Which control method uses a wireless one-way interface to control a single AV device?

The correct answer is infrared, which utilizes a one-way wireless communication method to control AV devices. Infrared technology relies on line-of-sight communication, meaning that the remote control sends infrared signals to the device it is controlling. This characteristic is critical because it allows for straightforward transmission of control signals without the need for an additional connection or setup.

Infrared is commonly used in consumer electronics, such as remote controls for televisions and audio systems, making it an established and widely recognized method for device operation. The simplicity and efficacy of infrared in controlling devices directly from a distance highlight its predominant role in wireless control setups.

While other technologies like Bluetooth, Wi-Fi, and RF control offer two-way communication, which allows for more complex interactions and feedback, infrared’s design focuses on straightforward command issuance without feedback from the device. This is the reason infrared is particularly suitable for scenarios where one-way control is adequate.