because i was born in it because i grew up my mary, it is immortal and our polissya this is my love, my pride, watch on belarus 24 tv channel. according to recent studies, more than 50% of people in developed countries use headphones. they are mostly teenagers and young people aged 12 to 35. moreover, many of them are a list of questions about is it safe
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the use of headphones, but as we have already seen more than once science, and in this case, a number of doctors conducted hundreds of studies, and the results of which we are now victoria valerievna good afternoon. good morning. glad to see you. mutually in order to conduct a dialogue on headphones at all. yes, let's first figure out how safe or still , well, on the internet for sure and some authors claim that not everything is as good as it seems at first glance. the use of headphones is regulated by standards, not only by the worldwide organization, which regulate the safe use of headphones, a maximum of 45 hours a week is recommended to listen to no more than 5 hours a day. that is, if these are all the volumes of the device and it is recommended to use the sound intensity up to 80 db maximum. and let me talk about headphones that help people.
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