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Their shortcomings became evident in 1923 when Lee DeForest applied it to televisions. The concept of the superheterodyne receiver was discovered by two different people beginning in the mid-1920s, followed by the invention of vacuum tubes in 1926. These were soon applied to radio receivers, where in 1930 they were used to discover the first frequency modulation. And again in 1932 the invention of the loudspeaker allowed the radio receiver's output to be concentrated.
Lossiev became the first to apply the heterodyne principle, and this led to the development of the superheterodyne receiver, a receiver capable of a considerably higher sensitivity. The invention of the superheterodyne receiver gave the radio receiver not only a much wider bandwidth, but also the actual ability to do what is known as broadband amplification, which was not possible with earlier types of radio receivers. A CVT (contrast variable transmitter) is a type of variable radio transmitter, in which the audio frequency signal is modulated to a very high carrier frequency, which can be amplitude-modulated from the audio signal.[13]
In 1920, the company the British Thomson-Houston Company (BTH) was the world's largest manufacturer of magnetrons. In 1928, they invented the crystal detector. This was the forerunner of today's superheterodyne radio receivers, used in transistors, automobiles and practically everything else except for military radios.[13][14] In 1929, by producing silicon diodes at a high enough voltage to gain amplification, the vacuum tube receiver began to replace the crystal as the dominant technology in radio receivers. Development of the superheterodyne receiver had started by the end of the 1920s, and mass production of the first transistor radios started in the 1930s. Around 1946, the superheterodyne receiver reached the point of nowhere because of the invention of the integrated circuit (IC).[13][14] By the end of the 1940s, consumer transistor radios... d2c66b5586