Sinyal (elektronika)

Sinyal atau isyarat dalam bidang teknik listrik adalah besaran elektrik terukur yang berubah dalam waktu dan atau dalam ruang, serta membawa informasi. Besaran ini bisa merupakan besaran elektrik murni (tegangan, arus, dan lain lain), tetapi pada umumnya adalah besaran fisik lain yang dijadikan elektrik dengan bantuan pengindra.

Contoh isyarat elektrik, di antaranya:

  • Isyarat suara, yang berasal dari radio.
  • Isyarat citra, yang berasal dari kamera fotografi.
  • Isyarat video, yang berasal dari kamera video.

Bidang ilmu rekayasa seperti teknik listrik telah memberi jalan pada perancangan, pembelajaran, dan penerapan sistem yang meliputi pemancaran data, peranti penyimpanan data, dan manipulasi informasi. Pada pertengahan akhir abad ke-20, teknik listrik sendiri dipisahkan menjadi beberapa bidang ilmu, mengkhususkan pada perancangan dan analisis sistem yang mengubah sinyal fisik; teknik listrik dan teknik komputer sebagai contohnya.

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