Telefon 3D Modeli

Prikazivanje 1-24 rezultata 96-a

Telefon je vrsta telekomunikacije koja vam omogućava da prenosite i primate emitovanje na daljinu pomoću električnih signala (koji se prenose žicama) ili radio signala.

 

istorija

Izum telefona je rezultat rada mnogih ljudi i njegovo autorstvo se ne može pripisati jednoj određenoj osobi.
The first prototype of the modern phone was patented in 1876 by the American inventor Alexander Bell. Bell’s tube served a transmission and reception of sound. It did not have a call function, and the call of the subscriber was through the handset with a whistle. The range of this device did not exceed 500 meters. For the lead in the invention of the phone, in addition to Bell, claimed about three dozen scientists, including McDonato, Edison, Gray, Dolber, Blake, Irvine, and Felker. This led to a series of litigation in the United States, which only confirmed the collective nature of the invention, recognizing the superiority of the various inventors for individual items.

In 1877 the inventor Wadow used a telegraph key to call the subscriber. In the same year, the German company Siemens and Halske began to manufacture telephone sets with two telephone tubes – one for reception, the other – for the transmission of speech.

Thomas Edison je izumio ugljični mikrofon, koji je radio gotovo nepromijenjen do 1980-a.

The history of the further phone development includes the invention of an electric microphone, which replaced the coal, loudspeaker, tone dialing, digital compression of sound, new telecommunication technologies (IP telephony, ISDN, DSL, cellular communications, DECT).

 

Non-electric “phones”

In general, the phone is a mechanism that has the ability to transmit sound over a long distance. The very first phones were mechanical devices based on sound transmission using air or other physical means, as opposed to electrical devices that based on electromagnetic signals.

Prema pismu iz Pekinškog lista, u 968-u kineski izumitelji Kung Fu-Winga izmislili su thumtsein, koji je navodno prenosio jezik kroz cijevi. Danas se koriste razgovori kroz cijevi.

Telefon sa konopcem bio je poznat i vekovima, povezujući dve dijafragme sa konopcem ili žicom koja prenosi zvuk sa jednog kraja na drugi pomoću vibracija užeta.

Najpopularniji brendovi telefona:

  • jabuka
  • Alcatel
  • Ericsson
  • Huawei
  • Kyocera
  • Lucent
  • marconi
  • motorola
  • Nokia
  • Nortel Networks
  • palmOne / Handspring
  • Samsung
  • Siemens AG
  • Sony Ericsson