What is the process of impressing intelligence upon a carrier frequency called?

The process of impressing intelligence upon a carrier frequency is known as modulation. In telecommunications, modulation is crucial because it allows information (such as voice, data, or video) to be transmitted effectively over distances. By varying the properties of the carrier wave, such as its amplitude, frequency, or phase, modulation encodes the information onto the carrier signal. This makes it suitable for transmission through various mediums, such as air or cables, allowing the signal to travel without significant loss or interference.

Detection refers to the process of receiving and recognizing the encoded signals, while transmission involves the actual sending of the modulated signals from one point to another. Demodulation is the opposite of modulation; it is the process of extracting the original information from the modulated carrier wave upon reception. Thus, modulation stands out as the correct term for the described process, embodying the transformation of information into a form suitable for transmission.