What is a device that converts signals into audio and visual form called?

The term that describes a device which converts signals into audio and visual form is a receiver. Receivers are crucial in communication systems because they take incoming signals, whether they are radio, television, or other forms of data, and process those signals to produce sound or video output that can be easily understood by users.

In essence, a receiver interprets and decodes the raw signals, transforming them into formats that can be perceived by the human senses, thus connecting the technical nature of signal transmission with real-world applications. This functionality is vital for ensuring effective communication and media consumption.

While other devices such as transmitters and amplifiers play important roles in the transmission and enhancement of signals, they do not convert these signals into audio and visual formats. A speaker, on the other hand, is specifically designed to convert electrical audio signals into sound, but it does not handle visual data. Therefore, a receiver stands out as the correct answer in this context.