- Microphones: Microphones are devices that convert sound waves into electrical signals. They can be used to record sounds at frequencies up to 20 kHz, which is the upper limit of human hearing.
- Ultrasound transducers: Ultrasound transducers are devices that convert electrical signals into sound waves. They can be used to generate and detect sounds at frequencies above 20 kHz.
- Digital oscilloscopes: Digital oscilloscopes are electronic instruments that can measure and display electrical signals. They can be used to record high frequency signals by sampling the signal at a high rate and storing the data in memory.
- Spectrum analyzers: Spectrum analyzers are electronic instruments that can measure the frequency spectrum of an electrical signal. They can be used to identify and analyze high frequency signals.
- Radar systems: Radar systems are electronic systems that use radio waves to detect and locate objects. They can be used to detect high frequency signals reflected off of objects.