Question

What is the process in which electronic signals are converted into coded, audible signals and can then be transmitted by radio or telephone to a receiver with a decoder at the hospital?

1) Telecommunication
2) Encoding
3) Modulation
4) Decoding

Answer 1

Option 3). The process described is known as modulation, where properties of a carrier wave are altered to encode information for transmission. This enables various forms of communication, including radio, television, and cell phones, to send clear and efficient signals that can be decoded and converted back at the receiver's end into the original message.

Step-by-step explanation:

Modulation is the act of converting electronic impulses into coded audio signals that can be broadcast over the phone or radio to a receiver that has a decoder. To encode the information, the carrier waves' amplitude, frequency, or phase must be changed during conversion and transmission. For example, in FM (frequency modulation) radio, the carrier wave's frequency is altered in accordance with the audio signal, whereas in AM (amplitude modulation) radio transmission, the carrier wave's amplitude is modified to correspond with the original audio signal. In order to replicate the original music or message, receivers take up these modulated signals and decode them.

Cell phone conversations, television voice, video images, and computer data are often sent as digital data, where the information is represented by a binary sequence of ones and zeros for robust and efficient transmission. This allows for the use of compression algorithms and enables clearer data transmission over long distances or in conditions with weak signal strength. At the receiving end, the encoded data is processed, converted back into its original format, and delivered as an audible signal or visual image.