Perakaman dan pengeluaran semula bunyi: Perbezaan antara semakan
Kandungan dihapus Kandungan ditambah
Baris 15:
Walaupun ketika itu tidak terdapat kelajuan yang diterima sejagat, dengan berbagai-bagai syarikat menawarkan cakera yang dimain pada kelajuan yang berbeza-beza, syarikat-syarikat perakaman yang utama kemudian memilih piawai industri ''[[de facto]]'' 78 pusingan seminit yang memberikan format cakera itu [[nama samaran]] sebagai "tujuh puluh lapan".
==Perakaman elektrik==
Sound recording began as a mechanical process and remained so until the 1920s, when a string of groundbreaking inventions in the field of [[electronics]] revolutionised sound recording and the young recording industry. These included sound transducers such as [[microphones]] and [[loudspeakers]], recording devices such as the [[tape recorder]] and various electronic devices such as the [[mixing desk]], designed for the [[amplification]] and modification of electrical sound signals.
After the Edison phonograph itself, arguably the most significant advances in sound recording were the electronic systems invented by two American scientists between 1900 and 1920.
In 1906 [[Lee De Forest]] invented the "Audion" [[triode]] vacuum-tube electronic valve, which could greatly amplify weak electrical signals, and this device became the basis of all subsequent electronic sound systems until the invention of the [[transistor]]. This was quickly followed by the invention of the [[Regenerative circuit]], [[Super-Regenerative circuit]] and the [[Superheterodyne receiver]] circuit, all of which were invented and patented by the young electronics genius [[Edwin Armstrong]] between 1914 and 1922.
Armstrong's inventions made high-fidelity electrical sound recording and reproduction a practical reality, facilitating the development of the electronic [[amplifier]] and many other devices; by the early 1930s these systems had become standard in the recording and radio industry. Armstrong's groundbreaking inventions also made possible the [[broadcasting]] of long-range, high-quality [[radio]] transmissions of voice and music. The importance of Armstong's Superheterodyne circuit cannot be under-estimated -- it was the central component of almost all analog amplification and radio-frequency [[transmitter]] and [[receiver]] devices of the 20th century.
==Lihat juga==
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